Fabrication and mechanism of La/Al bimetallic organic frameworks for phosphate removal

吸附 双金属片 朗缪尔吸附模型 磷酸盐 密度泛函理论 金属 化学工程 金属有机骨架 无定形固体 材料科学 比表面积 无机化学 化学 物理化学 结晶学 计算化学 有机化学 催化作用 工程类
作者
Zheng Zhu,Linlin Qin,Yulong Liu,Qiqi Zhang,Cheng Peng,Wenyan Liang
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:479: 147081-147081 被引量:13
标识
DOI:10.1016/j.cej.2023.147081
摘要

Lanthanum (La) is constantly used in phosphorus removal due to its high affinity with phosphate. Herein, a novel La/Al bimetallic organic framework was developed to improve the usage efficiency of La species. The effects of metal ratio, pH value and competitive anions were investigated, through which the adsorption mechanism was further explained. Results showed that when the doped La:Al ratio was 1:3, the absorbent (La1Al3-BTC) achieved the most excellent adsorption capacity of 210.3 mg P·g−1 and usage efficiency (P/metal ratio = 1.09). La1Al3-BTC can adapt to the wide pH range and multitudinous coexisting ions in real water, and its adsorption process was in accordance with Langmuir and pseudo-second-order models. Surface morphology of materials transformed from rod-like crystal to amorphous structure as the increase of Al doping. La replaced some Al atoms and embedded in Al-BTC skeleton. The specific surface area raised from 9.27 m2·g−1 of La-BTC to 257.01 m2·g−1 of La1Al3-BTC. The main mechanism for the adsorption of phosphate was the inner-sphere complexation occurred in the La active sites. Electron migration between different metals enhanced the adsorption process. Density-function theory (DFT) calculation well matched the experimental phenomenon. Overall, the development of La1Al3-BTC presented new potential applications for enhanced phosphorus removal and provided new insights for the design of La-based adsorbents.
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