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Study on Preparation and Photocatalytic Performance of Sulfide Composite Material

Author: ZhangXiaoPei
Tutor: HuangZuo
School: Huaqiao University
Course: Chemical Engineering
Keywords: Sulfide Photocatalysis Hydrogen Composite photocatalyst Layered-compounds
CLC: TQ426
Type: Master's thesis
Year: 2013
Downloads: 1
Quote: 0
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Abstract


The energy supply is the top problem that mankind will face within the next50years. Photocatalytic splitting of water into H2by semiconductors with solar lightirradiation is one of the most promising ways for converting solar energy intochemical energy. Sulfide has been considered as one of the most efficientphotocatalysts for hydrogen evolution from aqueous solutions, due to its relativelynarrow band gap and its conduction band edge more negative than the H2O/H2redoxpotential. However, this type of catalytic materials are mostly poor stability, it isprone to light corrosion under light irradiation. Therefore, it is expected that thephotocatalytic activity of the photocatlysts can be enhanced further, and thephotocorrosion can be restrained. In the present study, choosing an semiconductorHSr2TaNb2O10and HCa2TaNb2O10with a layered structure as host, ZnS and PbS asguest, a novel layered intercalated material without using any co-catalyst such asnoble metal platinum was prepared, and the photocatalytic activities of samples wereevaluated by a conventional method in an aqueous solution containing SO32-and S2-as a sacrificial agent. Finally, with the method of traditional preparation and the helpof microwave, we prepared HCa2TaNb2O10/(Zn2/3Pb1/3S), and study its photocatalyticactivity. Then relationship between component, configuration and performance of theas-samples were characterized by scanning electmicroscopy （SEM）,Energy-dispersive X-ray spectroscopy （EDX）, X-ray diffraction （XRD）, ultraviolet-visible spectroscopy （UV-vis）, etc.. The reaction mechanism model andphotocatalyltic was studied. The dissertation was mainly discussed as follows:1. The stability of CdS was improved by intercalating the CdS particles into theinterlayer of HSr2TaNb2O10. The photocatalytic activitie and stability ofHSr2TaNb2O10/CdS nanocomposite was superior to that of unsupported CdS. Withuse of HSr2TaNb2O10/CdS and unsupported CdS as a catalyst, respectively, thephotocatalytic hydrogen evolution was more than10.72and7.42mmol/g in thepresence of SO32-and S2-as a sacrificial agent under irradiation with λ>290nm froma100-W mercury lamp for8eight hours. 2. An intercalated nanomaterial HCa2Nb3O10/PbS was fabricated by successiveintercalated the PbS particles into the interlayer of HCa2Nb3O10. With use ofHCa2Nb3O10/PbS as a catalyst, respectively, the photocatalytic hydrogen evolutionwas more than4.34mmol/g in the presence of SO32-and S2-as a sacrificial agentunder irradiation with λ>290nm from a100-W mercury lamp for3hours. Allsamples showed photocatalytic activity to evolve hydrogen gas. The amount ofhydrogen gas produced decreased in the sequence, HCa2Nb3O10/PbS> HCa2Nb3O10>KCa2Nb3O10> PbS.3. An intercalated nanomaterial HCa2TaNb2O10/(Cd0.8Pb0.2S) was fabricated bysuccessive co-intercalated the CdS and PbS particles into the interlayer ofHCa2TaNb2O10. With use of HCa2TaNb2O10/(Cd0.8Pb0.2S) as a catalyst, respectively,the photocatalytic hydrogen evolution rate was more than2.97mmol/g·h in thepresence of SO32-and S2-as a sacrificial agent under irradiation with λ>290nm froma100-W mercury lamp. The amount of hydrogen gas produced decreased in thesequence, HCa2TaNb2O10/(Cd0.8Pb0.2S)> HCa2TaNb2O10/CdS> HCa2TaNb2O10/PbS>HCa2TaNb2O10> KCa2TaNb2O10.4. A visible light driven heterogeneous photocatalyst HCa2TaNb2O10/(Zn2/3Pb1/3S)was fabricated by successive ion-exchange, amine pillared and sulfidation reactionthrough conventional preparation method and microwave-assisted method,respectively. The band-to-band absorption edge of HCa2TaNb2O10/(Zn2/3Pb1/3S) wasexpanded to visible light range by the co-intercalation of ZnS and PbS. Thephotocatalytic activitie of HCa2TaNb2O10/(Zn2/3Pb1/3S) nanocomposite was superiorto that of as-prepared samples by conventional preparation method. With use ofHCa2TaNb2O10/(Zn2/3Pb1/3S) prepared by microwave-assisted method as a catalyst,the photocatalytic hydrogen evolution was more than384μmol/g·h in the presence ofSO32-and S2-as a sacrificial agent under irradiation with visible light, which wassuperior than that of samples （341μmol/g·h） prepared by traditional method.

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