Ordered mesoporous MnO2 as a synergetic adsorbent for effective arsenic(III) removal
Ordered mesoporous MnO2 as a synergetic adsorbent for effective arsenic(III) removal
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DOI：
10.1039/c3ta13790b
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发表时间：
2014-01
影响因子：
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通讯作者：
Bo Zhi;H. Ding;Dongmei Wang;Yu Cao;Ye Zhang;Xue Wang;Yunlin Liu;Q. Huo
中科院分区：
文献类型：
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作者：
Bo Zhi;H. Ding;Dongmei Wang;Yu Cao;Ye Zhang;Xue Wang;Yunlin Liu;Q. Huo
以介孔分子筛SBA-15为模板，采用真空辅助纳米浇铸法成功制备了有序介孔MnO 2纳米阵列。为了获得更好的As（III）净化性能，将不同比例的铁氧化物分散到二维六边形孔道中，得到一系列FeMn-x吸附剂。这些吸附剂均由铁锰氧化物组成，能同时实现对As（III）的强氧化和有效吸附，表现出协同除砷的作用。饱和吸附容量为10.55 mg g-1，在相对较短的时间内可达到>95%的吸附稳定性。此外，由于最佳的Fe/Mn比，FeMn-2样品可以很容易地将残留浓度降低到10 ppb以下，当处理痕量As（III）浓度低至300 ppb时，这提供了一种方便的方法，以有效地捕获痕量As（III）从水中进行深度净化。
Ordered mesoporous MnO2 nanoarrays were successfully prepared via a vacuum-assisted nanocasting route from an SBA-15 template. To achieve better purification performance for As(III), iron oxides with varied ratios were dispersed into the 2D hexagonal channels, and a series of FeMn-x adsorbents were obtained. Consisting of both iron and manganese oxides, these adsorbents could realize powerful oxidation and effective adsorption of As(III) simultaneously, revealing a synergetic arsenic removal process. The saturation adsorption capacity was 10.55 mg g−1 and >95% adsorption stability could be reached within a relatively short time. Furthermore, owing to the optimum Fe/Mn ratio, the FeMn-2 sample could easily bring the residual concentration down to below 10 ppb, when dealing with trace As(III) concentrations as low as 300 ppb, which provides a convenient method to efficiently capture trace As(III) from water for in-depth purification.