Research On Design,Fabrication And Performance Of Novel Functional Materials Used For Photocatalysis

This thesis begins with the introduction of the basic concept and research progress of photocatalysis.The properties and applications?especially for photocatalysis?of newly discovered graphene materials,which received tremendous research interests,were systematically concluded.Besides,the basic concept of photonic crystal was given and also the utilization of photonic materials in photocatalysis was summarized.After that,several material systems based on graphene or polymer-inorganic composite were designed and fabricated.Their applications and performances in photocalysis domain were investigated.?i?At room temperature,?-FeOOH photocatalyst was loaded on reduced graphene oxide?rGO?sheets though the redox reaction between Fe?II?salt and graphene oxide.The result composite was successfully applied in the photocatalytic hydrogen generation reaction in water and gave 30?mol·g^-1 hydrogen yield.The pure FeOOH photocatalyst only gained trace amount of hydrogen under same conditions.Using methyl orange as mimetic aqueous azoic pollutant,the?-FeOOH@rGO catalyst also achieved good catalytic performance that degraded the pollutant and decolored the mimetic wastewater within 3 h.?ii?Through hydrothermal method,Cu₂MoS₄@rGO photocatalyst was fabricated conveniently.It shows much stronger absorbing ability of visible light than pure Cu₂MoS₄.The hydrogen generation amount was 5 times more than pure catalyst.?iii?To solve the problem of the relatively lower recyclability of graphene-based photocatalysts,CdS photocatalyst was loaded into chitosan,a natural macromolecule.After 10 rounds of catalytic reaction,the catalytic performance kept stable.?iv?Based on the fabrication technics of inverse opal photonic crystal,chitosan inverse-opal structure photonic crystal was built as carrier to improve the photocatalytic performance.The photonic structure improved 15%of the performance of CdS photocatalyst.?v?After changing the hydrogel material from chitosan to poly?acryl amide-co-acryl acid?,which is totally a transparent material to visible light,and making the photonic band structure match with the band structure of photocatalyst,the photocatalytic performance was obviously improved 30%.This system has good recyclability.Finally,this material also showed good propeties as catalyst carrier in sodium borohydride hydrolysis reaction for hydrogen production reaction.