十二烷基磺酸钠在赤铁矿表面吸附动力学

发布时间：2018-01-01 15:31

  本文关键词：十二烷基磺酸钠在赤铁矿表面吸附动力学　出处：《工程科学学报》2016年10期 　论文类型：期刊论文

  更多相关文章： 赤铁矿 浮选 十二烷基磺酸钠 吸附动力学 石英晶体微天平

【摘要】：利用带耗散功能的石英晶体微天平研究十二烷基磺酸钠在Fe_2O_3石英晶体谐振器表面的吸附动力学及吸附层构象.结果表明:十二烷基磺酸钠在赤铁矿表面的吸附是一个快速达到吸附平衡的过程,p H值对十二烷基磺酸钠的吸附影响较为明显,p H值在3~9的范围内,随着p H值增加,药剂吸附层黏弹性逐渐增大,吸附层稳定性减弱,赤铁矿回收率逐渐下降,十二烷基磺酸钠的吸附过程只有一个吸附阶段,且吸附过程符合准一级动力学模型,吸附层不发生明显构象变化;当p H值为10和11时,十二烷基磺酸钠吸附量明显增加,赤铁矿回收率也开始回升,吸附过程存在多个吸附阶段,吸附的第一阶段符合准二级动力学模型,吸附的第二阶段符合Elovich方程,并且随着吸附的进行,吸附层发生明显构象变化.
[Abstract]:The adsorption kinetics of sodium 12 alkyl sulfonate on the surface of Fe_2O_3 quartz crystal resonator and the conformation of adsorption layer were studied by using a quartz crystal microbalance with dissipation function. The adsorption of sodium 12 alkyl sulfonate on hematite surface is a rapid process to achieve adsorption equilibrium. The influence of pH value on the adsorption of sodium 12 alkyl sulfonate is obvious in the range of 3 ~ 9. With the increase of pH value, the viscoelasticity of the adsorption layer increases and the stability of the adsorption layer weakens. The recovery rate of hematite decreased gradually, and the adsorption process of sodium 12 alkyl sulfonate was only one stage, and the adsorption process was in accordance with the quasi-first-order kinetic model, and the adsorption layer had no obvious conformation change. When pH values were 10 and 11:00, the adsorption capacity of sodium 12 alkyl sulfonate was obviously increased, and the recovery rate of hematite began to rise, and there were several adsorption stages in the adsorption process. The first stage of adsorption accords with the quasi-second-order kinetic model, and the second stage of adsorption conforms to the Elovich equation.
【作者单位】： 北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金青年科学基金资助项目(51204012)
【分类号】：TD923
【正文快照】： 浮选是目前分选回收赤铁矿的主要方法.赤铁矿浮选主要采用阳离子捕收剂反浮选石英、阴离子捕收剂正浮选铁矿物、阴离子捕收剂反浮选活化后的石英等流程[1].在正浮选工艺中,十二烷基磺酸钠(sodiumdodecyl sulfonate,SDS)是应用较多的一类阴离子型捕收剂.目前关于十二烷基磺酸钠，

本文编号：1365110