1. LOGO Photocatalytic Reduction of Carbon Dioxide Using Heterostructure CdS-TiO 2 Photocatalyst to Hydrocarbon Supervisor : Xin Feng Supervisor : Xin Feng Reporter ： Song Guixian 2013/03/27

2. Contents  Photocatalytic reduction of CO 2 reaction process  Selected catalyst  Catalyst preparation  Scheme of prepared catalyst  Next plans

3. Photocatalytic reduction of CO 2 reaction process

5. Selected catalyst Oxidation process of cyclohexanol Reduction process of carbon dioxide

6. Selected catalyst Heterostructure CdS-TiO 2 photocatalyst CdS with band gap of 2.4 eV （ CB ， -1.0V ； VB ， 1.4V ， vs NHE at pH =7.0 ）， TiO 2 with band gap of 3.2eV （ CB ， -0.5V ； VB ， 2.7V ， vs NHE at pH =7.0 ） Fig.1. The mechanism of photocatalytic reduction of CO 2

7. Scheme of prepared catalyst Fig.2. The grow process of heterostructure CdS-TiO 2 photocatalyst

8. Catalyst preparation Prepared TiO 2 Tetrabutyl titanate +acetic acid Precursor solution Hydrothermal synthesis Centrifugation Dry Calcination to Detach impurity Product

9. Catalyst preparation Prepared CdS-TiO 2 Ultrasonic dispersion Titanium dioxide + deionized water Stir CdCl 2 ·2.5H 2 O aqueous solution Precursor solution Na 2 S ·9H 2 O aqueous solution In situ hydrothermal Centrifugation Dry Product

10. Characterization of UV–vis absorbance spectra Fig. 3. The UV–visible diffuse reflectance spectra of the samples

11. Next plans 1. Optimization of reaction conditions adopt single factor experiment. 2. The samples will be characterized on SEM 、 TEM 、 XRD 、 PL. 3. Photocatalytic reduction of CO 2 reaction will be carried out. 4. Product will be analyzed by GC-MS and GC.