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New mechanistic insight into rapid adsorption of pharmaceuticals from water utilizing activated biochar

Authors
Maged, AliDissanayake, Pavani DulanjaYang, XiaoPathirannahalage, CharithaBhatnagar, AmitOk, Yong Sik
Issue Date
11월-2021
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Keywords
Adsorption; Biochar; Diclofenac; Levofloxacin; Waste valorization; Water treatment
Citation
ENVIRONMENTAL RESEARCH, v.202
Indexed
SCIE
SCOPUS
Journal Title
ENVIRONMENTAL RESEARCH
Volume
202
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137651
DOI
10.1016/j.envres.2021.111693
ISSN
0013-9351
Abstract
The presence of emerging pollutants especially hazardous chemicals and pharmaceuticals in aquatic environments is a matter of grave concern to human health and the environment. In this study, coffee bean waste (CBW) was utilized to synthesize pristine (CBW550) and activated (CBWHPO550 ) biochars for the elimination of diclofenac (DF) and levofloxacin (LEV) from water. A facile two-step approach was used to synthesize CBWHPO 550 using chemical pretreatment and pyrolysis under N2 purging. BET results of CBWHPO 550 revealed that chemical pretreatment increased surface area by approximately 160 times compared to CBW550. The calculated ID/IG ratio from Raman spectra confirmed that CBWHPO550 had a high functionalized surface. Different operational parameters such as contact time, pH, adsorbent dose, ionic strength, and adsorbate concentration were studied and optimized. Maximum Langmuir adsorption capacity of CBWHPO 550 was found to be 61.17 and 110.70 mg/g for DF and LVX, respectively. Experimental results demonstrated that presence of NaCl in solution enhanced DF removal efficiency due to the salting-out effect. Electrostatic attraction, pi - pi bonding, and hydrophobic interaction were prominently responsible mechanisms for the adsorption of DF and LVX. Furthermore, continuous-flow mode studies confirmed that CBWHPO
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