JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
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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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Zhaohui Han,Lei Xu,Chandrasekar Srinivasa Kannan,Jianhua Liu,Sivasankar Koppala,Shaohua Ju,Libo Zhang
In this paper, an Al/TiB 2 layered composite was prepared by plasma spraying for use as the base material to reduce resistivity and improve electrochemical performance in an electrode. The β-PbO 2 coating was prepared by electrochemical deposition . Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to study the Al/TiB 2 composite and the β-PbO 2 coating. The electrochemical performance of the Al/TiB 2 /β-PbO 2 and Ti/β-PbO 2 composites was studied by linear sweep voltammetry (LSV), Tafel polarization curves (Tafel) and electrochemical impedance spectroscopy (EIS). The results indicate that Al/TiB 2 /β-PbO 2 composite electrode materials with a uniform structure were successfully prepared by plasma spraying and electrochemical deposition. The structure of the Al/TiB 2 composite improves the conductivity of the electrode matrix, the optimal value of conductivity is 2.76 × 10 7 S m −1 , and the optimal value of density is 8.758 g cm −3 for β-PbO 2 coating. The composite also decreases the charge resistance in the double layer structure of the electrode surface, accelerating the charge transfer rate. Compared with the Ti matrix, the Al/TiB 2 /β-PbO 2 exhibited the best corrosion-resistant performance and electrochemical catalytic activity for electrowinning of nonferrous metals .
研究领域:
材料科学
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电化学工程
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Song Wu,Junli Wang,Xuanbing Wang,Di Jiang,Jinlong Wei,Xiaoning Tong,Zhenwei Liu,Qingxiang Kong,Naixuan Zong,Ruidong Xu,Linjing Yang
s Ti-based PbO 2 electrodes must currently address the high overpotential and low corrosiveness of the anodic oxygen evolution reaction (OER) during zinc electrowinning. In this study, a composite electrode composed of Ti/TiH 2 /β-PbO 2 − Mn 3 O 4 @C (0.6 g L –1 ) was fabricated using Ti/TiH 2 generated by electrochemical reduction of Ti/TiO 2 prepared by laser ablation as an intermediate layer, co-deposited β-PbO 2 , and Mn 3 O 4 @C micro-flakes prepared by high-temperature pyrolysis-oxidation as the active layer. In a zinc electrowinning test solution (50 g L –1 ZnSO 4 mixed with 150 g L –1 H 2 SO 4 ), the oxygen evolution and corrosion behavior of the obtained Ti/TiH 2 /β-PbO 2 − Mn 3 O 4 @C composite anodes were systematically investigated. Ti/TiH 2 /β-PbO 2 − Mn 3 O 4 @C (0.6 g L –1 ) exhibited a low overpotential of 493 mV, a low Tafel slope of 73.6 mV dec −1 , a low i corr of 2.320 × 10 −5 A cm −2 and voltage stability of 1.65 V vs. RHE for up to 72 h in stability tests, with an overall performance outperformed most of the reported Ti-based PbO 2 electrode materials. The outstanding catalytic activity is primarily attributable to the low resistance and porous interlayer of TiH 2 nanosheets, which speeds up the rate of electron transfer. The addition of Mn 3 O 4 @C micro-flakes to the active layer enhances the composite electrode's OER performance and corrosion resistance.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2023
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IF 2.8
Ruizhi Feng,Ying Zhang,Caigan Yan,Haihe Xiao,Xiaobiao Zhu,Xiaohui Wang
Electrochemical advanced oxidation processes (EAOPs) has attracted wide attention to researchers on all walks of life for the treatment of stubborn pollutants because of the strong oxidizing properties. However, the electrode materials currently developed have problems such as short life and low catalytic activity. In this work, the modification of PbO 2 electrode was started by introducing into blue nanotubes (Blue-TiO 2 -NTs) based on the titanium plate to enhance the conductivity of the electrode. Then the β-PbO 2 active layer was optimized by using cerium (Ce) and dodecyl trimethyl ammonium bromide (CTAB) through the method of electrodeposition to improve the electrocatalytic oxidation and stability. In the experiment of electrochemical oxidation, the degradation efficiency of phenol (100 mg/L) reached more than 96% after 120 min on the Blue-TiO 2 /PbO 2 -Ce-CTAB electrode. To further investigate the optimization mechanism of the Blue-TiO 2 /PbO 2 -Ce-CTAB anode in the electrocatalytic oxidation process, the surface structure, morphology, volt-ampere charge, oxygen evolution potential, and charge transfer resistance were evaluated. The result showed that the addition of CTAB reduced the crystal particles of PbO 2 , higher specific surface area of the electrode longitudinally by the Ce element, lower oxygen evolution potential, and smaller the resistance of charge transfer. Finally, the service life of the electrode was 6792 h by the accelerated life test on the current density of 25 mA cm −2 . The energy consumption after 240 min of degradation was 0.079 kWh gCOD −1 .This research proves that the Blue-TiO 2 /PbO 2 -Ce-CTAB electrode has potential application value in the degradation of phenol wastewater.
