Synthesis of g-C3N4/Nb2O5 heterostructures and their application in the removal of organic pollutants under visible and ultraviolet irradiation |
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| Affiliation: | 1. Laboratório Nacional de Nanotecnologia para o Agronegócio (LNNA) – Embrapa Instrumentação, Rua XV de Novembro, 1452 – CP 741, CEP 13561-206 São Carlos, SP, Brazil;2. Departamento de Química, Universidade Federal de São Carlos – UFSCar, Rod. Washington Luiz, km 235 – CP 676, CEP 13565-905 São Carlos, SP, Brazil;1. School of Aerospace, Tsinghua University, Beijing 100084, PR China;2. China Special Equipment Inspection & Research Institute, Beijing 100013, PR China;1. School of Chemical Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia;2. Institute for NanoScience Design, Osaka University, 1-3 Machikaneyama, Toyonaka Osaka, Japan;1. Universidade Estadual de Maringá, Av. Colombo 5790, Maringá 87020-900, Brazil;2. Universidade Tecnológica Federal do Paraná, Rua Marcílio Dias 635, Apucarana 86812-460, Brazil;1. Department of Petrochemical Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia;2. Department of Environmental Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, Jalan Universiti, Bandar Barat, 31900 Kampar, Perak, Malaysia;1. Embrapa Instrumentation, Rua XV de Novembro 1452, 13560-970, CP 741, São Carlos, SP, Brazil;2. Department of Chemistry, Federal University of São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos, SP, Brazil;3. Department of Materials Engineering, Federal University of São Carlos, Rodovia Washington Luiz, km 235, 13565-905 São Carlos, SP, Brazil;1. Centre for Materials for Electronics Technology (C-MET), Ministry of Electronics and Information and Technology (MeitY), Government of India, Panchawati Off Pashan Road, Pune 411008, India;2. Prof. John Barnabas School for Biological Studies, Department of Chemistry, Ahmednagar College, Ahmednagar 41400, India;3. Department of Physics, Savitribai Phule Pune University, Pune 411007, Maharashtra, India;4. Belmont School Belmont USA, MA, 02478, USA;5. Department of Chemistry, Shivaji University, Kolhapur 416004, Maharashtra, India |
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| Abstract: | ![]()
This paper describes the synthesis of a new series of g-C3N4/Nb2O5 heterostructures and their application in the removal of organic pollutants from water, as a combined strategy of photocatalysis and adsorption processes. The heterostructures were synthesized at different weight ratios through thermal oxidation and hydrothermal treatment, leading to an uniform assembly of Nb2O5 nanoparticles onto g-C3N4 surface. The heterostructures exhibited improved textural and electronic properties (narrowing in band gap) when compared to pure g-C3N4 and Nb2O5, respectively. Although adsorption capacities were shown to be influenced by Nb2O5 content, g-C3N4 was essential to increase the photocatalytic response of the g-C3N4/Nb2O5 heterostructures, which displayed an enhancement of photocatalytic performance on the degradation of methylene blue and rhodamine B dyes under visible and ultraviolet irradiation. The enhanced photoactivity was explained by the increase in the lifetime of the charge carries due to formation of heterojunctions between Nb2O5 and g-C3N4. A mechanistic investigation on the photocatalytic process was conducted by using different reactive scavenger species. The superoxide (O2−•) radical was found to be the main active specie on the dye photodegradation activated by visible radiation. |
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| Keywords: | Organic dye Water decontamination Adsorption Photodegradation mechanism |
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