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改性凹凸棒石对水中磷的吸附研究进展
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Abstract:
富营养化是一个全球性问题，威胁着饮用水安全乃至整个生态系统平衡。水体中磷(以磷酸盐为主)的过量排放是引起富营养化的重要原因之一，控制水体中磷的浓度，特别是磷酸盐浓度，具有重要的意义。近年来，吸附剂用于水体除磷的应用越来越广泛，凹凸棒石因其成本低、吸附性好等优势而被广泛研究。尽管近几年报道的凹凸棒石改性吸附剂除磷效率普遍较高，但其除磷机理仍未完全理清。本文总结了改性凹凸棒石的技术方法，系统分析了其吸附机理，并对今后的研究方向进行了展望，为完善改性凹凸棒石吸附机理及工艺改进提供参考。
Eutrophication is a global problem that threatens the safety of drinking water and even the balance of the entire ecosystem. Excessive discharge of phosphorus (mainly phosphate) in water bodies is one of the important causes of eutrophication. It is important to control the concentration of phosphorus, especially phosphate, in water bodies. In recent years, adsorbents for phosphorus removal from water have become more and more widely used. Attapulgite has been widely studied because of its low cost and good adsorption properties. Notably, the phosphorus removal efficiencies of attapulgite-modified adsorbents reported in recent years are generally high, but their phosphorus removal mechanisms are still not clarified. The technical approach of modified attapulgite is summarized in the paper. Then its adsorption mechanism was systematically analyzed. Finally, the future research direction is envisioned, with a view to providing reference for the improvement of the adsorption mechanism of modified attapulgite and the process improvement.
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