Rapti Sofia, Pournara Anastasia, Sarma Debajit, Papadas Ioannis T, Armatas Gerasimos S, Tsipis Athanassios C, Lazarides Theodore, Kanatzidis Mercouri G, Manos Manolis J
Department of Chemistry , University of Ioannina , 45110 Ioannina , Greece . Email:
Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA.
Chem Sci. 2016 Mar 1;7(3):2427-2436. doi: 10.1039/c5sc03732h. Epub 2015 Nov 18.
We report an anion exchange composite material based on a protonated amine-functionalized metal-organic framework, denoted Metal Organic Resin-1 (), and alginic acid (). material shows an exceptional capability to rapidly and selectively sorb Cr(vi) under a variety of conditions and in the presence of several competitive ions. The selectivity of for Cr(vi) is shown to be the result of strong OCr···NH interactions. The composite sorbent can be successfully utilized in an ion-exchange column, in contrast to pristine which forms fine suspensions in water passing through the column. Remarkably, an ion exchange column with only 1% wt and 99% wt sand (an inert and inexpensive material) is capable of reducing moderate and trace Cr(vi) concentrations to well below the acceptable safety limits for water. The relatively low cost of /sand column and its high regeneration capability and reusability make it particularly attractive for application in the remediation of Cr(vi)-bearing industrial waste.
我们报道了一种基于质子化胺功能化金属有机框架（称为金属有机树脂-1，即 ）和海藻酸（ ）的阴离子交换复合材料。该材料在多种条件下以及存在几种竞争性离子的情况下，表现出快速且选择性地吸附 Cr(VI) 的卓越能力。对 Cr(VI) 的选择性被证明是强 OCr···NH 相互作用的结果。与原始的 不同，原始的 在通过柱子的水中形成细小悬浮液，而这种复合吸附剂可以成功地用于离子交换柱中。值得注意的是，一个仅含有 1% 重量的 和 99% 重量沙子（一种惰性且廉价的材料）的离子交换柱，能够将中等和痕量的 Cr(VI) 浓度降低到远低于水的可接受安全限值。 /沙子柱相对较低的成本及其高再生能力和可重复使用性使其在含 Cr(VI) 工业废物的修复应用中特别具有吸引力。
