Xie Quan

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

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Publications (357)1275.61 Total impact

  • 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.
    Journal of hazardous materials 12/2015; 299. DOI:10.1016/j.jhazmat.2015.06.005 · 4.53 Impact Factor
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    Meng Liu · Huimin Zhao · Shuo Chen · Hongtao Yu · Xie Quan
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    ABSTRACT: Novel phosphorus-doped graphitic-carbon nitride (P-C3N4) modified vertically aligned TiO2 nanotube arrays (NTs) were designed and synthesized. They can significantly enhance the conduction and utilization of photogenerated charge carriers of TiO2 NTs. The heterostructure was successfully fabricated through a three-step process: electrochemical anodization and wet-dipping followed by thermal polymerization. The prepared P-C3N4/TiO2 NTs exhibit enhanced light-absorption characteristics and improved charge separation and transfer ability, thus resulting in a 3-fold photocurrent (1.98 mA cm(-2) at 0 V vs. Ag/AgCl) compared with that of pure TiO2 NTs (0.66 mA cm(-2) at 0 V vs. Ag/AgCl) in 1 M NaOH solution. The prepared P-C3N4/TiO2 NT photoelectrodes also present excellent photocatalytic and photoelectrocatalytic capabilities in the degradation of methylene blue (MB). The kinetic rate of P-C3N4/TiO2 NTs in the photoelectrocatalytic process for MB is 2.7 times that of pristine TiO2 NTs. Furthermore, the prepared sample was used as a photoanode for solar-driven water splitting, giving a H2 evolution rate of 36.6 μmol h(-1) cm(-2) at 1.0 V vs. RHE under simulated solar light illumination. This novel structure with a rational design for a visible light response shows potential for metal free materials in photoelectrochemical applications.
    Nanoscale 09/2015; DOI:10.1039/c5nr04562b · 7.39 Impact Factor
  • Yanming Liu · Shuo Chen · Xie Quan · Hongtao Yu
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    ABSTRACT: Electrochemical reduction of CO2 is an attractive technique for reducing CO2 emission and converting it into useful chemicals, but it suffers from high overpotential, low efficiency or poor product selectivity. Here, N-doped nano-diamond/Si rod array (NDD/Si RA) was proposed as an efficient nonmetallic electrocatalyst for CO2 reduction. It preferentially and rapidly converted CO2 to acetate over formate with an onset potential of -0.36 V (vs RHE), overcoming the usual limitation of low selectivity for C2 products. Moreover, faradic efficiency of 91.2 ~ 91.8% has been achieved for CO2 reduction at -0.8 ~ -1.0 V. Its superior performance for CO2 reduction can be attributed to its high overpotential for hydrogen evolution and N doping, where N-sp3C species was highly active for CO2 reduction. Electrokinetic data and in situ infrared spectrum revealed the main pathway for CO2 reduction might be CO2 → CO2• - → (COO)2• → CH3COO-.
    Journal of the American Chemical Society 08/2015; DOI:10.1021/jacs.5b02975 · 12.11 Impact Factor
  • Yang Bai · Xie Quan · Yaobin Zhang · Shuo Chen
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    ABSTRACT: A University of Cape Town process coupled with integrated fixed biofilm and activated sludge system was modified by bypass flow strategy (BUCT-IFAS) to enhance nitrogen and phosphorus removal from the wastewater containing insufficient carbon source. This process was operated under different bypass flow ratios (λ were 0, 0.4, 0.5, 0.6 and 0.7, respectively) to investigate the effect of different operational modes on the nitrogen (N) and phosphorus (P) removal efficiency (λ = 0 was noted as common mode, other λ were noted as bypass flow mode), and optimizing the N and P removal efficiency by altering the λ. Results showed that the best total nitrogen (TN) and total phosphorus (TP) removal performances were achieved at λ of 0.6, the effluent TN and TP averaged 14.0 and 0.4 mg/L meeting discharge standard (TN < 15 mg/L, TP < 0.5 mg/L). Correspondingly, the TN and TP removal efficiencies were 70% and 94%, respectively, which were 24 and 41% higher than those at λ of 0. In addition, the denitrification and anoxic P-uptake rates were increased by 23% and 23%, respectively, compared with those at λ of 0. These results demonstrated that the BUCT-IFAS process was an attractive method for enhancing nitrogen and phosphorus removal from wastewater containing insufficient carbon source.
