Xie Quan

Dalian University of Technology, Lü-ta-shih, Liaoning, China

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Publications (380)1342.26 Total impact

  • Huimin Zhao · Yanping Qu · Fang Yuan · Xie Quan
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    ABSTRACT: A visible and label-free colorimetric sensor for microRNA-21 (miRNA-21) detection was developed based on the peroxidase-like activity of graphene/gold-nanoparticles (Au-NPs) hybrids which could be flexibly controlled by single-stranded PNA-21 (ssPNA-21). The spontaneous absorption of ssPNA-21 on graphene/Au-NPs hybrids surface causes the peroxidase-like catalytic activity of hybrids to be almost completely deactivated via π-π stacking interaction between ssPNA and graphene, so that TMB could not be oxidized to oxTMB in the presence of H2O2 ,leading to no color change. The addition of miRNA-21 triggered hybridization reaction between the PNA probe (ssPNA-21) and miRNA-21. The decrease of the exposed base groups could lead to the release of PNA/DNA duplexes from the hybrids surface, which would restore the catalytic activity of hybrids with a concomitant colorless-to-blue color change. As a result, this sensor emitted low background signal and responded linearly to miRNA-21 from 10 nM to 0.98 μM with a detection limit of 3.2 nM (S/N=3) under the optimal conditions. In addition, the biosensor could be also extended to miRNA-21 detection in human serum. Therefore, this colorimetric sensor platform is a potential alternative assay for miRNA detection in biomedical research.
    No preview · Article · Feb 2016 · Analytical methods
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    ABSTRACT: Requirement of NO2- presence in feed is one barrier of Anammox process for the application since NO2- is not a frequent composition in most wastewaters. In this study, anodic oxidation of NH4+ to NO2- was realized in a single-chamber bioelectrochemical system with an anodic potential of -0.5 V. The NO2- product compensated its lack in the feed to accelerate the anammox. As a result, the anammox efficiency increased by at least 29.2%. When the potential was removed, the nitrogen removal in these two reactors had no significant differences. The SEM images and FISH analysis suggested that the abundance of anammox bacteria was obviously higher in R2.
    No preview · Article · Feb 2016
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    ABSTRACT: Anaerobic digestion operated in microbial electrolysis cells (MECs) may have a higher methane production since the potential cathodic reduction of carbon dioxide. However, the complicated organic components in municipal sludge retard the sludge hydrolysis and limit the efficiency of methanogenesis. Sludge hydrolysis and its effects on methanogenesis and organic matter removal in a single-chamber MEC were investigated in this study. As compared with the control reactor without electric field, total chemical oxygen demand (TCOD) removal and methane production in MEC with applied voltage of 0.8 V increased by 26% and 28%, respectively. Energy income from the increased methane was about five folds of the electric energy supply. Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and transmission electron microscope (TEM) analysis indicated that anodic oxidation of MEC significantly improved the disintegration of sludge flocs and cell walls. Anodic Coulombic efficiency and current density further revealed that anodic oxidation coupled with cathodic reduction of carbon dioxide was the predominant mechanism in the improvement of sludge decomposition and methane production during the initial fermentation, which hereby accelerated the rate of sludge hydrolysis.
    No preview · Article · Jan 2016 · International Biodeterioration & Biodegradation
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    ABSTRACT: Z-scheme photocatalytic system shows superiority in degradation of refractory pollutants and water splitting due to the high redox capacities caused by its unique charge transfer behaviors. As a key component of Z-scheme system, the electron mediator plays an important role in charge carrier migration. According to the energy band theory, we believe the interfacial energy band bendings facilitate the electron transfer via Z-scheme mechanism when the Fermi level of electron mediator is between the Fermi levels of Photosystem II (PS II) and Photosystem I (PS I), whereas charge transfer is inhibited in other cases as energy band barriers would form at the semiconductor-metal interfaces. Here, this inference was verified by the increased hydroxyl radical generation and improved photocurrent on WO3-Cu-gC3N4 (with the desired Fermi level structure), which were not observed on either WO3-Ag-gC3N4 or WO3-Au-gC3N4. Finally, photocatalytic degradation rate of 4-nonylphenol on WO3-Cu-gC3N4 was proved to be as high as 11.6 times than that of WO3-gC3N4, further demonstrating the necessity of a suitable electron mediator in Z-scheme system. This study provides scientific basis for rational construction of Z-scheme photocatalytic system.
    No preview · Article · Jan 2016 · ACS Applied Materials & Interfaces
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    ABSTRACT: Herein, a continuous-flow-mode photocatalytic disinfection device with the capacity of 1m3/h was presented. The core reactor of the photocatalytic device was structured by installing a TiO2 (Degussa P25) coated helical support around a UV lamp into an annular reactor. This photocatalytic device exhibited superior disinfection capability to UV technology. After 2.42×106CFU/L of Escherichia coli (E. coli) suspension flowed through the photocatalytic device, 3.05log10 reduction of E. coli was removed, while only 2.57log10 reduction of E. coli was removed by UV disinfection device. The residual E. coli in the effluent decreased to only 2.16×103CFU/L for photocatalytic device, which was distinctly lower than 6.44×103CFU/L for UV disinfection process. Photocatalytic disinfection also displayed prominent ability in restraining E. coli reactivation. After 24h of preservation, concentration of E. coli in effluent for UV process was found as 1.20×104CFU/L (0.74log10 of increase), 16 times less than 1.99×105CFU/L (1.49log10 of increase) of UV process. Moreover, the photocatalytic device exhibited high endurance to flux fluctuation and E. coli concentration change. These results demonstrated an access of applying photocatalytic technology to applying for disinfection of wastewater.
