CHEMICAL PHYSICS LETTERS
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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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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2023
·Vol. 27
·期 10
·2593-2606
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IF 2.5
Li Er-Mei,Zhu Li,Li Chao-Xiong,Shi Ling-Jun,Li Bing,Li Fang,Deng Ning,He Jian-Bo
Stannous sulfate is commonly used as an additive in the positive lead pastes of lead-acid batteries, but its real function and mechanism are still vague and need further study. The present work investigates the intrinsic effects of tin additives on the positive electrode performance under well-controlled experimental conditions. The tin additives are added in three ways: the SnSO 4 dissolved in 4.5 M H 2 SO 4 electrolyte, the metal Sn melted in metal Pb substrate, and the SnSO 4 mixed in homemade industrial lead pastes. A series of evolutions are clearly revealed in structure, composition, and redox activity of the positive active materials with the content of Sn. Both the SnSO 4 in the electrolyte and in the positive lead pastes have a significant inhibiting effect on the transformation between PbSO 4 and PbO 2 , leading to a decrease in the charge/discharge capacities with increasing content of SnSO 4 . A similar but weaker inhibiting effect was also found for the Sn melted in the Pb-Sn alloys. The SnSO 4 has a significant enhancement effect on the grain size of PbSO 4 /PbO 2 , which increases the resistance of the solid-phase transformation deep inside the grains during the charge/discharge. All these results do not support the use of SnSO 4 in the positive pastes of lead-acid batteries. Graphical abstract
研究领域:
材料科学
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电化学
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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
HYDROMETALLURGY
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2020
·
IF 3.338
Xuanbing Wang,Ruidong Xu,Suyang Feng,Chen Chen,Buming Chen
In this paper, a Co 3 O 4 - and CNT-doped 3D PbO 2 electrode was fabricated through galvanostatic electrodeposition in a Pb(Ac) 2 -NH 2 SO 3 H solution, and the electrochemical properties were systematically investigated in a zinc electrolyte. The XRD results show that the deposit is a mixture of an α + β phase (a dominant β-PbO 2 phase with a minor α-PbO 2 phase present), and the SEM images show that Co 3 O 4 and CNT have been simultaneously deposited with PbO 2 . The 3D-Ti/PbO 2 -(4 g·L −1 ) Co 3 O 4 -(0.4 g·L −1 ) CNT electrode exhibits a voltammetric charge 5 times larger than that of the 3D-Ti/PbO 2 electrode, which indicates outstanding electrocatalytic activity. The oxygen evolution reaction overpotential and cell voltage are only 394 mV and 3.74 V at 500 A∙m −2 , respectively. In addition, the obtained electrode showed a high current efficiency of 95.3% and a service life of 26 h under a current density of 20,000 A∙m −2 . Hence, this study offers a facial synthesis route to prepare composite electrodes for zinc electrowinning and provides deep insight into the relationship among doping substances, microstructures and electrocatalytic activity.
研究领域:
材料科学
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电化学
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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
Frontiers in Materials
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2019
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IF 2.689
Liu Min,Li Zhichun,Zheng Weilin,Kong Long,Li Liang
Metal oxides exhibit excellent barrier properties against moisture and oxygen, which are regarded as the powerful candidate for boosting the stability of perovskite nanocrystals (NCs). Here, we develop a simple method to coat perovskite NCs with PbO by peroxides post-treatment. Firstly, the didodecyl dimethyl ammonium sulfide (DDAS) was used to modify the CsPbBr3 NCs (DDAS-CsPbBr3), and then sequentially treated with benzoyl peroxide (BPO). By this way, the self-metal source (lead) can be easily oxidized, leading to the quick growth of lead oxide (PbO) on the surface of individual CsPbBr3 NCs. Under illumination with a 450 nm LED light (175 mW/cm2), the PbO coated CsPbBr3 NCs maintained at ~90% of the initial intensity for 20 h of operations; in contrast, the emission from the CsPbBr3 NCs completely quenched.
研究领域:
材料科学
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化学
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DOI
高影响因子
CHEMOSPHERE
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2023
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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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DOI
PubMed
高影响因子
CHEMOSPHERE
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2023
·
IF 8.8
Cong Li,Suqin Li,Penghui Guo,Yongkui Li,Xingyu Liu
Copper plant residue (CPR) is a hazardous industrial by-product possessing both high toxicity and valuable metal content, necessitating its high value-added utilization. Traditional practices in smelters involve stockpiling and landfilling of CPR, leading to substantial land occupation and water contamination . This study focused on the preparation of PbO and Pb 3 O 4 using the HCl–NaCl leaching–conversion–thermal decomposition process, employing CPR as the primary raw material. The effect of various leaching process conditions on the metal leaching rate was explored. A maximum lead leaching rate of 87.65% was achieved under optimal conditions including leaching temperature, liquid–solid ratio, leaching time, HCl molar concentration, NaCl mass concentration, and particle size. The lead content in the leachate was 15.85 g/L. Experimental data indicated that ash diffusion control served as the rate-limiting step in the HCl–NaCl leaching process. The apparent activation energy was determined to be 18.374 kJ mol −1 , with a reaction order of 0.8986 concerning the HCl concentration and an L/S ratio of 0.8124. Additionally, response surface methodology enabled the determination of technological parameters for refining PbCl 2 into PbCO 3 precursors, yielding a conversion rate exceeding 96.50%. Moreover, the technical indicators of PbO and Pb 3 O 4 obtained through low-temperature thermal decomposition of PbCO 3 were investigated. The fabricated PbO and Pb 3 O 4 exhibited purities of 99.65% and 99.26%, respectively, effectively transforming CPR from hazardous waste residue into valuable products. The process ensures the efficient recovery of lead to its maximum extent and promotes residue recycling .
