Gupta Vinod K, Mittal Alok, Kurup Lisha, Mittal Jyoti
Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667 (UA), India.
J Colloid Interface Sci. 2006 Dec 1;304(1):52-7. doi: 10.1016/j.jcis.2006.08.032. Epub 2006 Sep 20.
Erythrosine is a popular dye that is widely used in cosmetics, foodstuffs, medicines, and textiles. It is highly toxic to mankind and can lead to many diseases including carcinogenicity. Removal of erythrosine has been carried out using waste material--hen feathers--as adsorbent. The effects of pH, concentration of the dye, temperature, and adsorbent dosage have been studied. Adsorption of erythrosine over hen feathers has been correlated with Freundlich and Langmuir isotherms and satisfies both models. The adsorption process has been found endothermic in nature and thermodynamic parameters, Gibb's free energy (DeltaG(0)), change in enthalpy (DeltaH(0)), and change in entropy (DeltaS(0)) have been calculated. The paper also includes results on the kinetic measurements of adsorption of the dye on hen feathers at different temperatures. The adsorption follows a first-order kinetics at all the temperatures and values of the rate constant (k(ad)) have been calculated as 0.0179, 0.0177, and 0.0172 s(-1) at 30, 40, and 50 degrees C, respectively. By rate expression and treatment of data it has been ascertained that the adsorption of erythrosine over hen feathers follows a particle diffusion mechanism.
赤藓红是一种广泛应用于化妆品、食品、药品和纺织品的常用染料。它对人类具有高毒性，可导致包括致癌性在内的多种疾病。已使用废弃材料——鸡毛——作为吸附剂来去除赤藓红。研究了pH值、染料浓度、温度和吸附剂用量的影响。赤藓红在鸡毛上的吸附与弗伦德利希等温线和朗缪尔等温线相关，并且符合这两种模型。已发现吸附过程本质上是吸热的，并计算了热力学参数，吉布斯自由能（ΔG(0)）、焓变（ΔH(0)）和熵变（ΔS(0)）。该论文还包括了在不同温度下染料在鸡毛上吸附的动力学测量结果。在所有温度下，吸附均遵循一级动力学，在30、40和50℃时，速率常数（k(ad)）的值分别计算为0.0179、0.0177和0.0172 s(-1)。通过速率表达式和数据处理已确定，赤藓红在鸡毛上的吸附遵循颗粒扩散机制。
