Add time:09/07/2019         Source:sciencedirect.com

The hydrothermal synthesis of nano sized magnesium oxide materials in various shapes using different precursors have been explored in this work. Herein the organic base of hexamethylenetetramine (HMTA) was first time used as a hydrolysis base instead of usually used urea and the optimized conditions to form pure magnesium oxide nanowires with above 60% yield. This is obtained as a result of the reaction between magnesium acetate tetrahydrate and HMTA were at a weight ratio of 1:0.36 for 5 h at 180 °C in ethanol medium. Meanwhile the synthesis conditions to form very homogeneous magnesium oxide nano-flowers were also optimized with precursors of magnesium chloride hexahydrate and urea at a weight ratio of 1:0.6 in ethanol at 180 °C for 18 h. The adsorption capacity of MgO nanowires for removing arsenate [As(III)] and phosphate [PO43-] were evaluated and maximum adsorption capacities of As(III) and (PO43-) were 620 ± 6.2 mg/g and 962 ± 8.6 mg/g respectively. The highest adsorption of As(III) with magnesium oxide nanowires was obtained at pH 11.0, which is the similar pH value as MgO suspension in water. Therefor column or membranes using MgO nanowires can be a fantastic candidate for removing arsenate and phosphates from drinking water, which a major issue in many parts of the world. We also proposed an electrostatic based adsorption mechanism of arsenate and phosphate in detail.

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