Eco-Friendly Alkali-Free Arginine-Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Paulmanickam Koilraj, Keiko Sasaki

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A new one-pot synthesis of highly crystalline MgAl-, CoAl- and ZnAl-layered double hydroxides (LDHs) containing NO3 as interlayer anion along with the surface functionalization of L-arginine was demonstrated by the ecofriendly alkali-free arginine-assisted hydrothermal method to examine the adsorptive reduction of chromate (CrO4 2−) from aqueous solutions. The amino acid mediated water hydrolysis resulted abundant OH in the medium, which served as precipitant, and the NO3 from metal precursor acts as an interlayer anion along with surface functionalization of amino acid. Adsorption studies revealed that the removal of CrO4 2− by anion exchange was the greatest in MgAl-LDH with 1.619 mmol-Cr/g of LDH. The mechanism of CrO4 2− removal was due to the ion-exchange of NO3 from the interlayer as well as the counter anions present on the functionalized arginine cation. The adsorbed CrO4 2− was partially reduced to nontoxic Cr3+ on the surface of LDH due to the presence of amino acid functionalization. The present technique provides several advantages from the aspect of sustainable chemistry: (i) avoiding hazardous alkali for the preparation of LDH, (ii) removal of CrO4 2− by ion-exchange and (iii) partial detoxification of CrO4 2− by reduction to Cr3+ on the surface of the LDH.

Original languageEnglish
Pages (from-to)10459-10469
Number of pages11
JournalChemistrySelect
Volume2
Issue number32
DOIs
Publication statusPublished - Nov 13 2017

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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