**4. Conclusions**

The conclusions on this chapter are as follows:


vi. Under the condition of CO2/NH3/H2O, the molar ratio of CO2/NH3/H2O is 1:1:1 under the illumination condition with UV as well as without UV. The highest molar quantities of CO and CH4 per weight of photocatalyst obtained in this study are 10.2 and 1.8 μmol/g, respectively.

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