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采用改进的溶胶-凝胶法制备的钛酸铁纳米颗粒在自然阳光下对亚甲基蓝进行光催化降解。

Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol-gel method.

作者信息

Vasiljevic Z Z, Dojcinovic M P, Vujancevic J D, Jankovic-Castvan I, Ognjanovic M, Tadic N B, Stojadinovic S, Brankovic G O, Nikolic M V

机构信息

Institute of Technical Sciences of SASA, Belgrade, Serbia.

Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia.

出版信息

R Soc Open Sci. 2020 Sep 2;7(9):200708. doi: 10.1098/rsos.200708. eCollection 2020 Sep.

DOI:10.1098/rsos.200708
PMID:33047033
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7540765/
Abstract

The aim of this work was to synthesize semiconducting oxide nanoparticles using a simple method with low production cost to be applied in natural sunlight for photocatalytic degradation of pollutants in waste water. Iron titanate (FeTiO) nanoparticles with an orthorhombic structure were successfully synthesized using a modified sol-gel method and calcination at 750°C. The as-prepared FeTiO nanoparticles exhibited a moderate specific surface area. The mesoporous FeTiO nanoparticles possessed strong absorption in the visible-light region and the band gap was estimated to be around 2.16 eV. The photocatalytic activity was evaluated by the degradation of methylene blue under natural sunlight. The effect of parameters such as the amount of catalyst, initial concentration of the dye and pH of the dye solution on the removal efficiency of methylene blue was investigated. FeTiO showed high degradation efficiency in a strong alkaline medium that can be the result of the facilitated formation of OH radicals due to an increased concentration of hydroxyl ions.

摘要

这项工作的目的是使用一种生产成本低的简单方法合成半导体氧化物纳米颗粒，以应用于自然阳光下，用于光催化降解废水中的污染物。采用改进的溶胶-凝胶法并在750°C下煅烧，成功合成了具有正交结构的钛酸铁（FeTiO）纳米颗粒。所制备的FeTiO纳米颗粒表现出适中的比表面积。介孔FeTiO纳米颗粒在可见光区域具有强烈的吸收，其带隙估计约为2.16 eV。通过在自然阳光下亚甲基蓝的降解来评估光催化活性。研究了催化剂用量、染料初始浓度和染料溶液pH值等参数对亚甲基蓝去除效率的影响。FeTiO在强碱性介质中表现出高降解效率，这可能是由于氢氧根离子浓度增加促进了羟基自由基的形成。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8f79/7540765/8002fd4444cf/rsos200708-g8.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8f79/7540765/8002fd4444cf/rsos200708-g8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8f79/7540765/4dd823107005/rsos200708-g1.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8f79/7540765/de6b01d6200b/rsos200708-g7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/8f79/7540765/8002fd4444cf/rsos200708-g8.jpg

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