    Water Science & Technology 08/2015; 72(4):528. DOI:10.2166/wst.2015.242 · 1.11 Impact Factor
  • Xin Yin · Sen Qiao · Jiti Zhou · Xie Quan
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    ABSTRACT: This research was designed to investigate the effects of different electric potentials (EPs) on the anammox biomass activity in a three-electrode reactor. Electric potential difference (EPD) of 0.08V between the working and reference electrodes showed the best nitrogen removal performance. Under the optimal EPD of 0.08V, the nitrogen removal rate of reactor 2 (R2, EP applied) reached 911g-N/m(3)/d on day 188, which was 25.3% higher than that of reactor 1 (R1, the control). Moreover, the scanning electron microscope observation and extracellular polymeric substance analysis proved that EP application was conducive to the anammox cells growing onto the surface of electrode. Additionally, it was demonstrated that long-term EP application increased the crude enzymes activities and the cell quantities of the bio-electrode anammox reactor. Besides, transmission electron microscope observation proved the morphological variation of anammox biomass with continuous EP application. Copyright © 2015 Elsevier Ltd. All rights reserved.
    Bioresource Technology 07/2015; 196:376-382. DOI:10.1016/j.biortech.2015.07.096 · 4.49 Impact Factor
  • Clean Technologies and Environmental Policy 07/2015; DOI:10.1007/s10098-015-1013-y · 1.93 Impact Factor
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    ABSTRACT: Bioelectrochemical systems (BESs) have been shown to be useful in removing individual metals from solutions, but effective treatment of electroplating and mining wastewaters requires simultaneous removal of several metals in a single system. To develop multiple-reactor BESs for metals removal, biocathodes were first individually acclimated to three different metals using microbial fuel cells with Cr(VI) or Cu(II) as these metals have relatively high redox potentials, and microbial electrolysis cells for reducing Cd(II) as this metal has a more negative redox potential. The BESs were then acclimated to low concentrations of a mixture of metals, followed by more elevated concentrations. This procedure resulted in complete and selective metal reduction at rates of 1.24 ± 0.01 mg/L-h for Cr(VI), 1.07 ± 0.01 mg/L-h for Cu(II), and 0.98 ± 0.01 mg/L-h for Cd(II). These reduction rates were larger than the no adaptive controls by factors of 2.5 for Cr(VI), 2.9 for Cu(II) and 3.6 for Cd(II). This adaptive procedure produced less diverse microbial communities and changes in the microbial communities at the phylum and genus levels. These results demonstrated that bacterial communities can adaptively evolve to utilize solutions containing mixtures of metals, providing a strategy for remediating wastewaters containing Cr(VI), Cu(II) and Cd(II).
    Environmental Science & Technology 07/2015; 49(16). DOI:10.1021/acs.est.5b00191 · 5.33 Impact Factor
  • Qian Zhao · Huimin Zhao · Xie Quan · Xin He · Shuo Chen
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    ABSTRACT: Hydroxylated polybrominated diphenyl ethers (OH-PBDEs) are of great concern due to their higher toxicity compared to PBDEs. However, the abiologic process whereby PBDEs are converted to OH-PBDEs in the aquatic environment is not well understood. To explore the possibility of OH-PBDEs photoformation in natural water, the photo-hydroxylation of BDE-47 has been investigated in aqueous Fe(III) and/or fulvic acid (FA) solutions and in natural lake water under simulated solar light irradiation. The results showed that 6-OH-BDE-47 and 2'-OH-BDE-68 were generated from BDE-47 under these conditions. Based on the identification of derivatives and reactive radicals, OH-PBDEs formation can be ascribed to an addition reaction of ortho-tetra-BDE radical and hydroxyl radical (•OH), with or without a subsequent Smiles rearrangement reaction. Since the ortho-tetra-BDE radical could be readily produced by the photolysis of BDE-47, even in pure water, •OH production was considered as critical for the photoformation of OH-PBDEs. Thus, it is reasonable to deduce that the photoreactive components (Fe(III), FA) in aqueous solution played an important role through influencing •OH generation. Although the yields of OH-PBDEs did not increase regularly with increasing concentration of these photoreactive components in solution, this study suggests a possible abiotic origin of OH-PBDEs formation in the aquatic environment.
