CHEMICAL PHYSICS LETTERS
·
2023
·
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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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
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电化学工程
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 3
·449-454
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IF 3.1
Wang Junyao,Hu Xialin,Liu Meichuan,Yin Daqiang
Iodinated trihalomethanes(I-THMs) in drinking water pipelines have attracted wide attention due to their high toxicity. The coexistence of widely present lead dioxide(PbO 2 ) with commonly used disinfectant sodium hypochlorite(NaClO) in drinking water might change the formation characteristics of I-THMs due to the strongly oxidizing properties of PbO 2 . This study investigated the formation of I-THMs during the co-oxidation of natural organic matter including humic acid(HA), extracellular organic matter(EOM), and intracellular organic matter(IOM) of algogenic organic matter by PbO 2 and NaClO. Triiodomethane(CHI 3 ) is the dominant product in the single oxidation system of PbO 2 , whereas trichloromethane (CHCl 3 ), chlorodiiodomethane(CHClI 2 ), and dichloroiodomethane (CHCl 2 I) are the major products in the single NaClO system. In the co-oxidation system, the dominant I-THMs are similar to those in the single NaClO system. However, the CHCl 3 content decreased to 56.4% whereas I-THMs concentrations remained unchanged with the increase of PbO 2 concentration. The main reason is attributed to the reduced residual chlorine content due to the reaction of PbO 2 with NaClO. IOM is more prone to forming I-THMs than HA and EOM due to the specified structures. This study suggested that PbO 2 in the drinking water supply pipelines might change the risk of THMs.
研究领域:
环境科学
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饮用水安全
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
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IF 6.9
Yubin Sun,Shuming Wen,Qicheng Feng,Yanyu Tang,Yongchao Miao,Xu Wang,Zhihao Shen
This work explored the application of sodium lauroyl sarcosinate (SLAS) as a green surfactant in rutile flotation systems. A detailed examination of the flotation behavior and adsorption characteristics of rutile was conducted, particularly under Pb 2+ ion-modified conditions. The experimental methodology incorporated multiple analytical techniques: micro-flotation experiments, surface potential analysis, adsorption quantification, FTIR spectroscopy, SEM-EDS characterization, XPS surface analysis, and computational DFT simulations. Micro-flotation experiments demonstrated that under the optimal conditions (SLAS concentration of 2.8 × 10 −4 mol/L, pH 3), a rutile recovery of 81.49 % was obtained. Notably, as the pH increased, the recovery of rutile exhibited a decreasing trend. Following Pb 2+ modification (8.0 × 10 −5 mol/L) combined with SLAS treatment (2.8 × 10 −4 mol/L), the rutile demonstrated consistent flotation recovery exceeding 90.02 % across a broad pH range (3 ∼ 7). The adsorption capacity experiments and SEM-EDS results indicated that multiple SLAS layers were adsorbed on the rutile. Moreover, Pb 2+ modification improved the favorability of SLAS adsorption. A combination of surface potential measurements and infrared spectroscopy confirmed the chemical adsorption mechanism of SLAS on positively charged rutile surface atoms. XPS characterization confirmed that the SLAS oxygen atoms chemically bonded with the rutile surface Ti/Pb atoms. DFT simulations demonstrated that the adsorption processes were spontaneous, with Pb 2+ and SLAS respectively, forming O − Pb and Ti − O bonds on the (110) surface. This mechanism explains how Pb 2+ enhances the SLAS adsorption capacity and subsequent flotation efficiency of the rutile. These studies proved the industrial potential of environmentally friendly collector SLAs in rutile flotation.
研究领域:
矿物加工工程
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表面化学
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计算化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Zhengting Zhang,Guiyun Yi,Peng Li,Xikui Wang,Xiaodong Wang,Chuanxiang Zhang,Yulong Zhang,Qi Sun
Herein, a novel europium/graphene oxide/lead oxide (Eu/GO/PbO 2 ) composite based anode with excellent electrocatalytic performance towards degradation of hydroquinone was prepared by a facile co-electrodeposition method. The composition and micromorphology of the anode was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) and the results confirmed that europium (Eu) and graphene oxide (GO) were successfully composited with PbO 2 and a more compact structure was obtained, which was conductive to enhancing the corrosion resistance of the electrode. Besides, electrochemical measurements indicated that Eu/GO/PbO 2 electrode possessed longer service lifetime (87 h), higher oxygen evolution potential (2.64 V), and lower charge transfer resistance (41.08 Ω) than GO/PbO 2 and pure PbO 2 electrode. The promoted electrocatalytic activity of Eu/GO/PbO 2 electrode was ascribed to its stronger hydroxyl radical generation ability, more active sites and lower electron transfer resistance. Additionally, effects of initial hydroquinone concentration, applied current density and initial pH value on the degradation performance of Eu/GO/PbO 2 anode were systematically investigated. The behind degradation mechanism of hydroquinone by Eu/GO/PbO 2 anode was speculated on the basis of the major intermediates identified by high performance liquid chromatography-mass spectrometer (HPLC-MS). Under the continuous attack of free hydroxyl radicals, hydroquinone was finally decontaminated into CO 2 and H 2 O. The present work demonstrated that Eu/GO/PbO 2 composite anode exhibited excellent degradation performance towards hydroquinone.
