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Enhanced adsorptive removal of hexavalent chromium in aqueous media using chitosan-modified biochar: Synthesis, sorption mechanism, and reusability.
Environ Res. 2023 Aug 15; 231(Pt 1):115982.ER

Abstract

Hexavalent chromium (Cr(VI)) is deemed a priority contaminant owing to its carcinogenicity, teratogenicity, and mutagenicity towards flora and fauna. A novel Chitosan-modified Mimosa pigra biochar (CMPBC) was fabricated and the efficiency of Cr(VI) oxyanion removal in aqueous systems was compared with the pristine biochar. The instrumental characterization of X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) confirmed the amino modification of MPBC when treated with chitosan. Characteristic features of the Cr(VI) sorptive process by CMPBC and MPBC were examined by performing batch sorption studies. Experimental data suggested that sorption is heavily dependent on pH and the highest adsorption occurred at pH 3.0. The maximum adsorption capacity of CMPBC was 14.6 ± 1.07 mg g-1. It was further noted that the removal efficiency of CMPBC (92%) was considerably greater than that of MPBC (75%) when the solution pH, biochar dose, and initial concentration of Cr(VI) are 3.0, 1.0 g L-1 and 5.0 mg L-1 respectively. The kinetic data were best interpreted by the power function model (R2 = 0.97) suggesting a homogenous chemisorption process. The isotherm data for the removal of Cr(VI) by CMPBC was inferred well by Redlich Peterson (R2 = 0.96) and Temkin (R2 = 0.96) isotherms. Results of sorption-desorption regeneration cycles indicated that the Cr(VI) uptake by CMPBC is not fully reversible. The coexistence of Cr(VI) and Cr(III) on CMPBC was confirmed through the XPS analysis. The electrostatic attractions between cationic surface functionalities and Cr(VI) oxyanions, the partial reductive transformation of Cr(VI) species to Cr(III), as well as complexation of Cr(III) onto CMPBC were identified as the possible mechanisms of mitigation of Cr(VI) by CMPBC. The results and outcomes of this research suggest the possibility of utilizing the CMPBC as an easily available, environmentally sustainable, and inexpensive sorbent to decontaminate Cr(VI) from aqueous media.

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Authors+Show Affiliations

Perera HM
Department of Chemistry, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka; Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka.
Rajapaksha AU
Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka; Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka. Electronic address: anurajapaksha@sjp.ac.lk.
Liyanage S
Department of Chemistry, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka.
Ekanayake A
Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka.
Selvasembian R
Department of Environmental Science and Engineering, School of Engineering and Sciences, SRM University-AP, Amaravati, Andhra Pradesh, 522240, India.
Daverey A
School of Environment and Natural Resources, Doon University, Dehradun, Uttarakhand, 248012, India.
Vithanage M
Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka.

MeSH

ChitosanAdsorptionSpectroscopy, Fourier Transform InfraredWater Pollutants, ChemicalChromiumWaterKineticsHydrogen-Ion Concentration

Pub Type(s)

Journal Article

Language

eng

PubMed ID

37146934

Citation

Perera, Harini Methma, et al. "Enhanced Adsorptive Removal of Hexavalent Chromium in Aqueous Media Using Chitosan-modified Biochar: Synthesis, Sorption Mechanism, and Reusability." Environmental Research, vol. 231, no. Pt 1, 2023, p. 115982.
Perera HM, Rajapaksha AU, Liyanage S, et al. Enhanced adsorptive removal of hexavalent chromium in aqueous media using chitosan-modified biochar: Synthesis, sorption mechanism, and reusability. Environ Res. 2023;231(Pt 1):115982.
Perera, H. M., Rajapaksha, A. U., Liyanage, S., Ekanayake, A., Selvasembian, R., Daverey, A., & Vithanage, M. (2023). Enhanced adsorptive removal of hexavalent chromium in aqueous media using chitosan-modified biochar: Synthesis, sorption mechanism, and reusability. Environmental Research, 231(Pt 1), 115982. https://doi.org/10.1016/j.envres.2023.115982
Perera HM, et al. Enhanced Adsorptive Removal of Hexavalent Chromium in Aqueous Media Using Chitosan-modified Biochar: Synthesis, Sorption Mechanism, and Reusability. Environ Res. 2023 Aug 15;231(Pt 1):115982. PubMed PMID: 37146934.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Enhanced adsorptive removal of hexavalent chromium in aqueous media using chitosan-modified biochar: Synthesis, sorption mechanism, and reusability. AU - Perera,Harini Methma, AU - Rajapaksha,Anushka Upamali, AU - Liyanage,Sudantha, AU - Ekanayake,Anusha, AU - Selvasembian,Rangabhashiyam, AU - Daverey,Achlesh, AU - Vithanage,Meththika, Y1 - 2023/05/04/ PY - 2023/1/14/received PY - 2023/3/25/revised PY - 2023/4/22/accepted PY - 2023/6/19/medline PY - 2023/5/6/pubmed PY - 2023/5/5/entrez KW - Chemical modification KW - Engineered biochar KW - Heavy metal KW - Sorption SP - 115982 EP - 115982 JF - Environmental research JO - Environ Res VL - 231 IS - Pt 1 N2 - Hexavalent chromium (Cr(VI)) is deemed a priority contaminant owing to its carcinogenicity, teratogenicity, and mutagenicity towards flora and fauna. A novel Chitosan-modified Mimosa pigra biochar (CMPBC) was fabricated and the efficiency of Cr(VI) oxyanion removal in aqueous systems was compared with the pristine biochar. The instrumental characterization of X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FT-IR) confirmed the amino modification of MPBC when treated with chitosan. Characteristic features of the Cr(VI) sorptive process by CMPBC and MPBC were examined by performing batch sorption studies. Experimental data suggested that sorption is heavily dependent on pH and the highest adsorption occurred at pH 3.0. The maximum adsorption capacity of CMPBC was 14.6 ± 1.07 mg g-1. It was further noted that the removal efficiency of CMPBC (92%) was considerably greater than that of MPBC (75%) when the solution pH, biochar dose, and initial concentration of Cr(VI) are 3.0, 1.0 g L-1 and 5.0 mg L-1 respectively. The kinetic data were best interpreted by the power function model (R2 = 0.97) suggesting a homogenous chemisorption process. The isotherm data for the removal of Cr(VI) by CMPBC was inferred well by Redlich Peterson (R2 = 0.96) and Temkin (R2 = 0.96) isotherms. Results of sorption-desorption regeneration cycles indicated that the Cr(VI) uptake by CMPBC is not fully reversible. The coexistence of Cr(VI) and Cr(III) on CMPBC was confirmed through the XPS analysis. The electrostatic attractions between cationic surface functionalities and Cr(VI) oxyanions, the partial reductive transformation of Cr(VI) species to Cr(III), as well as complexation of Cr(III) onto CMPBC were identified as the possible mechanisms of mitigation of Cr(VI) by CMPBC. The results and outcomes of this research suggest the possibility of utilizing the CMPBC as an easily available, environmentally sustainable, and inexpensive sorbent to decontaminate Cr(VI) from aqueous media. SN - 1096-0953 UR - https://www.unboundmedicine.com/medline/citation/37146934/Enhanced_adsorptive_removal_of_hexavalent_chromium_in_aqueous_media_using_chitosan_modified_biochar:_Synthesis_sorption_mechanism_and_reusability_ DB - PRIME DP - Unbound Medicine ER -