A study of phosphate adsorption by different temperature treated hydrous cerium oxides
来源期刊：Rare Metals2011年第1期
论文作者：GUO Huichaoa,LI Wenjunb,WANG Huanyinga,ZHANG Jinghuac,LIU Yangc,and ZHOU Yuec a School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing ,China b School of Applied Science,University of Science and Technology Beijing,Beijing ,China c Beijing Center for Physical and Chemical Analysis,Beijing ,China
文章页码：58 - 62
摘 要：An alkaline precipitation method was introduced to produce hydrous cerium oxides.The prepared powder was characterized by Brunauer-Emmett-Teller（BET） nitrogen adsorption-desorption,X-ray diffraction（XRD）,Fourier transform infrared（FTIR） spectrometry,and thermal gravimetry（TG） approaches.The adsorbent has a chemical formula of CeO2·nH2O（n < 2） and a cubic fluorite-type structure after high temperature treatment.Adsorption capacity of different temperature treated hydrous cerium oxides does not directly correlate with BET specific surface area.Phosphate adsorption isotherms follow the Langmuir equation below the treatment temperature of 800°C.Phosphate adsorption causes no change on the structure of a hydrous cerium oxides,and no signs of CePO4 precipitates are found.The ion-exchanging structure of hydrous cerium oxide plays a fundamental role in phosphate adsorption.The structure is highly temperature resistant and forms adsorption sites which adsorb both water and some anions.Complete loss of adsorption ability cannot be achieved unless the treatment temperature is higher than 1200°C.Mechanism study shows that the adsorption of phosphates is mainly an anion-exchange process.
GUO Huichaoa,LI Wenjunb,WANG Huanyinga,ZHANG Jinghuac,LIU Yangc,and ZHOU Yuec a School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China b School of Applied Science,University of Science and Technology Beijing,Beijing 100083,China c Beijing Center for Physical and Chemical Analysis,Beijing 100089,China
摘 要：An alkaline precipitation method was introduced to produce hydrous cerium oxides.The prepared powder was characterized by Brunauer-Emmett-Teller（BET） nitrogen adsorption-desorption,X-ray diffraction（XRD）,Fourier transform infrared（FTIR） spectrometry,and thermal gravimetry（TG） approaches.The adsorbent has a chemical formula of CeO2·nH2O（n < 2） and a cubic fluorite-type structure after high temperature treatment.Adsorption capacity of different temperature treated hydrous cerium oxides does not directly correlate with BET specific surface area.Phosphate adsorption isotherms follow the Langmuir equation below the treatment temperature of 800°C.Phosphate adsorption causes no change on the structure of a hydrous cerium oxides,and no signs of CePO4 precipitates are found.The ion-exchanging structure of hydrous cerium oxide plays a fundamental role in phosphate adsorption.The structure is highly temperature resistant and forms adsorption sites which adsorb both water and some anions.Complete loss of adsorption ability cannot be achieved unless the treatment temperature is higher than 1200°C.Mechanism study shows that the adsorption of phosphates is mainly an anion-exchange process.
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