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采用批量平衡法,研究了二氯喹啉酸在蒙脱石、凹凸棒石和针铁矿3种矿物中的吸附-解吸特征,并从吸附热力学角度探讨了矿物的吸附机理,结果表明,二氯喹啉酸在供试矿物中的吸附均包含了快速反应阶段和慢速平衡阶段,其吸附动力学曲线均符合准二级动力学方程、颗粒扩散方程和Elovich方程。其中以准二级动力学方程的拟合程度最好,在颗粒扩散方程中的常数项(C值)不为0,表明颗粒内的扩散速率不是决定二氯喹啉酸在供试矿物中吸附快慢的唯一因素。二氯喹啉酸在3种矿物中的吸附/解吸等温线均能用Linear和Freundlich方程很好地拟合,二氯喹啉酸在供试矿物中的吸附容量大小为:针铁矿>蒙脱石>凹凸棒石。二氯喹啉酸在供试矿物中的解吸过程中存在明显的滞后现象,二氯喹啉酸在供试矿物中的吸附具有高度自发性,温度越高吸附过程自发趋势越大。
The adsorption-desorption characteristics of quinclorac in three minerals of montmorillonite, attapulgite and goethite were studied by batch equilibrium method. The adsorption mechanism of mineral was also discussed from the perspective of adsorption thermodynamics. The results showed that the adsorption of quinclorac The adsorption of acid in the test minerals both contained the rapid reaction stage and the slow equilibrium stage. The adsorption kinetic curves were in accordance with quasi-second-order kinetic equation, particle diffusion equation and Elovich equation. The quasi-second-order kinetic equation is best fit, and the constant term (C value) in the particle diffusion equation is not 0, indicating that the intraparticle diffusion rate is not the decisive factor for quinclorac in the test minerals The only factor The adsorption / desorption isotherms of quinclorac in the three minerals are well fitted by the Linear and Freundlich equations. The adsorption capacities of quinclorac in the test minerals are: goethite> montmorillonite > Attapulgite. Quinclorac in the test minerals desorption process there is a significant lag phenomenon, quinclorac in the test mineral adsorption is highly spontaneous, the higher the temperature the greater the spontaneous tendency of the adsorption process.