Photocatalytic Oxidation of Methyl Orange Dye over Titania Nanocatalyst

2012 ◽  
pp. 33-40
Author(s):  
Norzita Ngadi ◽  
Aisyah Nosri
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Light Source ◽  
Photocatalytic Oxidation ◽  
Uv Light ◽  
Light Condition ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Methyl Orange Dye ◽  
Dark Room

In this study, the ability of titania dioxide nanoparticles (TiO ) to remove methyl orange dye in aqueous solution was investigated. The effects of TiO dosage (i.e. 0.4, 0.8, 1.2, 1.6 and 2 g), pH (i.e. 4, 6, 7, 8, 10 and 12) temperature (30, 40 and 50°C) and light source (i.e. UV, sunlight and dark room) on the removal of methyl orange dye were studied. The experiments were conducted under the UV light irradiation with the presence of air bubbling. The samples were analyzed using UV-vis spectrophotometer at wavelength of 467 nm. From this study, it was found that the TiO dose, pH, temperature and the presence of light had a strong effect on the removal of dye. The removal of dye was optimum at TiO loading of 2.0 g, pH of 4, temperatureof 30°C and under UV light condition. Dalam kajian ini, kebolehupayaan titanium dioksida (TiO ) untuk menyingkirkan pewarna metil oren daripada larutan telah dikaji. Kesan-kesan dos TiO (iaitu 0.4, 0.8, 1.2, 1.6 and 2 g ), pH (iaitu 4,6,8,10 dan 12) suhu (iaitu 30, 40 and 50°C) dan sumber cahaya (UV, cahaya matahari dan bilik yang gelap) terhadap penyingkiran pewarna metil oren telah dikaji. Eksperimen telah dijalankan di bawah radiasi UV dengan kehadiran oksigen terlarut. Sampel telah dianalisa menggunakan UV-vis spektrofotometer dengan panjang gelombang 467 nm. Daripada kajian ini, telah didapati bahawa dos TiO , pH, suhu dan kehadiran cahaya memberikan kesan yang ketara terhadap penyingkiran pewarna. Penyingkiran pewarna adalah paling optimum pada dos TiO, 2 g, pH, 4, suhu, 30°C dan dibawah cahaya UV.

scholarly journals Photocatalytic oxidation of nitrite ion over carbon nitride

2018 ◽  
Vol 14 (1-2) ◽  
pp. 174-178 ◽  
Author(s):  
Siti Maryam Jasman ◽  
Hendrik Oktendy Lintang ◽  
Siew Ling Lee ◽  
Leny Yuliati
Keyword(s):  
High Performance ◽  
Photocatalytic Oxidation ◽  
Carbon Nitride ◽  
Uv Light ◽  
Nitrogen Adsorption ◽  
Thermal Polymerization ◽  
Light Irradiation ◽  
Polymerization Process ◽  
Nitrite Ion ◽  
Uv Light Irradiation

Nitrite ion (NO2-) is a toxic inorganic contaminant, which is widely used in industry and agriculture as a food preservative and a fertilizing agent. One of the methods to reduce the toxicity of the NO2- is by oxidizing it into less hazardous compounds, such as nitrate ion (NO3-). In this study, we demonstrated that a simple and green photocatalytic process can be employed to oxidize the NO2- to NO3- over a metal free-carbon nitride photocatalyst under ultraviolet (UV) light irradiation. The carbon nitride was synthesized via pyrolysis of urea precursor by a thermal polymerization process at 823 K for 4 hours. The prepared carbon nitride was then characterized by using X-ray diffractometer (XRD), field emission scanning electron microscope (FESEM), diffuse reflectance UV-visible (DR UV-vis), fluorescence, and Fourier transform infrared (FTIR) spectrophotometers, as well as nitrogen  adsorption-desorption isotherm analyzer. All the characterization results supported the successful synthesis of the carbon nitride. The carbon nitride was then used as the photocatalyst for oxidation of NO2- to NO3- under UV light irradiation for 3 h. The decrease of the NO2- and the formation of the NO3- were analyzed by using a high performance liquid chromatography (HPLC) equipped with Hypersil GoldTM PFP column. The mobile phase used was a mixture of methanol (MeOH) and water (H2O) with the ratio of MeOH:H2O was 30:70. The addition of orthophosphoric acid was required to set the pH at 2.5. The flow rate was fixed at 0.8 ml min-1 and the monitored wavelength was 220 nm. It was revealed that carbon nitride could oxidize NO2- to NO3- with a moderate conversion of 15%. Fluorescence quenching showed that there were good interactions between the emission sites of carbon nitride and the NO2- molecules. The good interactions would be one driving force for the carbon nitride to act as a good photocatalyst to oxidize the NO2- to NO3-. The oxidation pathway by the photogenerated species was also proposed.

Construction of ZnxCd1−xS/CeO2 composites for enhanced photocatalytic activity and stability by chemical precipitation method

2021 ◽  
pp. 2150334
Author(s):  
Yi-Feng Chai ◽  
Zhong-Hua Zhu ◽  
Ming-Wei Liu ◽  
Jing Zeng ◽  
Gui-Fang Huang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Chemical Precipitation ◽  
Charge Carriers ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Uv Light Irradiation

Development photoinduced photocatalysts is a significant approach to improve photocatalytic activity and stability. Herein, we successfully prepared Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites by a facile method. It is found that the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites show significant enhancement in photocatalytic activity for methyl orange (MO) degradation under visible and UV light irradiation. The degradation efficiency reaches up to 3.7 times higher than that of pure CeO2 under visible light irradiation. Moreover, the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples have almost no loss of photocatalytic activity after five recycles, indicating good photocatalytic stability of the samples. The attractive photocatalytic activity of the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples could be attributed to the robust charge carriers transfer and separation.

