TY - JOUR
T1 - Experimental and theoretical aspects of biochar-supported nanoscale zero-valent iron activating H2O2 for ciprofloxacin removal from aqueous solution
AU - Mao, Qiming
AU - Zhou, Yaoyu
AU - Yang, Yuan
AU - Zhang, Jiachao
AU - Liang, Lifen
AU - Wang, Hailong
AU - Luo, Shuang
AU - Luo, Lin
AU - Jeyakumar, Paramsothy
AU - Ok, Yong Sik
AU - Rizwan, Muhammad
N1 - Funding Information:
Funding from National Key research and development Projects of China (2016YFC0403002), and the National Nature Science Foundation of China (21806035, 21806003), Nature Science Foundation of Hunan province (2019JJ50226) and Hunan Provincial Key Research and Development (2018WK4007) is gratefully acknowledged.
Funding Information:
Funding from National Key research and development Projects of China ( 2016YFC0403002 ), and the National Nature Science Foundation of China ( 21806035, 21806003 ), Nature Science Foundation of Hunan province ( 2019JJ50226 ) and Hunan Provincial Key Research and Development ( 2018WK4007 ) is gratefully acknowledged.
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/12/15
Y1 - 2019/12/15
N2 - Ciprofloxacin has been frequently detected in water environment, and its removal has become a significant public concern. Biochar-supported nanoscale zero-valent iron (BC/nZVI) to activate hydrogen peroxide (H2O2) has many advantages on promoting the removal of organic contaminants. In this paper, the BC/nZVI activating H2O2 degradation of ciprofloxacin was systematically investigated by experimental and theoretical approaches. The morphologies and property analysis showed that nZVI particles distributed uniformly on the biochar surface, which mainly include −OH, >C[dbnd]O and C[sbnd]O[sbnd]C and C[sbnd]O groups. Different reaction conditions were compared to define the optimal conditions for ciprofloxacin removal in BC/nZVI/H2O2 system. More than 70% of ciprofloxacin was removed in the optimal conditions: acidic condition (pH 3∼4), low doses of H2O2 (20 mM), and temperature of 298 K. The hydroxyl radical (•OH) oxidation was the primary pathway in BC/nZVI/H2O2 degradation of ciprofloxacin process. The theoretical calculation indicated that hydrogen atom abstraction (HAA) pathways were the dominant oxidation pathways contributing 92.3% in overall second‒order rate constants (k) of •OH and ciprofloxacin. The current results are valuable to evaluate the application of BC/nZVI activating H2O2 degradation of ciprofloxacin and other fluoroquinolone antibiotics in water treatment plants.
AB - Ciprofloxacin has been frequently detected in water environment, and its removal has become a significant public concern. Biochar-supported nanoscale zero-valent iron (BC/nZVI) to activate hydrogen peroxide (H2O2) has many advantages on promoting the removal of organic contaminants. In this paper, the BC/nZVI activating H2O2 degradation of ciprofloxacin was systematically investigated by experimental and theoretical approaches. The morphologies and property analysis showed that nZVI particles distributed uniformly on the biochar surface, which mainly include −OH, >C[dbnd]O and C[sbnd]O[sbnd]C and C[sbnd]O groups. Different reaction conditions were compared to define the optimal conditions for ciprofloxacin removal in BC/nZVI/H2O2 system. More than 70% of ciprofloxacin was removed in the optimal conditions: acidic condition (pH 3∼4), low doses of H2O2 (20 mM), and temperature of 298 K. The hydroxyl radical (•OH) oxidation was the primary pathway in BC/nZVI/H2O2 degradation of ciprofloxacin process. The theoretical calculation indicated that hydrogen atom abstraction (HAA) pathways were the dominant oxidation pathways contributing 92.3% in overall second‒order rate constants (k) of •OH and ciprofloxacin. The current results are valuable to evaluate the application of BC/nZVI activating H2O2 degradation of ciprofloxacin and other fluoroquinolone antibiotics in water treatment plants.
KW - Advanced oxidation processes
KW - Biochar-supported
KW - Density functional theory
KW - Nanoscale zero-valent iron
UR - http://www.scopus.com/inward/record.url?scp=85068856445&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.120848
DO - 10.1016/j.jhazmat.2019.120848
M3 - Article
C2 - 31319334
AN - SCOPUS:85068856445
SN - 0304-3894
VL - 380
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 120848
ER -