    No preview · Article · Jan 2016
  • Guanlong Wang · Shuo Chen · Hongtao Yu · Xie Quan
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    ABSTRACT: Coupling membrane filtration with photocatalysis provides multifunction involving filtration and photocatalytic degradation for removing pollutants from water, but the performance of photocatalytic membrane is limited due to the quick recombination of photogenerated electron-holes in photocatalytic layer. Herein, a TiO2/carbon/Al2O3 membrane was designed and constructed through sequentially depositing graphitic carbon layer with good electro-conductivity and TiO2 nanoparticles layer with photocatalytic activity on Al2O3 membrane support. When light irradiated on the membrane with a voltage supply, the photogenerated electrons could be drained from photocatalytic layer and separated with holes efficiently, thus endowing the membrane with photoelectrocatalytic function. Membrane performance tests indicated that the photoelectrocatalytic membrane filtration (PECM) showed improved removal of natural organic matters (NOMs) and permeate flux with increasing voltage supply. For PECM process at 1.0V, its NOMs removal was 1.2 or 1.7 times higher than that of filtration with UV irradiation or filtration alone, and its stable permeate flux was 1.3 or 3 times higher than that of filtration with UV irradiation or filtration alone. Moreover, the PECM process exhibited special advantage in removing organic chemicals (e.g., Rhodamine B), which displayed 1.3 or 3 times higher removal than that of filtration with UV irradiation or filtration alone. Copyright © 2015 Elsevier B.V. All rights reserved.
    No preview · Article · Dec 2015 · Journal of hazardous materials
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    ABSTRACT: Acidogenesis is an important pretreatment process for various industrial wastewater treatments. Granular sludge is an efficient form of a microbial community in anaerobic methanogenic reactors, such as upflow anaerobic sludge blanket (UASB), but it is hard to develop in the acidogenic process due to the short hydraulic retention times (HRTs) of acidogenesis. In this study, nitrate was added into an acidogenic reactor as an electron acceptor to enhance electron exchange between acidogenic and denitrifying bacteria to accelerate sludge growth in the acidogenesis process. The results showed that it developed solid and mature granular sludge with a mean size of 410 ± 35 μm over 84 days of operation. Comparatively, the sludge in a no-nitrate acidogenic reactor showed a flocculent appearance with a mean size of 110 ± 18 μm. Analysis of the microbial community indicated that denitrifying bacteria interwoven with propionate-oxidizing bacteria were distributed in the outer granule layer, which provided an ideal shield for susceptible microorganisms inside the granules. This microbial structure was favorable for the development of granular sludge and made the system possible to respond well to shocks in the operation.
    No preview · Article · Dec 2015 · Applied Microbiology and Biotechnology
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    ABSTRACT: An ultrasensitive electrochemical sensor for Cu2+ detection was first developed based on p-aminothiophenol (PATP) anchored on the surface of Au nanoparticle-decorated hydrogen-incorporated TiS2 nanosheets (PATP/Au-HxTiS2). In the synthesis process, the plane edges of HxTiS2 nanosheets offered Au nanoparticles with incubation sites for the heterogeneous nucleation and growth. On the other hand, Au nanoparticles were not only served as an excellent electrical catalyst to facilitate electron transfer and as a substrate for loading PATP molecules by Au-S valent bonds, but also could effectively avoid the aggregation of HxTiS2 nanosheets. Due to the synergetic effects from Au-HxTiS2 for signal amplification, the as-formed electrochemical sensor exhibited highly sensitive and selective assaying of Cu2+ with a detection limit of 90 pM (3σ) and a linear range from 0.2 nM to 5 μM, under optimal conditions. Its specificity was ascribed to the strong coordination interaction between Cu2+ and N atoms of imine moieties in PATP after electrochemical oxidation.
    Full-text · Article · Dec 2015 · Electrochimica Acta
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    ABSTRACT: In this work, boron doped graphene quantum dots (BGQDs) with the atomic percentage of boron (B) of 0.67-2.26% were synthesized by electrolytic exfoliation of B doped graphene rods. X-ray photoelectron spectroscopy of BGQDs confirmed that the B atoms have been successfully incorporated into the GQDs. Characterizations by transmission electron microscopy, photoluminescence (PL) spectra and UV-visible spectra demonstrated that BGQDs had a consistent lattice spacing with the plane of graphene and possessed good luminous performance. The PL stability, the electrochemical impedance and Zeta potential test indicated that the 60 days-PL stability of BGQDs was improved by 51% and the resistance of BGQDs was decreased by 11% compared with that of the pure GQDs when 1.29% (atomic percentage) of B was doped. Electrochemiluminescence (ECL) sensing results showed that the ECL sensor with BGQDs as luminescent material exhibited an excellent analytical property for the detection of miRNA-20a in a linear range of 0.1-1×104 pM with a quantification limit of 0.1 pM. Specificity tests showed that this ECL sensor could distinguish the target miRNAs-20a with several similar bases strand. The obtained results in this study prove that the proposed ECL sensor provides a high sensitively, specifically and simply platform for detection of miRNAs-20a.
    No preview · Article · Dec 2015
  • Yang Bai · Yaobin Zhang · Xie Quan · Shuo Chen

