RSC Advances
·
2021
·Vol. 11
·期 46
·28949-28960
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IF 3.361
Ze Lv,Zhen Chen,Qiang Yu,Wei Zhu,Hongjun You,Bangyao Chen,Zhaoyi Zheng,Yuanyuan Liu,Qi Hu
PbO2–Co3O4–MnO2 electrodes, used in the electrowinning industry and in the degradation of organic pollutants, have demonstrated an elevated performance through macroscopic electrochemical measurements. However, few reports have investigated localized electrochemical performance, which plays an indispensable role in determining the essential reasons for the improvement of the modified material. In this study, the causes of the increase in electrochemical reactivity are unveiled from a micro perspective through scanning electrochemical microscopy (SECM), X-ray diffraction (XRD), Raman microscopy (Raman), and X-ray photoelectronic energy spectroscopy (XPS). The results show that the increase of electrochemical reactivity of the modified electrodes results from two factors: transformation of the microstructure and change in the intrinsic physicochemical properties. Constant-height scanning maps indicate that the electrochemical reactivity of the modified electrodes is higher than that of the PbO2 electrode on the whole and high-reactivity areas are orderly distributed, coinciding with the observations from SEM and XRD. Thus, one of the reasons for the improvement of the modified electrode performance is the refinement of the microscopic morphology. The other reason is the surge of the oxygen vacancy concentration on the surface of the coating, which is supported by XRD, Raman and XPS. This finding is detected by the probe approach curve (PAC), which can quantitatively characterize the electrochemical reactivity of a substrate. Heterogeneous charge transfer rate constants of the modified electrode are 4–5 times higher than that of the traditional PbO2 electrode. This research offers some insight into the electrochemical reactivity of modified PbO2 electrodes from a micro perspective.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Membranes
·
2022
·Vol. 12
·期 8
·814
·
IF 4.562
Liankai Gu,Yonghao Zhang,Weiqing Han,Kajia Wei
Membrane fouling and regeneration are the key issues for the application of membrane separation (MS) technology. Reactive electrochemical membranes (REMs) exhibited high, stable permeate flux and the function of chemical-free electrochemical regeneration. This study fabricated a micro-filtration REM characterized by a PbO2layer (PbO2-REM) to investigate the electro-triggered anti-fouling and regeneration progress within REMs. The PbO2-REM exhibited a three-dimensional porous structure with a few branch-like micro-pores. The PbO2-REM could alleviate Humic acid (HA) and Bisphenol A (BPA) fouling through electrochemical degradation combined with bubble migration, which achieved the best anti-fouling performance at current density of 4 mA cm−2with 99.2% BPA removal. Regeneration in the electro-backwash (e-BW) mode was found as eight times that in the forward wash and full flux recovery was achieved at a current density of 3 mA cm−2. EIS and simulation study also confirmed complete regeneration by e-BW, which was ascribed to the air–water wash formed by bubble migration and flow. Repeated regeneration tests showed that PbO2-REM was stable for more than five cycles, indicating its high durability for practical uses. Mechanism analysis assisted by finite element simulation illustrated that the high catalytic PbO2layer plays an important role in antifouling and regeneration.Keywords:membrane fouling;reactive electrochemical membrane;PbO2catalytic layer;antifouling;regeneration
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Water
·
2020
·Vol. 12
·期 5
·1317
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IF 2.544
Yan Zhang,Zhili Ni,Jie Yao
The electrochemical oxidation processes have attracted tremendous attention on the destruction of toxic and non-biodegradable organics. A series of neodymium (Nd)-doped PbO2electrodes (Ti/PbO2-Nd) were synthesized through a pulse electrodeposition method, and its activity of bisphenol S (BPS) removal was further examined. The morphologies and structures were characterized by the X-ray diffraction (XRD), scanning electron microscopy (SEM) and an energy dispersive spectrometer (EDS). The performance, energy consumption and mechanism of electrochemical oxidation of BPS by Ti/PbO2-Nd electrode were also discussed. Compared to the traditional Ti/PbO2electrode, the Ti/PbO2-Nd enables finer crystal particles, facilitating the oxygen evolution overpotential (OEP) from 1.41V to 1.55V and the generation of hydroxyl radicals (•OH). Moreover, lower duty cycles during the preparation of the electrode also contribute to the tapering size of crystals. The results show that the Ti/PbO2-Nd electrode exhibits relatively high activity in the anodic oxidation of BPS. Over 95% of BPS could be removed with the current density of 15 mA cm−2. Moreover, the energy consumption of BPS degradation on Ti/PbO2-Nd electrode is 60.26 kWh m−3, much lower than that on Ti/PbO2electrode (95.45 kWh m−3). To conclude, the Ti/PbO2-Nd electrode has been proven to be a promising material for BPS removal.Keywords:bisphenol S;electrochemical degradation;Ti/PbO2-Nd electrode;mechanism;duty cycle
