Municipal solid waste biochar-bentonite composite for the removal of antibiotic ciprofloxacin from aqueous media

Ahmed Ashiq; Nadeesh M. Adassooriya; Binoy Sarkar; Anushka Upamali Rajapaksha; Yong Sik Ok; Meththika Vithanage

doi:10.1016/j.jenvman.2019.02.006

Municipal solid waste biochar-bentonite composite for the removal of antibiotic ciprofloxacin from aqueous media

Ahmed Ashiq, Nadeesh M. Adassooriya, Binoy Sarkar, Anushka Upamali Rajapaksha, Yong Sik Ok, Meththika Vithanage

Research output: Contribution to journal › Article › peer-review

109 Citations (Scopus)

Abstract

This study investigates the adsorption of ciprofloxacin (CPX) onto a municipal solid waste derived biochar (MSW-BC) and a composite material developed by combining the biochar with bentonite clay. A bentonite-MSW slurry was first prepared at 1:5 ratio (w/w), and then pyrolyzed at 450 °C for 30 min. The composite was characterized by scanning electron microscopy (SEM), Powder X-ray diffraction (PXRD) and Fourier transform infrared (FTIR) spectroscopy before and after CPX adsorption. Batch experiments were conducted to assess the effect of pH, reaction time and adsorbate dosage. The SEM images confirmed successful modification of the biochar with bentonite showing plate like structures. The PXRD patterns showed changes in the crystalline lattice of both MSW-BC and the composite before and after CPX adsorption whereas the FTIR spectra indicated merging and widening of specific bands after CPX adsorption. The optimum CPX adsorption was achieved at pH 6, and the maximum adsorption capacity of the composite calculated via isotherm modeling was 190 mg/g, which was about 40% higher than the pristine MSW-BC. The Hill isotherm model along with pseudo-second order and Elovich kinetic models showed the best fit to the adsorption data. The most plausible mechanism for increased adsorption capacity is the increased active sites of the composites for CPX adsorption through induced electrostatic interactions between the functional groups of the composite and CPX molecules. The added reactive surfaces in the composite because of bentonite incorporation, and the intercalation of CPX in the clay interlayers improved the adsorption of CPX by the biochar-bentonite composite compared to the pristine biochar. Thus, MSW-BC-bentonite composites could be considered as a potential material for remediating pharmaceuticals in aqueous media.

Original language	English
Pages (from-to)	428-435
Number of pages	8
Journal	Journal of Environmental Management
Volume	236
DOIs	https://doi.org/10.1016/j.jenvman.2019.02.006
Publication status	Published - 2019 Apr 15

Bibliographical note

Funding Information:
Financial support from the grant ASP/01/RE/SCI/2017/83 from the Research Council, and the analytical support from the Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura,Sri Lanka, are acknowledged.

Funding Information:
Financial support from the grant ASP/01/RE/SCI/2017/83 from the Research Council, and the analytical support from the Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura,Sri Lanka , are acknowledged. Appendix A

Publisher Copyright:
© 2019 Elsevier Ltd

Keywords

Antibiotics
Clay composites
Emerging contaminants
Engineered biochar
Water treatment

ASJC Scopus subject areas

Environmental Engineering
Waste Management and Disposal
Management, Monitoring, Policy and Law

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jenvman.2019.02.006

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title = "Municipal solid waste biochar-bentonite composite for the removal of antibiotic ciprofloxacin from aqueous media",

abstract = "This study investigates the adsorption of ciprofloxacin (CPX) onto a municipal solid waste derived biochar (MSW-BC) and a composite material developed by combining the biochar with bentonite clay. A bentonite-MSW slurry was first prepared at 1:5 ratio (w/w), and then pyrolyzed at 450 °C for 30 min. The composite was characterized by scanning electron microscopy (SEM), Powder X-ray diffraction (PXRD) and Fourier transform infrared (FTIR) spectroscopy before and after CPX adsorption. Batch experiments were conducted to assess the effect of pH, reaction time and adsorbate dosage. The SEM images confirmed successful modification of the biochar with bentonite showing plate like structures. The PXRD patterns showed changes in the crystalline lattice of both MSW-BC and the composite before and after CPX adsorption whereas the FTIR spectra indicated merging and widening of specific bands after CPX adsorption. The optimum CPX adsorption was achieved at pH 6, and the maximum adsorption capacity of the composite calculated via isotherm modeling was 190 mg/g, which was about 40% higher than the pristine MSW-BC. The Hill isotherm model along with pseudo-second order and Elovich kinetic models showed the best fit to the adsorption data. The most plausible mechanism for increased adsorption capacity is the increased active sites of the composites for CPX adsorption through induced electrostatic interactions between the functional groups of the composite and CPX molecules. The added reactive surfaces in the composite because of bentonite incorporation, and the intercalation of CPX in the clay interlayers improved the adsorption of CPX by the biochar-bentonite composite compared to the pristine biochar. Thus, MSW-BC-bentonite composites could be considered as a potential material for remediating pharmaceuticals in aqueous media.",

