Evaluation of the adsorption potential of titanium dioxide nanoparticles for arsenic removal

查看全文 作　　者：NABI [1]Deedar;ASLAM [1]Irfan;QAZI Ishtiaq [1]A

机构地区：[1]Institute of Environmental Science and Engineering, National University of Sciences and Technology, Rawalpindi 46000, Pakistan

出　　处：《Journal of Environmental Sciences》索引2009年第21卷第3期,共7页

摘　　要：The adsorption potential of titanium dioxide(TiO2) nanoparticles for removing arsenic from drinking water was evaluated.Pure and iron-doped TiO2 particles are synthesized via sol-gel method.The synthesized TiO2 nanoparticles were then immobilized on ordinary sand for adsorption studies.Adsorption isotherms were conducted on the synthesized nanoparticles as well as the sand coated with TiO2 nanoparticles under varying conditions of air and light,namely,the air-sunlight(A-SL),air-light(AL),air-dark(AD) and nitrogen-dark(ND).X-ray diffraction(XRD) analysis showed that the pure and iron-doped TiO2 nanoparticles were in 100% anatase crystalline phase with crystal sizes of 108 and 65 nm,respectively.Adsorption of arsenic on the three adsorbents was non-linear that could be described by the Freundlich and Langmuir adsorption models.Iron doping enhanced the adsorption capacity of TiO2 nanoparticles by arresting the grain growth and making it visible light responsive resulting in a higher affnity for arsenic.Similarly,the arsenic removal by adsorption on the sand coated with TiO2 nanoparticles was the highest among the three types of sand used.In all cases,As(V) was adsorbed more compared with As(Ⅲ).The solution pH appeared to be the most important factor in controlling the amount of arsenic adsorbed. 关键词：TIO2纳米粒子二氧化钛粒子吸附等温线脱砷评价 LANGMUIR 纳米TIO2 溶胶凝胶法

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Evaluation of the adsorption potential of titanium dioxide nanoparticles for arsenic removal

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