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Nano-dimensional MnO2 were prepared in ethanol – water media from their inorganic salts by parallel redox reactions. The pH of solution, concentration of the salts and ethanol as well as reaction temperature were the key parameters for forming of nano-particles and anticoagulation. The MnO2 particles in colloidal solution then were coated on calcinated laterite grains to create new adsorption materials. | VNU Journal of Science Natural Sciences and Technology 24 2008 227-232 Preparation of nano-structural MnO2 in ethanol-water media coated on calcinated laterite and study of its arsenic adsorption capacity Dong Kim Loan1 Tran Hong Con1 Le Thu Thuy2 1College of Science VNU 334 Nguyen Trai Hanoi Vietnam 2 Hanoi College of Natural Resources and Environment Ministry of Natural Resources and Environment 41A K1 Cau Dien Hanoi Vietnam Received 15 August 2007 Abstract. Nano-dimensional MnO2 were prepared in ethanol - water media from their inorganic salts by parallel redox reactions. The pH of solution concentration of the salts and ethanol as well as reaction temperature were the key parameters for forming of nano-particles and anticoagulation. The MnO2 particles in colloidal solution then were coated on calcinated laterite grains to create new adsorption materials. The structure and surface of materials were studied by TEM and SEM methods. The arsenic adsorption ability of the material was investigated with imitative and real samples. In the optimum conditions maximum arsenic adsorption capacity reached the value of 139 g per kg. Created material was stable in water media and easy to regenerate when it was saturated adsorption by arsenic. 1. Introduction For the purpose of the creation of high performance adsorption material our investigation based onto two processes. The first was preparation of colloidal solution of nanostructure of metals oxides and the second was coating the prepared nano-particles on denaturated laterite surface. There are many chemical methods effectively used for nanomaterials preparation. Many authors prepared solid particles of Corresponding author. Tel. 84-4-8584995 E-mail dongkimloan@yahoo.co.uk transition metals hydroxide and oxides in nanodimensional scale by the way of hydrolyzing metal-organic compounds in water solution 1 2 or applying different physical effects during hydrolysis of metals ions 3 or using thermal and chemical .
