In order to efficiently adsorb enrofloxacin(EFA)in water,coconut shell biochar(BM-KOH-BC)was pre-pared by modifying coconut shell through ball milling and KOH activation,and in-depth research was conducted on the adsorption of EFA.BM-KOH-BC was characterized by scanning electron microscopy,Fourier transform infrared spectroscopy,and X-ray diffraction.The results revealed that KOH activation and ball milling modification significantly improved the pore structure and specific surface area of BM-KOH-BC.Under optimized conditions(Initial EFA concentration is 80 mg·L-1,pH value is 7,temperature is 25℃,adsorbent dosage is 0.14 g·mg·L-1,stirring speed is 200 r/min,contact time under the conditions of 35 h),BM-KOH-BC showed good adsorption per-formance,with a removal rate of 77.4%and a maximum adsorption capacity of 481.1 mg·g-1.The adsorption pro-cess is consistent with the second-order kinetic model and Freundlich isotherm model.In addition,BM-KOH-BC still maintains efficient EFA removal rate after 5 adsorption-desorption cycles.This low-cost,efficient adsorption and recyclability feature makes BM-KOH-BC show potential application prospects in treating EFA in water bodies.
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