Synthesis of Mg/Al layered Double Hydroxide (LDH) Nanoplates for Efficient Removal of Nitarate from Aqueous Solutions

چکیده مقاله

Abstract With respect to nitrate loss from agricultural soils of temperate regions, nitrate leaching is an important phenomenon. Decomposition of plants and other organic residues in soil and improper disposal of wastewater and nitrogen fertilizers causes intered nitrate in surface water, groundwaters. Nano LDH-chloride was synthesized using hydrothermal technique and then characterized using scanning electron microscopy and EDS and nitrate removal from aquatic solutions by this mineral was evaluated at different pHs, times, rotation speeds, adsorbent concentrations and nitrate solution concentrations. Microscopic images of synthesized nanoplates were examined with electron microscopes EDS and SEM with two magnification. Results indicated that, dimensions of nanoplates were at nano scales so that the average thickness of nanoplates was 20 nanometers and their diameter was 250 nm. the higher magnification of the LDH indicated that the nano particles were flake- like shape. were Optimal conditions of adsorption: pH=7, 250 rpm: rotating speed, 45 min: time, and 0.1 g: adsorbent concentration. Nitrate adsorption on chloride-LDH was well explained with Longmuir model which is obvious from high values of R2. This material could adsorb nitrate from aquatic solutions efficiently.

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