TY - JOUR
T1 - New mechanistic insight into rapid adsorption of pharmaceuticals from water utilizing activated biochar
AU - Maged, Ali
AU - Dissanayake, Pavani Dulanja
AU - Yang, Xiao
AU - Pathirannahalage, Charitha
AU - Bhatnagar, Amit
AU - Ok, Yong Sik
N1 - Funding Information:
This work was supported by the Cooperative Research Program for Agriculture Science and Technology Development (Effects of plastic mulch wastes on crop productivity and agroenvironment, Project No. PJ01475801 ), Rural Development Administration , Republic of Korea and the National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIT ) (No. 2021R1A2C2011734 ). Authors also thank Emma van Wijlen, Rijn Ijssel College, The Netherlands, for her kind assistance in some lab experiments.
Publisher Copyright:
© 2021 Elsevier Inc.
PY - 2021/11
Y1 - 2021/11
N2 - 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 (CBW550HPO) biochars for the elimination of diclofenac (DF) and levofloxacin (LEV) from water. A facile two-step approach was used to synthesize CBW550HPO using chemical pretreatment and pyrolysis under N2 purging. BET results of CBW550HPO revealed that chemical pretreatment increased surface area by approximately 160 times compared to CBW550. The calculated ID/IG ratio from Raman spectra confirmed that CBW550HPO 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 CBW550HPO 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, π−π bonding, and hydrophobic interaction were prominently responsible mechanisms for the adsorption of DF and LVX. Furthermore, continuous-flow mode studies confirmed that CBW550HPO can be successfully utilized in large-scale treatment applications.
AB - 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 (CBW550HPO) biochars for the elimination of diclofenac (DF) and levofloxacin (LEV) from water. A facile two-step approach was used to synthesize CBW550HPO using chemical pretreatment and pyrolysis under N2 purging. BET results of CBW550HPO revealed that chemical pretreatment increased surface area by approximately 160 times compared to CBW550. The calculated ID/IG ratio from Raman spectra confirmed that CBW550HPO 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 CBW550HPO 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, π−π bonding, and hydrophobic interaction were prominently responsible mechanisms for the adsorption of DF and LVX. Furthermore, continuous-flow mode studies confirmed that CBW550HPO can be successfully utilized in large-scale treatment applications.
KW - Adsorption
KW - Biochar
KW - Diclofenac
KW - Levofloxacin
KW - Waste valorization
KW - Water treatment
UR - http://www.scopus.com/inward/record.url?scp=85110500299&partnerID=8YFLogxK
U2 - 10.1016/j.envres.2021.111693
DO - 10.1016/j.envres.2021.111693
M3 - Article
C2 - 34270992
AN - SCOPUS:85110500299
SN - 0013-9351
VL - 202
JO - Environmental Research
JF - Environmental Research
M1 - 111693
ER -
