改性麦草秸秆对活性艳红的吸附动力学研究

为实现农作物秸秆资源化,解决印染废水难处理问题,将麦草秸秆经过化学改性后制备成一种有效吸附染料的吸附剂,通过静态实验,研究了吸附剂对不同质量浓度、温度和振荡速度下对活性艳红的吸附动力学特性,并考察了在不同pH值、麦草投加量下,改性麦草秸秆对活性艳红吸附效果的影响。分别用伪一级动力学方程、伪二级动力学方程、Elovich方程和颗粒内扩散方程进行拟合。结果表明:改性麦草秸秆对活性艳红的吸附动力学过程可以用伪二级动力学模型进行很好地描述,颗粒内扩散模型表明,颗粒内扩散为主要速率控制步骤。吸附活化能为17.21kJ／mol,说明该吸附过程以物理吸附为主。

Kinetics of the adsorption of Reactive Brilliant Red K-2BP onto modified wheat residue

For removing the dye from wastewater, the wheat residue was modified into an anion exchanger. The adsorption kinetics of Reactive Brilliant Red K-2BP (RBR K-2BP) from aqueous solutions onto modified wheat residue(MWR)were studied in a batch reactor. Adsorption experiments were carried out as a function of pH and adsorbent dosage. In addition, the kinetic data were respectively fitted by pseudo-first-order equation, pseudo-second-order equation, Elovich equation and the intra particle diffusion model. It was found that the pseudo-second-order equation could provide the best correlation to the data. The intra-particle diffusion was the main rate-controlling step for the adsorption of RBR K-2BP onto MWR. The adsorption activation energy of dye was 17.21kJ／mol, which indicated that the adsorption type whole process was mainly of the physical adsorption.