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
PubMed
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2021
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IF 3.382
Ali Yazdan,Bingkun Hu,Ce-Wen Nan,Liangliang Li
Boron nitride nanotubes (BNNTs) possess many fascinating properties that make them promising for various applications in microelectronics, biomedicine and coating. In this work, BNNTs were synthesized by a ball milling-annealing method. Boron powder was milled with promoters, lead(II) oxide (PbO) and iron(III) nitrate nonahydrate (Fe(NO 3 ) 3 ⋅9H 2 O), under the N 2 gas environment to prepare a precursor. Then, bamboo-like and cylindrical BNNTs were synthesized by annealing the precursor at 1150 °C under the NH 3 gas environment. The phase of the BNNTs was identified to be hexagonal BN by X-ray diffractometry, Raman spectroscopy and transmission electron microscopy . The effect of the promoter content in the precursor on the synthesis of the BNNTs was investigated. When the mass ratio of B:PbO:Fe(NO 3 ) 3 ⋅9H 2 O was 1:1:1, bamboo-like and cylindrical BNNTs with a diameter of 60–500 nm, uniform composition and polycrystalline microstructure were obtained.
研究领域:
材料科学
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纳米技术
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DOI
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
WATER RESEARCH
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2020
·
IF 9.13
Jun Hu,Yiran Xu,Ying Chen,Jiang Chen,Huiyu Dong,Jianming Yu,Zhimin Qiang,Jiajia Qu,Jianmeng Chen
Lead dioxide (PbO 2 ) is an important form of lead mineral scales in drinking water pipes. Iodide (I − ) widely presents in source waters and can be thermodynamically oxidized by PbO 2 to the reactive iodine species (I 2 /HOI). Biofilm extracellular polymeric substances (EPS) are nonnegligible precursors of disinfection byproducts (DBPs). The aim was to study the oxidation of I − by PbO 2 and formation of iodinated DBPs (I-DBPs) from EPS. At a high molar ratio of PbO 2 to I − (> 100), the observed rate constants of I − oxidation decreased as pH increased from 6.0 to 9.0 with an H + dependence of 0.79, and the rate constant ( k ) was 1.6 × 10 11 M −2.79 s −1 . Most of formed I 2 /HOI (> 92%) was transformed to organic iodine in the presence of EPS. EPS had a lower formation potential (FP) of carbonaceous I-DBPs (C-IDBPs), while a higher that of nitrogenous I-DBPs (N-IDBPs) than HA, resulting in a higher Chinese Hamster Ovary cell cytotoxicity. Generally, the formation of I-DBPs decreased with the increase of pH due to the reduction of surface positive charge and electrochemical driving force. PbO 2 dose and I − concentration also had a significant effect on the I-DBPs formation. EPS proteins had a higher FP of both C- and N-IDBPs than polysaccharides on account of more electrophilic sites and higher nitrogen content. In proteins, aspartic acid was the main contributor to triiodomethane and iodoacetic acids formation, whereas aspartic acid, asparagine and tyrosine were the major precursors of diiodoacetonitrile and diiodoacetamide. The study helps to improve the control strategy of I-DBPs when biofilm outbreaks in lead-containing water pipes.
研究领域:
环境科学
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公共卫生
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化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Hao Fu,Guangqiang Liu,Haoming Bao,Le Zhou,Hongwen Zhang,Qian Zhao,Yue Li,Weiping Cai
Lead oxide (PbO) nanosheets are of significance in the design of functional devices. However, facile, green, and fast fabrication of ultrathin and homogenous PbO nanosheets with a chemically clean surface is still desirable. Herein, a simple and chemically clean route is developed for fabricating such nanosheets via laser ablation of a lead target in water for a short time and then ambient aging. The obtained PbO nanosheets are (002)-oriented with microsize in planar dimension and ∼15 nm in thickness. They are mostly hexagonal in shape. Experimental observations of the morphological evolution have revealed that the formation of such PbO nanosheets can be attributed to two processes: (i) laser ablation-induced formation of ultrafine Pb and PbO nanoparticles (NPs) and (ii) PbO NP aggregation and their oriented connection growth. Importantly, a composite surface-enhanced Raman spectroscopy (SERS) chip is designed and fabricated by covering a PbO nanosheet monolayer on a Au NP film. Such a composite SERS chip can be used for the fast and trace detection of gaseous H2S in which the PbO nanosheets can effectively chemically trap H2S molecules, demonstrating a new application of these PbO nanosheets. The response of this chip to H2S can be detected within 10 s, and the detection limit is below 1 ppb. Also, this PbO nanosheet-based chip is reusable by heating after use. This study not only deepens the understanding of the NP-based formation mechanism of nanosheets but also provides the renewable SERS chips for the highly efficient detection of trace gaseous H2S.
研究领域:
材料科学
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化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
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