Effect of Dopant Concentration of N, Fe Co-Doped TiO2 on Photodegradation of Methylene Blue under Ordinary Visible Light

2014 ◽  
Vol 661 ◽  
pp. 34-38 ◽  
Author(s):  
Arman Sikirman ◽  
Jagannathan Krishnan ◽  
Elvana Nerissa Mohamad
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Physical Properties ◽  
Crystal Size ◽  
Dopant Concentration ◽  
Irradiation Time ◽  
Titanium Tetraisopropoxide ◽  
Solgel Method ◽  
High Dopant Concentration ◽  
Co Doped

The effect of dopant concentration on N, Fe co-doped TiO2 for photodegradation of methylene blue under ordinary visible light was investigated. The photocatalyst samples were prepared using solgel method with titanium tetraisopropoxide as precursor of titania. The dopant concentrations were varied from 0.50% and 1.0% and the calcinations temperature was fixed at 600oC. The prepared photocatalysts were characterized using XRD and FTIR to determine their physical properties. The results from XRD proved that photocatalyst with dopant concentration of 1.0% N, 1.0% Fe-TiO2 showing highly desirable properties in phase and crystal size. The results from FTIR revealed the presence of both the dopants in the samples. The effectivity of photocatalysts was tested by performing a standard batch photocatalytic degradation experiment with methylene blue as a model pollutant under ordinary visible light. The result showed that photocatalyst with high dopant concentration for both nitrogen and ferrum dopant (1.0 % N, 1.0% Fe-TiO2) yielded a maximum of 80.50% methylene blue degraded within five hours of irradiation time.

Synthesis, Characterization and Efficiency of N, C-TiO2 as an Active Visible Light Photocatalyst

2014 ◽  
Vol 661 ◽  
pp. 63-67
Author(s):  
Jagannathan Krishnan ◽  
Elvana Nerissa ◽  
Abdul Hadi
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Fine Particles ◽  
Dopant Concentration ◽  
Irradiation Time ◽  
Anatase Phase ◽  
Titanium Isopropoxide ◽  
Visible Light Photocatalyst ◽  
Solgel Method ◽  
Elemental Doping

Elemental doping of titanium dioxide with nitrogen and carbon were investigated in this study to get the modified photocatalyst working under visible light. Doped and codoped photocatalyst samples were synthesized by solgel method using titanium isopropoxide, ammonium nitrate and acetylacetone as precursors with the dopant concentration and calcination temperature fixed at 0.75% and 600°C respectively. Synthesized photocatalysts were characterized by XRD, FTIR and FESEM to check the existence of anatase phase, presence of dopants and formation of fine particles respectively. The effectiveness of the synthesized photocatalysts was measured by performing a standard batch photodegradation test with methylene blue as a model pollutant under ordinary visible light. The photocatalytic degradation efficiencies were found to be affected by the presence of dopant elements. The codoped photoctalyst (N-C-TiO2) exhibited the highest photocatalytic activity as it resulted in 91.3% degradation of methylene blue over 180 minutes of irradiation time.

Effect of Calcination Temperature of Carbon Doped TiO2 (C-TiO2) on Photocatalytic Activity under Visible Light

2014 ◽  
Vol 997 ◽  
pp. 292-296 ◽  
Author(s):  
Jagannathan Krishnan ◽  
Elvana Nerissa Mohamad ◽  
Arman Sikirman
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Calcination Temperature ◽  
Dopant Concentration ◽  
Irradiation Time ◽  
Titanium Isopropoxide ◽  
Carbon Doped ◽  
Photocatalytic Activities ◽  
The Relationship

Carbon doped TiO2 was prepared by solgel method using titanium isopropoxide and acetylacetone as the precursors for titanium and carbon respectively. Systematic studies on the calcination temperature and its impact on surface properties and photocatalytic activities under visible light was investigated. The dopant concentration was fixed at 0.75% and the calcinations temperature was varied from 450 to 750oC.The prepared photocatalysts were characterized by XRD, UV-Vis DRS and FESEM in order to understand the relationship between the properties and its photocatalytic activities. The photocatalytic activity was measured by carrying out a standard photodegradation test under domestic illumination lamp with methylene blue as the model pollutant. With three hours of irradiation time, 69.7% of methylene blue was removed by C-TiO2 which was calcined at an optimum temperature of 600°C.

