Selective capture of hexavalent chromium from an anion-exchange column of metal organic resin-alginic acid composite

Sofia Rapti, Anastasia Pournara, Debajit Sarma, Ioannis T. Papadas, Gerasimos S. Armatas, Athanassios C. Tsipis, Theodore Lazarides, Mercouri G. Kanatzidis, Manolis J. Manos

Research output: Contribution to journalArticlepeer-review

95 Citations (Scopus)

Abstract

We report an anion exchange composite material based on a protonated amine-functionalized metal-organic framework, denoted Metal Organic Resin-1 (MOR-1), and alginic acid (HA). MOR-1-HA 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 MOR-1-HA for Cr(vi) is shown to be the result of strong O3CrVI⋯NH2 interactions. The composite sorbent can be successfully utilized in an ion-exchange column, in contrast to pristine MOR-1 which forms fine suspensions in water passing through the column. Remarkably, an ion exchange column with only 1% wt MOR-1-HA 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 MOR-1-HA/sand column and its high regeneration capability and reusability make it particularly attractive for application in the remediation of Cr(vi)-bearing industrial waste.

Original languageEnglish
Pages (from-to)2427-2436
Number of pages10
JournalChemical Science
Volume7
Issue number3
DOIs
Publication statusPublished - Mar 1 2016

ASJC Scopus subject areas

  • Chemistry(all)

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