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Formation of magnesium hydrosilicate nanomaterials and its applications for phosphate/ammonium removal
Rongtai Yu1,2,3, Feng Liu2, Hongqiang Ren1
1a State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment , Nanjing University , Nanjing , People's Republic of China.
Abstract:
Nanomaterials of magnesium hydrosilicate Mg3Si2O5(OH)4 were developed for phosphate and ammonium recovery from wastewater in virgin, which had the structure of diffuse interlamellar order, and synthesized under hydrothermal conditions at temperatures of 200°C for 36-72 h from mixtures of magnesite and zeolite as mineralizers. The amount of magnesium released has gone up to 48 mg/g by magnesium hydrosilicate, which was increased with the increase in the weight ratio of magnesite:zeolite. When magnesium hydrosilicate was used to adsorb phosphate and ammonium, electrostatic adsorption was not a dominant mechanism, the adsorbing capacity of phosphate was about 19 mg/g, and the simultaneous adsorbing capacity of ammonium was 7.8 mg/g.
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