Abstract
Herein, we have reported the synthesis of a potential bentonite/silver nanoparticles-Alginate (Bent/AgNPs-Alg) bio-nanocomposite and its possible application to adsorb methylene blue (MB) dye from an aqueous solution. Different analytical methods, such as SEM–EDX, TEM, FTIR, and XRD, were used to analyze the surface morphology of the bio-nanocomposite. The specific surface area of (Bent/Ag-Alg) bio-nanocomposite based on monolayer coverage was found to be 562.66 m2.g−1. The maximum adsorption was observed at the optimum condition (equilibrium time 180 min, adsorbent dose 0.5 g.L−1, pH 8 and initial concentration 100 mg.L−1). The Langmuir isotherm best fits the experimental data, with the highest correlation coefficient constant (R2) 0.986, 0.989 and 0.973 at 303, 313 and 323 K, respectively. The maximum monolayer adsorption capacity (qmax) was recorded as 242.56 mg.g−1. Based on the highest correlation coefficient (R2) 0.961, 0.943, and 0.975 at 50, 100, and 150 mg.L−1, respectively, pseudo-second-order kinetics best obeyed the experimental data. The positive value of ΔHº (54.828 kJ.mol−1) and ΔSº (0.215 kJ.mol−1.K−1) confirmed that the adsorption was endothermic and spontaneous. The breakthrough and exhaustion capacity was observed at 200.00 and 680.00 mg.g−1, respectively. 0.1 N HCl solution was used for desorption of the adsorbed MB dye. The spent adsorbent can be regenerated successfully up to the 6th cycle. Therefore, Bent/AgNPs-Alg bio-nanocomposite could be harnessed as a potential adsorbent to remove hazardous MB dye from the wastewater.
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Data availability
The data supporting this study’s findings are available on request from the corresponding author (Dr. Rais Ahmad). The data is not publicly available due to (state restrictions, e.g., “them containing information that could compromise research participant's privacy/consent”).
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Acknowledgements
The authors are grateful for the research facilities provided by the Chairman, Department of Applied Chemistry, AMU, Aligarh, India. We also thank USIF, AMU, for the SEM/EDX and TEM facilities and the Department of Physics, AMU, for the XRD facility.
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We express our sincere gratitude to UGC, New Delhi, for giving financial support to Mr. Mohammad Osama Ejaz.
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Rais Ahmad: conceptualization, supervision, visualization, funding acquisition, data curation, writing—review and editing. Mohammad Osama Ejaz: methodology, formal analysis, software, validation, writing—original draft. The authors read and approved the final manuscript.
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Highlights
• A novel and potential (Bent/AgNPs-Alg) bio-nanocomposite has been synthesized.
• The maximum monolayer adsorption capacity (qmax) was recorded as 242.56 mg.g−1.
• The Langmuir isotherm and pseudo second order kinetic model obeyed the experimental data.
• The Bent/AgNPs-Alg adsorbent can be regenerated successfully up to the 6th cycle.
Novelty statement
A novel and potential (Bent/AgNPs-Alg) bio-nanocomposite has been synthesized by the green method for the first time and has not been reported in literature till now. The bio-nanocomposite showed an excellent adsorption capacity of 242.56 mg.g−1 for the removal of MB dye. The spent adsorbent was successfully regenerated up to the 6th cycle, making the treatment process economical and eco-friendly in developing countries.
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Ahmad, R., Ejaz, M.O. Adsorption of methylene blue dye from aqueous solution onto synthesized bentonite/silvernanoparticles-alginate (Bent/AgNPs-Alg) bio-nanocomposite. Biomass Conv. Bioref. (2022). https://doi.org/10.1007/s13399-022-03350-y
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DOI: https://doi.org/10.1007/s13399-022-03350-y