Improved utilization of active sites for phosphorus adsorption in FeOOH/anion exchanger nanocomposites via a glycol-solvothermal synthesis strategy  

作　　者：Yi Zhang Qiong Tang Yifan Sun Chenxu Yao Zhen Yang Weiben Yang 

机构地区：[1]School of Chemistry and Materials Science,Jiangsu Provincial Key Laboratory of Material Cycling and Pollution Control,Nanjing Normal University,Nanjing 210046,China

出　　处：《Journal of Environmental Sciences》2022年第1期313-323,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52070100,51978341,52081330506,and 52011530433);the Natural Science Foundation of Jiangsu Province of China(No.BK20190087);the Foundation of Jiangsu Collaborative Innovation Center of Biomedical Functional Materials;a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions。

摘　　要：Metal oxide/hydroxide-based nanocomposite adsorbents with porous supporting matrices have been recognized as efficient adsorbents for phosphorus recovery.Aiming at satisfying increasingly restrictive environmental requirements involving improving metal site utilization and lowering metal leakage risk,a glycol-solvothermal confined-space synthesis strategy was proposed for the fabrication of Fe OOH/anion exchanger nanocomposites(Fe/900s)with enhanced metal site utilization and reduced metal leakage risk.Compared to composites prepared using alkaline precipitation methods,Fe/900s performed comparably,with a high adsorption capacity of 19.05 mg-P/g with an initial concentration of 10 mg-P/L,a high adsorption selectivity of 8.2 mg-P/g in the presence of 500 mg-SO_(4)^(2-)/L,and high long-term resilience(with a capacity loss of~14%after five cycles),along with substantially lower Fe loading amount(4.11 wt.%)and Fe leakage percentage.Mechanistic investigation demonstrated that contribution of the specific Fe OOH sites to phosphate adsorption increased substantially(up to 50.97%under the optimal conditions),in which Fe(Ⅲ)-OH was the dominant efficient species.The side effects of an excessively long reaction time,which included quaternary ammonium decomposition,Fe OOH aggregation,and Fe(Ⅲ)reduction,were discussed as guidance for optimizing the synthesis strategy.The glycol-solvothermal strategy provides a facile solution to environmental problems through nanocrystal growth engineering in a confined space.

关 键 词：Phosphate adsorption Nanocomposite adsorbent Metal site utilization Metal hydroxides/oxides Ethylene glycol-solvothermal confined-space synthesis 

分 类 号：X505[环境科学与工程—环境工程] TQ424[化学工程]