@article { author = {Zarei Kiasari, Ebrahim}, title = {Photocatalysis; principles and some applications}, journal = {}, volume = {2}, number = {2}, pages = {15-22}, year = {2016}, publisher = {}, issn = {2645-3649}, eissn = {2645-3649}, doi = {}, abstract = {It has been proven that the presence of catalysts enhances the rate of reactions. Also, the role of TiO2 as a photocatalyst in oxidation and photodecomposition has been studied. On the other hand, the discharge of the colored compounds in the environment causes considerable non-aesthetic pollution and serious health-risk factors. Since conventional wastewater treatment plants cannot degrade the majority of these pollutants, powerful methods for the decontamination of dyes wastewaters have received increasing attention over the past decade. In this work, the contents have been presented about the principles of photocatalysis process. In this regard, band theory has been mentioned that it is indicative of the main cause of the difference between conductive, semiconductor and insulator materials. In the following, the phenomena occurring due to the optical excitation effect of a semiconductor have been discussed. Also, the structure of some allotropes of TiO2 has been investigated. In the end, briefly, some applications of photocatalysis process, particularly in the removals of pollutants from wastewater have been expressed.}, keywords = {Photocatalysis,Band theory,Semiconductor,TiO2,Removal of pollutants}, title_fa = {فوتوکاتالیز؛ اصول و برخی کاربردها}, abstract_fa = {در این کار، درباره‏ی اصول فرایند فوتوکاتالیز مطالبی ارائه ‏گردیده است. در این راستا، به نظریه‏ی نوار که بیان کننده علت اصلی اختلاف میان مواد رسانا، نیمه رسانا و نارساناست، اشاره شده است. در ادامه، پدیده‏هایی که در اثر تحریک نوری یک نیمه رسانا رخ می‏دهند، مورد بحث قرار گرفته‏اند. همچنین ساختار برخی دگر‏شکل‏های 2TiO به عنوان یک نیمه رسانای مناسب برای انجام فوتوکاتالیز، مورد بررسی قرار داده شده است. در پایان، به طور مختصر برخی کاربرد‏های فرایند فوتوکاتالیز به ویژه در حذف آلاینده‏ها از پساب‏ها بیان شده است.}, keywords_fa = {فوتوکاتالیز,نظریه‏ی نوار,نیمه رسانا,TiO2,حذف آلاینده‏ها}, url = {https://basicscience.cfu.ac.ir/article_251.html}, eprint = {https://basicscience.cfu.ac.ir/article_251_62d5641c1b58d46d3ffbab404880949f.pdf} }