Aerobic Oil-Phase Cyclic Magnetic Adsorption to Synthesize 1D Fe2O3@TiO2 Nanotube Composites for Enhanced Visible-Light Photocatalytic Degradation

Tao, Qingqing; Huang, Xin; Bi, Jingtao; Wei, Rongli; Xie, Chuang; Zhou, Yongzhu; Lu, Yu; Hao, Hongxun; Wang, Jingkang

doi:10.3390/nano10071345

Cited by 17 publications

(6 citation statements)

References 53 publications

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“…Heterostructure engineering is considered as another effective way to acquire photocatalytic materials with fine optical and electrical properties [ 6 , 7 , 8 ]. In this type of composite structure with enhanced photocatalytic performance, each component possesses theoretically ideal energy band position to approve charge transfer between the coterminous semiconductors, and promote photocatalytic oxidation and reduction reactions by accelerating the formation of strong oxidizing radicals (·OH, O 2 − , etc.).…”

Section: Introductionmentioning

confidence: 99%

Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight

Luo

et al. 2020

Nanomaterials

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The construction of heterostructured photocatalyst with an appropriate energy band structure will help realize highly efficient photo-excited charge separation. In this study, ternary CuO/CeO2/ZnO nano-particle (NP) composites were synthesized by a facile two-step sol-gel method, which exhibit significantly enhanced photocatalytic degradation performance for various organic pollutants under UV and visible light excitation. The photo-responses to both UV and visible light, as well as the visible light absorption and utilization rates of ZnO are found to be synergistically intensified by CeO2 and CuO co-coupling. The first-order kinetic constants (K) of 3%CuO/CeO2/ZnO for methylene blue (MB) degradation are ~3.9, ~4.1 and ~4.8 times higher than ZnO under UV light, visible light and simulated sunlight illumination, respectively. The roles of CuO and CeO2 in optical properties and photo-degradation under UV and visible light were explored. Besides, the photogenic holes (h+) of ZnO, CeO2, and the produced hydroxyl radicals (·OH) are proved to be the main active species under UV light. Dissimilarly, under visible light, the superoxide radicals (·O2−) formed by the reactions between oxygen molecules and the photo-generated electrons (e−) of CuO moving towards the catalysts surface are also found to be important for promoting dye decomposition. The improved photo-responses, the well-matched band structure that facilitates charge transfer processes, and the highly efficient utilization of the photo-excited carriers of the ternary nano-heterostructure are suggested to be the key factors for the remarkable enhancement of photocatalytic performance of ZnO nano-photocatalyst. This work offers a low-cost strategy to acquire highly active UV and visible light-driven photocatalyst.

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Section: Introductionmentioning

confidence: 99%

Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight

Luo

et al. 2020

Nanomaterials

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“…Magnetic photocatalytically active 1D composites structures have been reported by Wang et al [130] who synthesized titanium dioxide (TiO 2 ) nanotubes through electrochemical etching followed by insertion of oleic stabilized magnetite (Fe 3 O 4 ) nanoparticles (average size, <10 nm) which were converted to Fe 2 O 3 and incorporated into the structure. These nanocomposites demonstrated a strong magnetic response and were photocatalytically active under visible light.…”

Section: Metallic/metal Oxide/magnetic Nanoparticle-based Nanocompositesmentioning

confidence: 99%

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Govan

2020

Magnetochemistry

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Water resources are of extreme importance for both human society and the environment. However, human activity has increasingly resulted in the contamination of these resources with a wide range of materials that can prevent their use. Nanomaterials provide a possible means to reduce this contamination, but their removal from water after use may be difficult. The addition of a magnetic character to nanomaterials makes their retrieval after use much easier. The following review comprises a short survey of the most recent reports in this field. It comprises five sections, an introduction into the theme, reports on single magnetic nanoparticles, magnetic nanocomposites containing two of more nanomaterials, magnetic nanocomposites containing material of a biologic origin and finally, observations about the reported research with a view to future developments. This review should provide a snapshot of developments in what is a vibrant and fast-moving area of research.