研究领域:
环境科学
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材料科学
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电化学
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DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Zeyi Wang,Rong Su,Maojie Zhao,Luyao Zhang,Lu Yang,Feng Xiao,Weishan Tang,Lichuan Chen,Ping He,Dingming Yang
The application of PbO 2 for electrochemical oxidation technology is limited by its low electrocatalytic activity and short service life. Herein, based on the facile one-step electrodeposition , we prepared a boron carbide (B 4 C) and cerium (Ce) co-modified Ti/PbO 2 (Ti/PbO 2 –B 4 C–Ce) electrode to overcome these shortcomings. Compared with Ti/PbO 2 electrode, the denser surface is displayed by Ti/PbO 2 –B 4 C–Ce electrode. Meanwhile, electrochemical characterization indicates that the introduction of B 4 C and Ce significantly enhance the electrochemical performance of PbO 2 electrode. In degradation experiments, under optimized conditions (current density 20 mA cm −2 , pH 9, 0.15 M Na 2 SO 4 and 30 °C), the fully degradation of tetracycline (TC) can be completed within 30 min. Furthermore, the trapping experiment demonstrates that ∙OH and SO 4 ·- radicals have a synergistic effect in the degradation process of TC. Based on results of liquid chromatography-mass spectrometer, the generated ·OH preferentially attacks amides, phenols and conjugated double bond groups in TC. Importantly, Ti/PbO 2 –B 4 C–Ce electrode maintains a constant degradation efficiency even after 10 recycling tests, and its service life is 2.4 times of traditional Ti/PbO 2 electrode. Hence, Ti/PbO 2 –B 4 C–Ce electrode is a promising electrode for degradation of organic wastewater containing amides, phenols, and conjugated double bond groups.
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
ChemElectroChem
·
2022
·Vol. 9
·期 22
·e202200919
·
IF 4.782
Qiuyang Yu,Xiaohong Hu
Graphical O 3 generation : By adjusting the concentration of sodium hydroxide during hydrothermal preparation process, the phase and size-controlled synthesis of PbO 2 was achieved. Later, a phase/size effect in electrochemical ozone generation reaction was found and an optimal PbO 2 microsphere catalyst was successfully screened out. This achieved a 61 % higher O 3 current efficiency at 2 A cm −2 than electrochemically prepared PbO 2 -based catalyst. Traditional electrochemically prepared lead dioxide (e-PbO 2 ) is one of the most used electrode materials for electrochemical ozone production (EOP), because of its high catalytic activity, excellent electrical conductivity, relative stability and low cost. But the electrochemically prepared conditions are complicated and harsh. Bulk PbO 2 electrodes have the very limited surface area and are inconvenient to process into the fine film electrodes for a PEM electrolyser. In contrast, chemical synthesis is easy to prepare uniform PbO 2 catalysts with high surface area and catalytic activity. Here, a facile one-pot approach to prepare a highly active PbO 2 microsphere catalyst was established and used for the EOP reaction in a PEM ozone generator. Sodium hydroxide could be used to regulate the relative content of α/β allotropic phase and crystallite size of PbO 2 microspheres. Experiment results revealed that high β phase content and large β-PbO 2 crystallite size were beneficial to the high EOP activity. By optimizing the composition and crystal structure, chemically prepared PbO 2 could have much better EOP performance than e-PbO 2 .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
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IF 3.235
Xiezhen Zhou,Siqi Liu,Hongxia Yu,Anlin Xu,Jiansheng Li,Xiuyun Sun,Jinyou Shen,Weqing Han,Lianjun Wang
A highly ordered three-dimensional macro-porous PbO 2 (3D porous PbO 2 ) electrode has been prepared for electrochemical oxidation of nitrogen-heterocyclic compounds. The 3D porous PbO 2 electrode was fabricated by templated electrochemical deposition method with TiO 2 nanotube arrays as substrate and SnO 2 -Sb as intermediate layer. The morphology and composition characterization of the 3D porous PbO 2 electrode was performed by field emission scanning electron microscopy and X-ray diffraction, which revealed a uniform distribution of highly ordered macro-porous β-PbO 2 structure. The Brunner−Emmet−Teller analysis suggested the electrode possessed large specific surface area of 37.39 m 2 ·g −1 . Electrochemical measurements indicated the electrode had a favourable oxygen evolution potential of 1.89 V and inner voltammetric charge of 14.48 mC·cm −2 , which were higher than that of conventional PbO 2 electrode. Furthermore, the electrochemical oxidation and TOC removal percentage of pyrrole , pyrazole and tetrazole obtained by 3D porous PbO 2 electrode were 93.4%, 72.7%, 61.2% and 66.7%, 57.3%, 38.6% respectively, which were also superior to conventional PbO 2 electrode. The intermediates were detected and analyzed by high-performance liquid chromatography, gas chromatography-mass spectrometer, and ion chromatography to propose a degradation pathway of pyrrole, pyrazole and tetrazole. Finally, quantum chemical calculation was introduced in this study by density function theory method, which is consistent with the experimental detection.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Wenlan Ji,Yuanjie Xiong,Yuan Wang,Tian C. Zhang,Shaojun Yuan
