Enhanced photocatalytic performance of NaNbO3 nanorods by loading Al2O3 nanoparticles

2020 ◽  
Vol 34 (30) ◽  
pp. 2050339
Author(s):  
Hetian Xia ◽  
Yu Zhao ◽  
Weili Li ◽  
Ruixuan Song ◽  
Yulei Zhang ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Electric Fields ◽  
Photocatalytic Performance ◽  
Hydrothermal Process ◽  
Photocurrent Density ◽  
Al2o3 Nanoparticles ◽  
Photocatalytic Efficiency ◽  
Photoelectrochemical Activity ◽  
Degradation Ratio ◽  
Facile Hydrothermal Process

Herein, we report the fabrication of UV-active NaNbO3/Al2O3 (30 wt.%) ferroelectric heterojunction photocatalyst with enhanced photoelectrochemical activity to Methylene Blue (MB). Pure NaNbO3 nanorods (NRs) were synthesized by a facile hydrothermal process and NaNbO3/Al2O3 composite was prepared by an ultrasonic vibration method. The heterostructures showed a remarkable increase in photocurrent density and the MB degradation ratio reached 88% in the initial 15 min and eventually reached 98.6% in 75 min. The high photocatalytic efficiency is attributed to the ferroelectric polarization of NaNbO3 with the forming of heterojunction electric fields assisted by Al2O3. These properties demonstrate that NaNbO3/Al2O3 ferroelectric heterojunction photocatalyst shows promising photoactivity and provides an effective method to improve the photocatalytic properties of other ferroelectrics.

scholarly journals Synthesis of Heterostructure of ZnO@MOF-46(Zn) to Improve the Photocatalytic Performance in Methylene Blue Degradation

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1379
Author(s):  
Jiraporn Buasakun ◽  
Phakinee Srilaoong ◽  
Ramida Rattanakam ◽  
Tanwawan Duangthongyou
Keyword(s):  
Methylene Blue ◽  
Band Gap ◽  
Photocatalytic Performance ◽  
Degradation Process ◽  
Band Gap Energy ◽  
Photocatalytic Efficiency ◽  
Electron Hole ◽  
Methylene Blue Degradation ◽  
Gap Energy ◽  
Hole Recombination

The heterostructure of ZnO and MOF-46(Zn) was synthesized to improve the photocatalytic performance of ZnO and prove the synergistic theory that presented the coexistence of ZnO and MOF-46(Zn), providing better efficiency than pure ZnO. The heterostructure material was synthesized by using prepared ZnO as a Zn2+ source, which was reacted with 2-aminoterephthalic acid (2-ATP) as a ligand to cover the surface of ZnO with MOF-46(Zn). The ZnO reactant materials were modified by pyrolysis of various morphologies of IRMOF-3 (Zn-MOF) prepared by using CTAB as a morphology controller. The octahedral ZnO obtained at 150 mg of CTAB shows better efficiency for photodegradation, with 85.79% within 3 h and a band gap energy of 3.11 eV. It acts as a starting material for synthesis of ZnO@MOF-46(Zn). The ZnO/MOF-46(Zn) composite was further used as a photocatalyst material in the dye (methylene blue: MB) degradation process, and the performance was compared with that of pure prepared ZnO. The results show that the photocatalytic efficiency with 61.20% in the MB degradation of the heterostructure is higher than that of pure ZnO within 60 min (90.09% within 180 min). The reason for this result may be that the coexistence of ZnO and MOF-46(Zn) can absorb a larger range of energy and reduce the possibility of the electron–hole recombination process.

scholarly journals Enhanced Photocatalytic Performance of CuFeO2-ZnO Heterostructures for Methylene Blue Degradation under Sunlight

2021 ◽  
Author(s):  
Preethi Sudarsan ◽  
Vivek Seethapathy ◽  
Priya Ranganathan ◽  
Balakumar S ◽  
Suresh Babu Krishnamoorthy
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Performance ◽  
Hydrothermal Process ◽  
Time Resolved ◽  
Raman Analysis ◽  
Methylene Blue Degradation ◽  
Weight Percentage ◽  
Band Alignments ◽  
P Type

