Study On ZnO Nanoparticles Doped Modified Biochar Adsorb Ciprofloxacin

In addition to being widely used in animals and humans to treat microbial infections,antibiotics can also be used as feed additives to promote livestock growth.After the use of antibiotics,a large part of them are excreted in the form of maternal form or metabolite with urine and feces and enter the aquatic environment directly or after incomplete removal by the sewage treatment plant.At present,how to efficiently and quickly adsorb and remove antibiotics in the actual water environment is a hot and difficult point in the current water environment treatment.In this work,the use of biochar as an adsorbent to remove pollutants from the environment demonstrates the advantages of recycling waste resources.Due to unmodified biochar is limited by its low specific surface area(19 m²g^-1)and poor adsorption capacity.According to its easy to functionalized and modified,a novel simultaneous activated and magnetic ZnO doped biochar camphor leaves biochar for ciprofloxacin adsorption.Different ratio ZnCl₂ as a porogen was explored to obtain optimized pore structure and greater specific surface area.In addition,different pyrolysis temperatures and magnetization for the biochar were investigated.The results show that the mass ratio of ZnO to biochar is 2,and the calcination temperature is 650oC are the optimal conditions.The material prepared under this condition is a microporous material with a large surface area(915 m² g^-1).According to the results of Adsorption kinetics and Langmuir isothermal model,in the aqueous solution of ciprofloxacin,the modified biochar basically reached equilibrium for ciprofloxacin after 4 h and the maximum adsorption capacity of modified biochar to ciprofloxacin reached 449.4 mg L^-11 which was better than the same type of material.The adsorption mechanism was discussed in terms of physical adsorption and chemical adsorption involving intense?-?stacking interaction,electrostatic interaction,cation exchange interaction etc.The results of ionic strength adsorption experiments showed that sodium chloride had little effect on the adsorption capacity.Besides,the adsorption capacity of modified biochar did not decline significantly after 3 times regeneration which demonstrated good stability.To Sum up,the ZnO doped magnetic activated biochar has a large specific surface area,rapid adsorption ability,good adsorption effect,recycling potential and easy to collection in the practical application process.It provides a new way for the recycling and reuse of camphor leaves waste resources.