Research on adsorption of antibiotic levofloxacin by N-doped biochar
A nitrogen-doped biochar with rich microporous structure and ulna-high specific surface area of 1 712 m2/g was prepared from sugarcane bagasse and used to study the adsorption behavior and mechanism of the broad-spectrum antibiotic levofloxacin(LEV)by NSB.The results show that the doped nitrogen is mainly present as pyridine nitrogen,pyrrole nitrogen,graphite nitrogen and nitrogen oxide.And NSB has a wide pH range and high adsorption capacity for LEV adsorption.Under the conditions of NSB dosage of 0.125 g/L,pH=7,adsorption temperature of 30 ℃ and adsorption time 120 min,the adsorption efficiency of LEV(30 mg/L)is 95％,and the adsorption capacity of NSB is 252 mg/g,which is 9.5 times of the adsorption capacity of undoped biochar.The adsorption process of LEV by NSB conforms to the pseudo-second-order kinetic model,and the adsorption belongs to the multilayer adsorption type.The mechanism of LEV adsorption by NSB mainly involves pore filling,hydrogen bond effect and π-π conjugation.NSB has excellent ad-sorption capacity for antibiotic LEV,and is a biochar material with potential applications.
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维普
