氯离子柱撑水滑石共沉淀法合成反应动力学

根据氯离子型层状复合氢氧化物(LDH-Cl)制备过程中溶液浓度变化的监测结果和不同反应进程时产物的EDS、IR、XRD、TEM、TG-DTA表征结果,研究了合成LDH-Cl的共沉淀反应动力学特征及机理.实验结果表明, LDH-Cl的生成符合多核层表面反应动力学模型;反应过程中LDH的晶胞参数c从2.421 nm变为2.399 nm,通道高度h由0.3321 nm减小为0.3228 nm,粒子直径Da由6.40 nm增大为15.16 nm, Dc由7.43 nm增大到10.93 nm,纵横比由0.86增大为1.39; IR和TG-DTA特征变化表明了层板对阴离子作用的强度和层板的结构稳定性随反应进程而提高.

Kinetics of Synthetic of Cl- Type Hydrotalcitelike with Coprecipitation Reaction

The dynamics feature and mechanism of preparation of layered double hydroxides pillared by Cl-anion(LDH Cl) with coprecipitation reaction had been investigated, based on the result of monitoring concentrations during reaction course, and on the result of EDS, IR, XRD, TEM and TG DTA characterization for samples produced from different reaction course. The results testified that the generating of LDH Cl was controlled by polynuclcar layer surface reaction mechanism. It was also found that the lattice parameter c decreased from 2.421 nm to 2.399 nm, and h from 0.3321 nm to 0.3228 nm, with grain size increasing of Da from 6.40 nm to 15.16 nm, Dc from 7.43 nm to 10.93 nm, and increasing of aspect ratio from 0.86 to 1.39 during the whole reaction course, in addition, the strength of interaction between sheet and anions and the structure stability of sheet enhancing with reaction course as showed by IR and TG DTA characterization.