Effective Adsorption and Removal of Phosphate from Aqueous Solutions and Eutrophic Water by Fe-based MOFs of MIL-101.
Effective Adsorption and Removal of Phosphate from Aqueous Solutions and Eutrophic Water by Fe-based MOFs of MIL-101.
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MIL-101 铁基 MOF 有效吸附去除水溶液和富营养化水中的磷酸盐
DOI：
10.1038/s41598-017-03526-x
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发表时间：
2017-06-12
影响因子：
4.6
通讯作者：
Guo H
中科院分区：
文献类型：
--
作者：
Xie Q;Li Y;Lv Z;Zhou H;Yang X;Chen J;Guo H
尽管人们已经在吸附去除水溶液和富营养化水体中的磷酸盐方面做了很多努力，但仍然非常需要开发具有高吸附容量的新型吸附剂。在本研究中，铁基金属有机框架（MOFs），MIL-101和NH 2-MIL-101，通过一般的简易策略制备。研究了它们作为除磷吸附剂的性能。研究了吸附剂投加量、吸附时间、共存离子等因素对吸附效果的影响。MIL-101（Fe）和NH 2-MIL-101（Fe）均表现出对水溶液中磷酸盐的高效去除，在暴露30 min内，磷酸盐浓度分别从初始的0.60 mg·L-1急剧下降至0.045和0.032 mg·L-1。吸附动力学和吸附等温线表明，NH 2-MIL-101（Fe）比MIL-101（Fe）具有更高的吸附容量，可能是由于胺基团。此外，铁基MOFs还表现出对磷酸根的高选择性超过其他阴离子如氯离子、溴离子、硝酸根和硫酸根。特别是，制备的铁基MIL-101材料也能够吸附实际富营养化水样中的磷酸盐，表现出较好的去除效果。
Although many efforts have been devoted to the adsorptive removal of phosphate from aqueous solutions and eutrophic water, it is still highly desirable to develop novel adsorbents with high adsorption capacities. In this study, Fe-based metal-organic frameworks (MOFs), MIL-101 and NH2-MIL-101, are fabricated through a general facile strategy. Their performance as an adsorbent for phosphate removal is investigated. Experiments are performed to study the effects of various factors on the phosphate adsorption, including adsorbent dosage, contact time and co-existing ions. Both MIL-101(Fe) and NH2-MIL-101(Fe) show highly effective removal of phosphates from aqueous solutions, and the concentration of phosphates decrease sharply from the initial 0.60 mg·L−1to 0.045 and 0.032 mg·L−1, respectively, within just 30 min of exposure. The adsorption kinetics and adsorption isotherms reveal that NH2-MIL-101(Fe) has higher adsorption capacity than MIL-101(Fe) possibly due to the amine group. Furthermore, the Fe-based MOFs also exhibit a high selectivity towards phosphate over other anions such as chloride, bromide, nitrate and sulfate. Particularly, the prepared Fe-based MIL-101 materials are also capable of adsorbing phosphate in an actual eutrophic water sample and display better removal effect.