Removal of As(V)in the presence of Cr(VI)in contaminated water from the Bajio region of Mexico using ferrihydrite-functionalized graphene oxide(GOFH):A case study  

作　　者：D.R.Joya-Cardenas J.P.Rodríguez-Caicedo M.A.Corona-Rivera N.Saldana-Robles C.E.Damian-Ascencio A.Saldana-Robles 

机构地区：[1]Graduate Program in Biosciences,University of Guanajuato,Irapuato,36500,Mexico [2]Facultad de Ingenierías y Tecnologías,Instituto Xerira,Universidad de Santander,Bucaramanga,680003,Colombia [3]Chemical Engineering,Unit Academic Multidisciplinary Region Altiplano UAMRA.Autonomous University of San Luis Potosí,Matehuala,San Luis Potosí,78000,Mexico [4]Department of Agricultural Engineering,University of Guanajuato,Irapuato,36500,Mexico [5]Department of Mechanical Engineering,University of Guanajuato,Salamanca,36800,Mexico [6]Mechanical Engineering Department,Virginia Tech,Blacksburg,VA,24061,USA

出　　处：《Emerging Contaminants》2024年第3期134-144,共11页新兴污染物（英文）

摘　　要：The presence of heavy metals such as arsenic(As)and chromium(Cr)can be considered one of the most toxic heavy metals.This study aims to develop and evaluate a graphene oxide(GO)based material functionalized with ferrihydrite for the removal of As(V)in the presence of Cr(VI).The adsorbent ferrihydrite-functionalized graphene oxide(GOFH)was characterized by SEM,FTIR,XRD,XPS,surface charge,BET and TGA.Individual adsorption capacities for As(V)and Cr(VI)were 160 and 66 mg g^(-1)respectively at pH 4 and 298 K,fitting the Langmuir model.In binary systems,GOFH adsorbed As(V)with an adsorption capacity of 137 mg g^(-1)in the presence of 20 mg L^(-1)Cr(VI)at room temperature.Thermodynamic analysis revealed an exothermic and spontaneous process.Additionally,GOFH effectively removed several coexisting anions from groundwater,including SO_(4)^(2-),CO_(3)^(2-)and Cl^(-).This work evidences the potential of GOFH for competitive adsorption of priority pollutants from complex matrices.The GOFH material represents a technically and economically viable technology for application in groundwater decontamination,as it requires inexpensive precursors and ambient conditions during synthesis and operation.

关 键 词：COMPETITION Ions Contamination Groundwater Adsorption capacity 

分 类 号：O64[理学—物理化学]