Farinella N V, Matos G D, Arruda M A Z
Universidade Estadual de Campinas, Institute of Chemistry, Department of Analytical Chemistry, P.O. Box 6154, 13084-862 Campinas, SP, Brazil.
Bioresour Technol. 2007 Jul;98(10):1940-6. doi: 10.1016/j.biortech.2006.07.043. Epub 2006 Oct 16.
Grape bagasse generated in the wine production process was characterized through X-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy, nuclear magnetic resonance and thermogravimetric analysis. The efficiency of this natural material for Cd(II) and Pb(II) adsorption was evaluated using a batch adsorption technique. Factors affecting metal adsorption such as pH and contact time were investigated. Maximum adsorption was found to occur at pH 7.0 and 3.0 for Cd(II) and Pb(II), respectively, and a contact time of 5min was required to reach equilibrium for both metals. With these conditions, adsorption studies were performed using a single solution. In addition, to calculate the adsorption capacities for each metal, the Langmüir isotherm model was used. The adsorption capacities were found to be 0.479 and 0.204mmolg(-1) for Cd(II) and Pb(II), respectively. The results showed that grape bagasse could be employed as a low-cost alternative adsorbent for effluent treatment.
通过X射线衍射、傅里叶变换红外光谱、扫描电子显微镜、核磁共振和热重分析对葡萄酒生产过程中产生的葡萄渣进行了表征。采用分批吸附技术评估了这种天然材料对Cd(II)和Pb(II)的吸附效率。研究了影响金属吸附的因素，如pH值和接触时间。发现Cd(II)和Pb(II)的最大吸附分别发生在pH值为7.0和3.0时，两种金属达到平衡均需要5分钟的接触时间。在这些条件下，使用单一溶液进行了吸附研究。此外，为了计算每种金属的吸附容量，使用了朗缪尔等温线模型。发现Cd(II)和Pb(II)的吸附容量分别为0.479和0.204 mmol g(-1)。结果表明，葡萄渣可作为一种低成本的替代吸附剂用于废水处理。
