How to develop an effective and cheap adsorbent for removing dyes completely from wastewaters and avoid disable adsorbent secondary pollution have great challenges for green dye and dyeing industrial production. In order to realize this aim, in this work, the porous cationic diatomite was prepared for the first time by covalently immobilizing poly-epichlorohydrin-dimethylamine onto natural diatomite, and its adsorption characteristics and sustainable utilization were investigated. The results indicated that the immobilizing reaction was found to happen both on the surface of diatomite and the inner wall of its pores. Cationic diatomite possessed a high removal efficiency to anionic dyes. The batch dye adsorption processes were endothermic and spontaneous, and better consistent with pseudo-second-order kinetic model and Freundlich isotherm model. The completely colorless effluent solution could be obtained when cationic diatomite was used as fixed-bed adsorbent, and its maximum dye adsorption capacities were more than 200 and 3 times larger than that of natural diatomite and commercial activated carbon, respectively. Most importantly, the disabled cationic diatomite could be used in colored coatings as pigment and filler simultaneously, thereby avoiding secondary pollution. In conclusion, this study can provide a green viable solution for controlling pollution in dye and dyeing industrial production.

如何开发一种有效，廉价的吸附剂，以完全去除废水中的染料，避免禁用吸附剂的二次污染，对绿色染料和印染工业生产提出了巨大的挑战。为了实现该目的，在本工作中，通过将聚表氯醇-二甲基胺共价固定在天然硅藻土上，首次制备了多孔阳离子硅藻土，并对其吸附特性和可持续利用进行了研究。结果表明，固定化反应在硅藻土的表面和孔的内壁均发生。阳离子硅藻土对阴离子染料具有很高的去除效率。间歇式染料的吸附过程是吸热的和自发的，与伪二级动力学模型和Freundlich等温线模型具有较好的一致性。当阳离子硅藻土用作固定床吸附剂时，可获得完全无色的出水溶液，其最大染料吸附量分别比天然硅藻土和市售活性炭大200倍和3倍。最重要的是，禁用的阳离子硅藻土可同时用作有色涂料中的颜料和填料，从而避免了二次污染。综上所述，本研究可为控制染整工业生产中的污染提供绿色可行的解决方案。禁用的阳离子硅藻土可同时用作有色涂料中的颜料和填料，从而避免了二次污染。综上所述，本研究可为控制染整工业生产中的污染提供绿色可行的解决方案。禁用的阳离子硅藻土可同时用作有色涂料中的颜料和填料，从而避免了二次污染。综上所述，本研究可为控制染整工业生产中的污染提供绿色可行的解决方案。