    No preview · Article · Nov 2015 · Water Science & Technology
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    ABSTRACT: Hydroxylated polybromodiphenyl ethers (OH-PBDEs) are emerging aquatic pollutants, but their origins in the environment are not fully understood. There is evidence that OH-PBDEs are formed from bromophenols, but the underlying transformation processes remain unknown. Here we investigate if the photoformation of OH-PBDEs from 2,6-dibromophenol in aqueous solution involves 2,6-bromophenoxyl radicals. After UV irradiation of an aqueous 2,6-dibromophenol solution, HPLC-LTQ-Orbitrap MS and GC/MS analysis revealed the formation of a OH-PBDE and a dihydroxylated polybrominated biphenyl (di-OH-PBB). Both dimeric photoproducts were tentatively identified as 4'-OH-BDE73 and 4,4'-di-OH-PBB80. In addition, three debromination products (4-OH-BDE34, 4'-OH-BDE27, and 4,4'-di-OH-PBBs) were observed. Electron paramagnetic resonance spectroscopy revealed the presence of a 2,6-dibromophenoxyl radical with a six-line spectrum (aH (2 meta) = 3.45 G, aH (1 para) = 1.04 G, g = 2.0046) during irradiation of a 2,6-dibromophenol solution in water. The 2,6-dibromophenoxyl radical had a relatively long half-life (122 ± 5 μs) according to laser flash photolysis experiments. The para-para C-C and O-para-C couplings of these 2,6-dibromophenoxyl radicals are consistent with the observed formation of both dimeric OH-PBDE and di-OH-PBB photoproducts. These findings show that bromophenoxyl radical-mediated phototransformation of bromophenols is a source of OH-PBDEs and di-OH-PBBs in aqueous environments that requires further attention.
    No preview · Article · Nov 2015 · Environmental Science & Technology
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    ABSTRACT: Bioelectrochemical systems (BESs) were first operated in microbial fuel cell mode for recovering Cu(II), and then shifted to microbial electrolysis cells for Cd(II) reduction on the same cathodes of titanium sheet (TS), nickel foam (NF) or carbon cloth (CC). Cu(II) reduction was similar to all materials (4.79-4.88mg/Lh) whereas CC exhibited the best Cd(II) reduction (5.86±0.25mg/Lh) and hydrogen evolution (0.35±0.07m(3)/m(3)d), followed by TS (5.27±0.43mg/Lh and 0.15±0.02m(3)/m(3)d) and NF (4.96±0.48mg/Lh and 0.80±0.07m(3)/m(3)d). These values were higher than no copper controls by factors of 2.0 and 5.0 (TS), 4.2 and 2.0 (NF), and 1.8 and 7.0 (CC). These results demonstrated cooperative cathode electrode and in situ deposited copper for subsequent enhanced Cd(II) reduction and hydrogen production in BESs, providing an alternative approach for efficiently remediating Cu(II) and Cd(II) co-contamination with simultaneous hydrogen production.
    Full-text · Article · Nov 2015 · Bioresource Technology
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    ABSTRACT: A simple approach to high-throughput fabrication of length-unlimited, neat carbon nanotube (CNT) hollow fiber membranes based on wet-spinning technology is presented. The prepared CNT membranes exhibit uniform hollow fiber configuration, good electrical conductivity and controllable attributes (for example, thicknesses, structures and pore sizes). Specifically, the CNT hollow fiber membranes with three-dimensional macroporous structure in their cross sections can support a water flux of 12000±1500Lm-2h-1bar-1 which is 6 times higher than that of polymeric membranes with the similar pore size of about 100nm, 10 times and 2 times higher than that of commercial Al2O3 ceramic membranes (pore size of 1000nm) and polycarbonate membranes (pore size of 200nm), respectively. Experimental measurements indicate their ultrahigh porosity of 95±3% and hydrophilicity derived from H2SO4/HNO3 treatment of CNTs for well dispersion in solvent mainly account for the high permeability. Benefiting from their good electrical conductivity, the CNT membranes demonstrate the interesting electricity-induced improved selectivity (rejection ability) for nanoparticles, which is mainly attributed to the electrostatic interaction, preventing their penetrating the CNT membranes. The distinctive function of CNT membranes is highly expected to contribute to various important areas of application, such as water purification and biomolecule separation.
