Secondary battery inspired NiO nanosheets with rich Ni(III) defects for enhancing persulfates activation in phenolic waste water degradation
Secondary battery inspired NiO nanosheets with rich Ni(III) defects for enhancing persulfates activation in phenolic waste water degradation
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DOI：
10.1016/j.cej.2018.11.201
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发表时间：
2019-03
影响因子：
15.1
通讯作者：
Dongting Yue;Chao Guo;Xuan Yan;Rilei Wang;Mengyuan Fang;Yunwen Wu;X. Qian;Yixin Zhao
中科院分区：
文献类型：
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作者：
Dongting Yue;Chao Guo;Xuan Yan;Rilei Wang;Mengyuan Fang;Yunwen Wu;X. Qian;Yixin Zhao
硫酸根（自由基 dotSO4−）具有广泛的 pH 耐受性和强氧化能力，有望用于酚类废水的类芬顿反应降解。由于其不合适的氧化还原电位窗口，镍基催化剂及其化合物很少被报道作为过硫酸盐（PDS）硫酸根活化的催化剂。通过 NiOx/NiOx(OH)yredox 循环的充电/放电过程，开发了一种具有丰富 Ni(III) 缺陷的二次电池启发的 NiO 纳米片，用于类芬顿催化。 NiOx/NiOx(OH)y 循环中 Ni(II)/Ni(III) 的氧化还原电位足够高，足以激活 S2O82− 从而生成自由基点 SO4−。富含缺陷的 NiO 纳米片的类芬顿性能在 Co3O4、α-Fe2O3、MnOOH 和 CuO 等众所周知的硫酸根活化催化剂中最为强劲。 NiO的增强作用归因于形成的Ni(III)缺陷，它可以促进Ni(III)向Ni(II)的放电过程，然后在类芬顿过程中增强Ni(III)/Ni(II)循环。还研究了富含缺陷的 NiO 纳米片的稳定性和恢复性。其化学结构的高稳定性有助于在碱性或中性条件下反应过程中镍的浸出率较低。通过退火处理可以轻松实现富含缺陷的 NiO 纳米片的恢复。总而言之，二次电池启发的富含缺陷的氧化镍纳米片具有出色的硫酸根活化作用，将成为一种有前景的类芬顿催化剂，用于环境修复。
Sulfate radicals (radical dotSO4−) with broad pH tolerance and strong oxidation capacity are promising for Fenton-like reaction degradation of phenolic waste water. Ni-based catalysts and its compounds have been seldom reported as catalysts for the sulfate radical activation from persulfates (PDS) due to its inappropriate redox potential windows. A secondary battery inspired NiO nanosheets with rich Ni(III) defects were developed for Fenton-like catalysis via the charge/discharge process of NiOx/NiOx(OH)yredox cycle. The redox potential of Ni(II)/Ni(III) in NiOx/NiOx(OH)ycycle is high enough to activate S2O82−for the generation of radical dotSO4−. The Fenton-like performance of the defect-rich NiO nanosheets is most robust among the well-known sulfate radical activation catalysts of Co3O4, α-Fe2O3, MnOOH, and CuO. The enhancement effect of NiO was attributed to the formed Ni(III) defects, which could facilitate the discharge process of Ni(III) to Ni(II) and then enhance the Ni(III)/Ni(II) cycle during the Fenton-like process. The stability and recovery of defect-rich NiO nanosheets was also studied. Its high stability in chemical structure contributed to the low Ni leaching during the reaction process in basic or neutral condition. The recovery of defect-rich NiO nanosheets could be easily realized via the annealing treatment. In all, the secondary battery inspired defect-rich NiO nanosheets with outstanding sulfate radical activation would be a promising Fenton-like catalyst for environmental remediation.