研究领域:
环境科学
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电化学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Aiyuan Li,Jiaqi Weng,Xinmei Yan,Hao Li,Haibo Shi,Xuedong Wu
This study compares the electrochemical oxidation of acid orange 74 (AO 74), a typical metal complex azo dye, on four anode materials (Ru, IrO 2 , PbO 2 , and boron doped diamond (BDD)). The results show that the BDD electrode was quite efficient in the anodic oxidation of AO 74 with a 100% removal of AO 74 and an 84.3% removal of COD. Analyzing the active species at different electrodes, we reported that oxidation on an inert electrode primarily depends on direct oxidation and indirect oxidation of active radicals ( OH and O 2 − for the BDD anode and OH for the PbO 2 anode), whereas active electrodes (Ru and IrO 2 ) primarily depend on direct oxidation. The UV–vis spectrum demonstrated that Cr 3+ could be oxidized only on the BDD anode, proving that the BDD electrode has the highest oxidation potential. Similar organic intermediates species were observed on different electrodes by GC–MS. Furthermore, the different organic products are attributed to the difference in the oxidation ability of the electrodes. From the UV–vis spectrum and GC–MS analysis, we speculate that AO 74 was first degraded to aromatic compounds and pyrazole because of the cleavage of the azo-bond. Then it formed amides and organic acid because of the cleavage of the benzene ring, and finally CO 2 and H 2 O were formed.
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
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 10
·103504
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IF 3.9
Lu Chen,Qibin Tao,Lin Wang,Hao Lan,Qizhou Dai
In this study, a lead dioxide electrode co-modified with carbon microspheres and neodymium (CMS-Nd-PbO2) was prepared. The structural morphology and electrochemical properties of the four electrodes, PbO2, CMS-PbO2, Nd-PbO2, and CMS-Nd-PbO2, were compared by field emission scanning electron microscopy, X-ray diffractometer, X-ray photoelectron spectroscopy, cyclic voltammetry, and electrochemical impedance, respectively. The results showed that the prepared CMS-Nd-PbO2 electrode had higher surface denseness and higher electrode activity. Based on the accelerated lifetime experiment, the actual working life of four electrodes was studied, and the CMS-Nd-PbO2 electrode had a relatively long lifetime, increased 24.60% compared with the PbO2 electrode. The influencing parameters of electrochemical degradation of bisphenol S (BPS) by CMS-Nd-PbO2 electrode, the ability of different electrodes to generate hydroxyl radicals, reaction mechanism, and the possible BPS degradation pathways were also discussed. Further, the safety of the prepared electrode was evaluated. Under the optimal parameters, the removal rate of BPS and chemical oxygen demand (COD) were 96.49% and 51.84%, respectively. The dissolved lead ion concentration in the solution after electrochemical oxidation was lower than the WHO standard. The CMS-Nd-PbO2 electrode showed promising applications in the degradation of emerging contaminants wastewater.
