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Prussian Blue Microcrystals with Morphology Evolution as a High-Performance Photo-Fenton Catalyst for Degradation of Organic Pollutants
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-12-17 00:00:00 , DOI: 10.1021/acsami.8b14987
Na Wang 1 , Wenjie Ma 1 , Yunchen Du 1 , Ziqiu Ren 1 , Binhua Han 1 , Leijiang Zhang 1 , Bojing Sun 1 , Ping Xu 1 , Xijiang Han 1
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The morphology-dependent property of crystal materials has aroused extensive attention and raised high requirements for subtly tailoring the morphology of micro-/nanocrystals. Herein, we develop an in situ etching method for preparation of Prussian blue (PB) microcrystals with morphology evolution by progressively increasing the concentration of chloroplatinic acid in the reaction system. These PB microcrystals with controllable morphologies are employed as photo-Fenton reagents to degrade organic pollutants. PB hexapods (PB-hpds) and PB hexapod stars present superior catalytic performance to pristine PB microcubes and other PB intermediates with truncated corners or edges because of their high specific surface areas and adequate exposure of FeIII–NC coordination active sites. In the reusability test, the reused PB-hpds present more efficient catalytic performance for rhodamine B decomposition compared with the pristine catalyst. According to more investigations, the reasonable mechanism is proposed that FeIII–NC exhibits higher catalytic activity than FeII–CN in the specific coordination environment. The increased content of surface FeIII–NC coordination active sites is the key factor in accelerating the decomposition of H2O2 and enhancing the photo-Fenton performance of PB-hpds. Several operating parameters including catalyst dosage, H2O2 concentration, pH value, and reaction temperature are evaluated in detail. Classical quenching experiments and electron paramagnetic resonance measurements further reveal that HO should be responsible for high performance of catalysts. This work will be significant for tailoring the morphology of the materials and arousing more attention to enhance the stability and reusability of catalysts.

中文翻译:

具有形态演化的普鲁士蓝微晶作为降解有机污染物的高性能光芬顿催化剂

晶体材料的形态依赖特性引起了广泛的关注,并提出了对微调纳米/纳米晶体的形态进行精细调整的高要求。本文中,我们通过逐步增加反应体系中氯铂酸的浓度,开发了一种原位刻蚀方法,用于制备具有形态演化的普鲁士蓝(PB)微晶。这些具有可控形态的PB微晶被用作光芬顿试剂以降解有机污染物。PB六足星(PB-hpds)和PB六足星由于其高比表面积和充足的Fe III暴露,比原始的PB微立方和其他具有截角或边缘的PB中间产物表现出优异的催化性能。–NC协调活动站点。在可重用性测试中,与原始催化剂相比,重用的PB-hpds对若丹明B的分解表现出更有效的催化性能。根据更多的研究,提出了合理的机理,即在特定的配位环境下,Fe III -NC的催化活性高于Fe II -CN的催化活性。表面Fe III -NC配位活性位点含量的增加是加速H 2 O 2分解并增强PB-hpds的光芬顿性能的关键因素。几个操作参数,包括催化剂用量,H 2 O 2详细评估浓度,pH值和反应温度。经典的猝灭实验和电子顺磁共振测量结果进一步表明,HO 应该对催化剂的高性能负责。这项工作对于定制材料的形态和引起更多关注以增强催化剂的稳定性和可重复使用性具有重要意义。
更新日期:2018-12-17
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