scholarly journals Synthesis and Photoactivity of Fe3O4/TiO2-Co as a Magnetically Separable Visible Light Responsive Photocatalyst

2018 ◽  
Vol 18 (3) ◽  
pp. 403 ◽  
Author(s):  
Eko Sri Kunarti ◽  
Indriana Kartini ◽  
Akhmad Syoufian ◽  
Karolina Martha Widyandari
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Dopant Concentration ◽  
Band Gap Energy ◽  
Methylene Blue Solution ◽  
Magnetic Photocatalyst ◽  
Blue Solution ◽  
Degradation Reaction ◽  
Visible Irradiation ◽  
Uv Visible

Synthesis of magnetic photocatalyst, Fe3O4/TiO2-Co, with characterization and photoactivity examination have been conducted. The synthesis was initiated by preparation of Fe3O4 particles using coprecipitation method. The Fe3O4 particles were then coated with TiO2-Co at a various ratio of Fe3O4:TiO2 and concentration of Co(II) dopant. The Fe3O4/TiO2-Co was characterized by FTIR, XRD, TEM, SEM-EDX, VSM, and SR UV-visible methods. Photoactivity of the Fe3O4/TiO2-Co was carried out using methylene blue as a target molecule in degradation reaction within a batch system. By using optimum conditions, the degradation of methylene blue solution was performed under exposure to UV, visible light and dark condition. Results showed that the Fe3O4/TiO2-Co formation was confirmed by the presence of Fe3O4 and anatase diffraction peaks in the X-ray diffractogram. SR UV-Vis spectra indicated that the Fe3O4/TiO2-Co was responsive to visible light. Band gap energy of the Fe3O4/TiO2-Co with dopant concentration of 1; 5; 10 and 15% were 3.22; 3.12; 3.09 and 2.81 eV, respectively. The methylene blue solution can be well photodegraded at a pH of 10 for 210 min. The Fe3O4/TiO2-Co has the highest ability to methylene blue photodegradation with dopant concentration of 10% gave degradation yield of 80.51 and 95.38% under UV and visible irradiation, respectively.

PHOTOCATALYTIC ACTIVITY OF NITROGEN AND FLUORINE CO-DOPED TITANIUM DIOXIDE PREPARED USING OF VARIOUS PH SOLUTIONS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3242-3247 ◽  
Author(s):  
MASAHIRO KATOH ◽  
AKIHIRO IMAYAMA ◽  
NARISUKE MORI ◽  
TOSHIHIDE HORIKAWA ◽  
TAHEI TOMIDA
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Uv Light ◽  
Anatase Phase ◽  
Wave Length ◽  
Green Light ◽  
Light Irradiation ◽  
Mixed Solution ◽  
Co Doped

Introducing different atoms into TiO 2 crystal lattice is a famous method to improve photocatalytic activity of TiO 2 under visible-light irradiation. In this paper, Nitrogen ( N ) and fluorine ( F ) co -doped TiO 2 powders were prepared by mixing TiCl 3 solutions with ammonium fluoride ( NH 4 F ). In preparation, we used NH 3- H 2 O solution for adjustment of pH values (pH 2, 7, and 9) of mixed solution. X-ray diffraction (XRD) indicated N , F - TiO 2 powders prepared at pH7 and pH9 contained only anatase phase, but the powders prepared at pH2 contained both anatase and rutile phase. The result of XRD also indicated N , F - TiO 2 powders prepared at pH7 had the smallest crystallite size. We measured photocatalytic activity of prepared N , F - TiO 2 powders by the decomposition of methylene blue. N , F - TiO 2 powder prepared at pH7 and pH9 showed same high photocatalytic activity under ultraviolet light irradiation (peak wave length = 352 nm). Furthermore, under green light LED irradiation (wave length = 525 nm), a sample prepared at pH7 decomposed methylene blue more quickly than any other samples. As the result, N , F - TiO 2 prepared at pH7 had the best catalytic activity under both UV-light and visible light in the all of N , F - TiO 2 prepared and reference TiO 2 photocatalyst (ST-01 produced by Ishihara Co. Ltd).