研究领域:
环境科学
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电化学工程
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Hao Lan,Qibin Tao,Nengwei Ma,Lu Chen,Lanlan Wei,Mili Weng,Qizhou Dai
In this work, a new type of graphene oxide and Yb co-modified PbO 2 electrode (Yb-GO-PbO 2 ) was prepared by the electrodeposition method. Lamivudine was selected as the model contaminant to evaluate the electrochemical performance of the Yb-GO-PbO 2 electrode, and it was found that the Yb-GO-PbO 2 electrode could obviously enhance the degradation of lamivudine compared with the PbO 2 electrode. Meanwhile, the Yb-GO-PbO 2 electrode was systematically characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD), which showed that the Yb-GO-PbO 2 electrode processed a denser surface, smaller crystal size, and a greater proportion of hydroxyl oxygen species. Electrochemical measurements demonstrate that the Yb-GO-PbO 2 electrode processes many prominent features compared to the PbO 2 electrode, such as larger electrochemically active surface area, smaller charge transfer resistance, and higher oxygen evolution potential. The effects of lamivudine initial concentration, current density, electrolyte concentration, and initial pH on the degradation of lamivudine were studied and analyzed. The removal rates of lamivudine and COD reached 99.6% and 65.1%, respectively, when treated for 120 min under optimal process conditions. The electrochemical degradation of lamivudine fitted pseudo-first-order reaction kinetics. The intermediates of lamivudine degradation were determined using UPLC-MS, and possible degradation pathways of lamivudine were proposed. This paper provides a promising approach for enhancing the electrochemical oxidation performance of PbO 2 electrodes by introducing GO and Yb.
研究领域:
环境化学
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电化学
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材料科学
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水处理技术
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污染物降解
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DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2019
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IF 4.527
Ying Zhang,Ping He,Lianhong Zhou,Faqin Dong,Dingming Yang,Hong Lei,Licheng Du,Lingpu Jia,Shiping Zhou
The presence of pesticides in water has emerged as a momentous environmental issue over the past decades. Herein, a terbium doped Ti/PbO 2 (denoted as Ti/PbO 2 –Tb) dimensionally stable Ti/PbO 2 –Tb anode has been successfully prepared by one-step electrodeposition path for electrocatalytic degradation of imidacloprid (IMD) wastewater with high efficiency. Ti/PbO 2 –Tb electrode presents higher oxygen evolution potential, lower charge transfer resistance, stronger stability, longer service lifetime and outstanding electrocatalytic activity than Ti/PbO 2 electrode. The optimum condition for IMD oxidation is obtained by analyzing the effects of some critical operating parameters including temperature, initial pH, current density and electrolyte concentration. It is proved that 70.05% of chemical oxygen demand and 76.07% of IMD are removed after 2.5 h of degradation under current density of 8 mA cm −2 , pH 9, temperature 30 °C and 7.0 g L −1 NaCl electrolyte. In addition, the electrode displays commendable energy saving property as well as favorable reusability. The degradation mechanism of IMD is proposed by analyzing the intermediates identified by LC-MS. The present research provides a feasible strategy to degrade IMD wastewater by Ti/PbO 2 –Tb electrode.
