中文摘要：

对合成的Mg2Al型层状双金属氢氧化物（LDH）及其煅烧产物（CLDH）进行了表征．研究了对硝基苯酚在LDH和CLDH上的吸附．结果表明，对硝基苯酚在LDH和CLDH上均可发生吸附，其吸附等温线均符合Freundlich等温式；在LDH上的吸附动力学符合双常数方程，而在CLDH上的吸附动力学符合准一级动力学速率方程和Elovich方程；在CLDH上的吸附速率和吸附量明显高于LDH．初始pH在3～10范围内变化对吸附量的影响不大，但有先增大后降低的趋势，温度升高，吸附量增大．讨论了吸附机理．研究结果表明，CLDH有望成为一种新型的高效酚类有机污染物处理剂．

英文摘要：

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-nitro- phenol 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.