Sun Yaohui, Li Yanhui, Chen Bing, Wang Mingzhen, Zhang Yang, Chen Kewei, Du Qiuju, Wang Yuqi, Pi Xinxin
College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao266071, China.
State Key Laboratory of Bio-fibers and Eco-textiles, College of Mechanical and Electrical Engineering, Qingdao University, Qingdao266071, China.
ACS Omega. 2022 Nov 3;7(45):41246-41255. doi: 10.1021/acsomega.2c04904. eCollection 2022 Nov 15.
It can be difficult to remove dark methylene blue (MB) from water effectively. The use of sodium alginate and bentonite (Ben) as the matrix produced a displacement reaction that occurred in cobalt chloride, which allowed Ben to be successfully encapsulated in cobalt alginate (CA). Finally, a vacuum freeze-drying method was used to prepare a low-cost composite of CA/Ben aerogel for adsorbing MB in aqueous solutions. In addition to scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy, the composites were also characterized and analyzed. Different adsorption experiments were conducted in order to determine the effects of dosage, pH, adsorption time, and temperature on the adsorption performance of the adsorbent. According to the results of the experiment, the adsorption capacity of CA/Ben aerogel was 258.92 mg·g, and the pseudo-first-order kinetic model and Freundlich isotherm model can fully explain the adsorption process of MB on this aerogel. The composite material reported in this paper is easily recycled, and the removal rate reaches 65% after four times of recycling. Moreover, compared with other adsorbents, the composite material of the invention is highly environmentally friendly and has a simple preparation process. A large-scale application of this technology is the removal of dyes from water on a large scale.
从水中有效去除深色亚甲基蓝（MB）可能具有挑战性。使用海藻酸钠和膨润土（Ben）作为基质会发生在氯化钴中的置换反应，这使得Ben能够成功地被包裹在海藻酸钴（CA）中。最后，采用真空冷冻干燥法制备了用于吸附水溶液中MB的低成本CA/Ben气凝胶复合材料。除了扫描电子显微镜、热重分析和傅里叶变换红外光谱外，还对复合材料进行了表征和分析。进行了不同的吸附实验，以确定剂量、pH值、吸附时间和温度对吸附剂吸附性能的影响。根据实验结果，CA/Ben气凝胶的吸附容量为258.92 mg·g，准一级动力学模型和Freundlich等温线模型能够充分解释MB在该气凝胶上的吸附过程。本文报道的复合材料易于回收利用，经过四次循环后去除率达到65%。此外，与其他吸附剂相比，本发明的复合材料具有高度的环境友好性且制备工艺简单。该技术的大规模应用是大规模去除水中的染料。
