Ayari F, Khelifi S, Trabelsi-Ayadi M
Laboratoire des Applications de la Chimie aux Ressources et Substances Naturelles et à l'Environnement (LACReSNE), Faculté de Sciences de Bizerte, Université de Carthage , Zarzouna , Tunisia.
Environ Technol. 2019 Sep;40(23):2986-3002. doi: 10.1080/09593330.2018.1461246. Epub 2018 Apr 18.
Clays have been considered as potential alternative adsorbents due to their high adsorptive property, abundance and non-toxic compounds. Adsorption of cationic dyes by natural clays has been studied and appreciable results have been reported, but few researchers have been interested in anionic dyes. Anionic dyes are widely used by the textile industries, yet they are toxic, non-biodegradable and hardly adsorbable on natural clay; modified clay (e.g. organoclay) has emerged as an alternative adsorbent. In this study, organobentonites were prepared with hexadecyltrimethylammonium bromide at three cation exchange capacity levels and used as adsorbents for the removal of, reactive blue II - an anionic dye used in Tunisian textile industry to dye jeans. Obtained organobentonite-labelled H-bent ( = 1, 2 and 3) was characterized by several techniques in order to study the effect of a surfactant on texture and structure of the initial clay. H-bent and purified bentonite (Na-bent) were then tested as adsorbents. The amount of dye removal by H-bent (98%) was found to be around five times higher than that of Na-bent (19%). Adsorption process was well described by Freundlich, Dubinin-Radushkevic and Elovich isotherms model. Kinetic data were fitted by both pseudo-second-order and pseudo-first-order models. The use of Na-bent, as adsorbent, for real textile effluent treatment was tested, and significant results related to two other clay minerals were obtained.
由于具有高吸附性、储量丰富且成分无毒，黏土被视为潜在的替代吸附剂。天然黏土对阳离子染料的吸附已有研究报道，且成果显著，但对阴离子染料感兴趣的研究者较少。阴离子染料在纺织工业中广泛使用，然而它们有毒、不可生物降解且在天然黏土上几乎无法吸附；改性黏土（如有机黏土）已成为一种替代吸附剂。在本研究中，用十六烷基三甲基溴化铵在三个阳离子交换容量水平下制备了有机膨润土，并将其用作吸附剂以去除活性蓝II——突尼斯纺织工业用于牛仔布染色的一种阴离子染料。对制得的标记为H-膨润土（=1、2和3）的有机膨润土采用多种技术进行表征，以研究表面活性剂对初始黏土质地和结构的影响。然后将H-膨润土和提纯膨润土（钠基膨润土）作为吸附剂进行测试。发现H-膨润土的染料去除量（98%）约为钠基膨润土（19%）的五倍。吸附过程可用弗伦德利希等温线、杜比宁-拉杜什克维奇等温线和埃洛维奇等温线模型很好地描述。动力学数据用伪二级模型和伪一级模型进行拟合。测试了将钠基膨润土用作吸附剂处理实际纺织废水的效果，并获得了与另外两种黏土矿物相关的显著结果。