    Environmental Science & Technology 07/2015; 49(15). DOI:10.1021/acs.est.5b01240 · 5.33 Impact Factor
  • Na Lu · Yan Su · Jingyuan Li · Hongtao Yu · Xie Quan
    07/2015; DOI:10.1007/s11434-015-0841-9
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    ABSTRACT: A fluorescent assay for oxytetracycline (OTC) detection was presented based on an indirectly fluorescein-labeled aptamer probe which was fabricated through the partial hybridization of OTC long-chain aptamer with a FAM-labelled short-chain ssDNA (S1). Upon the combination of the target OTC and its aptamer, S1 with quenched fluorescein was released from the probe to the graphene sheet freely. Subsequently, it was hybridized with the complementary ssDNA (C1) and escaped from the quencher graphene to the solution resulting in the restoration of fluorescence. Benefiting from the labelling of S1 instead of the OTC aptamer directly, the restoration of fluorescence was independent of the long-chain aptamer, perfectly avoiding the negative effects of the intrinsically existed secondary structure. Together with the high affinity of aptamer for its target, this assay exhibited excellent sensitivity and selectivity. A linear response for OTC was found to be 0.01-0.2 μM with a limit of quantitation of 0.01 μM. Furthermore, the feasibility of the developed assay in fresh water system and milk sample was verified through the recovery experiments using spiked samples. This achievement based on such an indirect labelling method was also expected to lay a foundation to realize effective analysis of small molecule pollutants in the environment of which the specific aptamer were long-chain nucleotide sequences.
    RSC Advances 06/2015; 5(72). DOI:10.1039/C5RA04025F · 3.84 Impact Factor
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    ABSTRACT: Understanding the mechanism underlying controllable transmembrane transport observed in biological membranes benefits the development of new-generation separation membranes for a variety of important applications. In this work, based on common structural features of cell membranes, a very simple biomimetic membrane system exhibiting gated transmembrane performance has been constructed using all carbon nanotube (CNT)-based hollow fiber membranes. The conductive CNT membranes with hydrophobic pore channels can be positively or negatively charged and are consequently capable of regulating the transport of nanoparticles across their pore channels by "opening" or "closing" them. The switch between penetration and rejection of nanoparticles through/by CNT membranes is of high efficiency and especially allows dynamic control. The underlying mechanism responsible for the controlled transmembrane transport is that CNT pore channels with different polarities can prompt or prevent the formation of their non-covalent interactions with charged nanoparticles, resulting in their rejection or penetration by/through the CNT membranes. The theory about non-covalent interactions and charged pore channels may provide new insight into understanding the complicated ionic and bimolecular gated transport across cell membranes, and can contribute to many other important applications beyond the water purification and resource recovery demonstrated in this study.
    ACS Applied Materials & Interfaces 06/2015; 7(27). DOI:10.1021/acsami.5b01183 · 6.72 Impact Factor
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    ABSTRACT: Complete separation of Cu(II), Co(II) and Li(I) each other from aqueous mixtures is one critical step for recycling spent lithium ion batteries, and generally consumes large amount of energy and chemicals. Previous tests have primarily examined fed-batch operated self-driven microbial fuel cells (MFCs)–microbial electrolysis cells (MECs) for Cu(II) and Co(II) recovery. Mixed Cu(0) and Co(0) however, were simultaneously deposited on the MEC cathodes and Co(II) in effluents was much above water quality standard in addition to the lack of considering Li(I) species in actual wastewaters and necessarily optimizing inexpensive stainless steel (SS) as MEC cathodes for system performance. Various mesh size SS was thus explored in self-driven MFCs–MECs with different influent metal concentrations and hydraulic retention times (HRTs) under continuous flow conditions for complete separation of Cu(II), Co(II) and Li(I) each other. Mesh #60 achieved the best and complete separation of Cu(II), Co(II) and Li(I) each other with an influent metal concentration of 10 mg L−1 Cu(II), 10 mg L−1 Co(II) and 3 mg L−1 Li(I) at an HRT of 9 h. These results demonstrate mesh size of SS as MEC cathodes, HRT and influent metal concentration were critical for complete separation of Cu(II), Co(II) and Li(I) each other in self-driven MFCs–MECs under continuous flow conditions.