Abstract Development of heterostructures is one of the constructive strategies for enhancing the photocatalytic activity. Here, novel CuFeO 2 -ZnO heterostructures with different weight percentage (CuFeO 2 = 0.5, 1, 5, 10%) were prepared by two-step precipitation-hydrothermal process. The structural confirmation was done by XRD and Raman analysis. The photocatalytic efficiency of the heterostructures was assessed by the degradation of methylene blue under sunlight. CuFeO 2 -ZnO heterostructures enhanced the photocatalytic performance compared to pure ZnO and CuFeO 2 . Among all, 5 wt % of CuFeO 2 on ZnO exhibited 100% degradation with 16 fold faster kinetics than ZnO. Time-resolved photoluminescent analysis revealed the increase in lifetime of charge carriers in the heterostructure. The band alignments of ZnO and CuFeO 2 , evaluated by Mott–Schottky revealed the existence of Type 1 heterostructures. Further, the heterostructures exhibited good recyclability. Thus, the present work demonstrates the use of p-type CuFeO 2 and n-type ZnO heterostructures as potential photocatalysts.

Synthesis of flower-like CuS/graphene aerogels for dye wastewater treatment

2019 ◽  
Vol 12 (02) ◽  
pp. 1950002 ◽  
Author(s):  
Tingwei Cai ◽  
Ying Ding ◽  
Lihui Xu
Keyword(s):  
Methylene Blue ◽  
Wastewater Treatment ◽  
Methyl Orange ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Dye Wastewater ◽  
Graphene Aerogels ◽  
Photoelectric Properties ◽  
Degradation Ratio ◽  
Dyes Degradation

A novel visible-light flower-like CuS/graphene aerogels (CuS/GAs) photocatalyst has been synthesized via two-step solvothermal method. The CuS/GAs show outstanding synergies of adsorption and photocatalysis for anionic–cationic dyes degradation, which is attributed to unique network structure and excellent photoelectric properties of GAs. The high degradation ratio of Methyl orange and Methylene blue by synergy are 92% and 99.36%, which are about 4.1 and 3.2 times of that for pure CuS. The flower-like CuS/graphene aerogels resolve the low adsorption saturation problem of GAs and improve the photocatalytic performance of CuS, indicating CuS/GAs could be a promising photocatalyst for wastewater treatment.

Morphology-controlled synthesis of SrTiO3/TiO2 heterostructures and their photocatalytic performance for water splitting

RSC Advances ◽  
2016 ◽  
Vol 6 (25) ◽  
pp. 21111-21118 ◽  
Author(s):  
Minh Ngoc Ha ◽  
Feng Zhu ◽  
Zhifu Liu ◽  
Lichao Wang ◽  
Linyan Liu ◽  
...  
Keyword(s):  
Water Splitting ◽  
Photocatalytic Performance ◽  
Hydrothermal Process ◽  
Controlled Synthesis ◽  
Facile Hydrothermal Process

Different morphologies of SrTiO3/TiO2 heterostructures like nanocubes, nanoparticles, nanospheres, and nanofibers were synthesized via a facile hydrothermal process, using TiO2 as both a template and precursor in Sr(OH)2 solution.

scholarly journals Formation and Photocatalytic Activity of BaTiO3Nanocubes via Hydrothermal Process

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Xinrun Xiong ◽  
Ruoming Tian ◽  
Xi Lin ◽  
Dewei Chu ◽  
Sean Li
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Photocatalytic Activity ◽  
Reaction Time ◽  
Hydrothermal Process ◽  
Photocatalytic Decomposition ◽  
Photocatalytic Reaction ◽  
Photocatalytic Efficiency ◽  
Methylene Orange ◽  
Hydrothermal Approach

We reported a facile hydrothermal approach to synthesize BaTiO3nanocubes with controlled sizes for degradation of methylene blue (MB). The nanocubes with reaction time of 48 hours exhibited the highest photocatalytic efficiency, owing to their narrower size distribution and better crystallinity compared to those of 24 hours and, at the meantime, smaller particle size than those of 72 hours. This work also demonstrated the degradation of methylene orange (MO) using BaTiO3nanocubes synthesized for 48 hours. Compared with the removal of MB, BaTiO3had lower photocatalytic activity on MO, mainly due to the poorer absorption behavior of MO on the surface of BaTiO3nanocubes. The degradation efficiency for each photocatalytic reaction was calculated. The possible mechanism of the photocatalytic decomposition on MB has been addressed as well.

