In situ hydrothermal synthesis of Y-TiO2/graphene heterojunctions with improved visible-light-driven photocatalytic properties |
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| Affiliation: | 1. School of Science, Xi’an Polytechnic University, Xi’an 710048, PR China;2. Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan 430072, PR China;3. College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, Zhejiang 314001, PR China;1. Instituto de Ciencia de Materiales de Aragón (ICMA), CSIC–Universidad de Zaragoza, E50018 Zaragoza, Spain;2. Centro Universitario de la Defensa, General Military Academy, Ctra. Huesca s/n, E50090 Zaragoza, Spain;1. Centre for Nano Science and Engineering, Indian Institute of Science, Bengaluru 560012, India;2. Materials Research Centre, Indian Institute of Science, Bengaluru 560012, India;1. PG & Research Department of Physics, National College (Autonomous), Affiliated to Bharathidasan University, Tiruchirappalli, 620 001, Tamil Nadu, India;2. PG & Research Department of Chemistry, Bishop Heber College (Autonomous), Affiliated to Bharathidasan University Tiruchirappalli, 620 017, Tamil Nadu, India;3. Department of Chemistry, Periyar Maniammai Institute of Science and Technology, Vallam, Thanjavur, 613 403, Tamil Nadu, India;1. Inst. Ciencia de Materiales de Sevilla (CSIC-US), Américo Vespucio 49, 41092 Sevilla, Spain;2. Dpto. de Física de la Materia Condensada. Univ. de Sevilla, Apdo. 1065, 41080 Sevilla, Spain |
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| Abstract: | The Y-TiO2/graphene heterojunctions were prepared using a facile one-pot hydrothermal method. The SEM and TEM images showed that titanium dioxide and flaky graphene were tightly bound together, and XPS indicated that yttrium was doped uniformly into the complex. The crystal phase of titanium dioxide in Y-TiO2/graphene composite was anatase, and the yttrium doping caused distortion of the titanium dioxide lattice, resulting in a new valence type and more defects. An appropriate amount of yttrium doping and graphene modification significantly improved the separation of photogenerated electron-hole pairs. In the degradation of rhodamine B, the co-modification of yttrium and graphene effectively improved the photocatalytic activity under visible and UV–vis light irradiation. With the amount of yttrium increasing, the photocatalytic activity of the Y-TiO2/graphene complex first increased and reached the highest level of 40% and 63% for visible and ultraviolet-visible light, respectively, when the ratio of yttrium was increased to 1.0%. The enhancement of photocatalytic activity can be explained by the presence of yttrium ions increased the visible light absorption of titanium dioxide. Besides, the synergistic effect between yttrium ions and graphene effectively improved the separation rate of photoinduced electron-hole pairs. |
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| Keywords: | In situ hydrothermal synthesis Co-modification of yttrium and graphene Improved visible-light-driven photocatalysis Photoinduced electron-hole pairs |
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