Preparation And Photocatakttic Activity Of Mutil-Composite Metal Oxides/Carbon Nanotubes

Semiconductor photocatalytic materials have attracted many attentions to the researchers for their photoelectric conversion,air purification, sterilization and deodorization, wastewater treatment and other unique features. The photoassisted catalytic decomposition of water and elimination of organic pollutants employing semiconductors as photocatalysts has been a environment-friendly technology due to its utilization of solar energy directly, which has been a promising application. However, most of photocatalytic system have low photocatalytic efficiencies because of the recombination of charge carrier, so, how to extend the photoresponse to the visible light region and enhance the photocatalytic efficiency have become the hotspot of research.In this paper, Zn-Al-In (Zn-Al-Fe and Mg-Al-In) multi-composite metal oxides and Zn-Al-In(Zn-Al-Fe and Mg-Al-In) multi-composite metal oxides/ carbon nanotubes visible light photocatalysis were respectively obtained from layered double hydroxid (LDHs) precursors and layered double hydroxid/ carbon nanotubes (LDHs/CNTs) composite precursors. The strueture and photocatalytic property of the visible light photocatalysis were studied by various characterization methods, major content of the thesis were detailed as follows:The ZnAlIn-CO3-LDHs and ZnAlIn-CO3-LDHs/CNTs were prepared respectively by using a new method involving separate nucleation-aging steps and conventional coprecipitation method.The ZnAlIn multi-composite metal oxides and ZnAlIn multi-composite metal oxides/CNTs visible-light photo catalysis were obtained by the calcination of precursors at certain temperature under N2. The differernt activity elements,the calcin ation temperature and the functionalized treatment of CNTs effected the structure and photocatalytic property of the calcined products by relevant characterization measures.This kind of visible light photocatalysis showed the higher catalytic properties in photodegradation of methyl blue, about 97%.The ZnAlFe multi-composite metal oxides and ZnAlFe multi-composite metal oxides/CNTs visible light photocatalysis were obtained by the calcination of ZnAlFe-CO3-LDHs and ZnAlFe-CO3-LDHs/CNTs precursors at definite temperature.This kind of visible light photocatalysis presents an increasing of photoresponse in the visible light region by altering the photocatalytic activity elements. Especially in the photo-reaction of photodegradating methyl blue, the higher photocatalytic activity of the calcined products at 500℃was presented when Al/Fe=1.The result shows that the photocatalytic activity elements and calcined temperature take a dominating effect in photocatalytic-reaction.The MgAlIn multi-composite metal oxides and MgAlIn multi-composite metal oxides/CNTs visible-light photocatalysis were obtained by the calcination of MgAlIn-CO3-LDHs and MgAlIn-CO3-LDHs/CNTs precursors at definite temperature. This kind of visible light photocatalysis presents an increasing of photoresponse in the visible light region and UV light region by altering the photocatalytic activity elements. Especially in the photo-reaction of photodegradating methyl orange and methyl blue, the higher photocatalytic activity of the calcined products at 500℃was presented,when Al/In=1.