JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2010
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IF 2.338
Tao Liu,Xiangbin Zhu,Lin Cui,Peng Ju,Xiangjin Qu,Shiyun Ai
A novel and reliable electrochemical sensor based on PbO 2 -carbon nanotubes-room temperature ionic liquid (i.e., 1-butyl-3-methylimidazolium hexafluorophosphate, BMIMPF6) composite film modified glassy carbon electrode (GCE) (PbO 2 –MWNT–RTIL/GCE) was proposed for simultaneous and individual determination of guanine and adenine . The guanine and adenine oxidation responses were monitored by differential pulse voltammetric (DPV) measurement. Compared with the bare electrode, the PbO 2 –MWNT–RTIL/GCE not only significantly enhanced the oxidation peak currents of guanine and adenine, but also lowered their oxidation overpotentials, suggesting that the synergistic effect of PbO 2 , MWNT and RTIL could dramatically improve the determining sensitivity of guanine and adenine. The PbO 2 –MWNT–RTIL/GCE showed good stability, high accumulation efficiency and enhanced electrocatalytic ability for the detection of guanine and adenine. Besides, the modified electrode also exhibited good behaviors in the simultaneous detection of adenine and guanine with the peak separation of 0.29 V in 0.1 M pH 7.0 phosphate buffer solution (PBS). Under the optimal conditions, the detection limit for individual determination of guanine and adenine was 6.0 × 10 −9 M and 3.0 × 10 −8 M ( S / N = 3), respectively. The proposed method for the measurements of guanine and adenine in herring sperm DNA was successfully applied with satisfactory results.
研究领域:
生物化学
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分析化学
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产品关联
DOI
高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Jiaxin Li,Mo Li,Da Li,Qinxue Wen,Zhiqiang Chen
Coal gasification wastewater (CGW) contains a large amount of toxic pollutants , which seriously affects the subsequent biochemical treatment. In order to investigate the efficiency of electrocatalytic oxidation on pretreatment of CGW, lead dioxide electrodes doped with PEG and Bi were successfully prepared. Scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction were comprehensively used to characterize the lead dioxide electrode and the electrochemical performance was also tested by linear sweep voltammetry curve, cyclic voltammetry curve and AC impedance. Biodegradability and toxicity of CGW were evaluated by dehydrogenase activity and acute toxicity, respectively. Results showed that the doping of PEG and Bi significantly improved the electrochemical performance and catalytic oxidation performance of lead dioxide electrodes. The degradation rate of phenol by Sn–Sb/PbO 2 (PEG + Bi) electrode were 1.57 times of that by pure lead dioxide electrode. The removal of TOC and total phenols were 53.2% and 82.7%, respectively at 120 min under 40 mA cm −2 by Sn–Sb/PbO 2 (PEG + Bi) electrode. The changes of biodegradability, biological toxicity and by-products were analyzed. Furthermore, 3,5-dimethylphenol was used as characteristic pollutant to study the degradation mechanism of phenolic pollutants in electrocatalytic system. According to the intermediate products detected by GC-MS, possible degradation pathways in electrocatalytic system were proposed.