    No preview · Article · Nov 2015 · Journal of Membrane Science
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    ABSTRACT: Membrane filtration provides an effective solution for removing pollutants from water but is limited by serious membrane fouling. In this work, an effective approach was used to mitigate membrane fouling by integrating membrane filtration with electropolarization using an electroconductive nanocarbon-based membrane. The electropolarized membrane (EM) by alternating square-wave potentials between +1.0 V and -1.0 V with a pulse width of 60 s exhibited a permeate flux 8.1 times as high as that without electropolarization for filtering feed water containing bacteria, which confirms the ability of the EM to achieve biofouling mitigation. Moreover, the permeate flux of EM was 1.5 times as high as that without electropolarization when filtrating natural organic matter (NOM) from water, and demonstrated good performance in organic fouling mitigation with EM. Furthermore, the EM was also effective for complex fouling mitigation in filtering water containing coexisting bacteria and NOM, and presented an increased flux rate 1.9 times as high as that without electropolarization. The superior fouling mitigation performance of EM was attributed to the synergistic effects of electrostatic repulsion, electrochemical oxidation and electrokinetic behaviors. This work opens an effective avenue for membrane fouling mitigation of water-treatment membrane filtration systems.
    No preview · Article · Oct 2015 · Water Research
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    ABSTRACT: Increase of methanogenesis in methane-producing microbial electrolysis cells (MECs) is frequently believed as a result of cathodic reduction of CO2. Recent studies indicated that this electromethanogenesis only accounted for a little part of methane production during anaerobic sludge digestion. Instead, direct interspecies electron transfer (DIET) possibly plays an important role in methane production. In this study, anaerobic digestion of sludge were investigated in a single-chamber MEC reactor, a carbon-felt supplemented reactor and a common anaerobic reactor to evaluate the effects of DIET on the sludge digestion. The results showed that adding carbon felt into the reactor increased 12.9% of methane production and 17.2% of sludge reduction. Imposing a voltage on the carbon felt further improved the digestion. Current calculation showed that the cathodic reduction only contributed to 27.5% of increased methane production. Microbial analysis indicated that DIET played an important role in the anaerobic sludge digestion in the MEC.
    No preview · Article · Oct 2015 · Bioresource Technology
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    ABSTRACT: Perfluorochemicals are environmentally persistent, bioaccumulative and globally distributed contaminants, which present potential toxicity to both humans and ecosystems. However, rapid mineralization of perfluorochemicals with cost-effective method remains great challenges. Here, an electro-Fenton system was reported for efficient mineralization of perfluorooctanoate (PFOA), where H2O2 was electro-generated in-situ from O2 reduction on hierarchically porous carbon (HPC). Benefited from the high H2O2 production rate (41.2~14.0 mM/h) of HPC, PFOA (50 mg/L) was rapidly degraded by electro-Fenton with first order kinetic constants of 1.15~0.69 h-1 at low potential (-0.4 V) in a wide range of pH (2~6). Meanwhile, PFOA was effectively mineralized, as revealed by a total organic carbon removal efficiency of 90.7~70.4% (-0.4 V, pH 2~6, 4 h). Moreover, the current efficiency of this electro-Fenton system for PFOA degradation was one order of magnitude higher than those of electrochemical oxidation. Based on the intermediate analysis, a possible mechanism for PFOA degradation was proposed: PFOA lost one electron to the anode and got decarboxylated. The formed perfluoroalkyl radical was mainly oxidized by hydroxyl radical, resulting in the formation of shorter chain perfluorocarboxylic acid, which followed the same reaction cycle as PFOA until it was mineralized.
    No preview · Article · Oct 2015 · Environmental Science & Technology