研究领域:
环境科学
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电化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 4
·043505
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IF 3.3
Xuefei Zhang,Bing Wu,Siwei Zhuang,Jianglin Cao
Electrocatalytic oxidation using PbO2 electrodes is a prospective strategy for treatment of bio-refractory dye wastewater. However, it is hindered by high energy consumption, poor degradation efficiency, and low anode stability. Here, PbO2 electrodes were reconstructed by intercalating and surface-intervening with graphene oxide (GO) to enhance the stability of the composite electrodes and achieve high-efficiency oxidation of cationic red GTL. Compared with that on PbO2, reactive oxygen species (e.g., ·OH and ·O) on GO-PbO2 were less consumed by the oxygen evolution reaction due to their larger spacing on GO-PbO2. In addition, GO-PbO2 showed lower cell voltage than PbO2, indicating a higher electron transfer rate and lower energy consumption. The coupled free radical behavior and electron transfer enhanced the decolorization (1.7 times that of PbO2) and mineralization (1.4 times that of PbO2) rate of cationic red GTL on GO-PbO2. Furthermore, doping of GO with multilayer structure improved the stability of PbO2 anode and its performance improvement mechanism was revealed. The prepared GO-PbO2 electrode prolonged service-life (162 h) under accelerated electrolysis, about 2.7 times that of the PbO2 electrode (60 h). This work provides a novel GO-PbO2 electrode for efficient electrocatalytic degradation of GTL, and can be easily extended to electro-degradation of non-biodegradable wastewater.
研究领域:
环境科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2019
·Vol. 166
·期 13
·D638
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IF 3.12
Pengfei Xu,Xiaohong He,Junwei Mao,Yongming Tang
In this paper, Ti/SnO2-Sb/Ce-PbO2 anode is electrodeposited from MSA bath, and the effect of Ce3+ concentration in bath on the phase composition and morphology of lead dioxide electrode is elucidated. It is found that with the addition of 2 mM Ce3+ ion to the bath the Ce-PbO2 anode exhibits highest stability in 0.5 M H2SO4, and cerium exists as Ce (IV) in the PbO2 film. The electrocatalytic activity of lead dioxide anode for phenol removal is slightly enhanced by the inclusion of Ce. The significant improvement in electrocatalytic activity can be achieved by the addition of small amount of Bi3+ ion to the bath containing Ce3+ ion. In this study, electrocatalytic activities of various anodes follow the order: Ce,Bi-PbO2 > Ce-PbO2 > undoped PbO2 > Bi-PbO2.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
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2020
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IF 3.338
Shiwei He,Ruidong Xu,Li Sun,Youqi Fan,Zhuo Zhao,Huan Liu,Huihong Lv
In this study, a new anode based on Pb-0.3%Ag/α-PbO 2 /β-PbO 2 -Co 3 O 4 composite is proposed and its performance is compared with that of the traditional Pb-1wt%Ag anode during long-term zinc electrowinning . The electrocatalytic activity of the new anode for the oxygen evolution reaction (OER) initially decreased and then gradually increased, which was attributed to the phase transition occurring at the surface of the anode, and its corrosion resistance was gradually improved with the progress of electrowinning. Further, the electrochemical characteristics, cell voltage , current efficiency , and energy consumption of the two anodes were evaluated after 16 days of electrowinning. The OER electrocatalytic activity and corrosion resistance of the new anode were observed to be higher than those of the traditional anode. In addition, the cell voltage and power consumption of the new anode were significantly lower than those of the traditional anode. Furthermore, compared to the traditional anode, the energy consumption for producing 1 t of zinc was reduced by 358.13 kWh based on the new anode.
