Enhanced removal of sulfonamide antibiotics from water by phosphogypsum modified biochar composite  

作　　者：Zonghong Jiang Miao Chen Xinqing Lee Qianwei Feng Ning Cheng Xueyang Zhang Shengsen Wang Bing Wang 

机构地区：[1]College of Resources and Environmental Engineering,Guizhou University,Guiyang 50025,China [2]Key Laboratory of Karst Georesources and Environment,Ministry of Education,Guiyang 550025,China [3]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China [4]School of Environmental Engineering,Xuzhou University of Technology,Xuzhou 221018,China [5]College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225127,China

出　　处：《Journal of Environmental Sciences》2023年第8期174-186,共13页环境科学学报（英文版）

基　　金：supported by the Key Project of Science and Technology Department of Guizhou Province(No.ZK(2022)016);the Special Research Fund of Natural Science(Special Post)of Guizhou University(No.(2020)01);the Key Cultivation Program of Guizhou University(No.2019(08)).

摘　　要：Antibiotic pollution has become a global eco-environmental issue.To reduce sulfonamide antibiotics in water and improve resource utilization of solid wastes,phosphogypsummodified biochar composite(PMBC)was prepared via facile one-step from distillers grains,wood chips,and phosphogypsum.The physicochemical properties of PMBCwere characterized by scanning electron microscope(SEM),Fourier transform infrared spectroscopy(FTIR),Zeta potential,X-ray diffraction(XRD),etc.The influencing factors,adsorption behaviors,and mechanisms of sulfadiazine(SD)and sulfamethazine(SMT)onto PMBC were studied by batch and fixed bed column adsorption experiments.The results showed that the removal rates of SD and SMT increased with the increase of phosphogypsum proportion,while decreased with the increase of solution pH.The maximum adsorption capacities of modified distillers grain and wood chips biochars for SD were 2.98 and 4.18 mg/g,and for SMT were 4.40 and 8.91mg/g,respectively,which was 9.0–22.3 times that of pristine biochar.Fixed bed column results demonstrated that PMBC had good adsorption capacities for SD and SMT.When the solution flow rate was 2.0 mL/min and the dosage of PMBC was 5.0 g,the removal rates of SD and SMT by modified wood chips biochar were both higher than 50%in 4 hr.The main mechanisms of SD and SMT removal by PMBC are hydrogen bonding,π-πdonor-acceptor,electrostatic interaction,and hydrophobic interaction.This study provides an effective method for the removal of antibiotics in water and the resource utilization of phosphogypsum.

关 键 词：Modified biochar Solid waste ANTIBIOTICS PHOSPHOGYPSUM Fixed-bed adsorption 

分 类 号：TB332[一般工业技术—材料科学与工程] O647.3[理学—物理化学] X703[理学—化学]