Yang Keyan, Xing Jingchen, Xu Pingping, Chang Jianmin, Zhang Qingfa, Usman Khan Muhammad
College of Material Science and Technology, Beijing Forestry University, 35 Qinghua East Road, Haidian District, Beijing 100083, China.
School of Agricultural and Food Engineering, Shandong University of Technology, 266 Xincun West Road, Zibo 255000, China.
Polymers (Basel). 2020 Jan 19;12(1):236. doi: 10.3390/polym12010236.
In this study, activated carbon microsphere (SLACM) was prepared from powdered sodium lignosulfonate (SL) and polystyrene by the Mannich reaction and ZnCl activation, which can be used to remove Cr(VI) from the aqueous solution without adding any binder. The SLACM was characterized and the batch experiments were conducted under different initial pH values, initial concentrations, contact time durations and temperatures to investigate the adsorption performance of Cr(VI) onto SLACM. The results indicated that the SLACM surface area and average pore size were 769.37 m/g and 2.46 nm (the mesoporous material), respectively. It was found that the reduced initial pH value, the increased temperature and initial Cr(VI) concentration were beneficial to Cr(VI) adsorption. The maximum adsorption capacity of Cr(VI) on SLACM was 227.7 mg/g at an initial pH value of 2 and the temperature of 40 °C. The adsorption of SLACM for Cr(VI) mainly occurred during the initial stages of the adsorption process. The adsorption kinetic and isotherm experimental data were thoroughly described by Elovich and Langmuir models, respectively. SL could be considered as a potential raw material for the production of activated carbon, which had a considerable potential for the Cr(VI) removal from wastewater.
在本研究中，通过曼尼希反应和氯化锌活化，由木质素磺酸钠粉末（SL）和聚苯乙烯制备了活性炭微球（SLACM），其可用于在不添加任何粘结剂的情况下从水溶液中去除Cr（VI）。对SLACM进行了表征，并在不同的初始pH值、初始浓度、接触时间和温度下进行了批量实验，以研究SLACM对Cr（VI）的吸附性能。结果表明，SLACM的表面积和平均孔径分别为769.37 m²/g和2.46 nm（介孔材料）。发现降低初始pH值、提高温度和初始Cr（VI）浓度有利于Cr（VI）的吸附。在初始pH值为2和温度为40℃时，SLACM对Cr（VI）的最大吸附容量为227.7 mg/g。SLACM对Cr（VI）的吸附主要发生在吸附过程的初始阶段。吸附动力学和等温线实验数据分别由Elovich模型和Langmuir模型充分描述。SL可被视为生产活性炭的潜在原料，其在从废水中去除Cr（VI）方面具有相当大的潜力。