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author = "Ahmed Ashiq and Adassooriya, {Nadeesh M.} and Binoy Sarkar and Rajapaksha, {Anushka Upamali} and Ok, {Yong Sik} and Meththika Vithanage",

note = "Funding Information: Financial support from the grant ASP/01/RE/SCI/2017/83 from the Research Council, and the analytical support from the Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura,Sri Lanka, are acknowledged. Funding Information: Financial support from the grant ASP/01/RE/SCI/2017/83 from the Research Council, and the analytical support from the Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura,Sri Lanka , are acknowledged. Appendix A Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

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doi = "10.1016/j.jenvman.2019.02.006",

language = "English",

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AU - Ashiq, Ahmed

AU - Adassooriya, Nadeesh M.

AU - Sarkar, Binoy

AU - Rajapaksha, Anushka Upamali

AU - Ok, Yong Sik

AU - Vithanage, Meththika

N1 - Funding Information: Financial support from the grant ASP/01/RE/SCI/2017/83 from the Research Council, and the analytical support from the Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura,Sri Lanka, are acknowledged. Funding Information: Financial support from the grant ASP/01/RE/SCI/2017/83 from the Research Council, and the analytical support from the Instrument Center, Faculty of Applied Sciences, University of Sri Jayewardenepura,Sri Lanka , are acknowledged. Appendix A Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/4/15

Y1 - 2019/4/15

N2 - This study investigates the adsorption of ciprofloxacin (CPX) onto a municipal solid waste derived biochar (MSW-BC) and a composite material developed by combining the biochar with bentonite clay. A bentonite-MSW slurry was first prepared at 1:5 ratio (w/w), and then pyrolyzed at 450 °C for 30 min. The composite was characterized by scanning electron microscopy (SEM), Powder X-ray diffraction (PXRD) and Fourier transform infrared (FTIR) spectroscopy before and after CPX adsorption. Batch experiments were conducted to assess the effect of pH, reaction time and adsorbate dosage. The SEM images confirmed successful modification of the biochar with bentonite showing plate like structures. The PXRD patterns showed changes in the crystalline lattice of both MSW-BC and the composite before and after CPX adsorption whereas the FTIR spectra indicated merging and widening of specific bands after CPX adsorption. The optimum CPX adsorption was achieved at pH 6, and the maximum adsorption capacity of the composite calculated via isotherm modeling was 190 mg/g, which was about 40% higher than the pristine MSW-BC. The Hill isotherm model along with pseudo-second order and Elovich kinetic models showed the best fit to the adsorption data. The most plausible mechanism for increased adsorption capacity is the increased active sites of the composites for CPX adsorption through induced electrostatic interactions between the functional groups of the composite and CPX molecules. The added reactive surfaces in the composite because of bentonite incorporation, and the intercalation of CPX in the clay interlayers improved the adsorption of CPX by the biochar-bentonite composite compared to the pristine biochar. Thus, MSW-BC-bentonite composites could be considered as a potential material for remediating pharmaceuticals in aqueous media.

AB - This study investigates the adsorption of ciprofloxacin (CPX) onto a municipal solid waste derived biochar (MSW-BC) and a composite material developed by combining the biochar with bentonite clay. A bentonite-MSW slurry was first prepared at 1:5 ratio (w/w), and then pyrolyzed at 450 °C for 30 min. The composite was characterized by scanning electron microscopy (SEM), Powder X-ray diffraction (PXRD) and Fourier transform infrared (FTIR) spectroscopy before and after CPX adsorption. Batch experiments were conducted to assess the effect of pH, reaction time and adsorbate dosage. The SEM images confirmed successful modification of the biochar with bentonite showing plate like structures. The PXRD patterns showed changes in the crystalline lattice of both MSW-BC and the composite before and after CPX adsorption whereas the FTIR spectra indicated merging and widening of specific bands after CPX adsorption. The optimum CPX adsorption was achieved at pH 6, and the maximum adsorption capacity of the composite calculated via isotherm modeling was 190 mg/g, which was about 40% higher than the pristine MSW-BC. The Hill isotherm model along with pseudo-second order and Elovich kinetic models showed the best fit to the adsorption data. The most plausible mechanism for increased adsorption capacity is the increased active sites of the composites for CPX adsorption through induced electrostatic interactions between the functional groups of the composite and CPX molecules. The added reactive surfaces in the composite because of bentonite incorporation, and the intercalation of CPX in the clay interlayers improved the adsorption of CPX by the biochar-bentonite composite compared to the pristine biochar. Thus, MSW-BC-bentonite composites could be considered as a potential material for remediating pharmaceuticals in aqueous media.

KW - Antibiotics

KW - Clay composites

KW - Emerging contaminants

KW - Engineered biochar

KW - Water treatment

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ER -

Municipal solid waste biochar-bentonite composite for the removal of antibiotic ciprofloxacin from aqueous media

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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