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Adsorption thermodynamics and kinetic investigation of aromatic amphoteric compounds onto different polymeric adsorbents

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Journal of Environmental Sciences 2007年第11期19卷 1298-1304页

作者： WANG Hal-ling FEI Zheng-hao CHEN Jin-long ZHANG Quan-xing XU Yan-hua College of Environment Nanjing University of Technology Nanjing 210009 China Jiangsu Provincial Key Laboratory of Coastal Wetland Bioresources and Environmental Protection Yancheng 224002 China State Key Laboratory of Pollution Control and Resources Reuse School of Environment Nanjing University Nanjing 210093 China

The adsorption behavior ofp-aminobenzoic acid and o-aminobenzoic acid onto the different polymeric adsorbents was systematically investigated as a function of the solution concentration and temperature. Experimental results indicated that the equilibrium adsorption data of the four polymeric adsorbents fitted well in the Freundlich isotherm. The adsorption capacity of multi-functional polymeric adsorbent NJ-99 was the highest, which might be attributed to the strong hydrogen-bonding interaction between the amino groups on the resin and the carboxyl group of aminobenzoic acid. The adsorption capacity of o-aminobenzoic acid onto any adsorbent was higher than p-aminobenzoic acid. Thermodynamic studies suggested the exothermic, spontaneous physical adsorption process. Adsorption kinetics results showed that the adsorption followed the pseudo-second-order kinetics model and the intraparticle mass transfer process was the rate-controlling step.

关键词： aromatic amphoteric compound aminobenzoic acid polymeric adsorbents adsorption thermodynamics kinetics

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Nitrogen-enriched micro-mesoporous carbon derived from polymers organic frameworks for high-performance capacitive deionization

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Journal of Environmental Sciences 2022年第1期34卷 282-291页

作者： Jianpei Zhang Xun-an Ning Danping Li Yi Wang Xiaojun Lai Weixuan Ou Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environment Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China School of Land Resources and Environment Key Laboratory of Agricultural Resource and Ecology in the Poyang Lake Basin of Jiangxi ProvinceJiangxi Agricultural UniversityNanchang 330045China

Nitrogenization is an effective method for improving the capacitive deionization(CDI)performance of porous carbon *** particular,polymer organic frameworks with heteroatom doping,containing an ordered pore structure and excellent electrochemical stability,are ideal precursors for carbon materials for high-performance *** this study,a nitrogen-enriched micro-mesoporous carbon(NMC)electrode was fabricated by carbonizing a Schiff base network-1 at 500,600,and 700℃.Scanning electron microscopy,Fourier transform infrared spectroscopy,X-ray diffraction,N_(2) adsorption-desorption,the contact angle of water,cyclic voltammetry,and electrochemical impedance spectroscopy were used to characterize the morphological structure,wettability,Brunauer–Emmett–Teller surface areas,and electrochemical performance of the *** results showed that the NMC carbonized at 600℃ achieved the best specific capacitance(152.33 F/g),as well as a high electrosorption capacity(25.53 mg/g)because of its chemical composition(15.57%N)and surface area(312 m^(2)/g).These findings prove that NMC is viable as an electrode material for desalination by high-performance CDI applications.

关键词： Polymers organic frameworks Nitrogen-doped carbon Micro-mesoporous Carbon Capacitive deionization

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Modified anaerobic membrane bioreactor for low-concentration wastewater treatment

Modified anaerobic membrane bioreactor for low-concentration...

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2nd International Conference on Bioinformatics and Biomedical Engineering, iCBBE 2008

作者： Lin, Ying-Zi Jun, Yin Han, Xiang-Kui School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin China Jilin Province Key Laboratory of Water Pollution Control and Resources Reuse Changchun China

ISBN: (纸本)9781424417483

In this study low-concentration wastewater was treated by the integral two-phase anaerobic baffled reactor, and the feasibility study of "two-phase anaerobic + aerobic" process was also discussed. Dehydrogenase activity of aerobic zone and anoxic zone was analyzed. Besides, the polymerase chain reaction and denaturing gradient gel electrophoresis (PCR-DGGE) method was used to analyze the microbial species diversity for both aerobic and anoxic zone. The result indicated that the low-concentration wastewater could be treated with high removal of organic matter, in which HRT was the key factor for COD removal. This research could provide reference value to the sewage plants in cold region for new process of wastewater treatment and sludge treatment. © 2008 IEEE.

