Peifang Wang

Hohai University, Nan-ching, Jiangsu, China

Are you Peifang Wang?

Claim your profile

Publications (114)308.27 Total impact

  • Peifang Wang · Ning Qi · Yanhui Ao · Jun Hou · Chao Wang · Jin Qian
    [Show abstract] [Hide abstract]
    ABSTRACT: The behavior of photoactive TiO2 nanoparticles in an aquatic environment under UV irradiation was investigated. When there was no UV light irradiation, the attachment of humic acid (HA) onto the TiO2 nanoparticles improved their stability due to an increase in the electrostatic and steric repulsions between the particles. However, our study demonstrated that UV light clearly influenced the aggregation of TiO2 nanoparticles. Half an hour of UV irradiation caused the particles to aggregate from 331.0 nm to 1505.0 nm at a pH of 3.0. Similarly, the particles aggregated from 533.2 nm to 1037.0 nm at a pH of 6.5 and from 319.0 nm to 930.0 nm at a pH of 9.0. The aggregation continued with increased irradiation time, except for the condition at pH 3.0, which demonstrated disaggregation. Furthermore, we determined that the photocatalytic degradation of the HA dominated the behavior of TiO2 in our study. From the results of HA removal and 3DEEM fluorescence spectra data for the solution, a change in the HA was in accordance with the size change of the TiO2. The results illustrated that the UV irradiation affected the behavior of light-active nanomaterial (such as TiO2) in an aquatic system, thus influencing their bioavailability and reactivity.
    No preview · Article · May 2016 · Environmental Pollution
  • Peifang Wang · Di Wu · Yanhui Ao · Chao Wang · Jun Hou
    [Show abstract] [Hide abstract]
    ABSTRACT: ZnO nanorod arrays (NRAs) co-loaded with Au nanoparticles (NPs) and reduced graphene oxide (RGO) are fabricated using a simple one-step electrochemical deposition method. The obtained photocatalysts were characterized by field emission scanning electron microscopy, X-ray diffractometer, photoluminescence and UV-vis absorption spectra. The photocatalytic activity of the as-prepared samples was investigated by degradation of methylene blue under visible light irradiation. The results showed that Au/RGO-ZnO NRAs exhibited much higher photocatalytic activity than RGO-ZnO NRAs, Au-ZnO NRAs and pure ZnO NRAs. The synergistic effect of Au NPs and RGO enhances visible light absorption range and transmits the hot electrons more efficiently. This research will encourage more rational design of efficient visible light responsive photocatalysts.
    No preview · Article · Mar 2016 · Colloids and Surfaces A Physicochemical and Engineering Aspects
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Zinc oxide nanoparticles (ZnO NPs) used in consumer products are largely released into the environment through the wastewater stream. The health hazard of ZnO NPs and the contribution of dissolved Zn(2+) in toxicity of ZnO NPs has attracted extensive worldwide attention. In this study, the toxic effects of ZnO nanoparticles (ZnO NPs) and the effects of dissolved Zn(2+) on fluvial biofilms were investigated. At the end of the exposure time (21days), scanning electron microscopy (SEM) images and bioaccumulation experiments revealed that large quantities of ZnO NPs were adsorbed on the biofilm. The algal biomasses were significantly decreased by six- and eleven-fold compared with the control (1.43μg/L) by exposure to concentrations of 100mg/L ZnO NPs and 7.85mg/L Zn(2+), respectively. Moreover, under the same exposure conditions, the quantum yields presented contents of 53.33 and 33.33% relative to the control, and a shift in the community composition that manifested as a strong reduction in diatoms was observed from 7days and reached 15.63 and 6.25% of the control after 21days of exposure, respectively. The reductions in bacteria viability and reactive oxygen species (ROS) production were noticeably enhanced following exposure to 100mg/L ZnO NPs and 7.85mg/L Zn(2+), respectively. Additionally, the acute and rapid toxicity of Zn(2+) and the increasing toxicity of the ZnO NPs with increased bioaccumulation were noted in the exposure experiment.