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
Environmental Science-Water Research & Technology
·
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qian Zhou,Derong Liu,Guoyuan Yuan,Yi Tang,Kuncheng Cui,Songshan Jiang,Yongde Xia,Wei Xiong
Novel Ti/PbO 2 -Cr-PEDOT electrodes were prepared by electrodeposition for electrochemical degradation of phenolic wastewater. The electrodes were characterized by XRD, SEM-EDS, XPS, and FT-IR to study the crystalline, surface morphology, elements distribution, and microstructure of the electrodes. A flat and compact interface was obtained with Cr and PEDOT doping into β-PbO 2 plate by electrodeposition method. The linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were conducted to explore the electrochemical performance of the prepared electrodes. The Ti/PbO 2 -Cr-PEDOT electrode exhibited a higher oxygen evolution potential (OEP, 2.53 V vs SCE) and a lower charge transfer resistance compared with Ti/PbO 2 . Phenol degradation efficiency of 100% and TOC removal rate of 95.02% were achieved in the electrochemical degradation of phenol within 120 min. The optimal process parameters (phenol concentration = 1000 mg·L -1 , electrolyte concentration = 4.0 g·L -1 , current density = 15 mA·cm −2 and electrode distance = 3 cm) in the process of electrochemical oxidation of phenol wastewater were explored. Active species trapping experiments proved that ·OH radicals played an important role in the electrochemical system. Furthermore, the electrode also showed high activity for the degradation of other phenolic wastewaters such as phloroglucinol (η DEP = 100%), bisphenol A (η DEP = 97.17%) and p-chlorophenol (η DEP = 89.77%) within 60 min. A possible degradation pathway was proposed based on the intermediate products determined by HPCL. The Ti/PbO 2 -Cr-PEDOT electrode showed excellent stability with only 3% loss of degradation efficiency (η DEP = 96.95%) after recycling tests for 5 times. These results suggest that Ti/PbO 2 -Cr-PEDOT is a promising electrode for electrochemical degradation of phenolic wastewaters.
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
CHEMOSPHERE
·
2022
·
IF 8.943
Jingsong Dai,Huajun Feng,Kefan Shi,Xiangjuan Ma,Yan Yan,Ling Ye,Yijing Xia
A novel PbO 2 electrode was fabricated by adding graphene nanoplatelets (GNP) inter-layer into β-PbO 2 active layer (called GNP-PbO 2 ) and utilized to degradation of antibiotic enoxacin (ENO). The GNP-PbO 2 electrode had a much rougher surface than the typical PbO 2 electrode, with smaller crystal size and lower charge-transfer resistance at the electrode/electrolyte interface. Notably, the GNP inter-layer increased the oxygen evolution potential of PbO 2 electrode (2.05 V vs. SCE), which was very beneficial to inhibit oxygen evolution and promote ·OH production. The relatively best operating parameters for ENO removal and energy efficiency were current density of 20 mA cm −2 , initial pH of 7, initial ENO concentration of 100 mg L −1 and electrode distance of 4 cm. Furthermore, indirect radical oxidation was found to be the main way during electrolysis process. Based on the observed analysis of intermediate products, the main reaction pathways of ENO included hydroxylation, defluorination and piperazine ring-opening. Finally, combinating with the electro-oxidation capability, stability and safety evaluation, we can conclude that GNP-PbO 2 is a promising anode for treatment of various organic pollutants in wastewater.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2019
·Vol. 14
·期 2
·1-16
·
IF 3.883
Wang Xiangyu,Xie Yu,Yang Guizhen,Hao Jiming,Ma Jun,Ning Ping
The secondary pollution caused by modification of an electrode due to doping of harmful materials has long been a big concern. In this study, an environmentally friendly material, conductive carbon black, was adopted for modification of lead dioxide electrode (PbO 2 ). It was observed that the as-prepared conductive carbon black modified electrode (C-PbO 2 ) exhibited an enhanced electrocatalytical performance and more stable structure than a pristine PbO 2 electrode, and the removal efficiency of metronidazole (MNZ) and COD by a 1.0% C-PbO 2 electrode at optimal conditions was increased by 24.66% and 7.01%, respectively. Results revealed that the electrochemical degradation of MNZ wastewater followed pseudo-first-order kinetics. This intimates that the presence of conductive carbon black could improve the current efficiency, promote the generation of hydroxyl radicals, and accelerate the removal of MNZ through oxidation. In addition, MNZ degradation pathways through a C-PbO 2 electrode were proposed based on the identified intermediates. To promote the electrode to treat antibiotic wastewater, optimal experimental conditions were predicted through the Box-Behnken design (BBD) method. The results of this study suggest that a C-PbO 2 electrode may represent a promising functional material to pretreat antibiotic wastewaters.
研究领域:
环境科学
·
电化学工程
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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）