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Electrochemically generated sulfate radicals by boron doped diamond and its environmental applications
Current Opinion in Solid State & Materials Science ( IF 11.0 ) Pub Date : 2021-03-30 , DOI: 10.1016/j.cossms.2021.100921
G. Divyapriya , P.V. Nidheesh

Oxidation of recalcitrant organic contaminants via the electrogenerated sulfate radicals (SO4radical dot) with boron doped diamond (BDD) electrode is one of the most efficient techniques. In this review, fundamental mechanisms of sulfate (SO42−), persulfate (PS, S2O82−) and peroxymonosulfate (PMS, HSO5−) activation with BDD anode and its environmental applications are discussed. Significance of BDD electrode properties such as sp3/sp2 ratio, doping agents and substrate material, and the influence of electrolyte medium, current density and the presence of other inorganic ions (chloride, carbonate, nitrate, phosphate) on the electrogeneration of reactive sulfate species and its reactivity is comprehended as followingly, (i) BDD-sulfate process explains the fundamental reaction mechanisms involving in the electrogeneration of SO4radical dotand S2O82− via radical and non-radical routes, (ii) electrochemical activation of electrogenerated/externally added PS and PMS via the direct/indirect pathways and its promotional reactions are detailed, and (iii) mode of reactivity of the electrogenerated reactive sulfate species with organic contaminants in synthetic and real water, wastewater and soil matrices is elaborated. Most of the studies reported the activation of SO42− at current densities ≥10 mA cm−2, and the energy consumption in the range of 41–190 kW h m−3 was reported for the treatment (95–100% removal efficiency) of high organic content real wastewaters. In later section, the importance of coupling other processes such as electrogeneration of H2O2, UV irradiation, and membrane distillation with BDD/sulfate system to enhance the performance efficiency is discussed. Future perspectives of the research and application is presented at the end.



中文翻译:

掺硼金刚石电化学生成的硫酸根及其环境应用

通过电致硫酸自由基顽固的有机污染物的氧化(SO 4 激进点- )与硼掺杂金刚石(BDD)电极是最有效的技术之一。在这篇综述中,讨论了用BDD阳极活化硫酸盐(SO 4 2-),过硫酸盐(PS,S 2 O 8 2-)和过氧一硫酸盐(PMS,HSO 5-)的基本机理及其在环境中的应用。BDD电极特性(例如sp 3 / sp 2)的意义比率,掺杂剂和基质材料,以及电解质介质,电流密度和其他无机离子(氯离子,碳酸根,硝酸根,磷酸根)的存在对活性硫酸盐物种及其反应性的电化的影响如下: )BDD-硫酸盐过程说明在SO的electrogeneration涉及基本反应机理4 激进点-和S 2 ö 8 2-通过自由基和非自由基途径,(ii)详细介绍了通过直接/间接途径对电生成/外部添加的PS和PMS的电化学活化及其促进反应,以及(iii)电生成的反应性硫酸盐物种与有机污染物的反应方式在合成水和实际用水中,对废水和土壤基质进行了详细说明。大多数研究报告了在电流密度≥10mA cm -2时SO 4 2-的活化作用,据报道该处理的能耗在41-190 kW h m -3范围内(去除效率95-100%)高有机含量的真实废水。在后面的部分中,耦合其他过程(如H 2 O 2的发电)的重要性讨论了BDD /硫酸盐体系的UV辐射和膜蒸馏,以提高性能效率。最后介绍了研究和应用的未来前景。

更新日期:2021-03-31
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