Preparation Of Nanocarbon/TiO₂ Composite Photocatalyst And Its Application In Dyeing Wastewater Treatment

With the rapid development of industrialization and urbanization, printing and dyeing industry develops quickly. As a result, more and more printing and dyeing wastewater is poured into the river everyday. Massive emissions of pollutants has seriously affected people’s living environment, and has been a threat to human health. With the current situation of energy shortage,photocatalysis technology is considered to be the most promising method to treat pollutants,because which owns the ability of direct conversion of solar into chemical energy to degrade pollutants.As the traditional photocatalysis, TiO₂ is low toxicity, low-cost, good stability. However TiO₂ is not suitable for large-scale practical application due to its limited visible-light absorption and low quantum efficiency. The introduction of Nano-carbon materials is a very feasible way which not only can improve absorption of visible light,but also can enhance the adsorption property to the degradation products.Thus, this paper was conducted from the Nanocarbon/TiO₂ photocatalysts, and the main research results as follow:（1）The TiO₂-C₆₀ composite materials were prepared by a simple precipitation method and characterized by X-ray diffraction（XRD）, Transmission electron microscope（TEM） and UV-vis diffraction reflection spectroscopy（DRS）. The TiO₂-C₆₀ composite materials showed an efficient photocatalytic degradation of RhB under the visible light compared with TiO₂. In addition, the TiO₂-C₆₀ exhibited excellent stability and reproducibility under the repeat degradation tests.（2）The TiO₂-rGO composite materials were prepared by a simple precipitation method and characterized by X-ray diffraction（XRD）, Transmission electron microscope（TEM） and UV-vis diffraction reflection spectroscopy（DRS）. The TiO₂-rGO composite materials showed an efficient photocatalytic degradation of RhB under the visible light compared with TiO₂. In addition, the TiO₂-rGO also exhibited excellent stability and reproducibility under the repeat degradation tests.（3） To further explore the adsorption capacity and degradation efficiency of two catalysts, we selected several common types of dyes as degradation objects, The results showed that two catalysts both exhibited excellent adsorption capacity and degradation efficiency almost to all types of dyes, Compared with TiO₂-rGO, TiO₂-C₆₀ had better adsorption capacity and degradation efficiency,but taking into account the cost, we finally chose TiO₂-rGO as ideal industrial catalyst. Under the sunlight, the TiO₂-rGO composite materials showed an efficient photocatalytic degradation of printing and dyeing wastewater.