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    ABSTRACT: Core/shell type carbon-coated Fe nanocapsules (Fe@C NCs) were in situ synthesized by DC arc-discharge plasma method in methane atmosphere. Such Fe nanocapsules have saturation magnetization of 29.32emu/g and specific surface area of 85.86m2/g. The carbon shell of Fe@C NCs was functionalized with oxygen-containing groups (such as –OH or –COOH) by using H2O2. The adsorption of organic dye, e.g., methylene blue (MB) was systematically investigated in different conditions, such as contact time, pH values and temperature. The maximum adsorption capacity (46.5mg/g) was calculated by fitting the adsorption isotherms with Langmuir model, coincident with the experimental result of 44.5mg/g. Kinetics data supported pseudo-second order model, and the thermodynamic process of adsorption was revealed as endothermic and spontaneous physisorption. The MB-absorbed Fe@C NCs can be entirely separated from the contaminative solution by a magnetic field and then successfully cycled for regeneration. After repetitive cycles of the adsorption/desorption experiments for five times, the removal efficiency can be maintained over 90%.
    No preview · Article · Oct 2015 · Nano brief reports and reviews
  • Hongtao Yu · Yan Gong · Shuo Chen · Xie Quan
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    ABSTRACT: A novel metal-free polyimide (PI)/g-C3N4 heterojunction has been prepared through a sonochemical approach. The PI/g-C3N4 composite exhibits an extraordinary high photogenerated carrier separation efficiency and sequentially a high-efficiency photocatalytic capability in the degradation of 2,4-dichlorophenol (2,4-DCP) under visible light irradiation. In particular, the optimum photocatalytic activity of the PI/g-C3N4 composites with weight ratio of PI at 30% is almost 3.8 times as high as that over g-C3N4. Furthermore, it was found by experimental analysis and density functional theory (DFT) calculations that the superior photocatalytic performance of the composites can be attributed to the facile band alignment and different electronic structure of g-C3N4 and PI components in the heterojunction for efficient charge separation and transfer.
    No preview · Article · Sep 2015 · RSC Advances
  • Peng Wang · Hong Sun · Xie Quan · Shuo Chen
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    ABSTRACT: The development of catalysts for selective catalytic reduction (SCR) reactions that are highly active at low temperatures and show good resistance to SO2 and H2O is still a challenge. In this study, we have designed and developed a high-performance SCR catalyst based on nano-sized ceria encapsulated inside the pores of MIL-100(Fe) that combines excellent catalytic power with a metal organic framework architecture synthesized by the impregnation method (IM). Transmission electron microscopy (TEM) revealed the encapsulation of ceria in the cavities of MIL-100(Fe). The prepared IM-CeO2/MIL-100(Fe) catalyst shows improved catalytic activity both at low temperatures and throughout a wide temperature window. The temperature window for 90% NOx conversion ranges from 196 to 300°C. X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFT) analysis indicated that the nano-sized ceria encapsulated inside MIL-100(Fe) promotes the production of chemisorbed oxygen on the catalyst surface, which greatly enhances the formation of the NO2 species responsible for fast SCR reactions.
    No preview · Article · Sep 2015 · Journal of hazardous materials
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    Meng Liu · Huimin Zhao · Shuo Chen · Hongtao Yu · Xie Quan

    Full-text · Dataset · Sep 2015

Publication Stats

8k Citations
1,342.26 Total Impact Points

Institutions

  • 1998-2016
    • Dalian University of Technology
      • • Department of Environmental Science and Technology
      • • School of Environmental and Biological Science and Technology
      Lü-ta-shih, Liaoning, China
  • 2004
    • The Hong Kong University of Science and Technology
      • Department of Chemical and Biomolecular Engineering
      Chiu-lung, Kowloon City, Hong Kong
  • 2003
    • Pohang University of Science and Technology
      • Department of Chemical Engineering
      Geijitsu, Gyeongsangbuk-do, South Korea