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

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.