砷（III/V）在多协同（氧化还原-光电化学-ROS）铝取代铜铁氧体浸渍 rGO 上的吸附和电吸机理的研究进展。
Insights of arsenic (III/V) adsorption and electrosorption mechanism onto multi synergistic (redox-photoelectrochemical-ROS) aluminum substituted copper ferrite impregnated rGO.
机构信息
Advanced Nanoengineering Materials Laboratory, Indian Institute of Technology Kanpur, Kanpur, 208016, India; Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India; Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
Advanced Nanoengineering Materials Laboratory, Indian Institute of Technology Kanpur, Kanpur, 208016, India; Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur, 208016, India.
出版信息
Chemosphere. 2021 Mar;267:129246. doi: 10.1016/j.chemosphere.2020.129246. Epub 2020 Dec 7.
The understanding of mechanistic insights in environmental remediation and mitigation systems is attracting larger attention, in recent days. Here in, aluminium substituted copper ferrite impregnated rGO hybrid (CAF-rGO) is verified to understand the adsorption/electrosorption mechanism of arsenic in aqueous systems. Near-surface study (XPS: As 3d, Cu 2p, Fe 2p, Al 2p, O 1s, C 1s) proposes redox, and ligand exchange reactions between contaminant, and CAF-rGO. Adsorption capacities are observed around 128.8 mg g [As(III)], 153.5 mg g [As(V)] with Freundlich model isotherms. Kinetics study follows the PSO model with influence of solar light (> 420 nm). Cyclic voltammetry (CV) analysis in different molarity conditions observed with signals around +0.1 and -0.6 V confirm the redox abilities, and N/O purged environments understood that electrosorption occurred through both reduction and sorption. Electrosorption study with pH variation shows the effect of protonation on the redox activity of individual arsenic species. Consistent signal around -0.6 ± 0.05 V in all the CV plots (i.e., Molarity, Environment, pH) recommends the usage of CAF-rGO for arsenic mitigation. Possible influence of photo-current (∼40 μA/cm at ∼ 0 V) towards As(III/V) decontamination is understood though photoelectrochemical analysis. Impedance plot shows low-resistance and better diffusion of arsenic oxy-anions during light irradiation. Synergistic nature of CAF-rGO generates reactive oxygen species (i.e., OH/O/O) in mitigating highly toxic As(III) species is also detailed in the present work.
近年来，人们越来越关注环境修复和缓解系统中机械理解的作用。在这里，我们验证了铝取代铜铁氧体浸渍还原氧化石墨烯杂化材料（CAF-rGO）在水溶液中吸附/电吸附砷的机理。表面附近的研究（XPS：As 3d、Cu 2p、Fe 2p、Al 2p、O 1s、C 1s）提出了污染物与 CAF-rGO 之间的氧化还原和配体交换反应。吸附等温线符合 Freundlich 模型，吸附容量分别为 128.8mg/g [As(III)]和 153.5mg/g [As(V)]。动力学研究遵循 PSO 模型，并且在太阳光照（>420nm）下有影响。在不同摩尔浓度条件下进行的循环伏安法（CV）分析，观察到约+0.1 和-0.6V 的信号，证实了氧化还原能力，并在 N/O 吹扫环境中理解了通过还原和吸附发生的电吸附。pH 值变化的电吸附研究表明质子化对单个砷物种氧化还原活性的影响。所有 CV 图（即摩尔浓度、环境、pH 值）中约-0.6±0.05V 左右的一致信号表明 CAF-rGO 可用于砷的缓解。光电化学分析表明，在光电化学分析中，光电流（约 0V 时约 40μA/cm）可能对 As(III/V)的去污有影响。阻抗图显示在光照下砷氧阴离子的低电阻和更好的扩散。CAF-rGO 的协同性质也在本工作中详细阐述了其在缓解高毒性 As(III)物种方面产生的活性氧物质（即 OH/O/O）。
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