Xie Quan

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

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Publications (369)1323.21 Total impact

  • International Biodeterioration & Biodegradation 01/2016; 106:161-169. DOI:10.1016/j.ibiod.2015.10.020 · 2.13 Impact Factor
  • 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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    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.
    Environmental Science & Technology 11/2015; DOI:10.1021/acs.est.5b03637 · 5.33 Impact Factor
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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.
    Bioresource Technology 11/2015; 200:565-571. DOI:10.1016/j.biortech.2015.10.084 · 4.49 Impact Factor
  • Gaoliang Wei · Shuo Chen · Xinfei Fan · Xie Quan · Hongtao Yu ·
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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.
    Journal of Membrane Science 11/2015; 493:97-105. DOI:10.1016/j.memsci.2015.05.073 · 5.06 Impact Factor
  • Xinfei Fan · Huimin Zhao · Xie Quan · Yanming Liu · Shuo Chen ·
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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.
    Water Research 10/2015; 88:285-292. DOI:10.1016/j.watres.2015.10.043 · 5.53 Impact Factor
  • Zisheng Zhao · Yaobin Zhang · Xie Quan · Huimin Zhao ·
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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.
    Bioresource Technology 10/2015; 200:235-244. DOI:10.1016/j.biortech.2015.10.021 · 4.49 Impact Factor
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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.
    Environmental Science & Technology 10/2015; DOI:10.1021/acs.est.5b03147 · 5.33 Impact Factor

  • Nano brief reports and reviews 10/2015; DOI:10.1142/S1793292016500132 · 1.09 Impact Factor
  • 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.
    RSC Advances 09/2015; 5(101). DOI:10.1039/C5RA17146F · 3.84 Impact Factor
  • 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.
    Journal of hazardous materials 09/2015; 301:512-521. DOI:10.1016/j.jhazmat.2015.09.024 · 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; 7(39). 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; 137(36). 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
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    ABSTRACT: Compared with wood pulp, straw pulp and papermaking, because of lower cost and abundancy of raw material, has become an indispensable approach in paper industry of China. However, its further application is limited by huge water consumption and wastewater discharge. By employing substance flow analysis, this study built up an optimization model and a performance evaluation system of water saving for the water-use network of a straw pulp and paper enterprise, after identifying the problems in present water consumption. Accordingly, an optimization plan was proposed to combine man-made water circulation with natural water circulation system. Additionally, a contrast analysis between the present and optimized water use was conducted. At last, we applied the proposed optimization plan to one of the most important and largest enterprises of straw pulp and paper industry in China as an illustration. Theoretically, water consumption could be reduced by 75.4 % without wastewater discharge after optimization.
    Clean Technologies and Environmental Policy 07/2015; DOI:10.1007/s10098-015-1013-y · 1.93 Impact Factor
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    ABSTRACT: Silicon nanoparticles (Si NPs), silicon nanosheets (Si NSs), and silicon nanoribbons (Si NRs) were fabricated by means of DC arc-discharge under diverse atmospheres (hydrogen, mixtures of hydrogen and inert gas). It is shown that these as-prepared Si NPs are approximately 5-50 nm in diameter, Si NSs are about 10-30 nm in width and about 2.8 nm in thickness, and Si NRs consist of fine sheets with a length as long as 200 nm, width of 13 nm, and thickness of 3.1 nm. BET measurements reveal that the specific surfaces are 110.9, 108.8, and 164.2 m2 g-1 for Si NPs, Si NSs, Si NRs, respectively. Formation mechanisms for polymorphic Si nanostructures are elucidated, revealing that the anisotropic or isotropic growth of Si nanostructures is greatly induced by high energetic inert gas and hydrogen atoms, and finally results in the formation of polymorphic Si nanostructures. A visible down-shift of Raman frequency for these Si nanostructures is mainly attributed to the size effect. The band gaps are experimentally measured as 2.89 eV (Si NPs), 2.92 eV (Si NSs), and 3.02 eV (Si NRs) for direct transition, and 1.99 eV (Si NPs), 1.26 eV (Si NSs), and 1.36 eV (Si NRs) for indirect transition. These are noticeably enlarged with respect to bulk Si (1.1 eV).
    RSC Advances 07/2015; 5(84):68714-68721. DOI:10.1039/C5RA11738K · 3.84 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

Publication Stats

7k Citations
1,323.21 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