Hierarchical porous cellulose/activated carbon composite monolith for efficient adsorption of dyes
Hierarchical porous cellulose/activated carbon composite monolith for efficient adsorption of dyes
复制标题
用于有效吸附染料的分层多孔纤维素/活性炭复合整体料
DOI：
10.1007/s10570-017-1410-y
复制
发表时间：
2017-10-01
期刊：
影响因子：
5.7
通讯作者：
Uyama, Hiroshi
中科院分区：
文献类型：
--
作者：
Bai, Qiuhong;Xiong, Qiancheng;Uyama, Hiroshi
由于环境原因，廉价而高效的吸附剂用于去除废水中有毒染料分子的污染物的需求很大。这项研究提供了一种新颖的整体式吸附剂的设计，该整体式吸附剂通过简单的合成步骤从大量的材料中分离出来，可以大大减少从处理后的废物中分离吸附剂的繁琐问题。以DMF和正己醇为溶剂，在AC存在下，用热诱导相分离法制备了层状多孔纤维素/活性碳(纤维素/AC)复合整体柱。复合整体柱具有较大的比表面积和中孔分布。它不仅对亚甲基蓝(MB)或罗丹明B(RhB)有较高的吸附能力，而且还能同时吸附MB和RhB，其中一种染料的吸附不受另一种染料的影响。结果表明，溶液pH、染料初始浓度(C0)、接触时间、吸附剂用量和温度对MB和RhB在复合整体柱上的吸附有显著影响。MB和RhB在复合整体柱上的吸附数据符合Freundlich模型，表明复合整体柱具有非均质表面。该整体柱重复使用8次后，仍能保持90%左右的吸附容量。这些数据表明，纤维素/AC复合整体柱具有很大的潜力，是一种成本低、分离方便的废水中染料的吸附剂。
Cheap and efficient adsorbents to remove contaminants of toxic dye molecules from wastewater are strongly in demand for environmental reasons. This study provides a novel design of a monolithic adsorbent from abundant materials via a facile synthetic procedure, which can greatly reduce the problems of the tedious separation of adsorbents from treated wastes. A hierarchically porous cellulose/activated carbon (cellulose/AC) composite monolith was prepared by thermally-induced phase separation of cellulose acetate in the presence of AC, using a mixture of DMF and 1-hexanol, followed by alkaline hydrolysis. The composite monolith had alarge specific surface area with mesopore distribution. It not only showed high uptake capacity towards methylene blue (MB) or rhodamine B (RhB) but could also simultaneously adsorb MB and RhB from their mixture, in which the adsorption of one dye was not influenced by the other one. Remarkable effects of solution pH, initial concentration of dye (C0), contact time, adsorbent dosage and temperature on the adsorption of MB and RhB onto the composite monolith were demonstrated. The binding data for MB and RhB adsorption on the composite monolith fitted the Freundlich model well, suggesting a heterogeneous surface of the composite monolith. The monolith could retain around 90% of its adsorption capacity after 8 times reuse. These data demonstrate that the cellulose/AC composite monolith has a large potential as a promising adsorbent of low cost and convenient separation for dye in wastewater.