泡沫碳负载一维TiO2光热催化蒸发器的制备及污水蒸发降解性能

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中文摘要：界面光热水蒸发是极具研究前景的有机污水纯化技术,但也存在有机污染物在光热蒸发器表面沉积的问题.为此,本文将具有光催化效应的纳米TiO2引入到多孔泡沫碳光热吸收体中制备了复合光热催化蒸发器(CF@RT),并对复合材料的结构和光热催化性能进行了分析.结果表明,CF@RT中生长有大量直径约10nm的一维TiO2纳米棒,纳米棒均匀分散在泡沫碳表面和孔结构中;TiO2的引入有效拓宽了材料对光的响应范围,使复合材料具备光热和光催化双功能;多孔泡沫碳通过吸收可见-红外光转换为热能实现水的蒸发,一维TiO2则通过吸收紫外光形成电子-空穴对,并通过氧化还原反应实现污染物降解.同时,泡沫碳和TiO2的结合还使光热和光催化之间存在协同促进效应,光催化过程能抑制污染物沉积,促进光热水蒸发性能持续提升,光热效应又可加速光生电子-空穴对的分离和迁移,促进光催化降解.在太阳光照射下,最优体系CF@RT160在2.5h内使MB降解率达到74％,光热水蒸发率为0.89 kg·m-2·h-1,且经4次循环后,水蒸发率提升至 0.95 kg·m-2·h-1.

外文标题：Preparation of Carbon Foam-loaded One-dimensional TiO2 for Photothermal Catalytic Evaporators and Its Performances of Evaporation and Degradation for Waste water

外文摘要：Interfacial photothermal water evaporation is a very promising research technique for organic wastewater purification,but there is also the problem of organic pollutant deposition on the surface of the photothermal evaporator.In this paper,composite photothermal catalytic material(CF@RT)was prepared by introducing nano-TiO2 with photocatalytic effect into porous carbon foam photothermal absorber for simultaneous degradation of pollutants during photothermal wastewater evaporation.The structure and photothermal catalytic performance of this composite were analyzed.The results show that a large number of one-dimensional TiO2 nanorods with a diameter of about 10 nm were grown in CF@RT,and the nanorods were homogeneously dispersed on the surface of the carbon foam and in the pore structures.The introduction of TiO2 effectively broadens the range of the material's response to light,making the composite material dual-functional for photothermal and photocatalysis.Porous carbon foam evaporates water by absorbing visible-infrared light and converting it to heat,while one-dimensional TiO2 absorbs UV-visible light to form electron-hole pairs and degrades pollutants through redox eactions.Meanwhile,the combination of carbon foam and TiO2 also led to a synergistic promotional effect between photothermal and photocatalysis.The photocatalytic process inhibits pollutant deposition to promote the continuous enhancement of the evaporation performance of the photo-thermal conversion,and the photothermal effect accelerates the separation and migration of photogenerated electron-hole pairs to promote photocatalytic degradation.Under one solar irradiation,the MB degradation rate of the most effective CF@RT sample reached 74％in 2.5 h with a photothermal water evaporation rate of 0.89 kg·m-2·h-1.It is worth mentioning that the water evaporation of the composite evaporator has revealed a featured improvement up to 0.95 kg·m-2·h-1 after 4 cycles.

外文关键词：

Carbon foamOne-dimensional TiO2Solar steam generationPhotothermal catalysis

作者：

张义东、袁家相、方伟、陆成龙、陈辉、何漩、杜星、李薇馨、王大珩、赵雷

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作者单位：

武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉 430081

湖北理工学院材料科学与工程学院,黄石 435003

关键词：

泡沫碳一维TiO2 光热水蒸发光热催化

基金：

国家自然科学基金国家自然科学基金湖北省重点研发计划项目湖北省自然科学基金湖北省自然科学基金湖北省自然科学基金湖北省教育厅科学技术研究项目省部共建耐火材料与冶金国家重点实验室开放基金

项目编号：

22105151523052112022BAA0942021CFB4692022CFB6262023AFB626B2022017G202407

出版年：

2024

DOI：

10.7503/cjcu20240295

高等学校化学学报

中华人民共和国教育部委托吉林大学和南开大学

高等学校化学学报

CSTPCD北大核心

影响因子：1.067

ISSN：0251-0790

年,卷(期)：2024.45(10)