Adsorption of pharmaceutical pollutants on ZnCl_(2)-activated biochar from corn cob:Efficiency,selectivity and mechanism

查看全文 作　　者：Christian [1,2]F.Varela;L.C.Moreno-[1]Aldana;Yazmin Yaneth Agámez-[1]Pertuz

机构地区：[1]Department of Chemistry,National University of Colombia,Av.Carrera 30 No.45-03,Bogotá,D.C.,Colombia;[2]Department of Biology and Chemistry,University of the Llanos,km 12 road to Puerto López,Villavicencio,Colombia

出　　处：《Journal of Bioresources and Bioproducts》索引2024年第9卷第1期,共16页

基　　金：support for this research by Research System of the Universidad Nacional de Colombia (No.51275). 摘　　要：The occurrence of pharmaceuticals in water bodies and drinking water poses risks for the envi-ronment and human health,thus it is necessary to study methodologies that allow the efficient removal of these contaminants.In this work,corn cob-derived biochar was obtained by ZnCl_(2)-activation,and subsequent carbonization at 700℃.The effect of contact time,temperature,pH,and initial concentration on the adsorption capacity of acetaminophen(ACE)and amoxicillin(AMX)was determined through batch experiments.In addition,the kinetics,isotherms,and ther-modynamics parameters were determined.The activated biochar exhibited a maximum adsorp-tion capacity of 332.08 mg/g for ACE and 175.86 mg/g for AMX.The adsorption kinetics and adsorption isotherm of ACE corresponded to the pseudo-second order and Langmuir model,re-spectively.Meanwhile,pseudo-first-order kinetics and the Freundlich isotherm model were well-fitted to AMX adsorption.The ACE and AMX co-adsorption had a synergistic effect on AMX but an antagonistic effect on ACE removal,achieving a maximum adsorption capacity of 193.51 and 184.58 mg/g,respectively.On the other hand,fixed-bed column experiments showed that the adsorption capacity depends on the influent concentration,and the breakthrough curve fits the Thomas and Yoon-Nelson model.The mechanism adsorption studies showed that surface inter-actions(hydrogen bonding formation and n-��interactions)are the main driving forces for the adsorption process,and pore filling is the rate-limiting step.In this way,the prepared biochar exhibits a high potential for the adsorption of pharmaceutical compounds from water. 关键词：BIOCHAR ADSORPTION ACETAMINOPHEN AMOXICILLIN Wastewater treatment

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Adsorption of pharmaceutical pollutants on ZnCl_(2)-activated biochar from corn cob:Efficiency,selectivity and mechanism

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