Jin Qian, Li Yadong, Yang Desong, Cui Jianghu
College of Agriculture, Shihezi University Shihezi 832000 Xinjiang P. R. China
Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology Guangzhou 510650 China
RSC Adv. 2018 Jan 3;8(3):1255-1264. doi: 10.1039/c7ra11770a. eCollection 2018 Jan 2.
Despite much progress in modifying chitosan as an absorbent for wastewater treatment, it is still difficult for current chitosan-based adsorbents to achieve the desired removal effects towards basic dyes. In this study, chitosan-derived three-dimensional porous carbon (CTC) consisting of large-diameter channels and mesopores was prepared to remove methylene blue (MB) from wastewater. The results indicate that CTC has excellent performance for MB removal, and the maximum adsorption capacity was 925.93 mg g at 318 K. The adsorption isotherm and kinetics models of MB on CTC could be described well by the Langmuir isotherms and the pseudo-second-order rate model. An experiment to study the CTC removal of MB from a flowing aqueous solution was performed using a homemade device. The water treatment rate of CTC reached 250 L g h, with high MB removal efficiency (>93.4%). Furthermore, the desorption-adsorption experiments indicate that CTC is also a reusable adsorbent that can be applied to recover MB from wastewater. The obtained CTC is a promising alternative for the current expensive absorbents and provides a concept for designing the three-dimensional (3D) structures of raw materials to improve adsorption capability.
尽管在将壳聚糖改性为废水处理吸附剂方面取得了很大进展，但目前基于壳聚糖的吸附剂仍难以对碱性染料实现理想的去除效果。在本研究中，制备了由大直径通道和中孔组成的壳聚糖衍生三维多孔碳（CTC），用于去除废水中的亚甲基蓝（MB）。结果表明，CTC对MB具有优异的去除性能，在318 K时最大吸附容量为925.93 mg/g。MB在CTC上的吸附等温线和动力学模型可以用Langmuir等温线和准二级速率模型很好地描述。使用自制装置进行了研究CTC从流动水溶液中去除MB的实验。CTC的水处理速率达到250 L/(g·h)，对MB的去除效率很高（>93.4%）。此外，解吸-吸附实验表明，CTC也是一种可重复使用的吸附剂，可用于从废水中回收MB。所获得的CTC是当前昂贵吸附剂的一种有前景的替代品，并为设计原料的三维（3D）结构以提高吸附能力提供了一种思路。
