Department of Environmental Science and Engineering, Ewha Womans University, Daehyundong 11-1, Seodaemungu, Seoul 120-750, Republic of Korea.
J Hazard Mater. 2010 Apr 15;176(1-3):820-8. doi: 10.1016/j.jhazmat.2009.11.110. Epub 2009 Nov 27.
This study reports on the feasibility of employing degreased coffee beans (DCB) as adsorbent for Malachite Green (MG) removal in dyeing wastewater. The iodine value (IV), specific surface area (SSA) and porosity of the raw coffee beans (RCB) used in the study increased after the degreasing process, resulting in significant increase in the adsorption of MG onto DCB. Employing a batch experimental set-up, optimum conditions for complete color removal and adsorption of MG by DCB was studied considering parameters such as effect of degreasing process, adsorbent dosage, initial dye concentration, reaction temperature and pH. Adsorbed amount of MG by DCB increased with increasing DCB dosage and initial MG concentration. The rate of the adsorption reaction followed the pseudo second-order kinetics with the sorption isotherm well fitted to the Freundlich and the Langmuir isotherm models. Thermodynamic studies revealed that the adsorption processes is spontaneous and endothermic in nature. DCB has potentials for application as adsorbent for the removal of MG from dyeing process wastewater.
本研究报告了使用脱油咖啡豆（DCB）作为吸附剂去除染色废水中孔雀石绿（MG）的可行性。研究中使用的生咖啡豆（RCB）经过脱油处理后，碘值（IV）、比表面积（SSA）和孔隙率增加，从而导致 MG 在 DCB 上的吸附显著增加。通过批实验装置，研究了考虑脱油过程、吸附剂用量、初始染料浓度、反应温度和 pH 等参数对 DCB 完全去除和吸附 MG 的最佳条件。随着 DCB 用量和初始 MG 浓度的增加，DCB 对 MG 的吸附量增加。吸附反应速率符合准二级动力学模型，吸附等温线很好地符合 Freundlich 和 Langmuir 等温模型。热力学研究表明，吸附过程是自发的和吸热的。DCB 具有作为吸附剂从染色工艺废水中去除 MG 的应用潜力。
