Application of Chitosan-Clay Biocomposite Beads for Removal of Heavy Metal and Dye from Industrial Effluent

Shanta Biswas,Papia Haque,Mohammed Mizanur Rahman,Tonmoy Debnath,Taslim Ur Rashid

doi:10.3390/jcs4010016

Abstract

In recent years, there has been increasing interest in developing green biocomposite for industrial wastewater treatment. In this study, prawn-shell-derived chitosan (CHT) and kaolinite rich modified clay (MC) were used to fabricate biocomposite beads with different compositions. Prepared composite beads were characterized by FTIR, and XRD, and SEM. The possible application of the beads was evaluated primarily by measuring the adsorption efficiency in standard models of lead (II) and methylene blue (MB) dye solution, and the results show a promising removal efficiency. In addition, the composites were used to remove Cr (VI), Pb (II), and MB from real industrial effluents. From tannery effluent, 50.90% of chromium and 39.50% of lead ions were removed by composites rich in chitosan and 31.50% of MB was removed from textile effluent by a composite rich in clay. Moreover, the composite beads were found to be activated in both acidic and basic media depending on their composition, which gives a scope to their universal application in dye and heavy metal removal from wastewater from various industries.

Highlights

In modern times wastewater released from industries is a major concern for environmentalists
While studying the FTIR spectra of the composites, the characteristic peaks of chitosan (at 1601 cm−1 (N–H bending) and 3402 cm−1 (O–H stretching overlapping the N–H stretching of primary amine) and modified clay were observed, which confirmed the existence of these two components in the composites (Figure 2)
It can be concluded that the biocomposite beads of chitosan with modified Bijoypur clay act as a promising adsorbent to remove Cr (VI) and Pb (II) ions and methylene blue dye from both standard solution and real effluent

Summary

Introduction

In modern times wastewater released from industries is a major concern for environmentalists. Industrial effluents contain various toxic metals, harmful gases, and many organic and inorganic compounds. The discharge of these untreated toxic effluents has deteriorated natural flora and fauna and causes a risk to human health. A fair number of physical, chemical, and biological methods have been employed to embark upon the problem of the removal of these materials from wastewater [2,3,4,5,6,7,8]. Considering the recent trends in attaining environmental sustainability, scientists are concentrating on utilizing naturally available materials to produce low-cost green adsorbents for the efficient removal of hazardous materials from wastewater [12,13]

Methods

Results

Discussion

Conclusion