Abstract
In order to improve the treatment efficiency of printing and dyeing wastewater, the carbon nanotubes-silver-modified-titanium dioxide (CNTs-Ag-TiO2, CAT) ternary composite was prepared by a mechanical mixing method. It was found that the morphology of the prepared CAT sample was uniformly coated with strips of CNTs, speckled Ag, and lumpy TiO2. The (002) crystal plane of CNTs, the (101) crystal plane of TiO2, and the (111) crystal plane of Ag were observed, which possessed functional groups such as Ti-OH and Ti-O-C, indicating that the prepared CAT sample had photocatalytic reaction sites. The visible light utilization of titanium dioxide can be improved. The treatment effect of different proportions of CNTs-Ag-TiO2 on Congo red wastewater was tested, and the results showed that the optimum degradation effect of Congo red wastewater was CNTs: Ag = 10:1, and the doped amount of CNTs/Ag was 15%, and the removal rate of Congo red wastewater could reach 100% within 140 min. The excellent removal effect of CAT ternary composite on Congo red wastewater provided a new idea and way for the modification of TiO2 and its composites for the potential of organic dyes degradation.
Highlights
Printing and dyeing wastewater was one of the main sources of industrial wastewater, which discharge a large number of colored wastewater with various components
The treatment effect of different proportions of carbon nanotubes (CNTs)-AgTiO2 on Congo red wastewater was tested, and the results showed that the optimum degradation effect of Congo red wastewater was CNTs: Ag = 10:1, and the treated amount of CNTs/Ag was 15%, and the removal rate of Congo red wastewater could reach 100% within 140min
When the mass ratio was 20:1, the scanning electron microscopy (SEM) image of CA sample was shown in Fig 2a, and the amount of AgNPs coated on CNTs surface was less, that was, most CNTs surface has no AgNPs
Summary
Printing and dyeing wastewater was one of the main sources of industrial wastewater, which discharge a large number of colored wastewater with various components. Organic dyes, which produce printing and dyeing wastewater, had a wide range of uses in many industries, including textiles, leather, paper, printing, cosmetics and plastics(Wang et al 2019) Most of these dyes had the characteristics of stable structure, difficult degradation and high toxicity, which had brought serious problems to the environment(Eltaweil et al 2021). Chemical method had the advantages of rapid reaction and thorough degradation, but its cost was often higher, and other toxic byproducts might be produced in the chemical reaction, causing harm to the environment. These shortcomings limit their application in the treatment of printing and dyeing wastewater. We urgently need an environmentally friendly, economical and efficient purification method
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