Adsorption of ofloxacin from aqueous solution using low-cost biochar obtained from cotton stalk

作者：Du, Yuan-da; Liu, Hong-qiang; Shu, Li; Feng, Yu; Kong, Qiang^*; Xu, Fei; Wang, Qian; Zhao, Cong-cong

来源：Desalination and Water Treatment, 2018, 135: 372-380.

DOI：10.5004/dwt.2018.23299

• Cotton stalk
• Biochar
• Ofloxacin
• Adsorption

Biochar (BC) obtained from cotton stalk was used to adsorb ofloxacin (OFL) from aqueous solution. The BC had a high surface area of 1196.24 m(2)/g and adsorbed a maximum of 769.2 mg/g of OFL, and the adsorption kinetics were best represented by a pseudo-second-order kinetic model (R-2 > 0.998), suggesting chemisorption control. The equilibrium adsorption data were well described by the Freundlich model (R-2 > 0.996), indicating a multilayer adsorption process. Additionally, thermodynamic simulation indicated that the adsorption was exothermic. Finally, FTIR spectra of the BC revealed the presence of phosphorus-containing functional groups and C=O, C=C, C-O-C, P=O, P-O-C, and O-C bonds on the BC surface. Our findings indicate that BC from cotton stalk can be applied for the treatment of antibiotic-containing wastewater.

• 出版日期2018-12
• 单位山东师范大学