    Full-text · Article · Feb 2016 · Science of The Total Environment
  • Peifang Wang · Ning Qi · Yanhui Ao · Chao Wang · Zhiyuan Wang
    [Show abstract] [Hide abstract]
    ABSTRACT: The influence of photoactive nano-TiO2 on metal behavior in the presence of humic acid (HA) in aqueous system was investigated. Our study showed that the attachment of HA onto nano-TiO2 enhanced the adsorption ability for Cd(II). The functional groups of HA could then coordinate with Cd(II), thus enhanced Cd(II) adsorption. We found that Cd(II) adsorption by HA-TiO2 followed pseudo-second-order kinetics. The FTIR spectra confirmed that Cd(II) adsorption was mainly ascribed to the presence of hydroxyl groups and polysaccharides/polysaccharide-like substances. The hydrogen-binding mechanism therefore accounted for the observations relating to the combination of HA and nano-TiO2 in our study. Solar light irradiation was found to weaken Cd(II) adsorption because of the photoactive properties of titania. The photoactive TiO2 in the aqueous system induced the degradation of the adsorbed HA, thus decreased the functional groups for the complexation of Cd(II). The results illustrated that the presence of photoactive nanomaterials (such as TiO2) would change the bioavailability of heavy metals in aquatic environments under solar irradiation.
    No preview · Article · Jan 2016 · Desalination and water treatment
  • Source
    Peifang Wang · Yayun Yin · Yong Guo · Chao Wang
    [Show abstract] [Hide abstract]
    ABSTRACT: Experimental and theoretical studies have been first time performed to investigate the adsorption of atrazine as well as the competitive adsorption of atrazine and chlorpyrifos in the mixed solution by wheat straw-derived biochar (WS750). The adsorption behavior of atrazine by WS750 follows pseudo-second-order and Freundlich models. The driving force for atrazine adsorption is л…л interaction. The surface area of atrazine is about 56.2 Å2, which is smaller than that (86.1 Å2) of chlorpyrifos. This can explain well why WS750 has higher adsorption quantity (0.0556mmol/g) for atrazine than that for chlorpyrifos (0.0537mmol/g). The mixed adsorption result suggests that WS750 prefers to adsorb chlorpyrifos with respect to atrazine (0.0530mmol/g vs 0.036mmol/g), which is due to that the interaction energy between chlorpyrifos and WS750 is larger than that between atrazine and WS750 (23.68 kcal/mol vs 22.70 kcal/mol). This work is helpful to deep understand the adsorption mechanism of more than one pollutant in waste water.
    Full-text · Article · Jan 2016 · RSC Advances
  • Muhan Cao · Peifang Wang · Yanhui Ao · Chao Wang · Jun Hou · Jin Qian
    [Show abstract] [Hide abstract]
    ABSTRACT: In this study, magnetic graphene oxide-loaded Ce-doped titania (MGO-Ce-TiO2) hybridized composite was prepared by a facile method. The as-prepared samples exhibited good adsorption capacity, high visible-light photoactive and magnetic separability as a novel photocatalyst in the degradation of tetracyclines (TC). The intermediate products and photocatalytic route of TC were proposed based on the analysis results of LC-MS. Moreover, the repeatability of the photoactivity with the use of MGO-Ce-TiO2 was investigated in the multi-round experiments with the assistance of an applied magnetic field. Therefore, the prepared composite photocatalysts were considered as a kind of promising photocatalyst in a suspension reaction system, in which they can offer effectively recovery ability. The effect of MGO content on the photocatalytic performance was also studied, and an optimum content was obtained.
