Abstract: The synthesized Mg2Al layered double hydroxide (LDH) and its calcined product (CLDH) were characterized. The sorption removal of p-nitrophenol from solution by LDH and CLDH were investigated. The results show that p-nitrophenol can be adsorbed on both LDH and CLDH, adsorption isotherms can be fitted with the Freundlich equation, and the sorption kinetics of p-nitrophenol on LDH can be well described by the two-constant equation while the sorption kinetics of p-nitrophenol on CLDH can be well described by pseudo-first-order kinetics and the Elovich equation. The sorption rate and sorption amount of p-nitrophenol on the CLDH is higher than that on the LDH at the same equilibrium p-nitrophenol concentration. In the initial pH range of 3～10, the sorption amount displayed the tendency of an initial increase and then a decrease with the initial pH increasing. With an increase of temperature, the sorption amount increases with increasing temperature. The sorption mechanism of p-nitrophenol on the LDH and the CLDH was discussed. The CLDH will be a new kind of highly effective adsorbent for phenols pollution.

Key words: structure reconstruction , adsorption, p-nitrophenol, layered double hydroxide