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
PubMed
高影响因子
Journal of Physical Chemistry C
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2022
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IF 4.177
Qiuyang Yu,Ziyi Jiang,Jinlong Yin,Shengli Chen,Xiaohong Hu
Because of its metal-like conductivity, excellent catalytic activity, and acid resistance, lead dioxide (PbO2) is the most used electrocatalyst for the practical electrochemical ozone production (EOP) technique. Introducing fluorine (F) into PbO2 electrodes or electrolytes can significantly improve EOP activity. However, there is still lack of valid evidence on understanding the role of doping F in the PbO2 electrode. In this work, we report a comprehensive study on the effect of F on EOP activity on electrochemically prepared PbO2 electrodes. F doping suppresses the side reaction of dioxygen (O2) evolution by inhibiting the formation of an α phase impurity of PbO2 electrodes. The more hydrophobic surfaces by doping F promote O2 adsorption as evidenced by low-temperature O2-temperature-programmed desorption experiments and thus are more favorable for ozone (O3) generation. The in situ isotope labeling oxygen (18O2) experiment proves that at room temperature, O2 can adsorb and dissociate on the operando PbO2 electrode surface and participate in the formation of O3 molecules. This work provides a comprehensive understanding of doping F for enhanced EOP.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Frontiers in Chemistry
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2019
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IF 3.782
Weng Mili,Yu Xihe
In this study, La and Ce doped PbO2 electrodes were prepared and the characteristic of the electrodes were discussed with the help of structure analysis. The catalytic effects of the doped electrodes were explored through the degradation of para-aminophenol wastewater. The results showed that the para-aminophenol removal was 96.96%, 89.34%, and 77.55% after 180 min treatment with Ce-PbO2, La-PbO2, and PbO2, respectively. The para-aminophenol enhanced degradation mechanism was discussed with rare earth element doping electrodes and a kinetic model was established based on radical reactions mechanism with genetic algorithm (GA) calculation. The reaction constants of these electrodes were calculated and the results showed that the reaction constant of Ce-PbO2 electrode was the highest, which indicated that Ce-PbO2 electrode could have a better treatment effect. The EE/O was used as the index of energy consumption efficiency and the results were calculated and compared. This paper could provide basic data and technique reference of the prediction the oxidation reaction process of different electrodes for the electrochemical oxidation application in wastewater treatment.
研究领域:
环境科学
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电化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2024
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IF 4.1
Tianyang Liu,Junli Wang,Xuanbing Wang,Jinlong Wei,Xiaoning Tong,Shengyou Su,Ju Zhang,Yuantao Yang,Ruidong Xu,Linjing Yang
The traditional Pb-Ag anodes used in zinc electrowinning exhibit high overpotential for oxygen evolution reaction (OER) and poor mechanical strength, leading to high energy consumption. To overcome the shortcomings, Ti/SnO 2 -Sb 2 O 4 /PbO 2 -La-doped MnCo 2 O 4.5 composite anode was prepared by this work. It demonstrated enhanced electrochemical performance, requiring 565 mV to reach the benchmark current density of 50 mA cm −2 , and the Tafel slop of 179.79 mV dec –1 in the acidic media containing 50 g L –1 Zn 2+ and 150 g L –1 H 2 SO 4 . According to the results of XPS, the content of Mn 4+ and Co 3+ increased, which was beneficial to promote the OER catalytic activity of the electrode. The current efficiency was improved by 1.7 % compared with traditional Pb-0.76 % Ag anode, resulting in a significant reduction in energy consumption of 477.46 kW∙h for producing one ton of zinc. Moreover, the Ti/SnO 2 -Sb 2 O 4 /PbO 2 -La-doped MnCo 2 O 4.5 anode showed excellent corrosion resistance, and the accelerated service time was extended to 50 h at 2 A cm −2 . The service life of the electrode was extended thanks to the introduction of the intermediate layer and La-doped MnCo 2 O 4.5 powder. Therefore, this work provided a novel strategy to prepare the anodes with enhanced electrochemical performance applied in zinc electrowinning and other aspects.
