Issue 5, 2018

Hydrothermal synthesis of hydrocalumite assisted biopolymeric hybrid composites for efficient Cr(vi) removal from water

Abstract

This study focused on the hydrothermal synthesis of hydrocalumite (HC) incorporated biopolymer (alginate and chitosan) based hybrid composite materials for the selective removal of chromium. The synthesized hydrocalumite/alginate (HCAlg) and hydrocalumite/chitosan (HCCS) composites were characterized by FTIR, XRD, SEM, EDAX with mapping images and BET analysis. The synthesized HCCS composite possesses enhanced chromium sorption capacity (SC) compared to HCAlg composite, but both the hybrid composites showed a quick chromium sorption rate at 40 min. The depending adsorption parameters, namely equilibrium time, solution pH, competing co-ions, dosage, initial chromium concentration and temperature, were optimized for the maximum Cr(VI) sorption. The obtained equilibrium data was explained using Freundlich, Langmuir and Dubinin–Radushkevich (D–R) isotherms. The thermodynamic result shows that the nature of the Cr(VI) adsorption attributed to the biopolymeric composites is spontaneous and endothermic. The possible Cr(VI) uptake mechanism of the synthesized biocomposites was occurred by electrostatic attraction and ion-exchange. The reusability of the synthesized adsorbents was carried out using NaOH and they can be used upto five cycles. Both the prepared biocomposites showed promising results against chromium contaminated ground water by reducing the chromium concentration below the tolerance limit.

Graphical abstract: Hydrothermal synthesis of hydrocalumite assisted biopolymeric hybrid composites for efficient Cr(vi) removal from water

Article information

Article type
Paper
Submitted
20 Nov 2017
Accepted
07 Jan 2018
First published
02 Feb 2018

New J. Chem., 2018,42, 3371-3382

Hydrothermal synthesis of hydrocalumite assisted biopolymeric hybrid composites for efficient Cr(VI) removal from water

S. Periyasamy and N. Viswanathan, New J. Chem., 2018, 42, 3371 DOI: 10.1039/C7NJ04524G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements