Removal of hexavalent Cr by coconut coir and derived chars - The effect of surface functionality
Removal of hexavalent Cr by coconut coir and derived chars - The effect of surface functionality
复制标题
DOI：
10.1016/j.biortech.2011.10.096
复制
发表时间：
2012-01-01
影响因子：
11.4
通讯作者：
Kuan, Wen-Hui
中科院分区：
文献类型：
--
作者：
Shen, Ying-Shuian;Wang, Shan-Li;Kuan, Wen-Hui
考察了不同热解温度下椰壳和炭对Cr（VI）的脱除效果。随着热解温度的升高，焦炭的表面积增大，相应的含氧官能团含量降低。CC和CC衍生炭对Cr（VI）的脱除主要是由于材料将Cr（VI）还原为Cr(III)，而Cr（VI）的还原程度和速率是由材料中的含氧官能团决定的。对于在较高温度下获得的炭，纯Cr（VI）吸附对总体Cr（VI）去除的贡献变得相对显著。因此，为了开发一种经济有效的去除水中Cr（VI）的方法，原始CC比碳质CC更有优势，因为它不需要热解，并且CC具有更高的官能团含量，可以将Cr（VI）还原为毒性较小的Cr（III）。(C) 2011 Elsevier Ltd.版权所有。
The Cr(VI) removal by coconut coir (CC) and chars obtained at various pyrolysis temperatures were evaluated. Increasing the pyrolysis temperature resulted in an increased surface area of the chars, while the corresponding content of oxygen-containing functional groups of the chars decreased. The Cr(VI) removal by CC and CC-derived chars was primarily attributed to the reduction of Cr(VI) to Cr(III) by the materials and the extent and rate of the Cr(VI) reduction were determined by the oxygen-containing functional groups in the materials. The contribution of pure Cr(VI) adsorption to the overall Cr(VI) removal became relatively significant for the chars obtained at higher temperatures. Accordingly, to develop a cost-effective method for removing Cr(VI) from water, the original CC is more advantageous than the carbonaceous counterparts because no pyrolysis is required for the application and CC has a higher content of functional groups for reducing Cr(VI) to less toxic Cr(III). (C) 2011 Elsevier Ltd. All rights reserved.