    Separation and Purification Technology 06/2015; 147. DOI:10.1016/j.seppur.2015.04.016 · 3.09 Impact Factor
  • Fang Yuan · Huimin Zhao · Meng Liu · Xie Quan
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    ABSTRACT: A sensitive, rapid and label-free assay for colorimetric detection of human 8-hydroxyguanine glycosylase (hOGG1) was proposed based on the tunable catalytic ability of graphene/gold nanoparticles (graphene/Au-NPs) hybrids and the terminal protection of hOGG1. In presence of H2O2, the hybrids were capable of catalyzing the oxidation of color developing reagent, causing a concomitant change in color. Due to the excellent controllability, the capacity could be inhibited by adsorption of ssDNA onto the hybrids sheets and recovered when the adsorbed ssDNA was digested by exonuclease. The terminal protection of hOGG1 could irreversibly interrupt the digestion of the captured ssDNA (containing the oxidative damage site) by the exonuclease, thus preventing the catalytic ability of graphene/Au-NPs from being recovered. The original color change which related to the concentration of the protected ssDNA facilitated quantitative detection of hOGGl activity. Compared with conventional methods for hOGG1 detection, the presented assay without any labeling process greatly simplified the operation steps and reduced the analysis time. This approach performed a linear response for hOGG1 activity from 0.02 to 0.11 U/μL with a detection limit of 0.0016 U/μL, and realized the quantification of hOGG1 activity in real cell lines.
    Biosensors & Bioelectronics 06/2015; 68. DOI:10.1016/j.bios.2014.12.048 · 6.41 Impact Factor
  • Hong Sun · Zhigang Liu · Shuo Chen · Xie Quan
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    ABSTRACT: The role of lattice oxygen on the activity and selectivity of the OMS-2 catalyst synthesized by the hydrothermal method was investigated for the catalytic oxidation of toluene. The OMS-2 catalyst exhibited excellent activity for the catalytic oxidation of toluene, but the by-product benzaldehyde was detected at low temperatures. A DRIFT study showed that the lattice oxygen was both the adsorption site and active catalytic site. The nature of the replenished surface lattice oxygen was found to influence the selectivity, and toluene that was adsorbed on the lattice oxygen replenished by gaseous oxygen could be oxidized easily into benzaldehyde. A possible reaction mechanism has been proposed that could elucidate the toluene oxidation activity over OMS-2 involving two reaction routes, either with or without gaseous oxygen.
    Chemical Engineering Journal 06/2015; 270. DOI:10.1016/j.cej.2015.02.017 · 4.32 Impact Factor
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    ABSTRACT: Direct interspecies electron transfer (DIET) between Geobacter species and Methanosaeta species is an alternative to interspecies hydrogen transfer (IHT) in anaerobic digester, which however has not been established in anaerobic sludge digestion as well as in bioelectrochemical systems yet. In this study, it was found that over 50% of methane production of an electric-anaerobic sludge digester was resulted from unknown pathway. Pyrosequencing analysis revealed that Geobacter species were significantly enriched with electrodes. Fluorescence in situ hybridization (FISH) further confirmed that the dominant Geobacter species enriched belonged to Geobacter metallireducens. Together with Methanosaeta species prevailing in the microbial communities, the direct electron exchange between Geobacter species and Methanosaeta species might be an important reason for the "unknown" increase of methane production. Conductivity of the sludge in this electric-anaerobic digester was about 30% higher than that of the sludge in a control digester without electrodes. This study not only revealed for the first time that DIET might be the important mechanism on the methanogenesis of bioelectrochemical system, but also provided a new method to enhance DIET by means of bioelectric enrichment of Geobacter species.
    Scientific Reports 06/2015; 5:11094. DOI:10.1038/srep11094 · 5.58 Impact Factor
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    ABSTRACT: Carbon nanofibers (CNFs) were prepared by electrospun polyacrylonitrile (PAN) polymer solutions followed by thermal treatment. For the first time, the influence of stabilization procedure on the structure properties of CNFs was explored to improve the adsorption capacity of CNFs towards the environmental pollutants from aqueous solution. The adsorption of three organic chemicals including ciprofloxacin (CIP), bisphenol (BPA) and 2-chlorophenol (2-CP) on electrospun CNFs with high surface area of 2326m(2)/g and micro/mesoporous structure characteristics were investigated. The adsorption affinities were compared with that of the commercial powder activated carbon (PAC). The adsorption kinetics and isotherms showed that the maximum adsorption capacities (qm) of CNFs towards the three pollutants are sequenced in the order of CIP>BPA>2-CP, which are 2.6-fold (CIP), 1.6-fold (BPA) and 1.1-fold (2-CP) increase respectively in comparison with that of PAC adsorption. It was assumed that the micro/mesoporous structure of CNFs, molecular size of the pollutants and the π electron interaction play important roles on the high adsorption capacity exhibited by CNFs. In addition, electrostatic interaction and hydrophobic interaction also contribute to the adsorption of CNFs. This study demonstrates that the electrospun CNFs are promising adsorbents for the removal of pollutants from aqueous solutions. Copyright © 2015 Elsevier Inc. All rights reserved.
