scholarly journals Chitosan Membrane Embedded With ZnO/CuO Nanocomposites for the Photodegradation of Fast Green Dye Under Artificial and Solar Irradiation

2018 ◽  
Vol 13 ◽  
pp. 117739011876336 ◽  
Author(s):  
Eman Alzahrani
Keyword(s):  
Thin Film ◽  
Uv Light ◽  
Analytical Techniques ◽  
Light Irradiation ◽  
Solar Irradiation ◽  
Solar Light ◽  
Fast Green ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Animal Populations

Fast Green (FCF) dye is commonly used in both cytology and histology applications. Previous studies have found that it can cause mutagenic and tumorigenic effects in experimental human and animal populations. It can also be a source of skin, eye, respiratory, and digestive irritation. The purpose of this study was to examine the use of thin film membranes to degrade FCF. A thin film membrane of chitosan (CS) was fabricated and subsequently filled with zinc oxide nanoparticles (ZnO) or ZnO/CuO-heterostructured nanocomposites. The CS membrane was used as a matrix, and the nanomaterials were used as photocatalysts. The prepared membranes were characterised by four analytical techniques: atomic force microscopy, scanning electron microscopy, X-ray diffraction, and energy-dispersive X-ray analyses. The photocatalytic activity of the fabricated membranes was evaluated by performing experiments in which aqueous solutions of FCF dye that contained the fabricated membrane were irradiated with solar light or UV light. The photodegradation percentage was spectrophotometrically determined by monitoring the maximum wavelengths (λmax) of FCF at 623 nm for different irradiation times. The decolourisation percentages of the dye under solar light were 57.90% and 60.23% using the CS-ZnO and CS-ZnO/CuO membranes, respectively. When UV light irradiation was employed as the source of irradiation, the photodegradation percentages of FCF were 71.45% and 91.21% using the CS-ZnO and CS-ZnO/CuO membranes, respectively. These results indicated that the best photocatalytic system for the degradation of FCF dye was CS-ZnO/CuO membrane in combination with UV light irradiation. The study also found that it was easy to separate the prepared membranes after the reaction without the need for a centrifuge or magnet. The results demonstrate the potential for CS-ZnO and CS-ZnO/CuO membranes for use as effective sorbents during the process of photodegradation of harmful dyes within waste water recycling practices.

scholarly journals Degradation of Paracetamol by Photolysis Using C-N-codoped TiO2

Molekul ◽  
2017 ◽  
Vol 12 (2) ◽  
pp. 189
Author(s):  
Vanny Yulia Safitri ◽  
Adlis Santoni ◽  
Diana Vanda Wellia ◽  
Khoiriah Khoiriah ◽  
Safni Safni
Keyword(s):  
Water Pollution ◽  
Visible Light ◽  
Uv Light ◽  
Light Irradiation ◽  
Solar Light ◽  
Tio2 Catalyst ◽  
Codoped Tio2 ◽  
Uv Light Irradiation ◽  
Optimum Weight ◽  
Visible Light Degradation

Paracetamol is generally used as analgesic and antipyretic drugs. Contamination paracetamol in the environment can occur because of waste material disposal from production site and immediate disposal of household that cause water pollution. Paracetamol is degraded by photolysis method under irradiation 10 watt UV-light (λ=365 nm), visible-light (Philips LED 13 watt 1400 lux) and solar-light with and without addition C-N-codoped TiO2catalyst. The solution is analyzed by UV-Vis spectrophotometer at λ 200-400 nm. Optimum weight of C-N-codoped TiO2 catalyst obtained is 20 mg under UV-light photolysis. Paracetamol 4 mg/L is degraded 45.48% after 120 minutes under UV-light irradiation without catalyst, and increases to be 69.31% by using 20 mg catalyst. While degradation percentage of paracetamol is 16.96 % without catalyst, the percentage increases to be 34.29% after using 20 mg catalyst for 120 minutes photolysis under visible-light. Degradation of paracetamol by solar light achieves only 12.27% in absance of catalyst for 120 minutes irradiation, but it increases significantly until 70.39% in presence of 20 mg catalyst.

Self-Assembled Reduced Graphene Oxide-TiO2 Thin Film for the Enhanced Photocatalytic Reduction of Cr(VI) Under Simulated Solar Irradiation

2019 ◽  
Vol 19 (6) ◽  
pp. 3376-3387 ◽  
Author(s):  
Hongyuan Shang ◽  
Min Ma ◽  
Fasheng Liu ◽  
Zhe Miao ◽  
Aiping Zhang
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Visible Light ◽  
Reduced Graphene Oxide ◽  
Rate Constant ◽  
Solar Irradiation ◽  
Solar Light ◽  
X Ray ◽  
Simulated Solar Light ◽  
Reduced Graphene

