Phosphate recovery from aqueous environment with recyclable nanoscale zero-valent iron coated with aluminum hydroxide,Chemical Engineering Science

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Phosphate recovery from aqueous environment with recyclable nanoscale zero-valent iron coated with aluminum hydroxide
Chemical Engineering Science ( IF 4.1 ) Pub Date : 2024-11-07 , DOI: 10.1016/j.ces.2024.120908
Zhixuan Tan, Xiaoyao Fan, Qiqi Fan, Siqi Lu, Tian Yu, Lihang Ma, Yuxuan Luo, Jing Li, Hao Li, Yi-bo Hu

Recovery of phosphate (PO4-P) from the aqueous environment is crucial for sustainable eutrophication and phosphorus resource management. In this study, aluminum hydroxide-coated nanoscale zero-valent iron (NZVI@Al(OH)3) was developed as a magnetic-recyclable, air-stable, and efficient adsorbent for aqueous PO4-P removal and recovery. The Al(OH)3 shell could effectively protect the NZVI core from corrosion by O2 and H+ under aerobic and anaerobic conditions, keeping the NZVI@Al(OH)3 magnetically recyclable after adsorption. In addition, the Al(OH)3 shell adsorbs PO4-P efficiently via Al-O-P inner-sphere complexation, which was not affected by atmospheric conditions, pH conditions, and the co-existing anions and natural organic matter in real surface waters. After adsorption, PO4-P can be readily desorbed by facile immersion of used NZVI@Al(OH)3 in a highly alkaline solution and precipitated as hydroxylapatitle, with bare NZVI and dissolved AlO2- recovered for recycling. Therefore, NZVI@Al(OH)3 is a robust and cost-effective adsorbent for PO4-P recovery under real surface water conditions.

更新日期：2024-11-07

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