Abstract
Sugar molasses from agricultural waste could be a sustainable carbon source for the synthesis of graphene adsorbent introduced in this work. The sugar molasses was successfully converted to graphene-like material and subsequently coated on the sand as graphene sand composite (GSC), as proven by XRD, XPS, Raman spectroscopy, and SEM with EDX mapping analyses. The adsorption performance of GSC was evaluated against the removal of Tetracycline (TC) and methylene blue (MB) pollutants from an aqueous solution in a fixed bed column continuous-flow adsorption setup. The effect of different process conditions: bed height (4–12 cm), influent flow rate (3–7 mL/min), and contaminants’ concentration (50–150 ppm) was investigated. The results revealed that column performance was improved by increasing the bed depth and lowering the flow rate and concentration of the pollutants. The best removal efficiency was obtained when the bed height was 12 cm, the influent flow rate of 3 mL/min, and the pollutants’ initial concentration was 50 mg/L. Thomas, Adams-Bohart, and Yoon-Nelson models were attempted to fit the breakthrough curves. Regeneration of the GSC indicated the decline of breakthrough time from 240–280 to 180 min, reflecting the decrease in adsorptive sites due to the incomplete regeneration process. Overall, sugar molasses was shown to be a low-cost precursor for synthesizing valuable graphene material in the form of GSC, which can reduce the problem for industrial waste management of sugar molasses, and the GSC could be used as an adsorbent for environmental application.
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The work was funded by the ASEAN University Network/Southeast Asia Engineering Education Development Network (AUN/SEED-Net), Japan International Cooperation Agency (JICA).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Alireza Nouri and Ebrahim Mahmoudi. The first draft of the manuscript was written by Alireza Nouri and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Nouri, A., Mahmoudi, E., Ang, W.L. et al. Sugar molasses as a sustainable precursor for the synthesis of graphene sand composite adsorbent for tetracycline and methylene blue removal. Environ Sci Pollut Res 30, 98817–98831 (2023). https://doi.org/10.1007/s11356-022-21996-z
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DOI: https://doi.org/10.1007/s11356-022-21996-z