    No preview · Article · Jan 2016 · Journal of Colloid and Interface Science
  • Source
    Lingzhan Miao · Chao Wang · Jun Hou · Peifang Wang · Yanhui Ao · Yi Li · Bowen Lv · Yi Xu · Guoxiang You
    [Show abstract] [Hide abstract]
    ABSTRACT: The extracellular polymeric substances (EPS) extracted from waste-activated sludge (WAS) were used as a novel biosorbent. The goal of this study was to quantify the contribution of EPS to copper immobilization by WAS. Through comparison of copper sorption using sludge with tightly bound EPS (TB-EPS) and sludge with minimal EPS, we demonstrated that TB-EPS from WAS contributed significantly to copper sorption, especially at low initial Cu2+ concentrations. EPS probably became pseudo-saturated in terms of binding sites for copper sorption at high Cu2+ concentrations; thus, cells may play a more dominant role. To quantify the relative contributions of copper sorption by EPS fractions, loosely bound EPS (LB-EPS) and TB-EPS were isolated from WAS and used in batch biosorption experiments. The results showed that TB-EPS exhibited a higher sorption capacity than LB-EPS in any pH solution applied in this study (3–6.5), due to a higher amount of functional groups (carboxylic groups) of TB-EPS. Scanning electron microscopy observation revealed that TB-EPS had a rough surface with long chains, making it more available for copper binding. Fourier transform infrared analysis further confirmed that the functional groups responsible for Cu2+ biosorption primarily consisted of hydroxyl (–OH), carboxyl (–COOH), and amide (N–H). The functional groups with weaker affinity in EPS may play a more significant role in copper removal from the aqueous phase at high copper concentrations.
    Full-text · Article · Nov 2015 · Desalination and water treatment
  • Source
    Lingxiao Ren · Peifang Wang · Chao Wang · Zhicheng Peng · Bin Hu · Ruizhe Wang
    [Show abstract] [Hide abstract]
    ABSTRACT: Understanding phosphorus (P) cycling is essential to reducing algal blooms and other negative effects in water. However, few studies have investigated the contributions of alkaline phosphatase (APase) or alkaline phosphatase activity (APA) to P cycling in natural riparian zones. Here, seasonal and spatial development of plankton, P fractions, APA fractions, and fluorescence labeled enzyme activity were investigated in a natural riparian zone in the main diversion channel for water transfer into Lake Taihu. Plankton greatly benefited from APase, and APA production was their important advantage for P acquisition and proliferation. Fluorescence labeling varied greatly between species and seasons, indicating different adaptive strategies for dissolved organic P acquisition. Phytoplankton experienced severe P stress when they were the main APA producers in spring and summer, but bacteria were superior P competitors. During autumn and winter, free APA dominated, phytoplankton APA (phyt-APA) deceased because of low biomass or high dissolved reactive P (DRP) and bacterial APA (bact-APA) proportions were high. Bulk APA and DRP were negatively correlated for the entire data-set and during the productive seasons. Significant negative correlation was observed between phyt-APA and DRP in the lacustrine and wetland zones, but the situation was complicated for bact-APA, probably owing to organic carbon limitation.
    Full-text · Article · Nov 2015 · Desalination and water treatment
  • Yi Li · Wei Xiong · Wenlong Zhang · Chao Wang · Peifang Wang
    [Show abstract] [Hide abstract]
    ABSTRACT: To alleviate the water shortage in northern China, the Chinese government launched the world's largest water diversion project, the South-to-North Water Diversion Project (SNWDP), which delivers water from water-sufficient southern China to water-deficient northern China. However, an up-to-date study has not been conducted to determine whether the project is a favorable option to augment the water supply from an environmental perspective. The life cycle assessment (LCA) methodology integrated with a freshwater withdrawal category (FWI) was adopted to compare water supply alternatives in the water-receiving areas of the SNWDP, i.e., water diversion, wastewater reclamation and seawater desalination. Beijing, Tianjin, Jinan and Qingdao were studied as representative cities because they are the primary water-receiving areas of the SNWDP. The results revealed that the operation phase played the dominant role in all but one of the life cycle impact categories considered and contributed to more than 70% of their scores. For Beijing and Tianjin, receiving water through the SNWDP is the most sustainable option to augment the water supply. The result can be drawn in all of the water-receiving areas of the middle route of the SNWDP. For Jinan and Qingdao, the most sustainable option is the wastewater reclamation system. The seawater desalination system obtains the highest score of the standard impact indicators in all of the study areas, whereas it is the most favorable water supply option when considering the freshwater withdrawal impact. Although the most sustainable water supply alternative was recommended through an LCA analysis, multi-water resources should be integrated into the region's water supply from the perspective of water sustainability. The results of this study provide a useful recommendation on the management of water resources for China.
