A highly effective adsorbent of lanthanum-modified D751 resin (D751 resin for macroporous styrene chelated resin, sodium form) was prepared to enhance the effect of removing phosphate from solution. FTIR, SEM were used to explore the functional groups and structural features on the surface of D751-La; XPS analyzed the action mechanism between phosphate and D751-La. The adsorption performance about D751-La toward phosphate was investigated by batch experiment. The results showed that Langmuir, Freundlich, Temkin, Koble-Corrigan as well as Redlich-Peterson models fitted well for the adsorption isotherms. The adsorption kinetics could be better fitted by Double Constant, Elovich, and Pseudo-second-order model. The effect of salinity was not significant, such as Cl − and SO 4 2− . When the solid-liquid ratio was 15 g·L −1 with setting the reaction time as 8 h, the unit adsorption quantity of D751-La to phosphate (calculated in P) reached up to 26.3mg·g −1 under the solution pH=3 at 293 K. The process was spontaneous and exothermic from thermodynamic analysis. It shows that D751-La has potential to remove phosphate from solution.

中文翻译：

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镧改性大孔螯合树脂从水溶液中吸附磷酸盐

制备了一种高效的镧改性D751树脂吸附剂（D751树脂用于大孔苯乙烯螯合树脂，钠型），以增强从溶液中去除磷酸盐的效果。FTIR、SEM用于探究D751-La表面的官能团和结构特征；XPS分析了磷酸盐与D751-La的作用机制。通过批量实验研究了D751-La对磷酸盐的吸附性能。结果表明，Langmuir、Freundlich、Temkin、Koble-Corrigan 以及 Redlich-Peterson 模型非常适合吸附等温线。Double Constant、Elovich 和 Pseudo-second-order 模型可以更好地拟合吸附动力学。盐度的影响不显着，如Cl - 和SO 4 2- 。当固液比为15 g·L -1 且反应时间为8 h时，D751-La在溶液pH下对磷酸盐（以P计算）的单位吸附量达到26.3mg·g -1 =3 在 293 K。根据热力学分析，该过程是自发的和放热的。这表明 D751-La 具有从溶液中去除磷酸盐的潜力。