吸附
浸出(土壤学)
复合数
化学工程
尾矿
傅里叶变换红外光谱
扫描电子显微镜
材料科学
朗缪尔吸附模型
Zeta电位
化学
复合材料
冶金
纳米技术
纳米颗粒
有机化学
土壤水分
环境科学
土壤科学
工程类
作者
Huijun Zhao,Haoyu Yao,Feifei Zhao,Liangrong Yang,Lianying Wu,Xiangfeng Liang,Huizhou Liu,Changjiang Yu
标识
DOI:10.1016/j.cej.2023.146068
摘要
Efficient separation of rare earth elements (REEs) from leaching tailings is necessary for environmental protection and full utilization of resources. Cell walls are rich in various active groups that can efficiently adsorb REEs. In this work, a series of composite aerogels based on pectin and cellulose (the key active components in cell walls) were fabricated for effective adsorption of Ce (III) from leaching tailings. Physical and chemical properties of composite aerogels were characterized by Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), contact angle measuring, and a zeta potentiometer. Adsorption capacity was measured under different conditions. Adsorption corresponded to the Langmuir model and the maximum adsorption capacity of Ce (III) was 337.36 mg/g. Kinetic fitting showed that the adsorption process corresponds to the second-order kinetic model. Composite aerogels have excellent regeneration performance. The adsorption process occurred by electrostatic interaction, ion exchange with –COO−, and chelation with C-NH2. Adsorption in a sample of leaching tailings showed that the adsorption efficiency of composite aerogels for Ce (III) and Eu (III) reached 68% and 81%, respectively, demonstrating good practicability.
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