The Morphology Control Of Several Photocatalysts And Their Catalytic Performance

In recent years, photocatalysis has been paid much attention for its potenicial contribution in the area of environment and energy. Preparation of the new materials with high photocatalytic activity has become one of research hot topics, which mainly focused on:(1) modification of the TiO2(commonly used photocatalyst) to improve its photocatalytic performance;(2) developing new semiconductor photocatalysts. The catalytic performance of photocatalysts strongly depends on their structure and morphology. Therefore, the rational synthesis of photocatalysts with certain structure and morphology is of great importance.Thus, in this work, we focused on investigation of the morphology control of photocatalytic materials using some cheap and non-toxic organic additives, and the consequent change in the photocatlaytic performance, which is of great significance for the practical production and application.Previous investigations have found that the (001) facets of anatase TiO2are of high photocatalytic activity, but now the control synthesis of the (001) facets requires the participation of fluorine, which brings a lot of pollution. Therefore, to explore the fluorine-free synthesis of anatase TiO2rich in (001) facets has important significance. In the second chapter of this thesis, anatase TiO2crystal with rich (001) facets were synthesized under fluorine-free conditions with the PDDA-C1as additive. The sample shows higher photocatalytic activity than conventional TiO2and commercial P25in the degradation of methyl orange.BiOX, as a new type of semiconductor material with a unique electronic structure, good optical properties and photocatalytic performance, has become a new research hot topic. Flake BiOI and BiOBr photocatalysts of different thickness were synthesized under hydrothermal conditions with the PHMB as additive shown in the third chapter. And the Cl-of PHMB could be involved in the synthesis of BiOI and BiOBr in the form of doping, which greatly increased the photodegradation ability. Molecular sieve has also become a research hotspot in the field of photocatalysis in recent years for their special structure and property.For example, ETS-10, one kind of titanosilicate, has attracted a great deal of interest, because of the unique pore structure and its titanium species, which can be inspired by the light. It has shown good activity in the photocatalysis especially in terms of photocatalytic shape-selective reactions of organic macromoleculars. In the fourth chapter, ETS-10with special morphology and abundant mesopores was successfully synthesized with the PDDA-C1as additive, which is of potential application in the shape-selective photocatalytic reactions.