关键词： Polymerase chain reaction

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B-doped lotus pollen biochar photothermal activating periodate for acetaminophen degradation by non-radical pathway: Significance of thermal effect from the photothermal process

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Separation and Purification technology 2025年

作者： Lei Qin Shuyuan Hu Huan Yi Wenjun Wang Cui Lai Shiyu Liu Dengsheng Ma Tao Tong Hao Deng Guangjie Lv College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control Hunan University Changsha 410082 PR China College of Resources and Environmental Engineering Guizhou University Guiyang 550025 PR China School of Resources and Environment Hunan University of Technology and Business Changsha 410205 PR China

Periodate (PI)-based advanced oxidation emerges as a key solution for environmental remediation. However, existing activation methods are energy-intensive, driving demand for sustainable alternatives. In this study, a photothermal activation method for PI based on B-doped lotus pollen biochar (CB500) was developed to degrade acetaminophen (ACE). In the CB500/PI photothermal activation system, ACE could be completely degraded within 15 min, which was 17.71 times faster than light activation system. Quenching experiments, electron paramagnetic resonance, and electrochemical tests proved singlet oxygen ( 1 O 2 ) was the main reactive species. Photothermal contribution analysis revealed that thermal effects predominated in the system. Besides, the system showed a high resistance to interference. Its degradation capability was almost unaffected by natural organic matter (NOM) and maintained excellent degradation performance over a wide pH range. Moreover, this system exhibited potential for ACE degradation in actual water samples. This work provides novel insights into the advancement of photothermal PI activation.

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Construction of direct-Z-scheme heterojunction photocatalyst of g-C_(3)N_(4)/Ti_(3)C_(2)/TiO_(2)composite and its degradation behavior for dyes of Rhodamine B

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Chinese Journal of Chemical Engineering 2024年第9期73卷 222-234页

作者： Hanlin Qian Jianping Zou Hongxia Liu Aishun Ma Shitong Xu Ting Li Sili Ren Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341099China Jiangxi Provincial Key Laboratory of Low-Carbon Processing and Utilization of Strategic Metal Mineral Resources Ganzhou 341099China Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China

Direct-Z-scheme g-C_(3)N_(4)/Ti_(3)C_(2)/TiO_(2)photocatalyst with giant internal electric field was prepared by onestep aqueous sonication self-assembly method using g-C_(3)N_(4)and MXene of Ti_(3)C_(2)as the source *** chemical composition and structure of the catalysts was characterized by FT-IR,XRD,SEM,TEM,and *** XPS characterization indicated that Ti_(3)C_(2)was partially oxidized to TiO_(2)during the composite *** a result,an efficient direct-Z-scheme heterojunction structure consisting of the g-C_(3)N_(4)and TiO_(2)with Ti_(3)C_(2)as an electron bridge was *** photocatalytic performance of the prepared catalysts was evaluated by degrading the Rhodamine B(RhB)*** with the single g-C_(3)N_(4),the g-C_(3)N_(4)/Ti_(3)C_(2)/TiO_(2)composite photocatalyst exhibited efficient and stable photocatalytic degradation ability,with a degradation efficiency as high as 99.2%for RhB under optimal conditions(2%Ti_(3)C_(2),pH=3).The high degradation performance of g-C_(3)N_(4)/Ti_(3)C_(2)/TiO_(2)for RhB was attributed to the combination of Ti_(3)C_(2),TiO_(2),and g-C_(3)N_(4)components,forming a direct-Z-scheme heterojunction with a high-speed electron transport channel *** role of Z-scheme heterojunctions in electron transport is verified by photoelectrochemical characterization,along with photoluminescence(PL).Our research provides a simple method to design photocatalysts by constructing direct-Z-scheme electron transport channels for highly efficient treatment of dye wastewater.