Synthesis of Bi2MoO6/BiOI Composites for Visible Light Driven Photocatalytic Degradation of Methylene Blue

2021 ◽  
Vol 13 (4) ◽  
pp. 545-549
Author(s):  
You Zhang ◽  
Ning Xie ◽  
Lu Zhang ◽  
Fenghuang Wu ◽  
Zifei Xie ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Photocatalytic Efficiency ◽  
Photogenerated Electrons ◽  
Visible Light Driven ◽  
Photocatalytic Performances

Bi2MoO6/BiOI composites were synthesized by solvothermal method and photocatalytic performances were evaluated by degrading methylene blue (MB). Experiment results show that Bi2MoO6/0.5BiOI has the best photocatalytic efficiency for eliminating 92% MB in 2 h under the excitation of visible light. Such superior photocatalytic performance is due to the significantly enhanced ability to absorb visible light and separated efficiency of photogenerated electrons and holes.

Photocatalytic Performance of Plasma Sprayed TiO2-ZnFe2O4 Coatings

2005 ◽  
Vol 486-487 ◽  
pp. 69-72 ◽  
Author(s):  
Jun Tao Liu ◽  
Yi Zeng ◽  
Xiao Bing Zhao ◽  
Chuan Xian Ding
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Performance ◽  
Excited Electron ◽  
Ultraviolet Rays ◽  
Photocatalytic Efficiency ◽  
Electron Hole ◽  
Spraying Parameters ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

A novel TiO2−ZnFe2O4 coating was prepared by plasma spraying. The effects of spraying parameters and the composition of powders on the microstructure and surface morphology of plasma sprayed coatings are studied. The photocatalytic efficiency of the as-sprayed coatings was evaluated through the photo mineralization of methylene blue. It was found that TiO2 coatings can decompose methylene blue under the illumination of ultraviolet rays, and the degrading efficiency is improved with an increase in the content of FeTiO3 in the coatings. However, the presence of a large amount of ZnFe2O4 compound will substantially lower the photocatalytic efficiency of the TiO2−ZnFe2O4 coatings for the unfavorable photo-excited electron-hole transfer process.

Magnetic Composite Fe3O4/CuO/TiO2 Nanoparticles: Preparation, Characterization and Photocatalytic Activity

2015 ◽  
Vol 827 ◽  
pp. 13-18 ◽  
Author(s):  
Shofianina Jalaludin ◽  
Sarah A. Arifin ◽  
Rosari Saleh
Keyword(s):  
Methylene Blue ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Sol Gel ◽  
Cuo Nanoparticles ◽  
Composite Nanoparticles ◽  
Molar Ratio ◽  
Magnetic Composite ◽  
Photocatalytic Efficiency ◽  
Structure Morphology

Magnetic composite Fe3O4/TiO2/CuO nanoparticles have been synthesized by sol-gel method at low temperature. The resultant composite nanoparticles coupled with different Cu contained by adjusting the molar ratio of CuO to (Fe3O4/TiO2) from 1:1 – 5:1. The structure, morphology and properties of nanoparticles were characterized using XRD, EDX, FESEM and VSM. The results showed that all composite nanoparticles consist of cubic spinel Fe3O4, anatase TiO2 and monoclinic CuO, have ferromagnetic properties. The photocatalytic performance was evaluated using methylene blue in aqueous solutions under UV and visible light irradiation. Among the composite Fe3O4/TiO2/CuO nanoparticles, the sample with the molar ratio of CuO to (Fe3O4/TiO2) = 5 : 1 exhibited the highest photocatalytic efficiency. Photocatalytic mechanism was investigated by measuring the photocatalytic degradation rate in the presence of scavenger. The results suggested that holes play the most important role in degradation of methylene blue.

scholarly journals Decoration of TiO2/g-C3N4 Z-scheme by carbon dots as a novel photocatalyst with improved visible-light photocatalytic performance for the degradation of enrofloxacin

RSC Advances ◽  
2017 ◽  
Vol 7 (54) ◽  
pp. 34096-34103 ◽  
Author(s):  
Yuehan Su ◽  
Ping Chen ◽  
Fengliang Wang ◽  
Qianxin Zhang ◽  
Tiansheng Chen ◽  
...  
Keyword(s):  
Visible Light ◽  
Carbon Dots ◽  
Photocatalytic Performance ◽  
Hydrothermal Process ◽  
Characterization Methods ◽  
Visible Light Driven ◽  
Facile Hydrothermal Process ◽  
Visible Light Photocatalytic

A novel visible-light-driven CDs/TiO2/g-C3N4 photocatalyst was successfully synthesized by doping CDs in TiO2 nanoparticles and the surface of g-C3N4 nanosheets via a facile hydrothermal process and was confirmed by characterization methods.

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