    No preview · Article · Nov 2015 · Water Research
  • [Show abstract] [Hide abstract]
    ABSTRACT: To deeply understand the effects of hydrodynamics on microbial community, the roles of niche-based and neutral processes must be considered in a mathematical model. To this end, a two-dimensional model combining mechanisms of immigration, dispersal, and niche differentiation was firstly established to describe the effects of hydrodynamics on bacterial communities within fluvial biofilms. Deterministic factors of the model were identified via the calculation of Spearman's rank correlation coefficients between parameters of hydrodynamics and bacterial community. It was found that turbulent kinetic energy and turbulent intensity were considered as a set of reasonable predictors of community composition, whereas flow velocity and turbulent intensity can be combined together to predict biofilm bacterial biomass. According to the modelling result, bacterial community could get its favorable assembly condition with flow velocity ranging from 0.041 to 0.061 m/s. However, the driving force for biofilm community assembly changed with the local hydrodynamics. Individuals reproduction within biofilm was the main driving force with flow velocity less than 0.05 m/s, while cells migration played a much more important role with velocity larger than 0.05 m/s. The developed model could be considered as a useful tool for improving the technologies of water environment protection and remediation.
    No preview · Article · Oct 2015 · Environmental Science & Technology
  • [Show abstract] [Hide abstract]
    ABSTRACT: To safely and effectively apply artemisinin sustained-release granules to control and prevent algal water-blooms, the effects of artemisinin and its sustained-release granules on freshwater alga (Scenedesmus obliquus (S. obliquus) and Microcystis aeruginosa (M. aeruginosa)), as well as the production and release of microcystins (MCs) were studied. The results showed that artemisinin sustained-release granules inhibited the growth of M. aeruginosa (above 95 % IR) and S. obliquus (about 90 % IR), with M. aeruginosa more sensitive. The artemisinin sustained-release granules had a longer inhibition effect on growth of pure algae and algal coexistence than direct artemisinin dosing. The artemisinin sustained-release granules could decrease the production and release of algal toxins due to the continued stress of artemisinin released from artemisinin sustained-release granules. There was no increase in the total amount of MC-LR in the algal cell culture medium.
    No preview · Article · Oct 2015 · Environmental Science and Pollution Research
  • Peifang Wang · Tengfei Wu · Yanhui Ao · Chao Wang · Jun Hou · Jin Qian · Yi Li
    [Show abstract] [Hide abstract]
    ABSTRACT: AgBr/Ag2CO3 heterojunctions were synthesized via a simple one-pot co-precipitation process. Namely, the growth of Ag2CO3 and AgBr crystals occurred simultaneously in one single process. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of as-prepared samples was investigated by degradation of Rhodamine B (RhB) under visible light irradiation. An enhancement in photocatalytic activity was observed in AgBr/Ag2CO3 composites compared with pure AgBr and Ag2CO3. We also investigated the effect of the ratio of AgBr/Ag2CO3 on the photocatalytic activity of the as-prepared heterojunctions. With the optimal theoretical Br-/CO32- molar ratio of 1:2, the sample exhibits the highest photocatalytic activity.
