自19世纪70年代发现了半导体材料光催化裂解水的现象以来，光催化氧化技术得到迅速发展。光催化技术具有催化材料易得，运行成本低，可利用太阳光作为光源等优点，是一种具有巨大潜在应用价值的污染治理技术。常用的金属氧化物光催化剂有：Fe2O3、WO3、Cr2O3、ZnO、ZrO、TiO2等。其中TiO2来源广、化学稳定性和催化活性高，无毒性，成为研究中使用广泛的光催化剂之一，光催化是基于光激发半导体材料而产生的电子-空穴对，激发的电子和空穴迁移到半导体颗粒表面；如果能带边缘（bandedge）位置符合某种要求时，光生电子和空穴就会与吸附水或有机物发生氧化还原反应，从而实现光催化作用。本书针对光催化剂的发展和在能源领域的应用研究，做了系统总结和整理，概括为以下几个内容：（1）光催化科学的发展进程；（2）光催化剂的制备与修饰进展；（3）光催化技术在制氢方面的研究进展；（4）光催化技术在CO2能源转化方面的研究进展。

　　耿启金，Qijin Geng, Ph.D, Associate Professor of College of Chemistry-Chemical & Environmental Engineering, Weifang University. The membership in Chemistry Association of China.
　　Add: College of Chemistry and Chemical Engineering, Weifang University, Shandong Province, 261061, P. R. China.
　　Qijin Geng was born in China in December, 1969. He gained lus bachelor degree from College of Textile Chemical Engineering in Qingdao University in 1992. The master degree of applied chemistry was obtained in Jinan University in 2004 and Ph. D degree of chemical engineering at Qingdao University of Science and Technology, Shandong Province, P. R. China in 2011. The speciality is photocatalytic decomposition of waste water and gaseous pollutants, building materials, nano-sized material preparation, and multi-phase fluidization reaction engineering.
　　He has published about 50 academic paper in chemical engineering and environmental science joumal, such as Industrial & Engineering Chenustry Research （IEC）, Environmental Technology （TENT）, Chemical Engineering & Technology （CET）, Research on Chemical Intermediates （Res. Chem. Intermed.）, New Building Material （NBM） and Biomedical and Environmental Science （BES）, et al. Consequently, he was invited by some journals as a reviewer, such as Journal of Environmental Management, Research on Chemical Intermediates, Separation Science and Technology, Joumal of Chemical Technology & Biotechnology, International Research Journals of Biochemistry and Bioinformatics, Chemical Engineering Journal, Journal of Environmental Sciences, Environmental Science and Pollution Research, etc.