Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran.
Spectrochim Acta A Mol Biomol Spectrosc. 2012 Dec;99:102-9. doi: 10.1016/j.saa.2012.09.025. Epub 2012 Sep 16.
Adsorption of seven different organic dyes from aqueous solutions onto magnetite nanoparticles loaded tea waste (MNLTW) was studied. MNLTW was prepared via a simple method and was fully characterized. The properties of this magnetic adsorbent were characterized by scanning electron microscopy and X-ray diffraction. Adsorption characteristics of the MNLTW adsorbent was examined using Janus green, methylene blue, thionine, crystal violet, Congo red, neutral red and reactive blue 19 as adsorbates. Dyes adsorption process was thoroughly studied from both kinetic and equilibrium points of view for all adsorbents. The experimental isotherm data were analyzed using Langmuir, Freundlich, Sips, Redlich-Peterson, Brouers-Sotolongo and Temkin isotherms. The results from Langmuir isotherm indicated that the capacity of MNLTW for the adsorption of cationic dyes was higher than that for anionic dyes. The adsorption kinetics was tested for the pseudo-first order and pseudo-second order kinetic models at different experimental conditions.
研究了载磁铁矿纳米颗粒的茶废料（MNLTW）从水溶液中吸附七种不同的有机染料。MNLTW 通过一种简单的方法制备，并进行了充分的表征。通过扫描电子显微镜和 X 射线衍射对这种磁性吸附剂的性质进行了表征。使用詹纳斯绿、亚甲蓝、硫堇、结晶紫、刚果红、中性红和活性蓝 19 作为吸附物来研究 MNLTW 吸附剂的吸附特性。从动力学和平衡的角度对所有吸附剂的染料吸附过程进行了深入研究。使用 Langmuir、Freundlich、Sips、Redlich-Peterson、Brouers-Sotolongo 和 Temkin 等温线对实验等温线数据进行了分析。Langmuir 等温线的结果表明，MNLTW 对阳离子染料的吸附容量高于对阴离子染料的吸附容量。在不同的实验条件下，对假一级和假二级动力学模型进行了吸附动力学测试。