    No preview · Article · Oct 2015
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Stability of engineered nanoparticles in aquatic environment is an essential parameter to evaluate their fate, bioavailability, and potential toxic effects toward living organisms. As CuO NPs enter the wastewater systems, they will encounter extracellular polymeric substances (EPS) from microbial community before directly interacting with bacterial cells. EPS may play an important role in affecting the stability and the toxicity of CuO NPs in aquatic environment. In this study, the influences of flocculent sludge-derived EPS, as well as model protein (BSA) and natural polysaccharides (alginate) on the dissolution kinetics and colloidal stability of CuO NPs were investigated. Results showed that the presence of NOMs strongly suppressed CuO NPs aggregation, confirmed by DLS, zeta potentials, and TEM analysis. The enhanced stability of CuO NPs in the presence of EPS and alginate were attributed to the electrostatic combined with steric repulsion, while the steric-hindrance effect may be the predominant mechanism retarding nano-CuO aggregation for BSA. Higher degrees of copper release were achieved with the increasing concentrations of NOMs. EPS are more effective than alginate and BSA in releasing copper, probably due to the abundant functional groups and the excellent metal-binding capacity. The ratio of free-Cu2+/total dissolved Cu significantly decreased in the presence of EPS, indicating that EPS may affect the speciation and Cu bioavailability in aqueous environment. These results may be important for assessing the fate and transport behaviors of CuO NPs in the environment as well as for setting up usage regulation and treatment strategy. Graphical Abstract
    Full-text · Article · Oct 2015 · Journal of Nanoparticle Research
  • Chao Wang · Yu Yao · Peifang Wang · Jun Hou · Jin Qian · Ye Yuan · Xiulei Fan
    [Show abstract] [Hide abstract]
    ABSTRACT: The precise evaluation of arsenic (As) and mercury (Hg) bioavailability in sediment is crucial to controlling As and Hg contamination, but traditional ex situ measurements hamper comprehensive analysis of labile As and Hg in sediment. In this study, we characterized in situ labile As and Hg in sediment of Lake Hongze using the zirconium (Zr) oxide diffusive gradients in thin films (DGT) technique and 3-mercaptopropyl functionalized silica gel DGT, respectively. The concentrations of DGT-labile As and Hg in the sediment profiles were found to exhibit considerable variation, ranging from 0.15 to 4.15μgL(-1) for As and from 0.04 to 1.35μgL(-1) for Hg. As and Hg flux values, calculated based on the concentration gradients measured from the DGT profiles for both the overlying water and sediment close to the sediment-water interface, were used to determine the contamination status of As and Hg. Flux values of As and Hg were between -0.066 and 0.067ngcm(-2)d(-1) and between -0.0187 and 0.0181ngcm(-2)d(-1), respectively. The GNU's Not Unix R (GNU R) programming language was used to identify outliers of As and Hg at various depths at the sampling sites. The results indicate that the sites with the most outliers were all located in the regions that were seriously affected by contaminants from the Huai River. The DGT-labile As and Hg concentrations in the 0-30mm layer were found to be significantly correlated with concentrations of labile As and Hg, total dissolved As and Hg, and total As and Hg in the overlying water, as indicated by ex situ measurements. Results show that DGT is a reliable and high-resolution technique that can be used for in situ monitoring of the labile fractions of As and Hg in sediment in fresh water bodies.
