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A highly dispersed Co–Fe bimetallic catalyst to activate peroxymonosulfate for VOC degradation in a wet scrubber
Environmental Science: Nano ( IF 7.3 ) Pub Date : 2021-08-10 , DOI: 10.1039/d1en00547b
Xiaowen Xie 1 , Ruijie Xie 1 , Ziyi Suo 1 , Haibao Huang 1, 2, 3 , Mingyang Xing 4 , Dongxue Lei 1
Affiliation  

Peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) are emerging methods for VOC waste gas treatment, but the activation of PMS via heterogeneous metal catalysts is greatly limited by the low dispersion of active components. In this work, a highly dispersed Co–Fe bimetallic catalyst using uncalcined SBA-15 as the support (CFS) was successfully prepared by a simple one-step calcination method. The abundant Si–OH groups and nanoconfined space provided by uncalcined SBA-15 were responsible for the dispersion behavior of Co–Fe species. Simultaneously, the doping of Fe in CFS can greatly enhance the Co stability in the channels of SBA-15 and prevent Co ion leaching in reaction media. The prepared CFS can be stored for 3 months with almost no loss of activity. Compared with CFS, the Co–Fe catalyst derived from template free SBA-15 (CFCS) showed aggregated particles with much lower dispersion. CFS showed superior catalytic activity towards PMS activation and VOC degradation in a wet scrubber. The toluene removal efficiency over CFS was kept above 95% while it was only 62%, 30% and 42% over CFCS, Co/SBA-15 and Fe/SBA-15, respectively. The powerful hydroxyl (HO˙) and sulfate (SO4˙) radicals were abundantly generated to oxidize toxic VOCs including toluene, styrene and chlorobenzene into soluble small molecules, which could be finally mineralized into CO2. The highly dispersed Co–Fe nanoparticles developed in this study not only show outstanding activity for PMS activation in AOPs, but also greatly reduce the environmental risk from Co leaching and emission of toxic VOCs and their by-products.

中文翻译:

一种高度分散的 Co-Fe 双金属催化剂,用于活化过硫酸盐以在湿式洗涤器中降解 VOC

基于过氧单硫酸盐 (PMS) 的高级氧化工艺 (AOP) 是 VOC 废气处理的新兴方法,但 PMS通过非均相金属催化剂受到活性组分低分散性的极大限制。在这项工作中,使用未煅烧的 SBA-15 作为载体(CFS)通过简单的一步煅烧方法成功制备了一种高度分散的 Co-Fe 双金属催化剂。由未煅烧的 SBA-15 提供的丰富的 Si-OH 基团和纳米限制空间是 Co-Fe 物种分散行为的原因。同时,在 CFS 中掺杂 Fe 可以大大提高 SBA-15 通道中 Co 的稳定性,防止 Co 离子在反应介质中浸出。制备好的 CFS 可以存放 3 个月,几乎没有活性损失。与 CFS 相比,源自无模板 SBA-15 (CFCS) 的 Co-Fe 催化剂显示出分散性低得多的聚集颗粒。CFS 在湿式洗涤器中对 PMS 活化和 VOC 降解显示出优异的催化活性。CFS 的甲苯去除效率保持在 95% 以上,而 CFCS、Co/SBA-15 和 Fe/SBA-15 的甲苯去除率分别仅为 62%、30% 和 42%。强大的羟基 (H2O˙) 和硫酸盐 (SO4 ˙ - ) 自由基大量产生,将甲苯、苯乙烯和氯苯等有毒 VOC 氧化成可溶性小分子,最终可矿化成 CO 2。本研究中开发的高度分散的 Co-Fe 纳米粒子不仅在 AOP 中显示出出色的 PMS 活化活性,而且大大降低了 Co 浸出和有毒 VOC 及其副产物排放的环境风险。
更新日期:2021-09-01
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