Frantz Tuanny S, Silveira Nauro, Quadro Maurízio S, Andreazza Robson, Barcelos Amauri A, Cadaval Tito R S, Pinto Luiz A A
School of Chemistry and Food, Federal University of Rio Grande (FURG), FURG, km 8 Itália Avenue, Carreiros District, Rio Grande, RS, Brazil.
Engineering Department, Federal University of Pelotas (UFPel), Pelotas, RS, Brazil.
Environ Sci Pollut Res Int. 2017 Feb;24(6):5908-5917. doi: 10.1007/s11356-016-8344-z. Epub 2017 Jan 7.
Adsorption of copper ions onto chitosan films was studied, and the matrix effect was evaluated using a synthetic solution and a real effluent from closed copper mine. Chitosan films were prepared by casting technique and characterized. The adsorption study was carried out by equilibrium isotherms, thermodynamics, and kinetics. The thermodynamic parameters indicated that the copper adsorption onto chitosan film was favorable, spontaneous, and exothermic, suggesting an increased randomness at the solid/solution interface. The matrix effect was evaluated in kinetic assays, where a synthetic solution and a real system were carried out at different stirring rates. The highest values of adsorption capacity reached in all stirring rates were about 20% lower in the real effluent, and this reduction in the competitiveness was due to the presence of other ions in the matrix of the real effluent. The maximum adsorption capacity of copper ions onto chitosan films for the synthetic solution was of 450 mg g, and the removal percentage was in the range from 78 to 96%, and these values for the real effluent were of 360 mg g and removal ranging from 62 to 76%. The mapping done of ions present in the water adsorbed of the mine in the films showed that the same was homogeneously distributed in the films' surfaces.
研究了壳聚糖膜对铜离子的吸附作用，并使用合成溶液和封闭铜矿的实际废水评估了基质效应。通过流延技术制备壳聚糖膜并进行表征。吸附研究通过平衡等温线、热力学和动力学进行。热力学参数表明，壳聚糖膜对铜的吸附是有利的、自发的且放热的，这表明固/液界面处的随机性增加。在动力学试验中评估了基质效应，其中在不同搅拌速率下对合成溶液和实际系统进行了研究。在所有搅拌速率下，实际废水中达到的最高吸附容量值比合成溶液低约20%，这种竞争力的降低是由于实际废水中基质中存在其他离子。壳聚糖膜对合成溶液中铜离子的最大吸附容量为450 mg/g，去除率在78%至96%之间，实际废水的这些值为360 mg/g，去除率在62%至76%之间。对膜中吸附的矿井水中存在的离子进行的映射显示，这些离子在膜表面均匀分布。