Preparation of a Novel Red Long Lasting Phosphorescent Material CaAl2Si2O8:Mn2+ and Investigation of its Luminescent Properties

2011 ◽  
Vol 71-78 ◽  
pp. 3151-3155 ◽  
Author(s):  
Bi Sang Chen ◽  
Zi Shan Zheng ◽  
Yan Mei Lin ◽  
Guo Liang Chen ◽  
Liang Zhou ◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Light Irradiation ◽  
Gel Method ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Phosphorescent Material ◽  
Fluorescence Spectrometer ◽  
Dark Room

A novel red long-lasting phosphor CaAl2Si2O8:Mn2+ was successfully synthesized by sol-gel method. X-ray diffractometer(XRD) and fluorescence spectrometer were used to characterize the structure and photoluminescence of the persistent phosphors, respectively. Under UV light irradiation, this phosphor showed obvious long-lasting phosphorescence that can be clearly seen with naked eyes in a dark room for 18 min after the irradiation source has been removed. Thermoluminescence measurement showed that the phosphor has an appropriate energy depth of 0.43 ev.

scholarly journals Auto-combustion Fabrication and Optical Properties of Zinc Oxide Nanoparticles for Degradation of Reactive Red 195 and Methyl Orange Dyes

2021 ◽  
Author(s):  
Ayman Awad Ali Abdelrazik ◽  
Ibrahim S. Ahmed ◽  
Alaa S. Amin ◽  
Mai M. Gneidy
Keyword(s):  
Zinc Oxide ◽  
Methyl Orange ◽  
Zinc Oxide Nanoparticles ◽  
Uv Light ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Oxide Nanoparticles ◽  
Uv Light Irradiation ◽  
Auto Combustion ◽  
Reactive Red 195

Abstract A new preparation method has been successfully utilized for the fabrication of zinc oxide nanoparticles using the auto-combustion method and fuels (tartaric acid: TA and citric acid: CA) with molar ratio (Zn:TA:CA=1:1:0, 1:0:0.55 and 1:0.5:0.275). The as-fabricated ZTA, ZCA and ZCTA samples annealed at 500 oC for two hours. The calcined zinc oxide nanoparticles were investigated by various tools such as XRD, DRS, FT-IR, and HR-TEM. The average crystallite size of the fabricated zinc oxide was determined to be 24-39 nm. The direct band gap, lattice parameters, unit cell volume (V), the dislocation density (D) and the Zn-O bond length (L) of the synthesized ZTA, ZCA and ZCTA samples were determined. The synthesized zinc oxide nanoparticles are used as nanocatalyst for photodegradation of reactive red 195 and methyl orange dyes under UV light irradiation. The degradation of reactive red 195 dye was 91-94 % after 70 min over the synthesized zinc oxide and the values of degradation increased to be 99-99.8 % in 50 min with H2O2 under UV light irradiation. Also, the degradation of methyl orange dye was 57.55-70.57 % after 300 min over the synthesized zinc oxide (ZTA, ZCA and ZCTA samples) and the values of degradation increased to be 81-95 % in 70 min with H2O2 under UV light irradiation. Finally, the appeared rate constant (Kapp) is determined and the mechanism of the photocatalysis process is suggested for the degradation of the dyes over the synthesized zinc oxide nanoparticles.

Immobilization of ZnO Suspension on Glass Substrate to Remove Filtration During the Removal of Remazol Red R from Aqueous Solution

2016 ◽  
Vol 12 (6) ◽  
pp. 4127-4133
Author(s):  
Nazmul Kayes ◽  
Jalil Miah ◽  
Md. Obaidullah ◽  
Akter Hossain ◽  
Mufazzal Hossain
Keyword(s):  
Aqueous Solution ◽  
Glass Substrate ◽  
Uv Light ◽  
Aqueous Suspension ◽  
Light Irradiation ◽  
Zno Films ◽  
Light Sources ◽  
Zno Film ◽  
Semiconductor Oxides ◽  
Remazol Red

Photodegradation of textile dyes in the presence of an aqueous suspension of semiconductor oxides has been of growing interest. Although this method of destruction of dyes is efficient, the main obstacle of applying this technique in the industry is the time and cost involving separation of oxides from an aqueous suspension. In this research, an attempted was made to develop ZnO films on a glass substrate by simple immobilization method for the adsorption and photodegradation of a typical dye, Remazol Red R (RRR) from aqueous solution. Adsorption and photodegradation of  RRR were performed in the presence of glass supported ZnO film. Photodegradation of the dye was carried out by varying different parameters such as the catalyst dosage, initial concentrations of RRR, and light sources. The percentage of adsorption as well as photodegradation increased with the amount of ZnO, reaches a maximum and then decreased. Maximum degradation has been found under solar light irradiation as compared to UV-light irradiation. Removal efficiency was also found to be influenced by the pre-sonication of ZnO suspension.

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