SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Boxuan Yang,Yuxin Zeng,Tao Guo,Yuanzhong Lin,Lifeng Yin,Qingsong Hua
Hexafluoropropylene oxide dimer acid (HFPO-DA), an emerging persistent pollutant, has been prevalently utilized as an alternative to perfluorooctanoic acid (PFOA). Analogous to PFOA, HFPO − DA presents remarkable resistance against degradation by conventional technologies. In this study, we prepared Ce doped PbO 2 anode (Ce-PbO 2 ) and paired it with cathode to form redox system for the degradation of HFPO-DA in water. The results showed that the degradation rate of HFPO-DA over Ce-PbO 2 was as high as 1.67 × 10 −2 min −1 , much higher than that of Boron-doped diamond electrode (BDD, 6.84 × 10 –3 min −1 ). The Ce-PbO 2 anode also has the theoretical lifetime as high as 82.7 years. Free radical quenching experiments indicated that both reactive oxygen species (ROS) and reductive radicals contributed to the degradation of HFPO-DA. These degradation reactions start from a direct electron transfer, followed by electroreduction and a series of free radical reactions including decarboxylation, ether bond cleavage, and the “4A” processes (generation of Alkyl radicals, Alcohols, Acyl fluorides, and Acids in sequence) until it is decomposed into small molecules. Meanwhile, new intermediates (CF 3 CF 2 CF 2 OCF 3 CH•) generated by cathodic H• are dominating the reductive reaction during the electrochemical process. This “buttering bread on both sides” redox mechanism deepens the understanding of the degradation process of HFPO-DA and provides an efficient treatment strategy.
研究领域:
环境科学
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电化学
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污染治理
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2015
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IF 3.091
Yapeng He,Weimin Huang,Rongling Chen,Wenli Zhang,Haibo Lin,Hongdong Li
The electrochemical abatement of aspirin, a representative anti-inflammatory drug, is carried out through anodic oxidation by employing PbO 2 , boron-doped diamond (BDD) and porous Ti/BDD as anodes. The effect of nature characteristic and structure of the electrode material on the electrochemical oxidation is systematic investigated. The redox behavior of aspirin on different electrodes is studied by linear sweep voltammetry. Completely mineralization of aspirin could be achieved on BDD electrodes. The results show that the electrochemical incineration of aspirin on three electrodes follows a pseudo first-order kinetics behavior with apparent rate constant of 0.051, 0.185 and 0.367 h −1 for PbO 2 , flat BDD and porous BDD electrode. Electrochemical degradation mechanism on BDD electrodes involves the direct and indirect electrochemical oxidation while there is only indirect oxidation for aspirin on PbO 2 electrode. Porous Ti/BDD presents the best excellent electrochemical oxidation ability for aspirin compared with flat BDD and PbO 2 electrode. The discrepancy of electrochemical oxidation could be explained in terms of in situ generation and utilization rate of hydroxyl radicals on the surface of electrode materials.
研究领域:
环境科学
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电化学
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药物降解
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Liping Zhang,Hexia Yuan,Yiyun An,Huitong Li,Yiqing Gao,Huaran Sun
Coking reverse osmosis concentrated water contains refractory organic pollutants . If not treated, it will generate hazardous solid waste that cannot be utilized in the subsequent evaporation and crystallization process . In order to effectively remove organic substances from coking reverse osmosis concentrated water, Ti/PbO 2 electrode, Ti/Ce,Nd-PbO 2 electrode, and Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode were prepared. The electrodes were characterized by scanning electron microscopy, X-ray diffraction spectroscopy, and X-ray photoelectron spectroscopy, revealing that the average crystal grain size of lead dioxide on the surface of the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode is 29.58 nm. The electrochemical performance of the electrodes was tested using cyclic voltammetry and electrochemical impedance spectroscopy , which showed oxidation peaks at 1.37 V, 1.81 V, and 2.1 V for the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode, with a charge transfer resistance of 56.34 Ω. Accelerated life test indicated that the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode has an accelerated lifespan of 1050 min. The effects of interelectrode distance, pH value, current density , and other factors on the electrocatalytic oxidation of 3,5-di-tert-butylphenol by the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode were investigated, achieving a removal efficiency of 98.67 % under optimal conditions. Performance analysis of the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode demonstrated good stability. Treatment of actual coking reverse osmosis concentrated water using the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode resulted in removal efficiencies of 87.76 %, 47.92 %, and 77.42 % for COD , TOC, and UV 254 , respectively. The current efficiency and energy consumption of electrocatalytic degradation of coking reverse osmosis concentrated water were 9.38 % and 0.15 kWh/g COD. This study provides a better treatment solution for the degradation of organic matter in coking reverse osmosis concentrated water.
