【摘 要】
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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 si
【机 构】
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School of Chemistry and Materials Science,Jiangsu Provincial Key Laboratory of Material Cycling and
论文部分内容阅读
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 utiliza-tion and lowering metal leakage risk,a glycol-solvothermal confined-space synthesis strat-egy was proposed for the fabrication of FeOOH/anion exchanger nanocomposites (Fe/900s)with enhanced metal site utilization and reduced metal leakage risk.Compared to compos-ites 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-SO42-/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 demon-st-rated that contribution of the specific FeOOH sites to phosphate adsorption increased substantially (up to 50.97％ under the optimal conditions),in which Fe(Ⅲ)-OH was the dom-inant efficient species.The side effects of an excessively long reaction time,which included quaternary ammonium decomposition,FeOOH aggregation,and Fe(Ⅲ) reduction,were dis-cussed as guidance for optimizing the synthesis strategy.The glycol-solvothermal strategy provides a facile solution to environmental problems through nanocrystal growth engineer-ing in a confined space.
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