Characterization and application of tourmaline and beryl from Brazilian pegmatite in adsorption process with divalent metals

• Published in: International journal of mining science and technology 2012-09, Vol.22 (5), p.711-718
• Main Authors: Guerra, Denis L., Oliveira, Silze P., Silva, Ricardo A.R., Leidens, Victor, Batista, Adriano C.
• Format: Article
• Language: English
• Subjects: Environmental; Industrial minerals; Pollution; Surface modification; Wasteprocesing; 二价金属; 伟晶岩; 傅立叶变换红外光谱仪; 吸附过程; 巴西; 电气石; 绿柱石; 表征
• ISSN: 2095-2686
• DOI: 10.1016/j.ijmst.2012.08.021

In this study,the original tourmaline and beryl mineral samples have been collected from a Brazilian pegmatite.The objective of this study was to examine the adsorption behavior of Brazilian ciclosilicate samples,towards divalent metals（Pb 2＋,Mn 2＋,and Zn 2＋） in ethanol solution has been studies by a batch technique.The ciclosilicate samples were characterized by elemental analysis,Fourier transform infrared spectroscopy,helium picnometry,mercury porosity,and nitrogen adsorption-desorption.The Langmuir expression for adsorption isotherm was applied in order to determine the adsorption capacity to form a monolayer and the constant related to the adsorption intensity.In aqueous solution there was a significant adsorption increase with the temperature and pronounced synergistic effects were observed.The maximum number of moles adsorbed was determined to be 12.48 and 11.49 mmol/g for systems Pb 2＋ /beryl and Pb 2＋ /tourmaline,respectively.The energetic effects caused by metal cations adsorption were determined through calorimetric titrations.Thermodynamics indicated the existence of favorable conditions for such Pb 2＋-,Mn 2＋-,and Zn 2＋-OH interactions.