关键词： Photocatalyst Direct-Z-scheme heterojunction RhB dye wastewater g-C_(3)N_(4) MXene Ti_(3)C_(2)

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Removal of uranium(VI) by humic-reducing Bacteria 4

Removal of uranium(VI) by humic-reducing Bacteria

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4th International Conference on Chemical Engineering and Advanced Materials, CEAM 2014

作者： Li, Shi You Wei, Qing Peng Xie, Shui Bo Zeng, Tao Tao Gu, Zhong Hua Hunan Province High School Key laboratory of Pollution Control and Utilization Technology University of South China HengyangHunan China

ISBN: (纸本)9783038352693

The effective factor such as temperature, pH, AQS and the content of U(VI) were investigated in the study on removal U(VI) by humic-reducing bacteria(HRB). The analysis of FTIR showed the carboxyl, amide and phosphate groups are the main functional group to remove U(VI), and the optimal temperature is about 30C, the optimal pH is about 6.0 and the optimal content of AQS is about 1.0 mmol/L. © (2014) Trans Tech Publications, Switzerland.

关键词： Bacteria

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Partial aging can counter-intuitively couple with sulfidation to improve the reactive durability of zerovalent iron

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Frontiers of Environmental Science & Engineering 2024年第2期18卷 1-11页

作者： Yiwei Liu Kaili Gu Jinhua Zhang Jinxiang Li Jieshu Qian Jinyou Shen Xiaohong Guan Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200241China

Sulfated zero-valent iron(SZVI)has shown promising applications in wastewater ***,the rapid decline in the reactivity of SZVI with time limits its real *** mediate this problem,partial aging was proposed to improve the reactive durability of *** Cr(VI)as the target contaminant,we found that the aged ZVI(AZVI)gradually lost reactivity as aging time increased from 0.5 to 2 ***-intuitively,the partially aged SZVI(ASZVI)showed greater reactivity than SZVI when exposed to oxygenated water for a period ranging from 0.5 to 14 *** addition,the ASZVI with 0.5 d of aging time(ASZVI-0.5)not only maintained reactivity in successive runs but also increased the Cr(VI)removal capacity from 9.1 mg/g by SZVI to 19.1 mg/g by *** analysis further revealed that the electron transfer from the Fe0 core to the shell was mediated by the conductive FeS and FeS2 in the subshell of ***,the lepidocrocite and magnetite on the surface of ASZVI facilitated Cr(VI)adsorption and subsequent electron transfer for Cr(VI)***,the iron(hydr)oxide shell could retain the conductive FeS and FeS2 in the subshell,allowing ASZVI to reduce Cr(VI)efficiently and *** general,partial aging can enhance the reactive durability of ZVI when coupled with sulfidation and this synergistic effect will be beneficial to the application of SZVI-based technology for wastewater treatment.

关键词： Zerovalent iron Sulfidation Partial aging Interface reconstruction Electron transfer

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Synergistic promotion of particulate matter reduction and production performance via adjusting electrochemical reactions in the zinc electrolysis industry

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 23-33页

作者： Zizhen Ma Jingkun Jiang Lei Duan Jianguo Deng Fuyuan Xu Zehui Li Linhua Jiang Ning Duan School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266520China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of the EnvironmentTsinghua UniversityBeijing 100084China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China School of Physics Peking UniversityBeijing 100871China

Heavy particulate matter (PM) pollution and high energy consumption are the bottlenecks of hydrometallurgy, especially in the electrolysis process. Therefore, an urgent need is to explore PM reduction methods with production performance co-benefits. This study presents three PM reduction methods based on controlling operating parameters, i.e., lowering electrolyte temperature, H2SO4 concentration, and current density of the cathode. The optimized conditions were also investigated using the response surface methodology to balance the PM reduction effect and Zn production. The results showed that lowering electrolyte temperature is the most efficient, with an 89.0% reduction in the PM generation flux (GFPM). Reducing H2SO4 concentration led to the minimum side effects on the current efficiency of Zn deposition (CEZn) or power consumption (PC). With the premise of non-deteriorating CEZn and PC, GFPM can be reduced by 86.3% at the optimal condition (electrolyte temperature = 295 K, H2SO4 = 110 g/L, current density = 373 A/m^(2)). In addition, the reduction mechanism was elucidated by comprehensively analyzing bubble characteristics, electrochemical reactions, and surface tension. Results showed that lower electrolyte temperature inhibited the oxygen evolution reaction (OER) and compressed gas volume. Lower H2SO4 concentration inhibited the hydrogen evolution reaction (HER) and reduced electrolyte surface tension. Lower current density inhibited both OER and HER by decreasing the reaction current. The inhibited gas evolutions reduced the microbubbles’ number and size, thereby reducing GFPM. These results may provide energy-efficient PM reduction methods and theoretical hints of exploring cleaner PM reduction approaches for industrial electrolysis.

