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Amino-functionalized biochars for the detoxification and removal of hexavalent chromium in aqueous media.
Environ Res. 2022 08; 211:113073.ER

Abstract

The objectives of the study were to evaluate and compare the efficacy of hexavalent chromium (Cr(VI)) removal by amino-modified (HDA-MPBC) and pristine biochar (MPBC) derived from an invasive plant Mimosa pigra. Prepared biochars were characterized and batch experiments were conducted to check the performance and the mechanisms of Cr(VI) removal. FTIR spectra revealed that the surface of HDA-MPBC is abundant with amino functional groups which was further confirmed by XPS analysis. The highest Cr(VI) removal for both HDA-MPBC (76%) and MPBC (62%) was observed at pH 3.0. The batch sorption data were well fitted to the Freundlich isotherm model and pseudo-second-order kinetic model, suggesting the involvement of both physisorption and chemisorption mechanisms for Cr(VI) removal. X-ray photoelectron spectroscopy studies showed that both Cr(VI) and Cr(III) were presented at the modified biochar surface after adsorption. These results indicated that the electrostatic attraction of Cr(VI) coupled with reduction of Cr(VI) to Cr(III) and complexation of Cr(III) ions with functional groups on HDA-MPBC as the most plausible mechanism for removal of Cr(VI) by modified biochar. Regeneration experiment concluded that adsorbed Cr(VI) onto the surface of HDA-MPBC had the least tendency of being desorbed in basic conditions. HDA-MPBC showed a high performance in adsorptive removal of Cr(VI) compared to pristine biochar signifying the amino modification to enhance adsorption performance of biochar in Cr(VI) removal from wastewater.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Ekanayake A
Ecosphere Resilience Research 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.
Selvasembian R
Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, 613401, India.
Vithanage M
Ecosphere Resilience Research Center, Faculty of Applied Sciences, University of Sri Jayewardenepura, Nugegoda, 10250, Sri Lanka; Sustainability Cluster, School of Engineering, University of Petroleum & Energy Studies, Dehradun, Uttarakhand, 248007, India.

MeSH

AdsorptionCharcoalChromiumKineticsWaterWater Pollutants, Chemical

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

35283075

Citation

Ekanayake, Anusha, et al. "Amino-functionalized Biochars for the Detoxification and Removal of Hexavalent Chromium in Aqueous Media." Environmental Research, vol. 211, 2022, p. 113073.
Ekanayake A, Rajapaksha AU, Selvasembian R, et al. Amino-functionalized biochars for the detoxification and removal of hexavalent chromium in aqueous media. Environ Res. 2022;211:113073.
Ekanayake, A., Rajapaksha, A. U., Selvasembian, R., & Vithanage, M. (2022). Amino-functionalized biochars for the detoxification and removal of hexavalent chromium in aqueous media. Environmental Research, 211, 113073. https://doi.org/10.1016/j.envres.2022.113073
Ekanayake A, et al. Amino-functionalized Biochars for the Detoxification and Removal of Hexavalent Chromium in Aqueous Media. Environ Res. 2022;211:113073. PubMed PMID: 35283075.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Amino-functionalized biochars for the detoxification and removal of hexavalent chromium in aqueous media. AU - Ekanayake,Anusha, AU - Rajapaksha,Anushka Upamali, AU - Selvasembian,Rangabhashiyam, AU - Vithanage,Meththika, Y1 - 2022/03/11/ PY - 2022/01/01/received PY - 2022/02/23/revised PY - 2022/03/02/accepted PY - 2022/3/15/pubmed PY - 2022/6/10/medline PY - 2022/3/14/entrez KW - Adsorption KW - Amino-functionalization KW - Biochar KW - Heavy metals KW - Invasive plants SP - 113073 EP - 113073 JF - Environmental research JO - Environ Res VL - 211 N2 - The objectives of the study were to evaluate and compare the efficacy of hexavalent chromium (Cr(VI)) removal by amino-modified (HDA-MPBC) and pristine biochar (MPBC) derived from an invasive plant Mimosa pigra. Prepared biochars were characterized and batch experiments were conducted to check the performance and the mechanisms of Cr(VI) removal. FTIR spectra revealed that the surface of HDA-MPBC is abundant with amino functional groups which was further confirmed by XPS analysis. The highest Cr(VI) removal for both HDA-MPBC (76%) and MPBC (62%) was observed at pH 3.0. The batch sorption data were well fitted to the Freundlich isotherm model and pseudo-second-order kinetic model, suggesting the involvement of both physisorption and chemisorption mechanisms for Cr(VI) removal. X-ray photoelectron spectroscopy studies showed that both Cr(VI) and Cr(III) were presented at the modified biochar surface after adsorption. These results indicated that the electrostatic attraction of Cr(VI) coupled with reduction of Cr(VI) to Cr(III) and complexation of Cr(III) ions with functional groups on HDA-MPBC as the most plausible mechanism for removal of Cr(VI) by modified biochar. Regeneration experiment concluded that adsorbed Cr(VI) onto the surface of HDA-MPBC had the least tendency of being desorbed in basic conditions. HDA-MPBC showed a high performance in adsorptive removal of Cr(VI) compared to pristine biochar signifying the amino modification to enhance adsorption performance of biochar in Cr(VI) removal from wastewater. SN - 1096-0953 UR - https://www.unboundmedicine.com/medline/citation/35283075/Amino_functionalized_biochars_for_the_detoxification_and_removal_of_hexavalent_chromium_in_aqueous_media_ DB - PRIME DP - Unbound Medicine ER -