澳洲坚果壳吸附3种阳离子染料的研究

以坚果壳为原料, 经粉碎制成不同粒径的粉末吸附剂。探究了坚果壳吸附亚甲基蓝、罗丹明B、碱性品红的性能。研究发现坚果壳吸附亚甲基蓝、罗丹明B、碱性品红最佳粒径为0.3 mm、最佳投加量分别为1.6、2.4、1.2 g,pH均为5、温度为30 ℃、震荡时间为30、60、60 min。利用准一级、准二级动力学方程模拟坚果壳吸附亚甲基蓝、罗丹明B和碱性品红的动力学过程,结果表明坚果壳吸附亚甲基蓝、罗丹明B和碱性品红的过程适合于准二级动力,学模型。文中计算了焓变（ΔH ⁰）、自由能（ΔG ⁰）、熵变（ΔS ⁰）等热力学参数,坚果壳吸附3种阳离子染料过程中ΔG ⁰均小于0,ΔS ⁰、ΔH ⁰均大于0,说明坚果壳吸附3种阳离子染料的过程是一个自发的趋于无序的吸热过程。

Adsorption of CatioIlic Dye in Aqueous Solution of Macadamia Nut Shell

The powder of macadamia nut shell at different particle sizes was prepared as the adsorbent. The adsorption properties of macadamia nut shell powder for methylene blue, rhodamine B and basic fuchsine were studied at different conditions. The optimal adsorption conditions were as follows: the dosage of macadamia nut shell powder at 1.6, 2.4 and 1.2 g, pH value at 5, particle size at 0.3 mm, adsorption time at 30, 60, 60 min and temperature at 30 ℃. The pseudo-first-order, pseudo-second-order were used to simulate the kinetic process of it. The pseudo-second kinetic equation was more suitable for describing the process of it. The thermodynamic parameters of Gibbs free energy(ΔG ⁰), enthalpy (ΔH ⁰) and entropy change(ΔS ⁰) were calculated. In the process of macadamia nut shell powder adsorption of methylene blue, rhodamine B and basic fuchsine, the value of ΔG ⁰, ΔS ⁰, and ΔH ⁰was ΔG ⁰<0, ΔH ⁰>0 and ΔS ⁰>0, indicating that it was a spontaneous, disorderly and endothermic process.