Hierarchically porous structure of two-dimensional nano-flakes assembled flower-like NiO promotes the formation of surface-activated complex during persulfate activation
Hierarchically porous structure of two-dimensional nano-flakes assembled flower-like NiO promotes the formation of surface-activated complex during persulfate activation
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二维纳米片组装花状NiO的分级多孔结构促进过硫酸盐活化过程中表面活化复合物的形成
DOI：
10.1016/j.cej.2021.133134
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发表时间：
2021-10
影响因子：
15.1
通讯作者：
Juan Xu
中科院分区：
文献类型：
--
作者：
Lu-Lu Zhou;Peng-Xi Liu;Ying Ding;Jia-Rui Xi;Li-Juan Liu;Wei-Kang Wang;Juan Xu
具有分层多孔结构的多相催化剂是催化化学反应的高效催化剂。在这项工作中，制备了二维（2D）纳米薄片组装成花朵状的NiO，并利用它来激活过硫酸氢盐（PDS）来降解有机污染物双酚A （BPA）。结果表明，所制备的催化剂呈现出由均匀的二维纳米薄片组成的有序花结构。PDS与催化剂结合形成表面活化的NiO-PDS复合物，随后从BPA中剥夺电子。优化后的NiO-12催化剂具有较大的比表面积和分层多孔结构，有利于暴露丰富的活性位点，而低电阻有利于电子转移，在初始浓度为20 mg/L的条件下，BPA的降解速率常数高达0.28 min−1。NiO-12具有催化PDS矿化34%实际包装废水的能力。本研究提供了一种制备分级二维多孔过硫酸盐活化催化剂的新策略，在实际废水处理中具有应用潜力。
Heterogeneous catalysts with hierarchically porous structure are highly efficient to catalyze chemical reactions. In this work, two-dimensional (2D) nano-flakes assembled flower-like NiO is fabricated and utilized for activating peroxydisulfate (PDS) to degrade organic pollutants bisphenol A (BPA). The results demonstrate that the prepared catalyst exhibits well organized flower structure composed of uniform 2D nano-flakes. PDS combines with the catalyst to form surface-activated NiO-PDS complex, subsequently depriving electrons from BPA. For the optimized NiO-12 catalyst, large specific surface area and hierarchically porous structure benefit to exposes abundant active sites while low resistance promotes electrons transfer, bringing the high BPA degradation rate constant of 0.28 min−1under the condition of 20 mg/L initial concentration. NiO-12 exerts a capability of catalyzing PDS to mineralize 34% of practical packaging wastewater. This study provides a new strategy to fabricate hierarchical 2D porous catalysts for persulfate activation, with application potential in practical wastewater treatment.
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