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首页> 外文期刊>Separation and Purification Technology >Morphology and crystal facet-dependent activation mechanism of persulfate by V2O5 nanomaterials for organic pollutants degradation
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Morphology and crystal facet-dependent activation mechanism of persulfate by V2O5 nanomaterials for organic pollutants degradation

机译：V2O5纳米材料对有机污染物的外硫酸盐的形态和晶体刻面相激活机制降解

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摘要

Vanadium pentoxide (V2O5) including nanorod-like V2O5 (V-R), nanowire-like V2O5 (V-S) and nanospheres (V-S) were synthesized by simple hydrothermal methods and then used as heterogeneous catalysts for persulfate activation. A series of characterization containing XRD, XPS, SEM, TEM and BET tests confirmed the different exposed crystal facets, morphologies and specific surface areas for the three kinds of V2O5 catalysts. The experimental results demonstrated that the combination of persulfate with V2O5 was efficient in promoting the degradation of acid orange 7 (AO7). The three types of V2O5 exhibited different abilities to activate persulfate (PS) for AO7 degradation with a sequence of V-W > V-S > V-R, which is probably caused by the larger specific surface area (similar to 30.428 m(2) g(-1)) and the exposed crystal facet (111) with lower Fermi energy and higher positive charge densities for V-W. Free radical quenching and ESR studies revealed that both sulfate radical (SO4-center dot) and hydroxyl radical ((OH)-O-center dot) contributed to AO7 degradation. Furthermore, the prepared catalysts exhibited excellent recyclability and stability.
机译：通过简单的水热方法合成包括纳米棒状V2O5（V-R），纳米线类似V2O5（V-S）和纳米球（V-S）的钒五氧化钒（V2O5），然后用作过硫酸盐活化的非均相催化剂。含有XRD，XPS，SEM，TEM和BET测试的一系列表征证实了三种V2O5催化剂的不同暴露的晶面，形态和比表面积。实验结果表明，具有V2O5的过硫酸盐的组合在促进酸橙7（AO7）的降解方面有效。三种类型的V2O5表现出不同的能力，用于用VW> Vs> VR序列激活过硫酸盐（PS），其可能由较大的比表面积（类似于30.428m（2）G（-1） ）和暴露的晶面（111）具有较低的费米能量和较高的VW正电荷密度。自由基淬火和ESR研究表明，硫酸盐自由基（SO 4中心点）和羟基（（OH）-O-中心点）有助于AO7降解。此外，制备的催化剂表现出优异的可回收性和稳定性。

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