Potential of Iron Pillared Clay as Active Nanocatalyst for Rapid Decolorization of Methylene Blue

Lal hmunsiama, Seung-Mok Lee
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Abstract

In this study, the iron-pillared clay nanocatalyst (ICN) was employed as a nanocatalyst for decolorization of methylene blue (MB) in aqueous solutions without hydrogen peroxide. The changes in clay structure after the incorporation of iron-oxide particles was studied with the help of XRD analytical data. The SEM micrographs showed higher heterogeneous structure of ICN compared to pristine clay and the specific surface area of ICN (82.54 m2/g) is considerably higher than the unmodified clay (63.41 m2/g). Further, the EDX analytical data indicate the successful incorporation of iron-oxide into bentonite clay. Batch experiments showed that ICN could degrade MB within pH 3.0 to 11.0 and it is efficient even at higher concentrations. The degradation is very fast and more than 90% is removed within 30 mins. A small amount of ICN is effective for degradation of MB and the reusability test showed that ICN can be reuse for several times for the degradation of MB in aqueous solutions. The effect of scavengers studies indicate that the ·OH radicals generated from the ICN are responsible in the degradation of MB. This study indicates that ICN must be low cost and environmentally friendly active nanocatalyst for degradation of MB present in aquatic environment.
铁柱粘土作为亚甲基蓝快速脱色活性纳米催化剂的潜力
本研究采用铁柱粘土纳米催化剂(ICN)作为纳米催化剂,在无过氧化氢的水溶液中对亚甲基蓝(MB)进行脱色。利用XRD分析数据研究了氧化铁颗粒掺入后粘土结构的变化。SEM显微图显示,ICN的非均质结构高于原始粘土,ICN的比表面积(82.54 m2/g)明显高于未改性粘土(63.41 m2/g)。此外,EDX分析数据表明氧化铁成功掺入膨润土粘土中。批量实验表明,ICN在pH 3.0 ~ 11.0范围内可降解MB,在更高的浓度下也能有效降解MB。降解非常快,30分钟内可去除90%以上。少量ICN对MB的降解是有效的,可重复使用试验表明,ICN可多次重复使用以降解水溶液中的MB。清除剂的作用研究表明,ICN产生的·OH自由基参与了MB的降解,表明ICN必须是一种低成本、环保的活性纳米催化剂才能降解水生环境中的MB。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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