研究领域:
材料科学
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电化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Jiade Wang,Jiachao Yao,Lou Wang,Qinwen Xue,Zhongting Hu,Bingjun Pan
Electrochemical oxidation under pulse current mode was employed to treat bio-refractory dye wastewaters (i.e., Indigo Carmine [IC], Alizarin Red S [ARS], and Methyl Orange [MO]) with PbO 2 /Ti anode, and Box-Behnken designs (BBDs) were conducted to optimize the operating parameters for enhancing energy efficiencies. Pulse duty cycle, current density, and flow rate of effluent were determined to be the influencing factors for the degradation performance, and analyses of BBDs further revealed that the influencing degrees of these factors follow the order: current density > pulse duty cycle > flow rate for the degradation of IC and MO, but such conclusion is not applicable to that of ARS. the fused-rings structure of ARS is more difficult to be electro-oxidized than the ring-bridge-ring structures of IC and MO. The optimal solutions with the criteria of maximizing TOC degradation and minimizing energy consumption were obtained by the model fitting of BBDs, and with the optimized operating parameters the energy consumptions can be saved up to 35.5%, 40.1%, and 47.9% for IC, ARS, and MO, respectively, as compared with the traditional electrolysis process with galvanostatic mode. Such optimization method can improve the practicability of electrochemical oxidation process. Further investigation of quantitative relationships between the degradation efficiencies and the structures of organic pollutants is believed to help guide parameter optimizing, and such work is currently underway.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 17
·10634-10645
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IF 4.036
Wenhao Jiang,Junli Wang,Xuanbing Wang,Jiang Liao,Jinlong Wei,Ruidong Xu,Linjing Yang
The conventional Pb–Ag alloy possesses a high oxygen evolution reaction overpotential, poor stability, and short service life in acidic solutions, making it an unsuitable sort of anode material for the zinc electrowinning process. Therefore, a layered carbon-covered cobalt tetroxide (Co3O4@C)-reinforced PbO2-coated electrode is fabricated via a facile two-step pyrolysis-oxidation and subsequent electrodeposition process. As a result, the reinforced PbO2-coated electrode exhibits a low OER overpotential of 517 mV at 500 A m−2 and a Tafel slope of 0.152 V per decade in a zinc electrowinning simulation solution (0.3 M ZnSO4 and 1.53 M H2SO4). The reduced overpotential of 431 mV at 500 A m−2 compared to traditional Pb–0.76%Ag alloy leads to improved energy savings, which is attributable to the presence of Co3O4@C to refine the grain size and thus increase the effective contact area. Moreover, the reinforced PbO2-coated electrode has a prolonged service life of 93 h at 20 000 A m−2 in 1.53 M H2SO4. Therefore, an accessible and efficient strategy for preparing a coated electrode to improve OER performance for zinc electrowinning is presented in this research.
研究领域:
材料科学
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电化学工程
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产品关联
DOI
PubMed
高影响因子
Environmental Science-Water Research & Technology
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2022
·Vol. 8
·期 10
·2231-2244
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IF 5.819
Jun Zhao,Jingquan Wang,Erdeng Du,Yijie Ai,Jingjing Liu,Hongguang Guo
The increasing need for water decontamination under high salinity conditions calls for alternative processes with high efficiency and cost-effective performance, of which electrochemical technologies hold continuous attraction. Compared to several studies under chloride background, contaminant degradation in high sulfate concentrations using electrochemical methods has rarely been studied. In this study, a facile and cost-effective TiO2 nanotube (NT) electrode, coated with a PbO2 layer was fabricated to serve as an anode to degrade the selected contaminant under the condition of high sulfate concentration. 100% removal of 0.05 mM 2,4-dichlorophenol (2,4-DCP) was achieved within 50 minutes at a relatively low current density. Degradation of 2,4-DCP followed pseudo-first-order kinetics in the electrochemical system, and the parameter of current density was proved to have the biggest effect on the pollutant removal performance compared to pH and salt concentrations. The mechanism of 2,4-DCP degradation followed the radical and direct electron transfer (DET) pathways. Even though the sulfate radical was generated in water containing high sulfate, the theoretical energy barrier calculated from density functional theory (DFT) simulation indicates the priority of hydroxyl radical on pollutant degradation, and the comparison of reaction energy based on experiments and DFT also suggested that the sulfate radical is more prone to act as a precursor for more hydroxyl radical formation. The degradation performance under various salt conditions was also investigated in this study. High content of chloride in water resulted in extremely fast removal performance, while high content of nitrate in water resulted in the apparent inhibition of pollutant removal. The as-made electrodes exhibited excellent performance for the degradation of different contaminants and reliable stability after rounds of use. This study provides an insight into the application of an electrochemical oxidation system in high salinity wastewater treatment.
研究领域:
环境工程
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电化学
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水处理
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材料科学
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化学工程
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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）