    Journal of Colloid and Interface Science 06/2015; 447. DOI:10.1016/j.jcis.2015.01.042 · 3.37 Impact Factor
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    ABSTRACT: In present work, three-dimensional porous HxTiS2 nanosheet-polyaniline (PANI) nanocomposites were first synthesized by a two-step method. Firstly HxTiS2 ultrathin nanosheets were prepared by the lithium-intercalation-and-exfoliation method, followed by the surface polymerization reactions of aniline. The influences of the amount of HxTiS2 nanosheets on the nanocomposite morphology and electrochemical performances of the nanocomposites modified glass carbon electrode (HxTiS2 nanosheet-PANI/GCE) were investigated. The results demonstrated that the incorporation of HxTiS2 nanosheets as a suitable substrate can regulate the growth of PANI, enhance the electrode stability and improve interfacial electron transfer rates. In addition, based on the nanocomposites, we developed a novel electrochemical sensor to directly detect trace Cu2+, and discovered that the coordination interaction between Cu2+ and the nitrogen atoms of the imine moieties in PANI endowed the electrochemical sensor with high selectivity. Owing to the synergetic effects of HxTiS2 nanosheets and PANI, the as-prepared electrochemical sensor exhibited highly sensitive and selective assaying of Cu2+ with a detection limit of 0.7 nM (S/N=3) and a linear range from 25 nM to 5 μM under optimal conditions.
    Analytical Chemistry 05/2015; 87(11). DOI:10.1021/acs.analchem.5b00500 · 5.64 Impact Factor
  • Shuo Chen · Jinqi Yu · Hua Wang · Hongtao Yu · Xie Quan
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    ABSTRACT: A pilot-scale coupling catalytic ozonation–membrane filtration system was designed for the recirculating aquaculture wastewater treatment at a fish farm. The ceramic membranes were coated with Ti–Mn/TiO2 oxide for both catalytic ozonation and filtration. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) images showed that the Ti–Mn oxides were distributed smoothly over both the membrane surface and the inner walls of the pores. Compared with the TiO2/Al2O3 membranes, the Ti–Mn/TiO2/Al2O3 membranes exhibited better catalytic ozonation capability with enhanced membrane antifouling (a normalized permeate flux obtained after 2 h operation was 0.56) and higher removal efficiency of organic matters (52.1%). The ozone dose has an important effect on the degradation of organic matters and ammonia. At an ozone dose of 52 mg/min (stable permeate was obtained after 1 h operation), turbidity and nitrite were almost completely removed, and the concentration of total ammonia nitrogen (TAN) dropped to less than 0.1 mg/L. The permeate quality satisfied the water quality requirement for aquaculture. The recovery ratio of the aquaculture seawater was as high as 95.8%.
    Desalination 05/2015; 363. DOI:10.1016/j.desal.2014.09.006 · 3.76 Impact Factor
  • Yanming Liu · Xie Quan · Xinfei Fan · Hua Wang · Shuo Chen
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    ABSTRACT: H2 O2 production by electroreduction of O2 is an attractive alternative to the current anthraquinone process, which is highly desirable for chemical industries and environmental remediation. However, it remains a great challenge to develop cost-effective electrocatalysts for H2 O2 synthesis. Here, hierarchically porous carbon (HPC) was proposed for the electrosynthesis of H2 O2 from O2 reduction. It exhibited high activity for O2 reduction and good H2 O2 selectivity (95.0-70.2 %, most of them >90.0 % at pH 1-4 and >80.0 % at pH 7). High-yield H2 O2 generation has been achieved on HPC with H2 O2 concentrations of 222.6-62.0 mmol L(-1) (2.5 h) and corresponding H2 O2 production rates of 395.7-110.2 mmol h(-1) g(-1) at pH 1-7 and -0.5 V. Moreover, HPC was energy-efficient for H2 O2 production with current efficiency of 81.8-70.8 %. The exceptional performance of HPC for electrosynthesis of H2 O2 could be attributed to its high content of sp(3) -C and defects, large surface area and fast mass transfer. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
    Angewandte Chemie International Edition 04/2015; 54(23). DOI:10.1002/anie.201502396 · 11.26 Impact Factor

Publication Stats

6k Citations
1,275.61 Total Impact Points


  • 1998–2015
    • 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