Unveiling the catalytic ability of carbonaceous materials in Fenton-like reaction by controlled-release CaO2 nanoparticles for trichloroethylene degradation.
Unveiling the catalytic ability of carbonaceous materials in Fenton-like reaction by controlled-release CaO2 nanoparticles for trichloroethylene degradation.
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DOI：
10.1016/j.jhazmat.2021.125935
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发表时间：
2021-04
影响因子：
13.6
通讯作者：
Meesam Ali;M. Tariq;Yongzhen Sun;Jingyao Huang;Xiaogang Gu;S. Ullah;M. Nawaz;Zhengyuan Zhou
中科院分区：
文献类型：
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作者：
Meesam Ali;M. Tariq;Yongzhen Sun;Jingyao Huang;Xiaogang Gu;S. Ullah;M. Nawaz;Zhengyuan Zhou
碳质材料(CMS)已被广泛应用于提高环境催化剂的催化性能，但对CMS修复地下水的自催化机理研究较少。在这里，我们揭示了不同的CMS通过聚乙烯醇包覆的纳米过氧化钙(PVA@NCP)还原Fe(III)来催化去除三氯乙烯(TCE)的能力。在所选择的CMS(石墨(G)、生物炭(BC)和活性碳(AC))中，BC和AC通过吸附和催化降解对TCE的去除分别提高了89%和98%。BET和扫描电子显微镜分析表明，AC的吸附容量较高(27.8%)。溶液Fe(II)和表面Fe(II)的生成揭示了Fe(III)在CMS表面的还原。用FTIR技术研究了含氧基团的作用，XPS定量测定了BC和AC体系中52%和57%的表面Fe(II)。EPR和猝灭实验证实，溶液和表面结合物种(HO·、O2−·和1O2)对三氯乙烯的降解都有贡献。酸性pH条件有利于三氯乙烯的去除，与其他无机离子相比，HCO3-−的存在对三氯乙烯的去除有负面影响。这两个方案(PVA@NCP/Fe(III)/BC和PVA@NCP/Fe(III)/AC)在实际地下水、表面活性剂修正溶液和去除其他氯化污染物方面都显示出良好的效果，为实现长期效益的绿色环境修复开辟了新的方向。
Carbonaceous materials (CMs) have been applied extensively for enhancing the catalytic performance of environmental catalysts, however, the self-catalytic mechanism of CMs for groundwater remediation is rarely investigated. Herein, we unveiled the catalytic ability of various CMs via Fe(III) reduction through polyvinyl alcohol-coated calcium peroxide nanoparticles (PVA@nCP) for trichloroethylene (TCE) removal. Among selected CMs (graphite (G), biochar (BC) and activated carbon (AC)), BC and AC showed enhancement of TCE removal of 89% and 98% via both adsorption and catalytic degradation. BET and SEM analyses showed a higher adsorption capacity of AC (27.8%) than others. The generation of solution-Fe(II) and surface-Fe(II) revealed the reduction of Fe(III) on CMs-surface. The role of O-containing groups was investigated by the FTIR technique and XPS quantified the 52% and 57% surface-Fe(II) in BC and AC systems, respectively. EPR and quenching tests confirmed that both solution and surface-bound species (HO•, O2−• and1O2) contributed to TCE degradation. Acidic pH condition encouraged TCE removal and the presence of HCO3−negatively affected TCE removal than other inorganic ions. Both schemes (PVA@nCP/Fe(III)/BC and PVA@nCP/Fe(III)/AC) exhibited promising results in the actual groundwater, surfactant-amended solution, and removal of other chlorinated-pollutants, opening a new direction towards green environmental remediation for prolonged benefits.