An upgraded electro-Fenton treatment of wastewater using nanoclay-embedded graphene composite prepared via exfoliation of pencil rods by submerged liquid plasma.
An upgraded electro-Fenton treatment of wastewater using nanoclay-embedded graphene composite prepared via exfoliation of pencil rods by submerged liquid plasma.
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DOI：
10.1016/j.jhazmat.2020.122788
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发表时间：
2020-04
影响因子：
13.6
通讯作者：
J. Senthilnathan;A. Selvaraj;S. A. Younis;Ki‐Hyun Kim;M. Yoshimura
中科院分区：
文献类型：
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作者：
J. Senthilnathan;A. Selvaraj;S. A. Younis;Ki‐Hyun Kim;M. Yoshimura
在这项工作中，在浸没液体等离子体（SLP）过程中，使用两种类型（即4黑（4B）和硬黑（HB））铅笔棒合成了两种类型的电化学电极。在高电势（3kV）电子下，SLP工艺为石墨sp2域的迷失提供了有效的剥离途径，以生产两个具有少量石墨烯层（厚度=4-9层）和在极性/非极性溶液（52-53.1%沉降：4h）中高分散性（<19%沉降：4h）的纳米粘土-石墨烯复合电极。然后使用涂层 Fe3O4 板（作为芬顿催化剂）对林丹的电芬顿 (EF) 降解性能进行评估。因此，4B-和HB-ENcGe电极在0.05 A g-1时表现出高比电容值（473和363F g-1）和优异的三角形充放电模式（1000次循环后电容分别减少< 9%和35%（充电速率：0.2 A g-1））。在 pH 3 和电流密度 6.5mA cm-2 下，4B-ENcGe 相对于 2.5mgL-1 林丹表现出优异的 EF 降解性能（60 分钟后 99.4%）（H2O2 生成能力：2.53mmol.h−1，电流效率：89.4%，稳定性：最多第 5 个循环）。林丹的完全基于 EF 的矿化表明这些电极应该为废水污染物提供具有成本效益的一步式处理。
In this work, two types of electrochemical electrodes were synthesized using two types (i.e., 4 black (4B) and hard black (HB)) of pencil rods during submerged liquid plasma (SLP) process. At high potential (3 kV) electrons, the SLP process offered an effective exfoliation route for the disorientation of the graphite sp2domain to produce two nanoclay-graphene composite electrodes with a few graphene layers (thickness = 4–9 layers) and high dispersibility (< 19% settlement: 4 h) in polar/non-polar solution (52–53.1% settlement: 4 h). Their performance was then evaluated towards the electro-Fenton (EF) degradation of lindane using a coated Fe3O4plate (as Fenton catalyst). Accordingly, both 4B- and HB-ENcGe electrodes showed high specific capacitance values (473 and 363 F g−1) at 0.05 A g−1and excellent triangular charge-discharge patterns (< 9% and 35% reduction of capacitance, respectively after 1000 cycles (charging rate: 0.2 A g-1)). At pH 3 and current density of 6.5 mA cm-2, 4B-ENcGe exhibited superior EF degradation performance (99.4% after 60 min) against 2.5 mg L-1lindane (H2O2generation capacity: 2.53 mmol. h−1, current efficiency: 89.4%, and stability: up to 5th cycles). The complete EF-based mineralization of lindane suggests that these electrodes should offer one-step cost-effective treatment for wastewater contaminants.