Studies On Fabrication Of Free-standing And Flexible Composite For Organic Dye Removal

The printing and dyeing industry discharging a large amount of organic dye wastewater has already become one of the main causes of water pollution in China.Fenton-like catalysts and adsorbents have been widely applied to address this problem due to high efficiency and simple water treatment process.Nevertheless,there are still disadvantages of current-developed powdery Fenton-like catalysts or adsorbents,e.g.difficult recycling,causing secondary pollution to water.In this dissertation,the preparation technics of the two flexible and free-standing composites with core-shell structure were studied.The catalytic and self-cleaning adsorption performance were tested and the reaction mechanism was also explored.This dissertation provides a new idea for the development of new organic dye wastewater treatment materials with easy recycling,high efficiency and great reusability.The V₂O₅ film was prepared on the stainless steel substrate by electrophoretic deposition method,and the flexible and free-standing Fe@VO₂ composite with core-shell structure was obtained by the following heat treatment process.VO₂,serving as a novel Fenton-like catalyst,was able to degrade organic dyes effectively.99.8%of RhB was removed successfully within 140 min.The Fe@VO₂ composite not only possessed excellent flexibility and free-standing property,but also realized easy recycling.In addition,it achieved high degradation efficiency toward organic dyes in a reaction environment with wide pH range from 3.0-10.4,thereby reducing the cost of use.By combining electrochemical deposition and low temperature iodination,the CuI@CC composite with core-shell structure was fabricated successfully.The shell of?-CuI could quickly treat organic dye wastewater by filtering adsorption.100%of RhB was removed with 30 s and the adsorption capacity of the composite reached 2642 mg/m².The flexibility and free-standing characteristics solved the problems of difficult recycling of traditional adsorbents.Moreover,the self-cleaning property of the composite enabled it to degrade the adsorbed RhB after 4 h of ultraviolet irradiation,improving the recycling property of the composite.