关键词： Zinc electrolysis Particulate matter Energy consumption Operating parameters Bubble characteristic Electrochemical reaction

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Enhanced removal of I^- on hierarchically structured layered double hydroxides by in suit growth of Cu/Cu2O

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Journal of Environmental Sciences 2020年第2期32卷 338-348页

作者： Jiuyu Chen Junyi Wang Qianhong Gao Xiaomei Zhang Ying Liu Peng Wang Yan Jiao Zongxiang Zhang Yi Yang Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC)Nanjing University of Information Science&TechnologyNanjing 210044China Jiangsu Environmental Protection Key Laboratory of Monitoring for Organic Pollutants in Soil Taizhou Environmental Monitoring CenterTaizhou 225300China

To further improve the removal ability of layered double hydroxide(LDH) for iodide(I^-) anions from wastewater, we prepared hierarchically porous Cu5Mg10Al5-LDH and used as a matrix for in suit growth of Cu/Cu2O on its surface, forming Cu/Cu2O-LDH, which was characterized and applied as an *** displayed high I^-saturation uptake capability(137.8 mg/g) of Cu/Cu2O-LDH compared with Cu5Mg10Al5-LDH(26.4 mg/g) even thermal activated LDH(76.1 mg/g).Thermodynamic analysis showed that the reaction between I^-anions and Cu/Cu2O-LDH is a spontaneous and *** kinetics analysis exhibited that adsorption equilibrium can be reached after 265 ***, the adsorbent showed satisfactory selectivity in the presence of competitive anions(e.g., SO4^2-), and could achieve good adsorption performance in a wide pH range of 3–8.A cooperative adsorption mechanism was proposed on the basis of the following two aspects:(1) ion exchange between iodide and interlayer anions;(2) the adsorption performance of Cu, Cu(Ⅱ) and Cu2O for I^-.Meanwhile, the difference between the adsorption mechanism of Cu/Cu2O-LDH, Cu5Mg10Al5-LDH and Cu5Mg10Al5-CLDH adsorbents was also elaborated and verified.

关键词： Layered double hydroxide Cu/Cu2O Iodide adsorption Hierarchical structure In suit growth

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Enhanced 4-chlorophenol biodegradation by integrating Fe_(2)O_(3)nanoparticles into an anaerobic reactor:Long-term performance and underlying mechanism

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 107-119页

作者： Cheng Hou Xinbai Jiang Na Li Zhenhua Zhang Qian Zhang Jinyou Shen Xiaodong Liu Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Biosafety Nanjing Institute of Environmental SciencesNanjing 210042China School of Life and Environmental Science Guilin University of Electronic TechnologyGuilin 541004China

Fe_(2)O_(3)nanoparticles have been reported to enhance the dechlorination performance of anaerobic systems,but the underlying mechanism has not been *** study evaluated the technical feasibility,system stability,microbial biodiversity and the underlying mechanism involved in a Fe_(2)O_(3)nanoparticle-coupled anaerobic system treating 4-chlorophenol(4-CP)*** results demonstrated that the 4-CP and total organic carbon(TOC)removal efficiencies in the Fe_(2)O_(3)-coupled up-flow anaerobic sludge blanket(UASB)were always higher than 97%and 90%during long-term operation,verifying the long-term stability of the Fe_(2)O_(3)-coupled *** 4-CP and TOC removal efficiencies in the coupled UASB increased by 42.90.4%and 27.50.7%compared to the control UASB *** Fe_(2)O_(3)nanoparticles promoted the enrichment of species involved in dechlorination,fermentation,electron transfer and acetoclastic methanogenesis,and significantly enhanced the extracellular electron transfer ability,electron transport activity and conductivity of anaerobic sludge,leading to enhanced 4-CP biodegradation performance.A possible synergistic mechanism involved in enhanced anaerobic 4-CP biodegradation by Fe_(2)O_(3)nanoparticles was proposed.

关键词： Dechlorination Fe_(2)O_(3)nanoparticles Electron transfer Microbial community

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