研究领域:
电化学
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材料科学
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冶金工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 16
·期 8
·11042-11047
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IF 9.9
Wang Lei,Zhang Yuehan,Sun Xiaoxuan,Li Yunhui,Zhai Junfeng,Dong Shaojun
Eco-friendly chemical oxygen demand (COD) sensors are highly desired with respect to the importance of COD determination in environmental protection. In this work, a new FTO/TiO 2 /PbO 2 (FTO = fluorine-doped tin oxide) electrode was fabricated with a two-step method and used as an eco-friendly electrochemical COD sensor. The interlayer TiO 2 was employed to strengthen the adhesion of PbO 2 on the FTO substrates by providing a large TiO 2 /PbO 2 interface area. The effects of the factors including applied potential, supporting electrolyte concentration and stirring speed on the sensing performance were investigated. Under the optimized conditions, linear responses to the COD of water with different COD sources were achieved, and a linear range from 5 to 120 mg/L was obtained in the case of sucrose as the COD source. The relative standard deviations (RSD) were determined to be less than 9% for the glucose solutions with the COD of 7.5, 12.5 and 17.5 mg/L. For real sample analysis, the obtained results were comparable with those measured with the conventional dichromate method, with a relative error less than 11%.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2022
·
IF 4.598
Jiali Yuan,Zhen Chen,Qiang Yu,Wei Zhu,Shuting Li,Lei Han,Xia Lu,Shutong Li,Yize Wu,Ze Lv,Hongjun You,Bangyao Chen
Electrode materials are the core of electrocatalytic oxidation technology. Herein, chitosan (CTS)-modified halloysite nanotubes (HNTs) were used for the first time in the doping modification of PbO 2 electrodes by electrodeposition technique, and novel HNTs-CTS-PbO 2 anodes were prepared and used for the electrochemical removal of the thiazine dye methylene blue (MB). The surface structure information, electrochemical properties and oxidation activity of the materials were systematically investigated, and possible degradation pathways of methylene blue were proposed. The results showed that after doping modification, the coating became flatter and denser, and the crystalline shape and crystalline phase of the PbO 2 electrode did not change, but the grain size was significantly reduced; moreover, the modified electrode had higher oxygen precipitation overpotential, larger reactive surface area and lower charge transfer resistance. Additionally, the decolorization degradation of MB by HNTs-CTS-PbO 2 electrode mainly adopts an indirect degradation mechanism and follows the pseudo-first-order kinetic model, which exhibits higher decolorization degradation rate. Analyzing the mechanism of the electrochemical removal of MB from the modified anode, which mainly involves the breakage of C N bonds under the action of ·OH, followed by demethylation and aromatic ring cleavage to obtain monoaromatic amines, sulfonic acids and phenolic compounds, and finally mineralized into inorganic small molecules such as CO 2 and H 2 O. The above results show that HNTs-CTS-PbO 2 anode is a promising candidate in the field of dye wastewater degradation and provide new insights for the application of HNTs .
研究领域:
环境科学
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材料科学
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电化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
·
IF 7.968
Guohua Dong,Linlin Dong,Kun Lang,Dongfeng Chai,Dongxuan Guo,Jinlong Li,Ming Zhao,Shijie Chen,Wenzhi Zhang
At present, the development of high-efficient electrocatalyst is still of great urgency for efficiently eliminating the refractory antibiotics. Herein, a novel Ti/FeTiO 3 /Ce-PbO 2 laminated electrode (TFCP) is firstly constructed via introducing FeTiO 3 interlayer into the Ti/Ce-PbO 2 (TCP). After systematical investigation on the Ti/FeTiO 3 (TF), TCP and TFCP anode with scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) measurements, the electrocatalytic properties of these electrocatalysts have been compared by checking electrocatalytic degradation towards levofloxacin (LEVO) antibiotics coupled with systematical optimization on the electrode preparation conditions and electrocatalytic degradation process parameters. Dramatically, the optimal TFCP delivers higher removal 95% of LEVO within 120 min than those of TF (63%) and TCP (49%). Quite obviously, the introduction of FeTiO 3 interlayer is the important reason for the enhanced electrocatalytic activity of TCP, which can give rise to larger electrochemical active surface area , moderate electrochemical resistance and higher oxygen evolution potential (OEP) of TFCP than those of the TF and TCP electrodes. Also, TFCP shows predominant reusability for repeated utilization and desirable wide-applicability for other antibiotics and dyes removal . The degradation pathway has been presumably speculated by analyzing the intermediates. In conclusion, this work paves a novel avenue for the highly efficient electrocatalytic degradation towards antibiotics by introducing the interlayer into the TCP.
