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Removal of Arsenic from Water Using a Composite of Iron–Manganese Oxide Incorporated Active Rice Husk Silica
Clean - Soil Air Water ( IF 1.5 ) Pub Date : 2021-02-02 , DOI: 10.1002/clen.202000233
Trung Huu Bui 1 , Van Sy Pham 2 , Nguyen Thanh‐Nho 3 , Quoc An Trieu 3
Affiliation  

Low‐cost adsorbents from agricultural by‐products are intensively studied in water treatment, especially in arsenic removal for obtaining safe drinking water. Here, it is reported that a cheap and effective nano‐composite of iron–manganese oxide incorporated active rice husk silica (FMRS) for efficient removal of arsenic (As(III) and As(V)) from water, which is fabricated using a one‐pot synthesis. Fe3+ and Mn4+ in their oxides supported silica structure are successfully characterized. The FMRS (qe = 11.9 mg g−1) shows a remarkable enhancement of arsenic removal compared with the original rice husk ash (qe = 0.4 mg g−1) at initial [As(V)] = 5 mg L−1. The As(III) and As(V) adsorption are in good agreement with both Langmuir and Freundlich non‐linear isotherm models (R2 > 0.98), where the maximum adsorption capacities at pH 7 are found up to 19.1 and 20.3 mg g−1, respectively. The role of Mn4+ in enhancing the As(III) adsorption is also discussed. The FMRS exhibits high selectivity toward arsenic under the influences of other co‐existing anions in water (e.g., chloride, sulfate, and bicarbonate) and sustains a good arsenic removal efficiency during four cycles of the reusability test, suggesting a high potential of the fabricated adsorbent for long‐term removal of arsenic in field application.

中文翻译:

铁锰氧化物结合活性稻壳二氧化硅去除水中的砷

在水处理中,特别是在去除砷以获得安全饮用水方面,对来自农业副产品的低成本吸附剂进行了深入研究。在这里,据报道,一种廉价而有效的掺有铁锰氧化物的活性稻壳二氧化硅(FMRS)纳米复合材料,可从水中有效去除砷(As(III)和As(V)),其制备方法是一锅合成。Fe 3+和Mn 4+以其氧化物支撑的二氧化硅结构得到了成功表征。在初始[As(V)] = 5 mg L时,FMRS(q e  = 11.9 mg g -1)与原始稻壳灰(q e  = 0.4 mg g -1)相比显示出显着的除砷效果。-1。的As(III)和As(V)的吸附是在与两个Langmuir和Freundlich非线性等温线模型(良好的一致性- [R 2  > 0.98),其中在pH为7的最大吸附容量被发现高达19.1和20.3毫克克-分别为1。还讨论了Mn 4+在增强As(III)吸附中的作用。FMRS在水中其他共存阴离子(例如氯离子,硫酸根和碳酸氢根)的影响下对砷具有很高的选择性,并且在四个可重复使用性测试周期中都具有良好的除砷效率,这表明制造的潜力很大。现场应用中长期去除砷的吸附剂。
更新日期:2021-04-08
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