**4. Conclusions**

**Figure 16** shows the comparison of molar quantities of CO per weight of photocatalyst among the prepared photocatalysts. These values are estimated based on the maximum CO obtained under the no-UV illumination condition up to 96 h. It reveals that the molar quantity of CO

tion performance in terms of molar quantity of CO per weight of photocatalyst is achieved in

is positioned under the netlike glass disc, can utilize at least some of the light penetrating through the aperture of netlike glass disc for photochemical reactions, although the wave-

The bigger synergy effect in terms of molar quantity of CO per weight of photocatalyst for two overlapped photocatalysts in no-UV cases is achieved when comparing with UV illumination cases. Since the photochemical reaction rate and the amount of produced fuel are small under the no-UV illumination condition compared to those under UV light, it would be ben-

of photocatalyst in no-UV cases. As a result, the mass transfer and photochemical reaction are carried out effectively in no-UV cases. Therefore, the molar quantity of CO per weight of photocatalyst for overlapping cases is large in no-UV cases. According to previous reports

mental conditions. In addition, it also reveals the positive effect of overlapping on CO<sup>2</sup>

both single and double overlapping cases. It is believed that Fe/TiO<sup>2</sup>

eficial to the mass transfer between produced fuel and reactant of CO<sup>2</sup>

[27, 28], the mass transfer is an inhibition factor to promote the CO<sup>2</sup>

length of the penetrating light becomes long.

78 Carbon Dioxide Chemistry, Capture and Oil Recovery

under the double overlapping condition is the highest among all experi-

reduction performances per weight of photocatalyst under the illumination condition

reduc-

coated on Cu disc, which

O on the surface

reduction performance of

and H<sup>2</sup>

per weight of Fe/TiO<sup>2</sup>

**Figure 16.** Comparison of CO<sup>2</sup>

without UV light.

Based on the investigation into this study, the following conclusions can be drawn:

**1.** TiO2 film with teethlike shape could be coated on netlike glass fiber, and Fe fine particles are loaded without agglomeration. However, TiO<sup>2</sup> film would contract around Fe particles when Fe/TiO<sup>2</sup> was coated on the Cu disc.


[3] Sakakura T, Choi J-C, Yasuda H. Transformation of carbon dioxide. Chemical Reviews.

[4] Adachi K, Ohta K, Mizuno T. Photocatalytic reduction of carbon dioxide to hydrocarbon

[6] Dey GR, Belapurkar AD, Kishore K. Photo-catalytic reduction of carbon dioxide to meth-

mixed with copper powder. Journal of Photochemistry and Photobiology A: Chemistry.

[8] Ishitani O, Inoue C, Suzuki Y, Ibusuki T. Photocatalytic reduction of carbon dioxide

[9] Kaneco S, Kurimoto H, Shimizu Y, Ohta K, Mizuno T. Photocatalytic reduction of CO<sup>2</sup>

[10] Gui MM, Chai S-P, Xu B-Q, Mohamed AR. Enhanced visible light responsive MWCNT/

core-shell nanocomposites as the potential photocatalyst for reduction of CO<sup>2</sup>

photocatalyst for the preferential reduction of carbon dioxide in the presence of water.

[13] Michalkiewicz B, Majewska J, Kadziolka G, Bubacz K, Mozia S, Morawski AW. Reduction

[16] Subramanian M, Vijayalakshmi S, Venkataraj S, Jayavel R. Effect of cobalt doping on the

reduction to CO and CH4

to methane and acetic acid by an aqueous suspension of metal-doped TiO<sup>2</sup>

Photochemistry and Photobiology A: Chemistry. 1993;**72**:269-271

methane. Solar Energy Materials & Solar Cells. 2014;**122**:183-189

[12] Beigi AA, Fatemi S, Salehi Z. Synthesis of nanocomposite CdS/TiO<sup>2</sup>

Utilization. 2014;**7**:23-29

[14] Lee C-W, Kourounioti RA, Wu JCS. Photocatalytic conversion of CO<sup>2</sup>

. Topics in Catalysis. 2007;**44**:523-528

by adsorption and reaction on surface of TiO<sup>2</sup>

Utilization. 2014;**5**:47-52

by light-harvesting complex assisted Rh-doped TiO<sup>2</sup>

[15] Ozcan O, Yukruk F, Akkaya EU, Uner D. Dye sensitized CO<sup>2</sup>

structural and optical properties of TiO<sup>2</sup>

[11] Xie S, Wang Y, Zhang Q, Deng W, Wang Y. MgO and Pt-promoted TiO<sup>2</sup>

as suspension in water. Journal of Photochemistry and Photobiology A:

Effect of Overlapping Fe/TiO2 Coated on Netlike Glass Disc and Cu Disc on CO2 Reduction

. Energy. 1999;**24**:21-30

on anchored titanium oxide catalysts.

http://dx.doi.org/10.5772/intechopen.70389

in aqueous TiO<sup>2</sup>

suspension

81

. Journal of

into

as an efficient

and investigation of

to hydrocarbons

under visible light irradia-


photocatalyst. Journal of CO<sup>2</sup>

film prepared by sol-gel process. Thin Solid

reduction over pure and

using copper-loaded titanium dioxide. Solar Energy. 1994;**53**:187-190

[5] Anpo M, Chiba K. Photocatalytic reduction of CO<sup>2</sup>

Journal of Molecular Catalysis. 1992;**74**:207-212

[7] Hirano K, Inoue K, Yatsu T. Photocatalysed reduction of CO<sup>2</sup>

powders in supercritical fluid CO<sup>2</sup>

2007;**107**:2365-2387

ane using TiO<sup>2</sup>

1992;**64**:255-258

using TiO<sup>2</sup>

TiO2

of CO<sup>2</sup>

Journal of CO<sup>2</sup>

platinized TiO<sup>2</sup>

Chemistry. 2004;**163**:503-508

ACS Catalysis. 2014;**4**:3644-3653

its photocatalytic activity for CO<sup>2</sup>

tion. Journal of CO<sup>2</sup>

Utilization. 2014;**5**:33-40

Films. 2008;**516**:3776-3782