Preparation, Characterization and Effectivity of N, Fe-TiO2 as a Visible Light Active Photocatalyst

2014 ◽  
Vol 894 ◽  
pp. 245-249 ◽  
Author(s):  
Arman Sikirman ◽  
Jagannathan Krishnan ◽  
Junaidah Jai ◽  
Senusi Faraziehan
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Fine Particles ◽  
Irradiation Time ◽  
Anatase Phase ◽  
Titanium Isopropoxide ◽  
Ferric Nitrate ◽  
Co Doping ◽  
Sem Image

Surface modification of the titanium dioxide by doping and co-doping with nitrogen and iron in order to make the photocatalyst active under visible light was investigated. Solgel method was adapted for the preparation of surface modified titanium dioxide, where tetra titanium isopropoxide, ammonium nitrate and ferric nitrate were used as precursors while maintaining the dopant concentration and calcination temperature at 0.75% and 600°C, respectively. The prepared photocatalyst samples were characterized by XRD, FE-SEM and FTIR in order to study their physical properties. The results from XRD confirmed that all prepared photocatalyst were of anatase phase. FE-SEM image analysis revealed the formation of fine particles and the FTIR analysis verified the presence of dopants. The effectivity of photocatalysts was tested by performing a standard batch photocatalytic degradation experiment with methylene blue as a model pollutant under visible light. The result showed that co-doped photocatalyst (0.75% N, 075% Fe-TiO2-600) yielded a maximum of 76% methylene blue degraded within three hours of irradiation time.

scholarly journals Effect of Oxalic Acid Leaching on Photocatalytic Activity of Natural Sphalerite

2020 ◽  
Author(s):  
Chukwunonso Onyenanu ◽  
Lovet Emembolu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Irradiation Time ◽  
Acid Leaching ◽  
Blue Dye ◽  
Light Illumination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Visible Light Illumination

Abstract Photocatalytic activity of the natural semiconducting sphalerite mineral from Abuni, Nasarawa State, Nigeria was studied for the degradation of methylene blue (MB). Natural Sphalerite as a visible – light responsive photocatalyst was characterized by X ray diffraction (XRD), X ray fluorescence (XRF) and surface area analysis. To further enhance the photocatalytic activity of natural Sphalerite, the chemical composition of the sphalerite was varied via leaching with oxalic acids. The photocatalytic activity of the Natural sphalerite, leached sphalerite and as well as the calcined leachates was tested for MB degradation under visible light illumination. The result shows a very high percentage of MB degradation by natural sphalerite after 60mintues of light irradiation time. A composite of ZnO -α –Fe2O3 -ϒ-Fe2O3 with traces amount of MoO and MnO2 was synthesized by calcination of the obtained leachates at 1000°C for 4hours. The photocatalytic degradation of methylene blue dye follows pseudo first order kinetics.

Synthesis of CoO-ZnO photocatalyst for enhanced visible-light assisted photodegradation of methylene blue

2022 ◽  
Author(s):  
Muhammad Saeed ◽  
Iltaf Khan ◽  
Muhammad Adeel ◽  
Nadia Akram ◽  
Majid Muneer
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Aqueous Phase ◽  
Organic Pollutants ◽  
Precipitation Method ◽  
Doped Zno ◽  
Co Doped

The synthesis of efficient photocatalysts for visible light-assisted photodegradation of aqueous phase organic pollutants has received significant consideration recently. In this research, Co-doped ZnO is synthesized by precipitation method for...

