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Co3O4/TiO2 Nanocomposite Formation Leads to Improvement in Ultraviolet–Visible-Infrared-Driven Thermocatalytic Activity Due to Photoactivation and Photocatalysis–Thermocatalysis Synergetic Effect
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-21 00:00:00 , DOI: 10.1021/acssuschemeng.8b03602 Zhengkang Shi 1 , Lan Lan 1 , Yuanzhi Li 1 , Yi Yang 1 , Qian Zhang 1 , Jichun Wu 1 , Gequan Zhang 1 , Xiujian Zhao 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-10-21 00:00:00 , DOI: 10.1021/acssuschemeng.8b03602 Zhengkang Shi 1 , Lan Lan 1 , Yuanzhi Li 1 , Yi Yang 1 , Qian Zhang 1 , Jichun Wu 1 , Gequan Zhang 1 , Xiujian Zhao 1
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Co3O4/TiO2 nanocomposites with different Co/Ti molar ratios were prepared by hydrolysis of cobalt acetate with urea in the presence of TiO2, and then calcined at 260 °C. Compared to pure TiO2, the Co3O4/TiO2 nanocomposite with the optimum Co/Ti molar ratio of 0.30 demonstrates significantly enhanced catalytic activity as well as excellent catalytic durability for abatement of refractory poisonous benzene (a typical air pollutant) with ultraviolet–visible-infrared (UV–vis-IR) irradiation. It also exhibits effective catalytic activity for benzene abatement even with λ > 830 nm IR irradiation. Its very high catalytic activity derives from light-driven thermocatalytic benzene oxidation on nano Co3O4 in the Co3O4/TiO2 nanocomposite. A novel synergetic effect among light-driven thermocatalysis on Co3O4 and UV photocatalysis on TiO2 in the Co3O4/TiO2 nanocomposite is discovered to remarkably promote catalytic activity and improve catalytic durability by inhibiting the formation of refractory carbonaceous intermediates on TiO2 by photocatalysis: energetic species produced by UV photocatalysis on TiO2 move from TiO2 to Co3O4 through the interface between nano Co3O4 and TiO2, thus accelerating the light-driven thermocatalytic benzene oxidation on nano Co3O4. A novel photoactivation, completely different from photocatalysis on TiO2, is discovered to further considerably accelerate light-driven thermocatalytic activity of Co3O4: Irradiation not only promotes the activity of lattice oxygen of nano Co3O4 but also accelerates the reoxidation of the reduced cobalt oxide (Co3O4–x), resulting in a considerable enhancement in the light-driven thermocatalytic activity of Co3O4. The light-driven themocatalysis together with the novel photocatalysis–thermocatalysis synergetic effect and photoactivation in the Co3O4/TiO2 nanocomposite cause a tremendous enhancement of 489 times in benzene mineralization rate (initial production rate of CO2) as compared to the photocatalytic benzene abatement under UV–vis-IR irradiation with the same light intensity at near room temperature.
中文翻译：
Co 3 O 4 / TiO 2纳米复合材料的形成由于光活化和光催化-热催化的协同作用而改善了紫外-可见-红外驱动的热催化活性。
在TiO 2存在下，用尿素水解乙酸钴，然后在260°C下煅烧，制备出具有不同Co / Ti摩尔比的Co 3 O 4 / TiO 2纳米复合材料。与纯TiO 2相比，Co 3 O 4 / TiO 2具有0.30的最佳Co / Ti摩尔比的纳米复合材料，可显着增强催化活性，并具有优异的催化耐久性，可通过紫外-可见-红外（UV-vis-IR）辐照消除难处理的有毒苯（一种典型的空气污染物）。即使在λ> 830 nm IR辐射下，它也表现出有效的催化活性以减少苯。其非常高的催化活性来自光驱动的热催化苯在Co 3 O 4 / TiO 2纳米复合材料中的纳米Co 3 O 4上的氧化。光驱动热催化Co 3 O 4与紫外光催化TiO 2的协同效应在Co 3 O 4 / TiO 2纳米复合材料中，通过抑制光催化作用在TiO 2上形成难熔的碳质中间体，可显着提高催化活性并提高催化耐久性：紫外光催化TiO 2产生的高能物质从TiO 2迁移至Co 3 O 4通过纳米Co 3 O 4与TiO 2之间的界面，从而加速了光驱动的热催化苯氧化在纳米Co 3 O 4上的氧化。一种新颖的光活化作用，与TiO上的光催化作用完全不同发现2可以进一步显着加速Co 3 O 4的光驱动热催化活性：辐照不仅可以促进纳米Co 3 O 4的晶格氧活性，而且可以促进还原的氧化钴（Co 3 O 4– x），大大提高了Co 3 O 4的光驱动热催化活性。Co 3 O 4 / TiO 2中光驱动的热催化以及新型的光催化-热催化协同作用和光活化与在近室温下以相同的光强度在紫外可见光谱下进行光催化苯消除相比，纳米复合材料可大大提高苯的矿化速率（CO 2的初始产生速率）489倍。
更新日期：2018-10-21
中文翻译：
Co 3 O 4 / TiO 2纳米复合材料的形成由于光活化和光催化-热催化的协同作用而改善了紫外-可见-红外驱动的热催化活性。
在TiO 2存在下，用尿素水解乙酸钴，然后在260°C下煅烧，制备出具有不同Co / Ti摩尔比的Co 3 O 4 / TiO 2纳米复合材料。与纯TiO 2相比，Co 3 O 4 / TiO 2具有0.30的最佳Co / Ti摩尔比的纳米复合材料，可显着增强催化活性，并具有优异的催化耐久性，可通过紫外-可见-红外（UV-vis-IR）辐照消除难处理的有毒苯（一种典型的空气污染物）。即使在λ> 830 nm IR辐射下，它也表现出有效的催化活性以减少苯。其非常高的催化活性来自光驱动的热催化苯在Co 3 O 4 / TiO 2纳米复合材料中的纳米Co 3 O 4上的氧化。光驱动热催化Co 3 O 4与紫外光催化TiO 2的协同效应在Co 3 O 4 / TiO 2纳米复合材料中，通过抑制光催化作用在TiO 2上形成难熔的碳质中间体，可显着提高催化活性并提高催化耐久性：紫外光催化TiO 2产生的高能物质从TiO 2迁移至Co 3 O 4通过纳米Co 3 O 4与TiO 2之间的界面，从而加速了光驱动的热催化苯氧化在纳米Co 3 O 4上的氧化。一种新颖的光活化作用，与TiO上的光催化作用完全不同发现2可以进一步显着加速Co 3 O 4的光驱动热催化活性：辐照不仅可以促进纳米Co 3 O 4的晶格氧活性，而且可以促进还原的氧化钴（Co 3 O 4– x），大大提高了Co 3 O 4的光驱动热催化活性。Co 3 O 4 / TiO 2中光驱动的热催化以及新型的光催化-热催化协同作用和光活化与在近室温下以相同的光强度在紫外可见光谱下进行光催化苯消除相比，纳米复合材料可大大提高苯的矿化速率（CO 2的初始产生速率）489倍。
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