tailieunhanh - Study on adsorption of phosphate from aqueous solution by nanomaterial CeO2

The synthesis of nanosize single phase CeO2 by gelatine gel combustion method was investigated. The prepared material was characterized by X- ray diffraction, thermogravimetric and differential thermal analysis, scanning electron microscopy and transmission electron microscopy measurements. At optimum conditions, such as pH 3, the molar ratio of Ce4+ /gelatine 1/1, and a calcination temperature of 550 oC for 2 hours, the material with average size < 30 nm was synthesized. | Vietnam Journal of Chemistry, International Edition, 55(4): 499-503, 2017 DOI: Study on adsorption of phosphate from aqueous solution by nanomaterial CeO2 Dao Hong Duc1,4, Dao Ngoc Nhiem2*, Nguyen Quang Bac2, Do Quang Trung3 1 Graduate University of Science and Technology, Vietnam Academy of Science and Technology 2 Institute of Materials Science, Vietnam Academy of Science and Technology 3 Department of Chemistry, Hanoi University of Science, Vietnam National University 4 Bac Bo Water Resource College Received 28 December 2016; Accepted for publication 28 August 2017 Abstract The synthesis of nanosize single phase CeO2 by gelatine gel combustion method was investigated. The prepared material was characterized by X- ray diffraction, thermogravimetric and differential thermal analysis, scanning electron microscopy and transmission electron microscopy measurements. At optimum conditions, such as pH 3, the molar ratio of Ce4+/gelatine 1/1, and a calcination temperature of 550 oC for 2 hours, the material with average size < 30 nm was synthesized. From the results of phosphate adsorption, adsorption equilibrium time of the material was determined at 60 minutes. The phosphate adsorption process in aqueous solution followed the Langmuir isothermal model with Qmax= mg/g. Keywords. CeO2, gelatine, combustion method, phosphate (PO43-) adsorption. 1. INTRODUCTION Currently, the excessive use of chemicals in agriculture has been the cause of contaminated water with fluoride, phosphate, ammonium. In the aqueous environment, the excess of phosphate cause extensive eutrophication, all kinds of algae, moss. Algae growth leads to massive changes to ecosystems and environmental conditions. Phosphate residues or excess in the body both are dangerous poison to the human body such as osteoporosis (because calcium can react with phosphate) and clogged blood vessels leading to stroke or heart attack leading or heart failure [1]. So, the .