研究领域:
环境科学
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电化学
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Jun Hu,Xinze Bian,Yi Xia,Mili Weng,Wan Zhou,Qizhou Dai
In this study, Cu doped PbO 2 electrode was prepared by electrodeposition and used for electrochemical oxidation degradation of amoxicillin (AMX), which showed that the effect of Cu doped PbO 2 electrode was better than that of undoped PbO 2 electrode in degrading amoxicillin. An optimized model was setup with the help of response surface method (RSM). The optimal values of experimental parameters and the interactions between the parameters were explored, including current density, pH and initial AMX concentration. The combustion efficiency was calculated in the electrochemical oxidation of amoxicillin in aqueous solution and the enhancement was found with Cu doped PbO 2 electrode. The enhanced mechanism with Cu doped PbO 2 electrode was discussed based on the analysis of hydroxyl radicals and the combustion efficiency. The mechanism of amoxicillin degradation was discussed. This paper can provide basic data and technique reference for amoxicillin pollution control.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 10
·106510
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IF 4.316
Yijing Xia,Yan Yan,Lingbing Hu,Qizhou Dai,Xiangjuan Ma,Juqing Lou,Yi Xia
This study focused on the enhanced mechanism of electrochemical degradation of antibiotic norfloxacin (NOR) using a self-made Ti/SnO2-Sb2O3/α,β-Co-PbO2 electrode. The electrode characterization, reaction mechanism, degradation performance, and toxicity assessment were studied. In contrast to the conventional Ti/SnO2-Sb2O3/α,β-PbO2 electrode, our prepared Co-doped PbO2 electrode showed the characteristics of more compact surface, smaller crystal size, higher oxygen evolution potential (OEP) and an increased yield of ·OH concentration. The application of Co-doped PbO2 electrode for the electrochemical oxidation of NOR was systematically analyzed. The optimal operating parameters were found to be Na2SO4 concentration of 0.1 mol L−1, initial NOR concentration of 50 mg L−1, initial pH of 5 and current density of 20 mA cm−2. Under these conditions, NOR, chemical oxygen demand (COD) and total organic carbon (TOC) removals reached 85.29%, 43.65% and 41.89% after 60 min of electrolysis, respectively. Through the intermediates detected during the electrochemical treatment process, a reaction pathway involving decarboxylation, defluorination and piperazine ring-opening was proposed. Finally, the toxicity assessment of the treated NOR solution towards Vibrio fischeri rapidly fell to non-toxicity and even reached to negative values after 50 min of electrolysis, indicating that electrochemical oxidation of NOR is an effective approach to reduce its toxicity to environmental ecosystem.
研究领域:
环境科学
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电化学工程
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
Jianmeng Chen,Yijing Xia,Qizhou Dai
This study presents an electrochemical method for the degradation of chloramphenicol (CAP) in aqueous solution with a novel Al doped PbO 2 electrode. The Al-doped PbO 2 electrode showed high electrochemical activity, oxygen evolution potential, radical utilization rate, reusability and safety. The influence factors on CAP degradation with the Al-doped PbO 2 electrode were investigated in detail, and under the optimal conditions the removal rates of CAP and TOC reached 87.30% and 52.06% in acid conditions after 2.5 h electrolysis with a 0.2 mol dm −3 Na 2 SO 4 at a current density of 30 mA cm −2 , respectively. The electrochemical degradation of CAP at Al-doped PbO 2 electrode electrode followed pseudo-first-order kinetics. The degradation mechanism was proposed by cyclic voltammograms tests and it was deduced that hydroxyl radicals generated in the electrochemical process played a key role in oxidizing CAP. Finally, based on the reaction products identified, a possible degradation pathway including radical reaction, ring open and mineralization was proposed.
研究领域:
环境科学
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电化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）