Photocatalytic nitrogen fixation technology takes clean solar energy as the driving energy,using rich nitrogen and water as raw materials.Adhering to the principle of green and sustainable development,it is a potential technology for ammonia synthesis.However,the reaction efficiency of photocatalytic nitrogen reduction is generally low,which seriously restricts the application and development of this technology.Based on the introduction of ni-trogen reduction process,the main challenges of photocatalytic nitrogen fixation system are pointed out in this paper at present.The modification strategies of semiconductor nanomate-rials and the cases for photocatalytic nitrogen fixation reported in recent years are reviewed mainly from enhancing light absorption,accelerating the separation and transfer of photoge-nerated charges,and promoting N2 adsorption and activation.Finally,the future develop-ment trend of this field is analyzed and prospected.
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