scholarly journals Photocatalytic Methylene Blue Degradation of Electrospun Ti–Zn Complex Oxide Nanofibers

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1311
Author(s):  
Wan-Tae Kim ◽  
Kyeong-Han Na ◽  
Dong-Cheol Park ◽  
Wan-Hee Yang ◽  
Won-Youl Choi
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Zinc Acetate Dihydrate ◽  
Complex Oxide ◽  
Electrospinning Process ◽  
Mixed Structure ◽  
Methylene Blue Degradation ◽  
Molar Ratios ◽  
Pollution Removal

Photocatalysts are the most important technology in air pollution removal and the detoxification of organic materials. Doping and complexation are among the most used methods to improve the efficiency of photocatalysts. Titanium dioxide and zinc oxide nanomaterials are widely used materials for photocatalysts and the degradation of toxic materials. Their mixed structure can be fabricated by many methods and the structure affects their properties. Nanofibers are efficient materials for photocatalysts due to their vertically formed structure, which improves the charge separation of photoelectrons. We fabricated them by an electrospinning process. A precursor consisting of titanium 4-isopropoxide, zinc acetate dihydrate and polyvinylpyrrolidone was used as a spinning solution for a mixed structure of titanium dioxide and zinc oxide with different molar ratios. They were then calcined, crystallized by heat treatment and analyzed by thermogravimetric-differential thermal analysis (TG-DTA), X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM) and energy-dispersive spectroscope (EDS). After annealing, the average diameters of the Ti–Zn complex oxide nanofibers were 237.6–278.6 nm with different salt ratios, and multiple crystalline structures were observed, namely TiO2, ZnO, ZnTiO3 and Zn2TiO4. We observed the photocatalytic performance of the samples and compared them according to the photodegradation of methylene blue. The methylene blue concentration decreased to 0.008–0.650 after three hours, compared to an initial concentration of 1, with different metal oxide structures.

Photodegradation of New Methylene Blue N in Aqueous Solution Using Zinc Oxide and Titanium Dioxide as Catalyst

2012 ◽  
Author(s):  
Rusmidah Ali ◽  
Boon Siew Ooi
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Zinc Oxide ◽  
Titanium Dioxide ◽  
Optimum Condition ◽  
Metal Ion ◽  
Optimum Ratio ◽  
Photodegradation Rate ◽  
Uv Visible ◽  
Uv Lamp

Dalam kajian ini, ZnO dan TiO2 digunakan sebagai fotomangkin dalam pendegradasian pewarna New Methylene Blue N (NMBN). Kadar fotodegradasi diukur menggunakan alat spektrofotometer UV-Vis. Dalam kajian ini, New Methylene Blue N menunjukkan nilai serapan pada λ = 590 nm dan λ = 286 nm. Lampu UV (λ = 354 nm) digunakan dalam proses fotodegradasi. Dalam proses degradasi menggunakan ZnO menunjukkan 81.42% NMBN terdegradasi pada λ = 590 nm dan 77.75% pada λ = 286 nm. Sebaliknya, degradasi menggunakan TiO2 adalah 25.68% pada λ = 590 nm dan 26.37% pada λ = 286 nm. Peratus degradasi New Methylene Blue N ialah 88.89% dan 68.94% pada masing-masing λ = 590 nm dan λ = 286 nm apabila ditambahkan dengan H2O2. Campuran ZnO dan TiO2 dalam nisbah 85: 15 (0.085 g; 0.015 g) merupakan campuran fotomangkin yang paling optimum iaitu dengan peratus degradasi NMBN sebanyak 96.97% dan 93.61% pada λ = 590 nm dan λ = 286 nm. Penambahan ion logam Cu2+ memberikan peratus degradasi tertinggi berbanding ion logam lain iaitu 83.83% pada λ = 590 nm. Penambahan ion logam Pb2+ memberikan peratus degradasi tertinggi pada λ = 286 nm iaitu 81.25% pewarna terdegradasi. Keadaan optimum dicapai pada pH 5.90, dengan peratus degradasi tertinggi iaitu 92.84% dan 89.30% pada masing-masing λ = 590 nm dan λ = 286 nm. Kata kunci: New Methylene Blue N; fotodegradasi; larutan; ZnO; TiO2 In this study, ZnO and TiO2 are used as photocatalyst to degrade the dye, New Methylene Blue N (NMBN). The photodegradation rate was measured using UV-Visible spectrophotometer. In this study, New Methylene Blue N showed absorption values at λ = 590 nm and λ = 286 nm. UV lamp (λ = 354 nm) is used in the photodegradation process. Results showed that ZnO is a better photocatalyst compared to TiO2. The degradation by ZnO showed that 81% of NMBN was degraded at λ = 590 nm and 77.75% at λ = 286 nm. In contratst, the degradation using TiO2 was 25.68% at λ = 590 nm and 26.37% at λ = 286 nm. The percent degradation of New Methylene Blue N is 88.89% and 68.94% at λ = 590 nm and λ = 286 nm respectively when H2O2 was added. A mixture of ZnO and TiO2 in the ratio of 85: 15 (0.085 g: 0.015 g) is the most optimum ratio for the mixed photocatalyst where the degradation percentage of NMBN are 96.97% and 93.61% at λ = 590 nm and λ = 286 nm. The addition of Cu2+ metal ion gave the highest percentage of degradation (83.83% at λ = 590 nm) compared to other metal ions. The addition of Pb2+ gave the highest percentage of degradation at λ = 286 nm with 81.25% degradation of the dye. The optimum condition was achieved at pH 5.90, which gave the highest percentage degradation, 92.84% and 89.30% at λ = 590 nm and λ = 286 nm respectively. Key words: New Methylene Blue N; photodegradation; aqueous; ZnO; TiO2

