为了发展高效、成本低的染料废水处理技术,促进农业废弃物核桃壳的资源化利用,本文采用静态吸附实验研究了核桃壳粉对水中染料的吸附动力学和热力学特征.结果表明:在pH 2~11条件下核桃壳粉粒子表面带负电荷,由于静电引力的作用核桃壳粉能有效吸附去除水中的阳离子染料.核桃壳粉吸附结晶紫的过程能很好地符合Langmuir方程,温度升高利于吸附的进行;D-R等温方程拟合结果表明该吸附是化学吸附;拟二级动力学方程能很好地拟合该吸附的动力学数据;该吸附发生了粒子内部扩散,但粒子内扩散并不是唯一的速率控制步骤;吸附热力学研究结果ΔG<0,ΔH>0,ΔS>0,表明该吸附是一个自发吸热过程,吸附后熵值变大,该吸附在高温下更容易进行.
In order to develop efficient and low-cost treatment technique for dye waste water and promote the resource utilization of walnut shell, the adsorption kinetic and thermodynamic characteristics of the walnut shell for dyes in water were studied by static adsorption experiments. The results showed that the walnut shell particles contained negatively charge under pH 2-11. The electrostatic attractive force between the cationic dyes and the adsorbent could result in high adsorption capacity of walnut shell to cationic dyes. The adsorption thermodynamic characteristics could be better described by the Langmuir model, and the maximal adsorption capacity increased with increasing the temperature.The results of D-R model showed the adsorption was a chemical process. The kinetic data was fitted well to pseudo second-order model. The adsoption was mainly controlled by intraparticle diffusion but that was not the only rate-controlling step. ΔG<0,ΔH>0 and ΔS>0 indicated that the adsorption system was spontaneous and endothermic,thus the adsorption processes were favorable at higher temperature.
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