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Chlorophyll-sensitized phenolic resins for the photocatalytic degradation of methylene blue and synthetic blue wastewater
Journal of Sol-Gel Science and Technology ( IF 2.3 ) Pub Date : 2021-11-09 , DOI: 10.1007/s10971-021-05674-z
Daniel Olivo-Alanís 1 , Marina Montserrat Atilano-Camino 1 , Alcione García-González 1 , Refugio Bernardo García-Reyes 1 , Luis Humberto-Álvarez 2
Affiliation  

A novel method was proposed to incorporate chlorophyll molecules into the phenolic resins for the photocatalytic degradation of methylene blue and synthetic blue wastewater (a mixture used as a disinfectant in airplanes, trains, and ships). A solvent-extraction method was employed for obtaining chlorophyll molecules. About 90% of the obtained chlorophyll was successfully incorporated into the phenolic resin via the Fischer esterification reaction. In addition, FTIR and UV-Vis spectrophotometry confirmed the immobilization of chlorophyll into the polymer. Although the studied photocatalysts showed the same energy gap (about 2.16 eV) and electrochemical potentials (around −0.425 V and 1.950 V), the sensitized material achieved a higher photocatalytic degradation of methylene blue in alkaline and acidic conditions. In addition, the effective photocatalytic mechanism model demonstrates the selective anion radical attack of methylene blue. Interestingly, the photocatalytic degradation of synthetic blue wastewater shows a contradictory behavior compared to the methylene blue experiments. It was enhanced at acidic conditions, reached complete decolorization, and 40% of TOC removal after 6 h of continuous irradiation. In conclusion, photocatalysis was employed to degrade synthetic blue wastewater for the first time, showing a well-functionality on a full irradiated stirred tank with the chlorophyll-sensitized phenolic resin.



中文翻译:

用于光催化降解亚甲蓝和合成蓝废水的叶绿素敏化酚醛树脂

提出了一种将叶绿素分子掺入酚醛树脂中的新方法,用于光催化降解亚甲蓝和合成蓝废水(一种在飞机、火车和轮船中用作消毒剂的混合物)。采用溶剂萃取法获得叶绿素分子。大约 90% 的叶绿素通过 Fischer 酯化反应成功地结合到酚醛树脂中。此外,FTIR 和紫外-可见分光光度法证实了叶绿素固定在聚合物中。尽管所研究的光催化剂表现出相同的能隙(约 2.16 eV)和电化学势(约 -0.425 V 和 1.950 V),但敏化材料在碱性和酸性条件下实现了更高的亚甲基蓝光催化降解。此外,有效的光催化机理模型证明了亚甲蓝的选择性阴离子自由基攻击。有趣的是,与亚甲蓝实验相比,合成蓝色废水的光催化降解表现出矛盾的行为。它在酸性条件下得到增强,在连续照射 6 小时后达到完全脱色和 40% 的 TOC 去除率。总之,光催化首次用于降解合成蓝色废水,在具有叶绿素敏化酚醛树脂的全辐照搅拌罐上显示出良好的功能。它在酸性条件下得到增强,在连续照射 6 小时后达到完全脱色和 40% 的 TOC 去除率。总之,光催化首次用于降解合成蓝色废水,在具有叶绿素敏化酚醛树脂的全辐照搅拌罐上显示出良好的功能。它在酸性条件下得到增强,在连续照射 6 小时后达到完全脱色和 40% 的 TOC 去除率。总之,光催化首次用于降解合成蓝色废水,在具有叶绿素敏化酚醛树脂的全辐照搅拌罐上显示出良好的功能。

更新日期:2021-11-10
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