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光催化水處理與氧還原的研究

主講人:龍明策 教授

時間:2019年6月13日 上午11:00

地點: 材料化學工程國家重點實驗室大樓四樓中庭報告廳

主講人介紹:

龍明策天王彩票|手机app下载,男天王彩票|手机app下载,工學博士,上海交通大學環境科學與工程學院研究員,博士生導師。1999年畢業于哈爾濱工業大學應用化學系,2007年獲上海交通大學環境工程博士學位,2006和2013年分別在德國埃爾蘭根-紐倫堡大學和美國萊斯大學訪學。主要研究方向為有機污染控制的光催化與化學氧化技術。作為項目負責人承擔國家自然科學基金、農業部行業科研專項天王彩票|手机app下载、重點研發專項天王彩票|手机app下载、上海市科委項目等10余項,在ACS Nano、Appl Catal B、Environ Sci Technol等刊物共發表SCI論文76篇天王彩票|手机app下载,被引3537次,H因子27,授權專利16項天王彩票|手机app下载。目前任Nano-Micro Letters編委和Chinese Journal of Catalysis青年編委天王彩票|手机app下载。 

主要內容:

Lead chromate pigments are included in a group of the most widely used pigments, which account for 3% of worldwide lead consumption. This study reports the photoactivity of commercial lead chromate pigment (i.e., chrome yellow) under simulated sunlight. It underwent photodissolution in the presence of organic acid and dissolved organic matter in the aqueous phase, releasing Pb(II) and Cr(III). Pb(II) was released more readily than Cr(III) which mainly formed hydroxides and oxides. The photodissolution can be activated by light with a wavelength <514 nm. the reaction is mediated by the reduction of cr(vi) in the pigment by self-generated electrons. the kinetics were mainly affected by the electron-hole separation efficiency which can be enhanced by electron donors. the reaction rate decreases with increasing solution ph as the photodissolution process consumes protons. the photodissolution of the chrome yellow pigment was further confirmed in a river water sample under natural sunlight, with 11.28% of lead and 2.56% of chromium released in 7 h. this study highlights the importance of considering photochemical processes in risk assessments and regulations of commercial semiconductor pigments, which are currently based on their solubility.


主辦單位:材料化學工程國家重點實驗室


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