Weng Chih-Huang, Lin Yao-Tung, Tzeng Tai-Wei
Department of Civil and Ecological Engineering, I-Shou University, Da-Hsu Township, Kaohsiung 84008, Taiwan.
J Hazard Mater. 2009 Oct 15;170(1):417-24. doi: 10.1016/j.jhazmat.2009.04.080. Epub 2009 May 4.
The ability of an unconventional bio-adsorbent, pineapple leaf powder (PLP) for the adsorption of methylene blue (MB) from aqueous solution was studied. It was observed that intra-particle diffusion was involved in the adsorption process and that the kinetic data fitted well with a pseudo-second-order equation. Fitting parameters revealed that the rate of adsorption increased with decrease in dye concentration and decrease in ionic strength while the mixing speed did not have a significant effect on adsorption. The adsorption was favorable at higher pH and lower temperature, and the equilibrium data were well fitted by the Langmuir isotherm. The maximum adsorption capacity varied from 4.68 x 10(-4) to 9.28 x 10(-4)mol/g when pH increases from 3.5 to 9.5. Thermodynamic parameters suggest that the adsorption is a typical physical process, spontaneous, and exothermic in nature. The results revealed that this agricultural waste has potential to be used as an economical adsorbent for the removal of methylene blue from aqueous solution.
研究了一种非常规生物吸附剂菠萝叶粉（PLP）从水溶液中吸附亚甲基蓝（MB）的能力。观察到颗粒内扩散参与了吸附过程，并且动力学数据与伪二级方程拟合良好。拟合参数表明，吸附速率随着染料浓度的降低和离子强度的降低而增加，而混合速度对吸附没有显著影响。在较高pH值和较低温度下吸附是有利的，平衡数据通过朗缪尔等温线拟合良好。当pH值从3.5增加到9.5时，最大吸附容量从4.68×10⁻⁴ 变化到9.28×10⁻⁴ mol/g。热力学参数表明吸附是一个典型的物理过程，本质上是自发的且放热的。结果表明，这种农业废弃物有潜力用作从水溶液中去除亚甲基蓝的经济吸附剂。
