Chitosan-based nanocomposites for removal of Cr(VI) and synthetic food colorants from wastewater

Shivangi Singh; Emmanuvel Arputharaj; Hans-Uwe Dahms; Anil Kumar Patel; Yeou-Lih Huang

doi:10.1016/j.biortech.2022.127018

Chitosan-based nanocomposites for removal of Cr(VI) and synthetic food colorants from wastewater

Bioresour Technol. 2022 May:351:127018. doi: 10.1016/j.biortech.2022.127018. Epub 2022 Mar 17.

Authors

Shivangi Singh¹, Emmanuvel Arputharaj¹, Hans-Uwe Dahms², Anil Kumar Patel³, Yeou-Lih Huang⁴

Affiliations

¹ Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan.
² Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Marine Biotechnology and Resources, National Sun Yat-Sen University, Kaohsiung, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
³ Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan; Sustainable Environment Research Center, National Kaohsiung University of Science and Technology, Kaohsiung City 81157, Taiwan; Centre for Energy and Environmental Sustainability, Lucknow 226 029, Uttar Pradesh, India.
⁴ Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan; Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan. Electronic address: yelihu@kmu.edu.tw.

PMID: 35307519
DOI: 10.1016/j.biortech.2022.127018

Abstract

Current study aims to synthesize chitosan/polyvinyl alcohol (CS/PVA), poly(ethyleneimine), and Fe₃O₄ impregnated beads for co-removal of Cr(VI) and toxic azo-dyes from wastewater. The mesoporous PEI@AC@Fe₃O₄ exhibits magnetism and enhanced physisorption by higher specific-porosity (2.1 nm) from Cr(VI) radii (0.044 nm). Moreover, surface functional groups (-OH, -NH, -NH₂, -COOH etc.), especially amines enhance ionic bonding due to positive zeta potential. Hence, it is unique for anionic dyes removal under a wide pH range. It showed maximum adsorption capacity 98, 85.5, 85.8, and 91%, or 199.8, 148, 167, 176.5 mg g^-1 respectively for Cr(VI), tartrazine, sunset yellow, and erythrosine. Surface adsorption of Cr(VI) and its transition into Cr(III) was confirmed by EDX. Langmuir isotherm and pseudo-first-order kinetics best fit the adsorption of Cr(VI) and azo-dyes confirming their monolayer physisorption on adsorbent surface. Synthesized adsorbent examined in wastewater purification prototype for efficient removal of different simulated wastewaters confirms its potential for real-world applications.

Keywords: Anionic dye; Bioremediation; Chitosan; Cr(VI); PEI@AC@Fe(3)O(4).

MeSH terms

Adsorption
Chitosan*
Chromium / analysis
Coloring Agents
Food Coloring Agents*
Hydrogen-Ion Concentration
Kinetics
Nanocomposites*
Wastewater
Water Pollutants, Chemical* / analysis
Water Purification*

Substances

Coloring Agents
Food Coloring Agents
Waste Water
Water Pollutants, Chemical
Chromium
chromium hexavalent ion
Chitosan