Dealing with arsenic pollution has been of great concern owing to inherent toxicity of As(III) to environments and human health. Herein, a novel multilayered SnO 2 /PPy/ β -PbO 2 structure on TiO 2 nanotube arrays (TNAs/SnO 2 /PPy/ β -PbO 2 ) was synthesized by a multi-step electrodeposition process as an efficient electrocatalyst for As(III) oxidation in aqueous solution. Such TNAs/SnO 2 /PPy/ β -PbO 2 electrode exhibited a higher charge transfer, tolerable stability, and high oxygen evolution potential (OEP). The intriguing structure with a SnO 2 , PPy , and β -PbO 2 active layers provided a larger electrochemical active area for electrocatalytic As(III) oxidation. The as-synthesized TNAs/SnO 2 /PPy/ β -PbO 2 anode achieved drastically enhanced As(Ⅲ) conversion efficiency of 90.72% compared to that of TNAs/ β -PbO 2 at circa 45.4%. The active species involved in the electrocatalytic oxidation process included superoxide radical (•O 2 − ), sulfuric acid root radicals (•SO 4 − ), and hydroxyl radicals (•OH). This work offers a new strategy to construct a high-efficiency electrode to meet the requirements of favorable electrocatalytic oxidation properties, good stability, and high electrocatalytic activity for As(III) transformation to As(V).
研究领域:
环境科学
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材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Guoquan Zhang,Shaowei Hu,Xiaoyu Zhu,Xiaoxin Hu,Fenglin Yang
An interlocking “ T -shape” structure was built by uniform filling β-PbO 2 crystalline inside the trace Ti 3+ self-doping TiO 2 nanotube arrays (TNAs) channels and depositing the cauliflower-like β-PbO 2 clusters on its upper surface through a facile current pulse deposition method. We elaborated the interfacial engineering strategy for generating compact oxide layers at TNAs bottoms and growing β-PbO 2 crystalline from the selectively conductive TNAs bottoms. Different characterization techniques and electrochemical analyses were conducted to characterize the morphology, structure, and electrochemical property of the β-PbO 2 partial filling/covering TNAs (β-PbO 2 /TNAs/Ti) materials. We also systematically investigated and elucidated the performance and mechanism of β-PbO 2 /TNAs/Ti anode activated peroxymonosulfate (PMS) system via berberine removal/mineralization, reactive oxygen species (ROS) identification/contribution, intermediates analysis, energy consumption and practical applicability estimation. Results illustrated that filling β-PbO 2 inside TNAs can efficiently improve the directional electron-transfer efficiency, oxygen evolution over-potential, tolerance to the varied water matrices and service lifetime of β-PbO 2 /TNAs/Ti anode activated PMS system. The ROS including • OH, S O 4 ∙ - and 1 O 2 that generated from PMS electro-activation are responsible for efficient berberine degradation through two pathways. This study will provide a general approach to construct the versatile tube-filled TNAs-based materials for wide applications in water/wastewater treatment.
研究领域:
环境科学
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材料科学
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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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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2013
·
IF 4.675
Pengran Gao,Yi Liu,Xianfu Bu,Meng Hu,Yuan Dai,Xiaorui Gao,Lixu Lei
Lead acid batteries have been widely used and have dominated the global secondary battery market. It is very important to recycle the spent batteries efficiently to eliminate possible pollution and to ensure sustainable production. In this paper, we report our investigation on the solvothermal treatment of PbO 2 , which is one of the model compounds for the positive active mixture, in methanol and the subsequent calcination of its product. The results show that the solvothermal treatment of PbO 2 in pure methanol at 140 °C can produce a mixture of PbO and lead oxide carbonate, which can be calcined at a temperature below 500 °C to produce α-PbO. The as-prepared PbO powders are rod-like particles of about 0.5 micrometer in diameter and several micrometers in length, which can achieve a high discharge capacity of 165 mAh g −1 at the discharge current density of 5 mA g −1 , and more than 90 mAh g −1 at 200 mA g −1 with excellent cycle stability. This study demonstrates a new way for the reuse of lead dioxide in spent lead acid batteries to produce highly active PbO.
研究领域:
材料科学
·
电化学
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电池技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）