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Engineered tea-waste biochar for the removal of caffeine, a model compound in pharmaceuticals and personal care products (PPCPs), from aqueous media

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dc.contributor.author Keerthanan, S
dc.contributor.author Bhatnagar, A
dc.contributor.author Mahatantila, K
dc.contributor.author Jayasinghe, C
dc.contributor.author Vithanage, M
dc.date.accessioned 2020-08-27T06:50:59Z
dc.date.available 2020-08-27T06:50:59Z
dc.date.issued 2020
dc.identifier.citation Keerthanan, S, et al.(2020)."Engineered tea-waste biochar for the removal of caffeine, a model compound in pharmaceuticals and personal care products (PPCPs), from aqueous media",Environmental Technology & Innovation 19 (2020) 100847 en_US
dc.identifier.uri http://dr.lib.sjp.ac.lk/handle/123456789/9064
dc.description.abstract This study aimed to synthesize engineered tea-waste biochar, pyrolyzed at 700 ◦C using steam activation (TWBC-SA) for caffeine (CFN) removal from aqueous media. The morphological features and available functional groups on the surface of biochar were characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). Adsorption batch experiments were carried out at various pH values (3–10), contact time (up to 24 h), and initial concentration of CFN (10–300 mg L−1) using 1 g L−1 of TWBC-SA at 25 ◦C. SEM images showed the distribution of well-developed pores on the surface of biochar. FTIR spectra revealed that the surface of TWBC-SA provided extra aromatic character, which was further confirmed by XPS analysis. pH-adsorption edge data showed a maximum adsorption capacity of 15.4 mg g−1at pH 3.5. The experimental data were best-fitted to the non-linear Elovich kinetic model, demonstrating the contribution of chemical forces for adsorption of CFN onto the heterogeneous surface of TWBC-SA (initial rate of adsorption = 55.6 mg g−1min−1). Non-linear forms of Freundlich and Temkin isotherm models were fitted with the experimental data, describing favorability of chemical interactions between CFN and TWBC-SA. Finally, it is demonstrated that the adsorption of CFN by TWBC-SA is mainly governed by the chemisorption mechanism via electrostatic interactions and nucleophilic attraction. Thus, the engineered steam-activated tea-waste biochar has a high potential for adsorbing CFN from water. en_US
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Caffeine Tea waste Water treatment Micropollutant Stimulant drug Engineered biochar en_US
dc.title Engineered tea-waste biochar for the removal of caffeine, a model compound in pharmaceuticals and personal care products (PPCPs), from aqueous media en_US
dc.type Article en_US
dc.identifier.doi 10.1016/j.eti.2020.100847 en_US


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