PHOTOCATALYTIC AND ANTIBACTERIAL ACTIVITY OF TITANIUM, FLUORINE AND SILVER CO-SUBSTITUTED HYDROXYAPATITE

2013 ◽  
Vol 22 ◽  
pp. 268-277 ◽  
Author(s):  
M. SANDHYARANI ◽  
N. RAMESHBABU ◽  
K. VENKATESWARLU ◽  
K. V. RAVISANKAR ◽  
M. ASHOK ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Heat Treatment ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Crystal Size ◽  
Potential Candidate ◽  
Visible Light Photocatalytic Activity ◽  
Heat Treated Condition ◽  
Visible Light Photocatalytic

Synthetic hydroxyapatite (HA), an analogue of the mineral component of bone tissue has been widely used in medicine as bone replacing material. To impart specific properties, HA can be chemically modified by anionic and cationic substitutions during synthesis. Thus the present study was focused in synthesizing nanocrystalline Ti , Ag and F co-substituted HA by microwave synthesis. The prepared powders were characterized by XRD and FTIR for their crystal size, cystallinity and functional groups respectively. XRD spectra reveal that crystal size of prepared powders was in the range of 21–25 nm in as synthesized condition and 45–51 nm in 900 ˚C heat-treated condition. Complete decomposition of HA to tri calcium phosphate was observed for Ti substituted HA powder after heat-treatment. Addition of F improved the thermal stability of Ti substituted HA as indicated by predominant phase of HA after heat-treatment. The photocatalytic activity of co-substituted HA powders was examined by degradation of methylene blue (5 × 10−5 M concentration) under visible light irradiation and the results were compared with pure HA . The degradation efficiency of co-substituted HA with respect to methylene blue was twice as high as that of pure HA. Ti and Ag has improved the visible light photocatalytic activity of HA, further F co-substitution has not affected the photocatalytic activity of substituted HA. The antibacterial effect of prepared powders was observed against 1 × 105 cells/mL of Escherichia coli using spread plate method at 24 h incubation period. Ag co-substituted HA showed complete inhibition of growth of Escherichia coli. Thus, among Ti , Ti-F , Ti-F-Ag substituted HA powders, Ti-F-Ag co-substituted HA with excellent visible light photocatalytic activity and anti-bacterial property is expected to be a potential candidate for biomedical applications.

scholarly journals PENGARUH PENAMBAHAN CO-DOPING Mg/La TERHADAP KARAKTERISASI TiO2 SEBAGAI FOTOELEKTRODA

2021 ◽  
Vol 9 (1) ◽  
pp. 79-86
Author(s):  
Mursal Mursal ◽  
◽  
Nurul Azmi ◽  
Ismail Ismail ◽  
◽  
...  
Keyword(s):  
Doping Concentration ◽  
Crystal Size ◽  
Energy Gap ◽  
Dopant Concentration ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Tio2 Sample ◽  
Doped Tio2 ◽  
Co Doping ◽  
Co Doped

The effect of Mg/La co-doping addition on the caracteristics of TiO2 as photoelectrode have been studied. This study aims to investigate the effect of Mg/La co-doping concentration on the characteristics of TiO2. This study aims investigate the effect of Mg/La co-doping concentration on the characteristics of TiO2. Mg/La was varied from 0% mol, 0.4 / 0.6% mol, and 0.6 / 0.4% mol. Synthesis of TiO2 co-doping Mg/La was done by sol gel method. The resulting of powder pure TiO2 and co-doping Mg/La was made to paste, and was deposited on a glass substrate with a size of 2.5 x 2.5 cm and sintered at 600°C for 1 hour. Mg / La co-doped TiO2 layers were characterized using XRD, UV-Vis, and FTIR spectrometers. The results showed that TiO2 was the mos dominan phase appeared in pure TiO2 sample. The phase of MgO, MgTiO3, Mg2TiO4, and La2O3 were found in Mg/La co-doped TiO2 samples. The crystal size of Mg/La co-doped TiO2 was varied from 8.85 to 7.70 nm. In this research, we obtained that the energy gap was varied from 3.52 to 3.5 eV depent on co-dopant concentration. FTIR measurement showed groups of Ti-O, Ti-O-Ti, Ti-O-O, and H-O.

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