Su Qiaoqiao, Wei Xiang, Yang Guangyao, Ou Zhaohui, Zhou Zhicheng, Huang Ronghua, Shi Caijun
Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education, School of Civil Engineering and Architecture, Guangxi University, Nanning, PR China; Guangxi Key Laboratory for Polysaccharide Materials and their Modification of Guangxi Minzu Univerisity, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, College of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning, Guangxi, PR China.
Guangxi Key Laboratory for Polysaccharide Materials and their Modification of Guangxi Minzu Univerisity, Key Laboratory of New Technology for Chemical and Biological Transformation Process of Guangxi Higher Education Institutes, College of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning, Guangxi, PR China.
J Hazard Mater. 2023 Jul 5;453:131363. doi: 10.1016/j.jhazmat.2023.131363. Epub 2023 Apr 6.
In the present work, a novel, floral-like, magnetic sodalite microsphere (SODM) was synthesized in situ by using fly ash (FA) and metakaolin (MK) as raw materials and was used to remove Cd(II) from water. Its magnetism can solve the problems of adsorbent recovery and possible secondary pollution. During the static adsorption, SODM shows a maximum adsorption capacity of 245.17 mg/g. The adsorption of Cd(II) on the SODM surface is spontaneous, exothermic, and physicochemical adsorption, which was evaluated by thermodynamics, kinetics, and isotherm studies. During dynamic adsorption, SODM shows a maximum adsorption capacity of 342.74 mg/g in the simulated solution prepared by the deionized water, compared to 215.88 mg/g in the simulated solution prepared using Xiangsi Lake water from Guangxi Minzu University. At 0.5 g SODM dosage in the dynamic adsorption, the adsorption capacity could rise to 632.81 mg/g. These results demonstrated the excellent Cd (II) adsorption performance of the SODM. The adsorption of cadmium on the SODM surface includes the synergistic effects of electrostatic attraction, ion exchange, and surface coordination reaction. Besides, the SODM shows good regeneration performance in both the deionized water and Xiangsi Lake water. The present study explores SODM as an adsorbent for the Cd (II) removal from wastewater and unbolts the industrial applicability of the SODM in the field of wastewater purification.
在本工作中，以粉煤灰（FA）和偏高岭土（MK）为原料原位合成了一种新型的花状磁性方钠石微球（SODM），并用于去除水中的Cd（II）。其磁性可解决吸附剂回收和可能的二次污染问题。在静态吸附过程中，SODM的最大吸附容量为245.17mg/g。通过热力学、动力学和等温线研究评估了Cd（II）在SODM表面的吸附是自发的、放热的物理化学吸附。在动态吸附过程中，SODM在由去离子水配制的模拟溶液中的最大吸附容量为342.74mg/g，相比之下，在使用广西民族大学相思湖湖水配制的模拟溶液中的最大吸附容量为215.88mg/g。在动态吸附中，当SODM用量为0.5g时，吸附容量可提高到632.81mg/g。这些结果证明了SODM对Cd（II）具有优异的吸附性能。镉在SODM表面的吸附包括静电吸引、离子交换和表面配位反应的协同作用。此外，SODM在去离子水和相思湖水中均表现出良好的再生性能。本研究探索了SODM作为去除废水中Cd（II）的吸附剂，并揭示了SODM在废水净化领域的工业应用潜力。
