Highly selective capture of phosphate ions from water by a water stable metal-organic framework modified with polyethyleneimine
Highly selective capture of phosphate ions from water by a water stable metal-organic framework modified with polyethyleneimine
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通过聚乙烯亚胺改性的水稳定金属有机骨架从水中高度选择性地捕获磷酸根离子
DOI：
10.1007/s11356-017-9946-9
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发表时间：
2017
影响因子：
5.8
通讯作者：
Song Mingxia
中科院分区：
文献类型：
--
作者：
Qiu Hui;Yang Luyang;Liu Fengling;Zhao Yunxia;Liu LeLe;Zhu Jinhong;Song Mingxia
在这项工作中，一系列的聚乙烯亚胺（PEI）浸渍的金属-有机框架（UiO-66）与不同的PEI负载制备和应用作为吸附剂，从水中捕获磷酸根离子。SEM和XRD分析表明，PEI分散在UiO-66的外表面和内部孔中。当PEI负载量为9.45%（UiO-66-3）时，298 K时的饱和吸附容量为73.15 mg P/g，比以往报道的大多数吸附剂都要上级。UiO-66-3在pH 2.0 ~ 7.0的范围内具有较好的固磷效果。吸附50 min达到平衡。与商业阴离子交换剂伊拉-900不同，即使存在大量共存阴离子，UiO-66-3仍表现出对磷酸盐的高去除率。连续吸附试验表明，UiO-66-3对磷酸盐的去除效率在六个循环运行后保持恒定。上述结果表明UiO-66-3作为一种有前途的去除水中磷酸盐的吸附剂具有很大的潜力。
In this work, a series of polyethyleneimine (PEI) impregnated metal-organic framework (UiO-66) with varying PEI loadings were prepared and applied as sorbents to capture phosphate ions from water. As indicated by SEM and XRD analysis, PEI was dispersed on the outer surface and the inner pores of UiO-66. At 9.45% PEI loadings (UiO-66-3), the saturated adsorption capacity of phosphate reached 73.15 mg P/g at 298 K, which is superior to most sorbents ever reported. UiO-66-3 could sequestrate phosphate over a wide pH range from 2.0 to 7.0 with high efficiency. The sorption toward phosphate reached equilibrium in 50 min. Unlike commercial anion exchanger IRA-900, UiO-66-3 still exhibited high removal toward phosphate even large amount of coexisted anions were present. Successive sorption assay demonstrated that the removal efficiency of UiO-66-3 toward phosphate remained constant after six cyclic runs. All the above results indicated the great potential of UiO-66-3 as a promising sorbent for the decontamination of water from phosphate.