Degradation of bisphenol A by nano-sized manganese dioxide synthesized using montmorillonite as templates

Degradation of bisphenol A by nano-sized manganese dioxide synthesized using montmorillonite as templates
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蒙脱石为模板合成纳米二氧化锰降解双酚A

DOI:
10.1016/j.clay.2016.05.028
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发表时间:
2016-11
影响因子:
5.6
通讯作者:
Gu Cheng
Gu Cheng
中科院分区:
地球科学2区
文献类型:
--
作者:
Fang Lin;Hong Ran;Gao Juan;Gu Cheng

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研究了以天然蒙脱土为模板合成纳米二氧化锰的新方法。当可交换的Mn2 +阳离子与KMnO4反应时,蒙脱土独特的结构有效地阻止了mno2的团聚,从而形成纳米级mno2颗粒。通过对双酚A (BPA)的氧化反应可知,黏土矿物模板二氧化锰比常规方法制备的纳米二氧化锰具有更高的反应活性。在pH 4.0条件下,含250 mg L - 1蒙脱土(109 μM MnO2)和21.9 μM BPA, 10 min内可降解90%以上的BPA。在酸性条件下,腐植酸的存在对BPA的去除有显著的促进作用,而在碱性条件下则有轻微的抑制作用。由于蒙脱土在自然环境中的普遍分布,蒙脱土模板二氧化锰将为许多有机污染物的原位修复提供潜力。
A new method was developed to synthesize nanoscale manganese dioxide (MnO2) using natural montmorillonite as the template. When the exchangeable Mn2 +cations reacted with KMnO4, the unique structure of montmorillonite effectively prevented the agglomeration of MnO2resulting in the formation of nano-sized MnO2particles. The clay mineral-templated MnO2showed higher reactivity compared to nano-MnO2prepared by conventional method as indicated by the oxidation of bisphenol A (BPA). Over 90% of BPA could be degraded within 10 min at pH 4.0 containing 250 mg L− 1montmorillonite (109 μM MnO2) and 21.9 μM BPA. The presence of humic acid showed significant enhancement on BPA removal under acidic condition, while slight inhibition under alkaline condition. Due to the ubiquitous distribution of montmorillonite in natural environment, montmorillonite templated MnO2would offer the potential for in situ remediation of many organic contaminants.
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