As natural rutile and Thiobacillus ferrooxidans (T.f) are distributed widely in nature, they may contact with each other in some cases and cause energy exchange. The authors explored the probability of the utilization of photo-induced electrons from natural rutile by T.f and the mechanism of this process. In the experiment, natural rutile could reduce Fe3+ toFe2+ under sunlight, the reduction rate reached 101.8 mg/L·24 h-1, and T.f obtained energy by oxidizing Fe2+ to Fe3+. Based on this experiment, the authors designed a device than could capture photo-induced electrons and pass them to bacteria via Fe2+ /Fe3+ mediator. In this way, T.f could utilize energy derived from photo-electron transition. In 96 hours, the strain under photocatalysis reached a density that was 100 times higher than that of the sample without experiencing photocatalysis. These results show that photocatalysis can give energy to bacteria and accelerate its growth.