Ferrarini F, Bonetto L R, Crespo Janaina S, Giovanela M
Centro de Ciências Exatas e da Tecnologia, Universidade de Caxias do Sul, Caxias do Sul, RS 95070-560, Brazil E-mail:
Water Sci Technol. 2016;73(9):2132-42. doi: 10.2166/wst.2016.060.
Adsorption has been considered as one of the most effective methods to remove dyes from aqueous solutions due to its ease of operation, high efficiency and wide adaptability. In view of all these aspects, this study aimed to evaluate the adsorption capacity of a halloysite-magnetite-based composite in the removal of Congo red dye from aqueous solutions. The effects of stirring rate, pH, initial dye concentration and contact time were investigated. The results revealed that the adsorption kinetics followed the pseudo-second-order model, and equilibrium was well represented by the Brunauer-Emmett-Teller isotherm. The thermodynamic data showed that dye adsorption onto the composite was spontaneous and endothermic and occurred by physisorption. Finally, the composite could also be regenerated at least four times by calcination and was shown to be a promising adsorbent for the removal of this dye.
由于操作简便、效率高且适应性广，吸附被认为是从水溶液中去除染料最有效的方法之一。鉴于所有这些方面，本研究旨在评估基于埃洛石 - 磁铁矿的复合材料对水溶液中刚果红染料的吸附能力。研究了搅拌速率、pH值、初始染料浓度和接触时间的影响。结果表明，吸附动力学遵循准二级模型，平衡由布鲁诺尔 - 埃米特 - 特勒等温线很好地描述。热力学数据表明，染料在复合材料上的吸附是自发的且吸热的，并且是通过物理吸附发生的。最后，该复合材料通过煅烧至少可以再生四次，并且被证明是一种有前途的去除这种染料的吸附剂。
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