TY - JOUR
T1 - Insights into aqueous carbofuran removal by modified and non-modified rice husk biochars
AU - Mayakaduwa, S. S.
AU - Herath, Indika
AU - Ok, Yong Sik
AU - Mohan, Dinesh
AU - Vithanage, Meththika
N1 - Funding Information:
This study is supported by MTR/TRD/AGR/3/1/8, Indo-Sri Lanka bilateral research grant sanctioned by the Ministry of Technology, Research and Atomic Energy, Sri Lanka and the Department of Science and Technology (DST), Government of India.
Funding Information:
Acknowledgments This study is supported by MTR/TRD/AGR/3/1/8, Indo-Sri Lanka bilateral research grant sanctioned by the Ministry of Technology, Research and Atomic Energy, Sri Lanka and the Department of Science and Technology (DST), Government of India.
Publisher Copyright:
© 2016, Springer-Verlag Berlin Heidelberg.
PY - 2017/10/1
Y1 - 2017/10/1
N2 - Biochar has been considered as a potential sorbent for removal of frequently detected pesticides in water. In the present study, modified and non-modified rice husk biochars were used for aqueous carbofuran removal. Rice husk biochars were produced at 300, 500, and 700 °C in slow pyrolysis and further exposed to steam activation. Biochars were physicochemically characterized using proximate, ultimate, FTIR methods and used to examine equilibrium and dynamic adsorption of carbofuran. Increasing pyrolysis temperature led to a decrease of biochar yield and increase of porosity, surface area, and adsorption capacities which were further enhanced by steam activation. Carbofuran adsorption was pH-dependant, and the maximum (161 mg g−1) occurred in the vicinity of pH 5, on steam-activated biochar produced at 700 °C. Freundlich model best fitted the sorption equilibrium data. Both chemisorption and physisorption interactions on heterogeneous adsorbent surface may involve in carbofuran adsorption. Langmuir kinetics could be applied to describe carbofuran adsorption in a fixed bed. A higher carbofuran volume was treated in a column bed by a steam-activated biochar versus non-activated biochars. Overall, steam-activated rice husk biochar can be highlighted as a promising low-cost sustainable material for aqueous carbofuran removal.
AB - Biochar has been considered as a potential sorbent for removal of frequently detected pesticides in water. In the present study, modified and non-modified rice husk biochars were used for aqueous carbofuran removal. Rice husk biochars were produced at 300, 500, and 700 °C in slow pyrolysis and further exposed to steam activation. Biochars were physicochemically characterized using proximate, ultimate, FTIR methods and used to examine equilibrium and dynamic adsorption of carbofuran. Increasing pyrolysis temperature led to a decrease of biochar yield and increase of porosity, surface area, and adsorption capacities which were further enhanced by steam activation. Carbofuran adsorption was pH-dependant, and the maximum (161 mg g−1) occurred in the vicinity of pH 5, on steam-activated biochar produced at 700 °C. Freundlich model best fitted the sorption equilibrium data. Both chemisorption and physisorption interactions on heterogeneous adsorbent surface may involve in carbofuran adsorption. Langmuir kinetics could be applied to describe carbofuran adsorption in a fixed bed. A higher carbofuran volume was treated in a column bed by a steam-activated biochar versus non-activated biochars. Overall, steam-activated rice husk biochar can be highlighted as a promising low-cost sustainable material for aqueous carbofuran removal.
KW - Activated carbon
KW - Agricultural by-product
KW - Dynamic adsorption
KW - Pesticide
KW - Pyrolysis
KW - Steam activation
UR - http://www.scopus.com/inward/record.url?scp=84983410562&partnerID=8YFLogxK
U2 - 10.1007/s11356-016-7430-6
DO - 10.1007/s11356-016-7430-6
M3 - Article
C2 - 27553000
AN - SCOPUS:84983410562
SN - 0944-1344
VL - 24
SP - 22755
EP - 22763
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 29
ER -