With an increased use of color dye in textile industries and elevated fabrics output, more scientific studies and technology developments are needed to effectively treat wastewater containing dyes. However, better understanding of the interactions between dyes and suspended solids is a necessity to advance such developments. In this study the interactions between rhodamine 6G (R6G), a cationic dye, and different types of clays minerals, commonly found in the wastewater sludge, were elucidated. The uptake of R6G on the clay minerals was attributed to cation exchange on the external surfaces of non-swelling clays, and at both external and interlayer spaces for swelling clays. In the interlayer of montmorillonite, the R6G molecules form monolayer and bilayer configurations under low and high uptake levels. The significant amounts of R6G uptake indicate that clay minerals are good sorbents for the removal of cationic dyes from water. And the R6G could be readily removed in wastewater treatment by adding small amount of clays and flocculated the clays out.

随着纺织工业中彩色染料使用的增加和织物产量的增加，需要更多的科学研究和技术开发来有效地处理含染料的废水。但是，对染料与悬浮固体之间相互作用的更好理解是推进这种发展的必要条件。在这项研究中，阐明了若丹明6G（R6G），一种阳离子染料与通常在废水污泥中发现的不同类型的粘土矿物之间的相互作用。粘土矿物中R6G的吸收归因于非膨胀粘土外表面以及溶胀粘土的外层和层间空间的阳离子交换。在蒙脱土的夹层中，R6G分子在低和高吸收水平下形成单层和双层构型。大量的R6G吸收表明粘土矿物是从水中去除阳离子染料的良好吸附剂。通过添加少量粘土并将粘土絮凝出来，可以很容易地将R6G用于废水处理。