Jain Rajeev, Sikarwar Shalini
Department of Environmental Chemistry, Jiwaji University, Gwalior, India.
J Hazard Mater. 2009 May 30;164(2-3):627-33. doi: 10.1016/j.jhazmat.2008.08.043. Epub 2008 Aug 22.
The present paper is aimed to investigate and develop cheap adsorption methods for colour removal from wastewater using waste material de-oiled mustard as adsorbent. De-oiled mustard, a biosorbent, was successfully utilized for removing a water-soluble xanthene dye, Erythrosine from wastewater. Kinetic studies of adsorption of Erythrosine at de-oiled mustard were carried out at 30 degrees C, using aqueous solutions with 5 x 10(-5)M concentration of Erythrosine. The adsorption process followed a pseudo-first order model. The equilibrium process can be well described by both Freundlich and Langmuir models, at 30, 40 and 50 degrees C. Free energy of adsorption (DeltaG degrees ), enthalpy (DeltaH degrees ), and entropy (DeltaS degrees ) changes were calculated to predict the nature of adsorption. The estimated values for DeltaG degrees were -12.81 x 10(3) and -12.57 x 10(3) over activated carbon and activated de-oiled mustard at 203 K (30 degrees C), indicate toward a spontaneous process. The positive value for DeltaH degrees indicates that the adsorption of Erythrosine dye to de-oiled mustard is an endothermic process.
本文旨在研究和开发使用废脱油芥菜作为吸附剂从废水中去除颜色的廉价吸附方法。脱油芥菜作为一种生物吸附剂，已成功用于从废水中去除水溶性呫吨染料赤藓红。在30℃下，使用浓度为5×10(-5)M的赤藓红水溶液对脱油芥菜吸附赤藓红进行了动力学研究。吸附过程遵循准一级模型。在30℃、40℃和50℃下，Freundlich模型和Langmuir模型都能很好地描述平衡过程。计算了吸附自由能（ΔG°）、焓（ΔH°）和熵（ΔS°）的变化，以预测吸附的性质。在203K（30℃）下，活性炭和活化脱油芥菜上的ΔG°估计值分别为-12.81×10(3)和-12.57×10(3)，表明该过程是自发的。ΔH°的正值表明赤藓红染料在脱油芥菜上的吸附是一个吸热过程。
