Effect of Zr(IV) to phosphorus ratio on U(VI) adsorption by diethylenetriamine-pentamethylene phosphate Zr(IV) hybrids
Effect of Zr(IV) to phosphorus ratio on U(VI) adsorption by diethylenetriamine-pentamethylene phosphate Zr(IV) hybrids
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DOI：
10.1515/ract-2021-1052
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发表时间：
2021-09
影响因子：
1.8
通讯作者：
Youqun Wang;Huan Wang;Yue Feng;Zhi-Bin Zhang;Xiaokai Cao;Yunhai Liu
中科院分区：
文献类型：
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作者：
Youqun Wang;Huan Wang;Yue Feng;Zhi-Bin Zhang;Xiaokai Cao;Yunhai Liu
本文以二乙烯三胺五亚甲基膦酸（DTPMP）为原料，采用水热法合成了锆（IV）有机磷酸酯杂化物（Zr-DTPMP-x，x为合成过程中Zr（IV）/DTPMP的摩尔比，x = 0.5，1，2，3）。采用SEM&EDS、FT-IR、XRD、Zeta电位、XPS、TGA和接触角分析等手段对Zr-DTPMP-x的物化性能进行了表征。研究了Zr-DTPMP-x对U（VI）的吸附性能。结果表明，Zr（IV）与磷化氢的最佳摩尔比为0.5，最佳pH为4.0，最佳平衡时间为180 min，最佳投加量为10 mg.吸附U（VI）符合准二级动力学模型和Sips等温模型。此外，由Sips等温模型确定的Zr-DTPMP-0.5的吸附容量为181.34 mg g−1。Zr-DTPMP-0.5对U（VI）的吸附选择性比其他几种树脂都要上级。Zr-DTPMP-0.5可能是一个强有力的候选人，减少U（VI）的污染。
Abstract In this work, diethylenetriamine pentamethylenephosphonic acid (DTPMP) was ultilized into preparing of Zr(IV) organophosphates hybrids (Zr-DTPMP-x, x was the molar ratio of Zr(IV)/DTPMP in the synthetic process, x = 0.5, 1, 2, and 3) using a hydrothermal method. The physical and chemical properties of Zr-DTPMP-x were characterized by SEM&EDS, FT-IR, XRD, Zeta potential, XPS, TGA and contact angle analysis. Moreover, the adsorptive performances of Zr-DTPMP-x for U(VI) were investigated. The adsorption results showed that the optimum molar ratio of Zr(IV) to phosphine, pH, equilibrium time, and dosage was 0.5, 4.0, 180 min, and 10 mg, respectively. Besides, the adsorption of U(VI) was in accordance with the pseudo-second-order kinetic model and Sips isothermal model. Moreover, the adsorption capacity determined by Sips isothermal model was 181.34 mg g−1 for Zr-DTPMP-0.5. Furthermore, the adsorptive selectivity of Zr-DTPMP-0.5 for U(VI) was superior than the others. Zr-DTPMP-0.5 may be a powerful candidate for diminishing the contamination of U(VI).