Jing Wenxiang, Yang Chai, Lin Xiaoyan, Tang Min, Lian Dongming, Yu Ying, Liu Dongyang
School of Materials and Chemistry, Southwest University of Science and Technology 621010 Mianyang Sichuan China
Yibin Forestry and Bamboo Industry Research Institute Yibin 644005 China.
RSC Adv. 2024 Dec 20;14(54):39995-40005. doi: 10.1039/d4ra06363e. eCollection 2024 Dec 17.
Heavy metal wastewater is a direct threat to the ecological environment and human health because it is highly toxic at low concentrations. Therefore, it is very important to explore and develop efficient wastewater treatment agents. MnFeO-loaded bamboo pulp carbon-based aerogel (MCA) is prepared by directional freeze-drying and carbonization. SEM, TEM, XPS, XRD, BET and FTIR are used to evaluate the physical and chemical properties of MCA. Meanwhile, the adsorption performances of MCA on Pb, Cu and Cd are also studied by adsorption kinetics, isothermal curves and thermodynamics. The results show that the adsorption process involves chemical adsorption and physical adsorption, and the adsorption process is a spontaneous endothermic process. The maximum adsorption capacities of MCA for Pb, Cu and Cd obtained in the adsorption isotherm experiments were 74.38, 84.21 and 73.63 mg g, respectively, showing excellent adsorption performance for Pb, Cu and Cd. Therefore, the MCA has potential application for wastewater purification of heavy metals containing Pb, Cu and Cd, meanwhile, this study provides some guidance for the design and application of microspheres for the separation and removal of Pb, Cu and Cd.
重金属废水对生态环境和人类健康构成直接威胁，因为它在低浓度下就具有高毒性。因此，探索和开发高效的废水处理剂非常重要。通过定向冷冻干燥和碳化制备了负载锰铁氧体的竹浆基气凝胶（MCA）。利用扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、X射线衍射（XRD）、比表面积分析仪（BET）和傅里叶变换红外光谱（FTIR）对MCA的物理和化学性质进行了评估。同时，还通过吸附动力学、等温线和热力学研究了MCA对铅、铜和镉的吸附性能。结果表明，吸附过程涉及化学吸附和物理吸附，且吸附过程是一个自发的吸热过程。在吸附等温线实验中，MCA对铅、铜和镉的最大吸附容量分别为74.38、84.21和73.63 mg/g，对铅、铜和镉表现出优异的吸附性能。因此，MCA在含铅、铜和镉的重金属废水净化方面具有潜在应用，同时，本研究为用于分离和去除铅、铜和镉的微球的设计和应用提供了一些指导。