    No preview · Article · Sep 2015 · Science of The Total Environment
  • Yanhui Ao · Junling Xu · Peifang Wang · Chao Wang · Jun Hou · Jin Qian · Yi Li
    [Show abstract] [Hide abstract]
    ABSTRACT: In the present work, Bi2MoO6 nanosheets deposited TiO2 nanobelts with spatially branched hierarchical heterostructure were synthesized by a solvothermal method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectra (DRS). Results showed that depositing Bi2MoO6 nanosheets on the surface of TiO2 nanobelts boosted the efficiency of light harvesting, which can be ascribed to reduced reflection and multi-scattering because of this special 2D-1D structure. The photocatalytic activity was investigated by degradation of reactive brilliant dye X-3B (C.I. Reactive Red 2) under visible light irradiation. The results indicated that the dosage of Bi2MoO6 had a great influence on the photocatalytic activity. The enhanced activity can be ascribed to the formation of heterojunctions between Bi2MoO6 and TiO2, which can accelerate the charge transportation and separation. The enhanced activity can also be ascribed to the boosted efficiency of light harvesting. The mechanism of photocatalytic degradation of X-3B by the as obtained heterostructures was also discussed. This study may contribute to practical application of titania based heterostructures in wastewater treatment.
    No preview · Article · Sep 2015 · Colloids and Surfaces A Physicochemical and Engineering Aspects
  • Peifang Wang · Yingxue Wang · Chao Wang · Jin Qian · Jun Hou
    [Show abstract] [Hide abstract]
    ABSTRACT: Eutrophication and cyanobacterial blooms have become the most severe problems affecting the water body function of Taihu Lake. In order to understand the distribution of phytoplankton and their co-relationship with environmental factors, the phytoplankton and environmental factors were observed in different parts of Taihu Lake in the summer (July) and winter (December) of 2013. By using diversity indexes and a redundancy analysis (RDA), this study revealed that Cyanophyta, Chlorophyta and Bacillariophyta were the majority, and the main impact factors were total phosphorus (TP), total nitrogen (TN), phosphate (PO43–-P), ammonia nitrogen (NH4+-N) and dissolved oxygen (DO). During the summer, the Microcystis of Cyanophyta were the most prevalent. However, during the winter, the prevalence of all of the species and the abundance of algae decreased greatly and Bacillariophyta became dominant. The northwestern, algae-type portion of the lake had the highest abundance of Microcystis, which suffered serious eutrophication. In contrast, the eastern, grass-type portion of the lake had the lowest abundance of algae but the highest content of Bacillariophyta, indicating superior water quality. Based on the above analysis, suggestions were given to prevent and control algal blooms. In addition to decreasing the input of exogenous nutrients, sediment dredging may be performed in the northwestern portion during the winter to eliminate the blue green algae in the resting stage to some extent. Meanwhile, macrophytes should also be reconstructed in northern bays to restrain the rampant growth of phytoplankton.
    No preview · Article · Sep 2015 · Fundamental and Applied Limnology / Archiv für Hydrobiologie
  • Source
    Jun Hou · Guoxiang You · Yi Xu · Chao Wang · Peifang Wang · Lingzhan Miao · Yanhui Ao · Yi Li · Bowen Lv
    [Show abstract] [Hide abstract]
    ABSTRACT: The effects of CeO2 nanoparticles (CeO2 NPs) exposure on biological nitrogen removal in a sequencing batch biofilm reactor (SBBR) were investigated. At low concentration (1 mg/L), no significant effect was observed on total nitrogen (TN) removal. However, at high concentrations (10 and 50 mg/L), the TN removal efficiency reduced from 74.09% to 64.26% and 55.17%, respectively. Scanning electron microscope imaging showed large amounts of CeO2 NPs adsorbed on the biofilm, which increased the production of reactive oxygen species. The exposure at only 50 mg/L CeO2 NPs measurably affected the lactate dehydrogenase release. Confocal laser scanning microscopy showed that high concentrations of CeO2 NPs reduced bacterial viability. Moreover, after a short-term exposure, extracellular polymeric substances (EPS) were observed to increase, forming a compact matrix to protect the bacteria. The activities of nitrate reductase and ammonia monooxygenase were inhibited, but there was no significant impact on the activity of nitrite oxidoreductase.