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“…In fact, in the case of TiO 2 @Fe 2 O 3 , there remains a profound ambiguity as far as the electronic structure and its type is concerned. − One can find different models of the configuration of electronic bands that consequently predict various mechanisms of electron and hole separation . Research results in favor of the type I ,− and type II ,,− or that of the extended type I have been published. ,,, …”

Section: Introductionmentioning

confidence: 99%

Scavenger-Supported Photocatalytic Evidence of an Extended Type I Electronic Structure of the TiO₂@Fe₂O₃ Interface

Trenczek-Zając

Synowiec

Zakrzewska

et al. 2022

ACS Appl. Mater. Interfaces

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Heterostructures of TiO 2 @Fe 2 O 3 with a specific electronic structure and morphology enable us to control the interfacial charge transport necessary for their efficient photocatalytic performance. In spite of the extensive research, there still remains a profound ambiguity as far as the band alignment at the interface of TiO 2 @Fe 2 O 3 is concerned. In this work, the extended type I heterojunction between anatase TiO 2 nanocrystals and α-Fe 2 O 3 hematite nanograins is proposed. Experimental evidence supporting this conclusion is based on direct measurements such as optical spectroscopy, X-ray photoemission spectroscopy, scanning electron microscopy, high-resolution transmission electron microscopy (HRTEM), and the results of indirect studies of photocatalytic decomposition of rhodamine B (RhB) with selected scavengers of various active species of OH • , h • , e − , and • O 2 − . The presence of small 6−8 nm Fe 2 O 3 crystallites at the surface of TiO 2 has been confirmed in HRTEM images. Irregular 15−50 nm needle-like hematite grains could be observed in scanning electron micrographs. Substitutional incorporation of Fe 3+ ions into the TiO 2 crystal lattice is predicted by a 0.16% decrease in lattice parameter a and a 0.08% change of c, as well as by a shift of the Raman E g(1) peak from 143 cm −1 in pure TiO 2 to 149 cm −1 in Fe 2 O 3 -modified TiO 2 . Analysis of O 1s XPS spectra corroborates this conclusion, indicating the formation of oxygen vacancies at the surface of titanium(IV) oxide. The presence of the Fe 3+ impurity level in the forbidden band gap of TiO 2 is revealed by the 2.80 eV optical transition. The size effect is responsible for the absorption feature appearing at 2.48 eV. Increased photocatalytic activity within the visible range suggests that the electron transfer involves high energy levels of Fe 2 O 3 . Well-programed experiments with scavengers allow us to eliminate the less probable mechanisms of RhB photodecomposition and propose a band diagram of the TiO 2 @Fe 2 O 3 heterojunction.

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Aerobic Oil-Phase Cyclic Magnetic Adsorption to Synthesize 1D Fe2O3@TiO2 Nanotube Composites for Enhanced Visible-Light Photocatalytic Degradation

Cited by 17 publications

References 53 publications

Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight

Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Scavenger-Supported Photocatalytic Evidence of an Extended Type I Electronic Structure of the TiO₂@Fe₂O₃ Interface

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Aerobic Oil-Phase Cyclic Magnetic Adsorption to Synthesize 1D Fe2O3@TiO2 Nanotube Composites for Enhanced Visible-Light Photocatalytic Degradation

Cited by 17 publications

References 53 publications

Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight

Synthesizing CuO/CeO2/ZnO Ternary Nano-Photocatalyst with Highly Effective Utilization of Photo-Excited Carriers under Sunlight

Recent Advances in Magnetic Nanoparticles and Nanocomposites for the Remediation of Water Resources

Scavenger-Supported Photocatalytic Evidence of an Extended Type I Electronic Structure of the TiO2@Fe2O3 Interface

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Scavenger-Supported Photocatalytic Evidence of an Extended Type I Electronic Structure of the TiO₂@Fe₂O₃ Interface