Scavenging of Nitrate ions in Sandy Soil Using Mg/Al layered double hydroxide Nano plates for Reducing Leaching

چکیده مقاله

Applying chemical fertilizers such as nitrogen fertilizers, leads to enhancing nitrate concentration over acceptable limit in water sources and their pollution. With respect to health, environmental and economical fields, nitrate leaching is an important issue. The purpose of this research was to synthesize and characterize Mg-Al-LDH chloride nano plates and their application for reducing nitrate leaching from soil in saturated condition. Mg-Al-LDH was synthesized hydrothermally and then characterized using XRD, TEM, SEM, Fe SEM. Microscopic images of synthesized nano plates using electron microscopes SEM Feand SEM indicated that the dimensions of nano plates was at nanometer scale, so that their mean diameter was about 20 nm. High magnification of LDH is representative of its flakey shape. XRD pattern shows LDH with sharp and asymmetric reflections. In order to study the ability of LDH to adsorb and retain nitrate ion in laboratory condition and in saturated soil, an experiment with four treatments were designed; one of them was related to control (without LDH) and other three treatments had 2, 4, 8 g LDH/kg soil, respectively. This research was performed in triplicates using complete randomized block design. Applying 2, 4, 8 g LDH per kg soil leads to 43.92, 63.27, and 80.06 percent reduction in nitrate leaching, respectively. Applying 2, 4, 8 g LDH per kg soil causes 17.79, 38.13, and 44.56 percent reduction in average velocity of water in soil. It is proposed to study the effects of LDHs on nitrate leaching in clayey soils and loamy soils. It is also suggested to use LDH for removing other anions such as carbonates and phosphates from soil and study their efficiency

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