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rensu木蟲 (小有名氣)
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TiO2 光催化交流貼 (2) --- 顆粒尺寸和結(jié)晶度對催化性能的影響 已有8人參與
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長久以來,大家都認(rèn)識到結(jié)晶度和晶粒尺寸對TiO2的光催化性能有很大的影響。但是由于制備條件的限制,很難同時控制TiO2樣品的結(jié)晶度和晶粒尺寸,嚴(yán)重影響了我們深入了解二者對光催化性能和反應(yīng)過程的理解,從而無法更好的設(shè)計(jì)新型的催化劑。 在這篇文章中,我們首先利用超臨界合成方法制備了兩個系列的純anatase。其中C系樣品只改變結(jié)晶度而具有相同的晶粒尺寸,S系樣品只改變晶粒尺寸而具有相同的結(jié)晶度。在此基礎(chǔ)上,我們深入研究了結(jié)晶度和晶粒尺寸對光催化降解苯酚的影響。實(shí)驗(yàn)結(jié)果表明,結(jié)晶度對光催化降解苯酚基本沒有影響,而晶粒較大的anatase活性比小晶粒anatase要好。 我們接下來深入分析了光催化降解苯酚的動力學(xué)參數(shù),驚奇的發(fā)現(xiàn)晶粒對苯酚降解的過程影響非常大,預(yù)知詳情,請看全文。。。 (不好意思,打字實(shí)在太累了)Abstract Crystallite size and crystallinity have been recognized as important parameters that influence the photocatalytic performance of pristine TiO2 nanoparticles. But how these two parameters individually affect the photo-reactivity of TiO2 remains unclear and debated due to the difficulties in preparing well-controlled TiO2 photocatalysts that vary crystallite size and crystallinity independently. Here, we have studied the effect of crystallite size and crystallinity on phenol photo-decomposition using well-defined anatase nanoparticles synthesized under supercritical water–isopropanol conditions. The photo-reactivity was found to increase with increasing crystallite size but to be independent of the crystallinity. By tracking the evolution of phenolic intermediates, we explored the reaction kinetics and demonstrated that an increase in the crystallite size of anatase nanoparticles can significantly suppress undesired hydroquinone–benzoquinone redox reactions and thus promote the full decomposition of phenol and phenolic compounds. 全文鏈接: http://www.sciencedirect.com/sci ... i/S0021951713001589 toc_rs.jpg |
光催化專輯 | 文獻(xiàn) | 我的收藏 |
木蟲 (小有名氣)
鐵桿木蟲 (職業(yè)作家)
Mr

鐵桿木蟲 (職業(yè)作家)
Mr

木蟲 (小有名氣)
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