scholarly journals Facile synthesis of mesoporous titanium dioxide doped by Ag-coated graphene with enhanced visible-light photocatalytic performance for methylene blue degradation

RSC Advances ◽  
2017 ◽  
Vol 7 (41) ◽  
pp. 25314-25324 ◽  
Author(s):  
Lin Xiao ◽  
Li Youji ◽  
Chen Feitai ◽  
Xu Peng ◽  
Li Ming
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Solvothermal Method ◽  
Sol Gel ◽  
Facile Synthesis ◽  
Methylene Blue Degradation ◽  
Visible Light Driven ◽  
Visible Light Photocatalytic

A highly efficient and elaborately structured visible-light-driven catalyst composed of mesoporous TiO2 (MT) doped with Ag+-coated graphene (MT-Ag/GR) has been successfully fabricated by a sol–gel and solvothermal method.

Preparation of Graphene and γ-Fe2O3 Doped Titanium Dioxide and its Photocatalytic Properties

2013 ◽  
Vol 295-298 ◽  
pp. 447-451 ◽  
Author(s):  
De Qiang Chen ◽  
Yang Li ◽  
Yi Qun Chen
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Degradation Rate ◽  
Absorption Rate ◽  
Methylene Blue Degradation ◽  
Nano Powder ◽  
Doped Titanium Dioxide ◽  
Recycle Rate ◽  
Nano Titanium Dioxide

In this paper graphene is used to improve absorption rate of nano-titanium dioxide under visible light, meanwhile titanium dioxide is doped with superparamagnetism nano-powder of γ-Fe2O3 to modify the recovery of the photocatalyst. Gradually the increasing content of grapheme promotes the removal efficiency and correspondingly. Excitation condition is reduced and the photocatalysis property under visible light is improved and recycle rate of the titanium dioxide is effective promoted after the dispose. The effect of photocatalytic degradation of methylene blue is used to evaluate the photocatalytic activity. The methylene blue degradation rate raised from 53.4% to 85.9% with the increasing graphene load from 5% to 20% under visible light. The degradation efficiency of methylene blue decreased to 15% without the graphene load. The recovery rate of the photocatalyst can achieve 95% above. Graphene oxide works as the electron acceptor and photosensitizer to efficiently enhance the dye photodecomposition.

scholarly journals Synthesis of N-doped ZnO nanoparticles with cabbage morphology as a catalyst for the efficient photocatalytic degradation of methylene blue under UV and visible light

RSC Advances ◽  
2019 ◽  
Vol 9 (13) ◽  
pp. 7509-7535 ◽  
Author(s):  
Eswaran Prabakaran ◽  
Kriveshini Pillay
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Zno Nanoparticles ◽  
Zinc Oxide Nanoparticles ◽  
Zinc Acetate Dihydrate ◽  
Oxide Nanoparticles ◽  
Acetate Dihydrate ◽  
Hydrazine Monohydrate ◽  
Nitrogen Doped ◽  
Doped Zno

In this study, the synthesis of nitrogen-doped zinc oxide nanoparticles with a cabbage like morphology (N-ZnONCBs) by a hydrothermal method using zinc acetate dihydrate as a precursor and hydrazine monohydrate as a nitrogen source is reported.