    Full-text · Article · Sep 2015 · Bioresource Technology
  • Chao Wang · Zhiyuan Wang · Peifang Wang · Songhe Zhang
    [Show abstract] [Hide abstract]
    ABSTRACT: Systematic understanding of the co-effects of environmental factors on phytoplankton proliferation can enable more effective control of harmful algal blooms in eutrophic lakes and reservoirs. A batch of statistically designed experiments using response surface methodology was recently conducted on mixed algae samples collected from Changtan Reservoir. The central composite designed response surface model was established to evaluate multiple effects of various physical and chemical factors (total nitrogen, total phosphorus, temperature, and light intensity) on algal density and chlorophyll a content. Analysis of variance indicated an excellent correlation between modeling results and experimental responses. Among the selected environmental variables, promotion of the interactive effects of nitrogen and phosphorus together with the optimum total nitrogen/phosphorus mass ratio (between 7.9 and 10.1) was determined to be the most significant stimulating parameter associated with algal blooming development dominated by non-nitrogen-fixing species. The favorable effects of strong illumination were shown to be greater than those of high temperature. The border values of total nitrogen and phosphorus concentrations leading to a critical value of algal density under different water temperatures and light intensities could be predicted as nutrient loading thresholds for harmful algal blooms by our second-order polynomial regression model.
    No preview · Article · Aug 2015 · Environmental Modeling and Assessment
  • Muhan Cao · Peifang Wang · Yanhui Ao · Chao Wang · Jun Hou · Jin Qian
    [Show abstract] [Hide abstract]
    ABSTRACT: Hydrogen evolution by photocatalytic water splitting has attracted extensive attention in recent years. Here we report a composite photocatalyst, in which graphene and Pt particles act as cocatalysts to modify CdS nanowires. This composite photocatalyst was prepared by a solvothermal method followed by a photoreduction process. The obtained samples were characterized by X-ray powder diffraction, UV-vis diffuse reflectance spectroscopy, scanning and transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence and Brunauer-Emmett-Teller specific surface area analysis. The graphene and Pt comodified CdS nanowires gain a high hydrogen evolution rate of 3984 μmol h(-1) g(-1), which is almost 4 times higher than that of bare CdS nanowires and also higher than the sum of graphene-CdS and Pt-CdS nanowires. The obtained sample also exhibits a good stability. The encouraging results presented here can be attributed to the incorporation of graphene and Pt which show a synergetic effect for hydrogen evolution. This work paves a way to the potential application of CdS nanowires in energy conversion.
    No preview · Article · Aug 2015 · Dalton Transactions
  • Source
    Songhe Zhang · Ju Gu · Chao Wang · Peifang Wang · Shaojun Jiao · ZhenLi He · Bing Han
    [Show abstract] [Hide abstract]
    ABSTRACT: There is a growing concern worldwide about the prevalence of antibiotics and antibiotic resistance genes (ARGs) on the farm. In this study, we investigated the distribution of seven antibiotics and ten ARGs in fresh and dried pig feces, in biogas slurry, and in grape-planting soil from an ecological farm. Antibiotics including sulfamethazine, norfloxacin, ofloxacin, tetracycline, oxytetracycline, and chlortetracycline were detected in these samples (except for sulfamethoxazole) in dried feces. In general, antibiotics levels in samples were in the sequence: biogas slurry > fresh feces > soil or dried feces. Results of ecological risk assessments revealed that among the seven antibiotics chlortetracycline showed the highest ecological risk. Among the ten ARGs, sul I and tet O were the most prevalent on this ecological farm. There were positive correlations between certain ARGs and the corresponding antibiotics on this ecological farm. Therefore, continuous monitoring of antibiotics and their corresponding ARGs should be conducted in the agroecosystem near the concentrated animal farming operation systems.
    Full-text · Article · Aug 2015

Publication Stats

821 Citations
308.27 Total Impact Points

Institutions

  • 2007-2016
    • Hohai University
      • • College of Environment
      • • Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education
      Nan-ching, Jiangsu, China