研究领域:
环境科学
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电化学工程
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Yuanzhen He,Dengjie Zhong,Yunlan Xu,Ran Jiang,Pengfei Liao,Jiayou Zhang
In this work, Ti/SnO 2 -Sb 2 O 4 -La/β-PbO 2 electrode was successfully prepared by electrodeposition method. The surface morphology, crystal structure, elemental states and electrochemical characteristics of the electrode were examined by SEM, XRD, XPS, CV, and LSV. The results demonstrated that the conductivity, specific surface area, electrochemical oxidation performance and stability of the β-PbO 2 coated electrode with SnO 2 -Sb 2 O 4 -La as the intermediate layer were greatly improved. Under the conditions of initial rhodamine B (RhB) concentration of 20 mg/L, initial pH of 3.0, electrolyte concentration of 0.1 M, and current density of 30 mA cm −2 , the removal rates of color and TOC reached 100 % and 83.64 % after 20 mins and 30 mins, respectively. The electrode can also completely degrade methylene blue and methyl orange wastewater after 30 mins under the same conditions. The accelerated lifetime of the electrode reached 175 mins (1000 mA cm −2 , 1 M H 2 SO 4 ), and the actual lifetime was up to 3208 hrs. Based on the results of free radical quenching experiment and GC–MS detection, RhB degradation pathway was proposed: the aniline-based conjugated system of RhB molecule was attacked by the combined action of free radicals (indirect oxidation) and electrocatalysis (direct oxidation), which decomposed macromolecules into small molecules and ultimately mineralized them into CO 2 and H 2 O. This work is expected to provide a fresh research concept for preparing DSA electrodes with excellent catalytic performance and high stability.
研究领域:
环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Xiangjuan Ma,Yan Yan,Qizhou Dai,Jianxian Gao,Shengjue Liu,Yijing Xia
This study focused on the electrochemical oxidation of Acid Blue 9 (AB 9) under direct and pulse current modes using a Ti/SnO 2 -Sb/α,β-Polytetrafluoroethylene-Fe-PbO 2 (PTFE-Fe-PbO 2 ) anode. The results showed that 99.0% of AB 9 and 68.9% of COD could be eliminated at initial pH of 5, initial AB 9 concentration of 100 mg L -1 , pulse frequency of 4000 Hz, current density of 20 mA cm −2 and pulse duty cycle of 50% after 120 min of electrolysis. The pulse electrochemical oxidation of AB 9 at the investigated conditions followed pseudo-first-order kinetics. Compared with the direct current mode, 76.0% of energy consumption could be saved at pulse current mode. The effect of mass transfer and electrode distance on the pulse electrochemical oxidation of AB 9 was also investigated in terms of mass transfer coefficient and effectiveness factor, the results showed that the reduced electrode distance was beneficial to improve the mass transfer and oxidation efficiency, as well as the energy efficiency. LC-MS analysis revealed that benzenesulfonate group, C-N and C-S bonds in AB 9 molecule were initially cleaved under the attack of ⋅OH, then some carboxylic acids were formed and eventually mineralized to CO 2 and H 2 O. Therefore, pulse electrochemical oxidation with a PTFE-Fe-PbO 2 electrode might be a promising alternative to enhance the practicability of electrochemical treatment for dye wastewater.
研究领域:
环境工程
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电化学
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废水处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Huachang Jin,Xuejiao Zhang,Yang Yu,Xueming Chen
The extensive evaporation-induced aggregation of scale inhibitors in the wastewater of recirculating cooling systems causes severe environmental pollution . In this study, Amino Trimethylene Phosphonic Acid (ATMP), an ordinary scale inhibitor, was degraded via electrochemical oxidation using a multi-layered Ti/IrO 2 -RhO x -TiO 2 /α-PbO 2 /β-PbO 2 electrode. The electrochemical oxidation experimental results verified the superior electro-catalytic properties of the β-PbO 2 electrode. Accelerated lifetime tests suggested that Ti/IrO 2 -RhO x -TiO 2 /α-PbO 2 /β-PbO 2 possesses a service lifetime of 201 h under a current density of 40000 A/m 2 , which is 3.4–100.5 times as long as other β-PbO 2 electrodes reported by other researchers. Four major operational parameters, namely electrolyte, current density, initial ATMP concentration, and pH, were discovered to significantly affect the ATMP degradation rate and electrical efficiency. The direct oxidation mechanism predominated in the degradation process of ATMP, achieving a 55.11% and 38.82% removal efficiency in Na 2 SO 4 and NaCl solutions, respectively. In addition, two possible degradation pathways of ATMP were proposed: induced by the breaking of either C-P or C-N bonds.
研究领域:
环境工程
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电化学
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废水处理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xinxin Li,Linchuan Cong,Yupeng Wu,Nan Lin,Fangbing Liu,Deyuan Xin,Fuyu Han,Jin Yang,Weitong Chen,Haibo Lin
Electrochemical methods for catalytic furfural conversion have drawn significant interest in both academic and industrial research communities. Paired electrocatalytic conversion has been identified as a promising strategy for reducing energy consumption and promoting carbon neutrality. To optimize product distribution and conversion efficiency, we have developed a divergent paired electrochemical upgrading approach for furfural in acidic environments, with a focus on prioritizing strong gas evolution reactions and product transformations. The high electrocatalytic activity of CuSn/CuF@Cu prepared by electrodeposition can effectively inhibit the hydrogen evolution. The performance of the electrocatalysts and the pathways of electrocatalytic hydrogenation (ECH) of furfural to 2-methylfuran (MF) were investigated by combination of experiments and the density functional theory (DFT) calculations. A stable Ti/PbO 2 electrode with high oxygen evolution overpotential was prepared for anodic electrocatalytic oxidation (ECO) and the product transformation route was described. The conversion of furfural to maleic acid (MA) and MF in acidic environment was successfully achieved. In the paired electrosynthesis system, the electrons generated from anodic ECO of furfural are utilized in valuable and controllable cathodic ECH. It significantly and continuously reduces the power cost associated with renewable energy sources and further promotes the development of biomass electrochemical conversion.
研究领域:
电化学
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催化
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可再生能源
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生物质转化
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材料科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）