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Synthesis of Highly Active Heterostructured Al2TiO5/TiO2 Photocatalyst in a Neutral Medium
Journal of Nanomaterials ( IF 3.791 ) Pub Date : 2020-12-28 , DOI: 10.1155/2020/6684791
Nguyen D. Trung 1, 2 , Nguyen Tri 1, 3 , Phan H. Phuong 4, 5 , Ha C. Anh 1, 4, 5
Affiliation  

In this work, heterostructured catalyst Al2TiO5/TiO2 (ATO/Ti) was synthesized by a two-step method: low-temperature sol-gel process along with hydrothermal treatment in a neutral medium. Characteristics of the fabricated catalyst were analyzed by various techniques including X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer-Emmett-Teller adsorption, UV-Vis diffuse reflectance spectroscopy, energy-dispersive X-ray spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and the point of zero charges. The content of ATO strongly affected the activity of ATO/Ti catalysts for photocatalytic degradation of cinnamic acid (CA). The catalyst, in which 33% TiO2 was replaced by ATO (33ATO/Ti), exhibited the highest activity for the removal of CA. Compared with the bare titanium oxide synthesized in water (TiO2(w)) as well as Al2TiO5 (ATO), the hybrid 33ATO/Ti catalyst exhibited the enhanced photocatalytic activity in the CA degradation under ultraviolet light. The enhancement in the catalytic activity of ATO/Ti could be related to the increase of the specific surface area and the reduction of bandgap energy obtained from the hybridization of TiO2(w) and ATO. The factors as the catalyst dosage (), the airflow rate (), and the solution initial pH (pH) affected the CA removal efficiency were studied on 33ATO/Ti catalyst. The optimum condition for photodegradation efficiency of CA was found to be at , , and . The highest 60-minute removal efficiency of CA reached 77.1% on 33ATO/Ti compared with 67.1% and 30.4% on TiO2(w) and on ATO, respectively. The recyclability of the 33ATO/Ti was also measured at the optimal parameters. The results showed that, compared with TiO2, the hybrid catalyst was easier to recover and reuse, and its activity decreased by 35% after 6 continuous cycles.

中文翻译:

中性介质中高活性杂结构Al2TiO5 / TiO2光催化剂的合成

在这项工作中,异质结构催化剂Al 2 TiO 5 / TiO 2(ATO / Ti)通过两步法合成:低温溶胶-凝胶法以及在中性介质中进行水热处理。通过各种技术分析了制得的催化剂的特性,包括X射线衍射,傅里叶变换红外光谱,Brunauer-Emmett-Teller吸附,UV-Vis漫反射光谱,能量色散X射线光谱,场发射扫描电子显微镜,透射电子显微镜,拉曼光谱和零电荷点。ATO的含量强烈影响ATO / Ti催化剂对肉桂酸(CA)光催化降解的活性。催化剂,其中33%TiO 2被ATO(33ATO / Ti)取代,表现出去除CA的最高活性。与在水中合成的裸露的二氧化钛(TiO 2(w))和在Al 2 TiO 5(ATO)中相比,杂化的33ATO / Ti催化剂在紫外光下CA降解中表现出增强的光催化活性。ATO / Ti催化活性的提高可能与比表面积的增加和TiO 2(w)与ATO的杂化获得的带隙能量的减少有关。催化剂用量(),气流速率(),在33ATO / Ti催化剂上研究了溶液的初始pH值(pH)对CA去除效率的影响。发现CA的光降解效率的最佳条件为 在33ATO / Ti上,CA的最高60分钟去除效率达到77.1%,而TiO 2(w)和ATO分别达到67.1%和30.4%。还以最佳参数测量了33ATO / Ti的可回收性。结果表明,与TiO 2相比,杂化催化剂更易于回收和再利用,连续6个循环后活性降低了35%。
更新日期:2020-12-28
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