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Adsorption of phosphate from aqueous solution onto modified palygorskites

机译：磷酸盐从水溶液中吸附到改性紫杉属植物上

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In this study,the natural and modified palygorskites were tested to remove phosphate ions from aqueous solution.The modified palygorskites were prepared by being activated with hydrochloric acid and/or thermal treatments.The surface structure of the materials was investigated by means of X-ray diffraction (XRD),a N_2 adsorption-desorption technique and Fourier transform-infrared (FT-IR) to understand the effect of surface properties on the adsorption behavior of phosphate.In the adsorption test,the adsorption isotherms,kinetics.pH effect,desorbability and selectivity w ere examined.The results showed that the modified palygorskites had faster kinetics and higher adsorption capacities than the natural palygorskite,which can be attributed to the surface structural changes of the materials,and the adsorbed amounts of phosphate tend to decrease with the increase of pH for all samples.The desorbability of P is about 10-13%,and it is relatively difficult for the adsorbed (PO_4)~(3-) to be desorbed.Palygorskite could selectively adsorbed phosphate in complex solutions,and the selectivity of phosphate adsorption onto palygorskites was 1000-3000 times that of chloride.The relatively low cost and high capabilities of the natural and modified palygorskites make them potentially attractive adsorbents for the removal of phosphate from aqueous solution.
机译：在这项研究中，测试了天然的和改性的小精灵从水中去除磷酸根离子。改性的小精灵通过用盐酸活化和/或热处理制备。材料的表面结构通过X射线研究衍射（XRD），N_2吸附-解吸技术和傅立叶红外光谱（FT-IR）了解表面性质对磷酸盐吸附行为的影响。在吸附试验中，吸附等温线，动力学，pH值，解吸性结果表明，改性的坡缕石比天然坡缕石具有更快的动力学和更高的吸附能力，这归因于材料的表面结构变化，并且随着吸附量的增加，磷酸盐的吸附量趋于减少。 P的解吸性约为10-13％，而被吸附的（PO_4）〜（3-）相对较难解吸凹凸棒石可以选择性地吸附复杂溶液中的磷酸盐，而磷在鳞茎上的选择性是氯的1000-3000倍。天然和改性鳞茎的相对较低的成本和较高的性能使其成为潜在的吸引人的吸附剂。水溶液中的磷酸盐。

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