Engineered tea-waste biochar for the removal of caffeine, a model compound in pharmaceuticals and personal care products (PPCPs), from aqueous media
- Authors
- Keerthanan, S.; Bhatnagar, Amit; Mahatantila, Kushani; Jayasinghe, Chamila; Ok, Yong Sik; Vithanage, Meththika
- Issue Date
- 8월-2020
- Publisher
- ELSEVIER
- Keywords
- Caffeine; Tea waste; Water treatment; Micropollutant; Stimulant drug; Engineered biochar
- Citation
- ENVIRONMENTAL TECHNOLOGY & INNOVATION, v.19
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENVIRONMENTAL TECHNOLOGY & INNOVATION
- Volume
- 19
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/54270
- DOI
- 10.1016/j.eti.2020.100847
- ISSN
- 2352-1864
- Abstract
- This study aimed to synthesize engineered tea-waste biochar, pyrolyzed at 700 degrees 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 degrees 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(-1)at 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(-1)min(-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. (c) 2020 Published by Elsevier B.V.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.