Tuning the morphology and adsorption capacity of Al-MIL-101 analogues with Fe3+ for phosphorus removal from water

Shengjian Li; Ting Lei; Fang Jiang; Meng Liu; Yating Wang; Shixiong Wang; Xiangjun Yang

doi:10.1016/j.jcis.2019.10.077

Tuning the morphology and adsorption capacity of Al-MIL-101 analogues with Fe³⁺ for phosphorus removal from water

J Colloid Interface Sci. 2020 Feb 15:560:321-329. doi: 10.1016/j.jcis.2019.10.077. Epub 2019 Oct 21.

Authors

Shengjian Li¹, Ting Lei¹, Fang Jiang¹, Meng Liu¹, Yating Wang¹, Shixiong Wang², Xiangjun Yang³

Affiliations

¹ Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China.
² Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China. Electronic address: wangshixiong@ynu.edu.cn.
³ Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China. Electronic address: yxjun@ynu.edu.cn.

PMID: 31671353
DOI: 10.1016/j.jcis.2019.10.077

Abstract

In this work, water-stable Al-MIL-101 analogues were successfully synthesized by adjusting the Fe/Al ratio to obtain excellent phosphorus removal efficiencies. The introduction of Fe³⁺ into the precursor solution allowed the final structure of aluminum metal-organic frameworks (Al-MOFs) to be tuned without introducing Fe into the final structure. The formation of Al-MIL-101 analogues with different morphologies and surface areas was accomplished by adjusting the Fe/Al molar ratio in the precursor solution. Compared with pure Fe-MIL-101 or Al-MIL-101, Al-MIL-101 analogues exhibited ultra-fast phosphorous adsorption kinetics and high phosphorous adsorption capacities. Al-MIL-101, produced with an Fe/Al feed molar ratio of 0.5, achieved a maximum phosphorus uptake capacity of 90 mg P/g, which is much higher than the phosphorus absorption reported in most literatures. More importantly, the Al-MIL-101 analogue obtained using an Fe/Al molar ratio of 0.5 exhibited an excellent phosphorus removal efficiency, even after multiple adsorption/desorption cycles. These results indicate that Al-MOFs produced by adjusting the Fe amount in the precursor solution are promising candidates for the removal of phosphate from water.

Keywords: Adsorption; Metal-organic frameworks; Morphology-tunable; Phosphorus.