苯环对胲铵类捕收剂在钛铁矿表面吸附动力学的影响

以N-亚硝基苯胲铵和N-亚硝基萘胲铵在钛铁矿表面的吸附动力学特性为研究对象,系统考察了pH、搅拌时间对吸附行为的影响。结果表明,N-亚硝基萘胲铵在钛铁矿表面的最大吸附量及吸附速率均大于N-亚硝基苯胲铵；吸附动力学拟合结果表明准一级动力学方程能很好的描述两种药剂的吸附行为。扩散模型拟合结果表明不同pH值下两种药剂吸附过程的控制性步骤均表现为钛铁矿表面活性质点离子在表膜中的扩散。量子化学及立体化学分析结果表明N-亚硝基萘胲铵分子结构中的苯环具有吸电子诱导效应,不仅会影响键合原子的电子云密度还会对官能团的相对位置产生较大影响,进而对N-亚硝基苯胲铵和N-亚硝基萘胲铵的吸附动力学和吸附量产生影响。

Influences of Benzene Ring on Adsorption Kinetics of Collectors onto Ilmenite

The adsorption characteristics of cupferron and neocupferron onto ilmenite were taken as the research subject and the effects of pH and temperature on the adsorption were studied systematically. The results showed that the maximum adsorption and the adsorption ratio of neocupferron on rutile was higher than that of cupferron. Adsorption kinetics indicated that the experiment data followed the pseudo-first order kinetic equation well for both reagents. Diffusion model studies manifested that the diffusion of activity sites in mineral surface film was the rate-limited step for these two reagents at various pH values. Results of the quantum chemistry and stereochemistry demonstrated that the benzene ring in neocupferron which possessed the electron-withdrawing inductive effect, can not only affect the electron cloud density of the bonding atoms but also the relative position of the functional group, and finally leaded to the different performances of cupferron and neocupferron on their adsorption capacity and kinetics.