Adsorption of arsenic (V) and phosphate onto MgAlNO3-LDHs

Abstract

LDH with nitrate in the interlayer and Mg-Al (3:1) in the layer have been synthesized by co-precipitation method. The adsorption of arsenic and phosphate onto MgAlNO3 hydrotalcite was evaluated with respect to pH, contact time, initial concentration and adsorbent dosage. The kinetic data were fitted into the pseudo-first-order equation, and the pseudo-second-order equations, and the intra-particle diffusion model. The results indicate that the pseudo-second-order model generates the best agreement with the experimental data for both arsenic and phosphate suggesting that the adsorption process might involve chemical sorption.