Adsorption of pharmaceuticals from aqueous solutions using biochar derived from cotton gin waste and guayule bagasse

作     者：Marlene C.Ndoun Herschel AElliott Heather EPreisendanz Clinton FWilliams Allan Knopf John EWatson 

作者机构：Department of Agricultural and Biological EngineeringThe Pennsylvania State University243 Agricultural Engineering BuildingUniversity ParkPA 16802USA USDA-ARS Arid Lands Agricultural Research CenterMaricopaAZ 85138USA Department of Ecosystem Science and ManagementThe Pennsylvania State UniversityUniversity ParkPA 16802USA 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2021年第3卷第1期

页      面：89-104页

核心收录：

学科分类：0831[工学-生物医学工程（可授工学、理学、医学学位）] 083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 08[工学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0706[理学-大气科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0901[农学-作物学] 

基　　金：Support of M.C.Ndoun through a USDA-ARS Cooperative Agreement is gratefully acknowledged.H.A.Elliott,H.E.Preisendanz(formerly,Gall) J.E.Watson are supported,in part,by the USDA National Institute of Food and Agriculture Federal Appropriations under Project PEN04574 and Accession number 1004448 

主　　题：adsorption Adsorption adsorbent 

摘      要：Biochars produced from cotton gin waste(CG)and guayule bagasse(GB)were characterized and explored as potential adsorbents for the removal of pharmaceuticals(sulfapyridine-SPY,docusate-DCT and erythromycin-ETM)from aqueous *** increase in biochar pyrolysis temperature from 350οC to 700℃ led to an increase in pH,specific surface area,and surface *** electronegative surface of all tested biochars indicated that non-Coulombic mechanisms were involved in adsorption of the anionic or uncharged pharmaceuticals under experimental *** adsorption capacities of Sulfapyridine(SPY),Docusate(DCT)and Erythromycin(ETM)on biochar were influenced by the contact time and solution pH,as well as biochar specific surface area and functional *** of these pharmaceutical compounds was dominated by a complex interplay of three mechanisms:hydrophobic partitioning,hydrogen bonding andπ-πelectron donor-acceptor(EDA)*** weakerπ-πEDA interactions,reduced hydrophobicity of SPY−and increased electrostatic repulsion between anionic SPY−and the electronegative CG biochar surface at higher pH,the adsorption of SPY unexpectedly increased from 40% to 70% with an increase in pH from 7 to *** alkaline conditions,adsorption was dominated by the formation of strong negative charge-assisted H-bonding between the sulfonamide moiety of SPY and surface carboxylic *** seemed to be no appreciable and consistent differences in the extent of DCT and ETM adsorption as the pH *** suggest the CG and GB biochars could act as effective adsorbents for the removal of pharmaceuticals from reclaimed water prior to *** surface area biochars with physico-chemical properties(e.g.,presence of functional groups,high cation and anion exchange capacities)conducive to strong interactions with polar-nonpolar functionality of pharmaceuticals could be used to achieve significant contaminant removal from water.