Biosynthesized zinc oxide using Lycopersicon esculentum peel extract for methylene blue degradation

2017 ◽  
Vol 29 (5) ◽  
pp. 3722-3729 ◽  
Author(s):  
C. A. Soto-Robles ◽  
O. J. Nava ◽  
A. R. Vilchis-Nestor ◽  
A. Castro-Beltrán ◽  
C. M. Gómez-Gutiérrez ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Lycopersicon Esculentum ◽  
Methylene Blue Degradation ◽  
Peel Extract

scholarly journals Synthesis of TiO2/g-C3N4 material for visble light driven photocatalytic degradation of methylene blue

2020 ◽  
Vol 9 (3) ◽  
pp. 21-26
Author(s):  
Hoa Dang Thi Ngoc ◽  
Tu Nguyen Thi Thanh
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Diffuse Reflectance Spectroscopy ◽  
Pure Tio2 ◽  
X Ray Diffraction ◽  
Methylene Blue Degradation ◽  
Light Region ◽  
Visible Light Driven ◽  
Kinetics Of

In this study, an efficient strategy for the synthesis of solvent titanium dioxide and titanium dioxide/graphitic carbon nitride (TiO2/g-C3N4) heterostructure photocatalyst was applied to fabricate a kind of visible-light-driven photocatalyst. The obtained samples were  characterised  by  means of  X-ray diffraction, infrared spectroscopy, ultraviolet–visible spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy and photoluminescence. The heterostructure shows higher absorption edge towards harvesting more solar energy compared with pure TiO2 and pure g-C3N4 respectively. The  photocatalytic  behaviour  under  visible light  and  kinetics of  the TiO2/g-C3N4 catalyst via methylene blue degradation were addressed. The results showed that the introduction of solvent titanium dioxide  into g-C3N4 enhanced  the  photocatalytic activity in  the  visible  light region.  TiO2/g-C3N4 is  potential  visible  light  driven photocatalyst  for  the  organic substances degradation in aqueous solutions.

scholarly journals USE OF NANOSIZED CHROMIUM DOPED TiO2 SUPPORTED ON ZEOLITE FOR METHYLENE BLUE DEGRADATION

2010 ◽  
Vol 10 (1) ◽  
pp. 20-25 ◽  
Author(s):  
Aarti Ameta ◽  
Indu Bhati ◽  
Rakshit Ameta ◽  
Suresh C. Ameta
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Blue Dye ◽  
Photocatalytic Reaction ◽  
Methylene Blue Dye ◽  
X Ray Diffraction ◽  
Methylene Blue Degradation ◽  
X Ray

The photocatalytic degradation of methylene blue dye under visible light has been investigated using chromium modified titanium dioxide supported on zeolite (Cr-TiO2/zeolite). The photocatalyst was prepared by sol-gel method and characterized by X-ray diffraction and SEM. The rate of photodegradation of dye was monitored spectrophotometrically. The effect of pH, dye concentration, amount of photocatalyst and intensity of light on the rate of photocatalytic reaction was observed. The results showed that the use of Cr-doped TiO2 increased the rate of photocatalytic degradation of methylene blue as compared to untreated TiO2. The photocatalytic mechanism of Cr-TiO2 catalyst has been tentatively discussed.   Keywords: Methylene blue, zeolite, chromium, photocatalytic degradation

scholarly journals Synthesis of Silver Doped Titanium Dioxide by Wet-Ball Milling Sol–Gel Method for Antibacterial Application

2021 ◽  
Vol 333 ◽  
pp. 11002
Author(s):  
Tippabust Eksangsri ◽  
Chaweewan Sapcharoenkun ◽  
Siripond Phromma
Keyword(s):  
Methylene Blue ◽  
Particle Size ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Surface Area ◽  
Degradation Rate ◽  
Sol Gel ◽  
Methylene Blue Degradation ◽  
Doped Titanium Dioxide

Titanium dioxide (TiO2) has been extensively studied as photo-catalyst for water treatment, air purification and antibacterial applications due to its challenging properties such as chemical stability, environmental friendly and strong photocatalytic activity. However, the limitation of TiO2 on its dependent to ultraviolet radiation for photocatalytic activity is still aroused. In this study, silver doped titanium dioxide (Ag-TiO2) was synthesized by wet-ball milling sol–gel method (WBMS). Ag-TiO2 molar ratio was varied from 0% to 10% to study the effect of silver content on the synthesized Ag-TiO2 characteristics and the ability to apply on antibacterial applications. The objective of this work was to find an optimal concentration of Ag in Ag-TiO2. Characterization of the particle size, morphology, and surface area of synthesized Ag-TiO2 were discussed by techniques of transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET). Photocatalytic activity was investigated from degradation of methylene blue. Antibacterial activity was conducted by finding minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) tests performed on Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) under dark condition and under visible light. The results demonstrated that the doping of Ag inhibited crystal growth of Ag-TiO2. The smallest particle size and the highest surface area were obtained from 5% Ag-TiO2. Also, it was found that methylene blue degradation rate increased to the highest number of 1.62x10−3 min−1 when Ag concentration reached 5%, and methylene blue degradation rate reduced when Ag concentration was higher than 5%. The antibacterial activity of Ag-TiO2 was better than TiO2. The optimal concentration of 3-5% Ag-TiO2 was observed from the MIC and MBC tests.

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