In this study, reduced graphene oxide-TiO2 (RGO-TiO2) thin film was prepared by a simple self-assembly method at the gas/liquid interface. The as-prepared thin films were characterized by X-ray diffraction (XRD), Raman spectra, scanning electron microscopy (SEM), UV-visible-diffuse reflectance spectroscopy (UV-vis-DRS) and X-ray photoelectron spectroscopy (XPS). Photocatalytic activities of TiO2 and RGO-TiO2 thin film were investigated via the reduction of Cr(VI) under simulated solar light and visible light (λ > 420 nm) irradiation. The results showed that the RGO-TiO2 thin film exhibited remarkably enhanced activity for photoreduction of Cr(VI) under simulated sunlight or visible light irradiation, with a reaction rate constant of 5.7 times greater than that of pure TiO2 thin film. The main reason for enhanced photocatalytic activity is that introduction of RGO can restrain the recombination of photogenerated electron–hole pairs and reduce the aggregation of TiO2 NPs. The effects of different reaction parameters such as irradiation time, irradiation source, pH values, catalyst dosage and initial Cr(VI) concentration were investigated in detail. The highest photoreduction efficiency of Cr(VI) was achieved and the reduction rate constant k was 0.0189 min−1 during the reduction of 0.5 mg L−1 of Cr(VI) with 10 cm2 RGO-TiO2 thin film at pH 2.0 and 293 K. Moreover, different scavengers were also added in the photoreduction of Cr(VI) system to identify the reactive species. Based on the results of the present study, a possible mechanism of photoreduction on RGO-TiO2 thin film under simulated solar light was proposed. Overall, this study provides a novel approach to efficiently photoreduction of Cr(VI) by RGO-TiO2 thin film.

Coplanar homojunction a-InGaZnO thin film transistor fabricated using ultraviolet irradiation

RSC Advances ◽  
2015 ◽  
Vol 5 (101) ◽  
pp. 82947-82951 ◽  
Author(s):  
M.-M. Kim ◽  
M.-H. Kim ◽  
S.-m. Ryu ◽  
J. H. Lim ◽  
D.-K. Choi
Keyword(s):  
Thin Film ◽  
Ultraviolet Irradiation ◽  
Uv Light ◽  
Thin Film Transistor ◽  
Light Irradiation ◽  
Thermally Stable ◽  
Novel Technique ◽  
Uv Light Irradiation

A novel technique for formation of thermally-stable IGZO homojunction with highly conductivity by UV light irradiation.

scholarly journals Phase Transformation, Photocatalytic and Photoluminescent Properties of BiPO4 Catalysts Prepared by Solid-State Reaction: Degradation of Rhodamine B

Minerals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1007
Author(s):  
Abdessalam Bouddouch ◽  
Elhassan Amaterz ◽  
Bahcine Bakiz ◽  
Aziz Taoufyq ◽  
Frédéric Guinneton ◽  
...  
Keyword(s):  
Solid State ◽  
Rhodamine B ◽  
Solid State Reaction ◽  
Uv Light ◽  
Morphological Changes ◽  
Degradation Mechanism ◽  
Light Irradiation ◽  
Temperature Phase ◽  
X Ray ◽  
Uv Light Irradiation

Polycrystalline bismuth phosphate BiPO4 was synthesized by solid-state reaction at different temperatures varying from 500 to 900 °C. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and Raman spectroscopy. The low-temperature phase of BiPO4 has monoclinic structure with a space group P21/n, and was transformed into the monoclinic phase P21/m with a slight distortion of monoclinic lattice when it was heated above 500 °C. The effect of the transformation on the structure, morphology and photocatalytic properties was examined. The photocatalytic activity of each sample, in presence of Rhodamine B (RhB) in aqueous solution, was carried out and analyzed under UV light irradiation. Photoexperiments showed that the material prepared at 500 °C is the best catalyst with degradation efficiency of the order of 96% after 12 min of reaction time under UV light irradiation. This high photocatalytic efficiency could be due to their structural and morphological changes. The photocatalytic degradation mechanism of RhB in the presence of the best photocatalyst BiP-500 °C is proposed. The stability of the catalyst was also examined by carrying out four successive tests of the degradation in the presence of BiP-500 °C. Total organic carbon (TOC) was used to further estimate the rate of mineralization in the presence of BiP-500 °C (83% TOC removal). Photoluminescence experiments performed under UV-laser light irradiation revealed emissions in the green-orange range, with optimal intensities for the mix systems observed at 550 °C.

X-Ray and UV-Light Irradiation Effects on Oxide Superconducting Thin Films

1993 ◽  
Vol 137-139 ◽  
pp. 153-164
Author(s):  
Akira Enokihara ◽  
Shigemi Kohiki ◽  
Kentaro Setsune ◽  
Kiyotaka Wasa
Keyword(s):  
Thin Films ◽  
Uv Light ◽  
Light Irradiation ◽  
Superconducting Thin Films ◽  
Irradiation Effects ◽  
X Ray ◽  
Uv Light Irradiation

Electrical Property of TiO2 Thin Film Deposited by RF Sputtering

2007 ◽  
Vol 127 ◽  
pp. 221-226
Author(s):  
Kiyozumi Niizuma ◽  
Takahiro Hayakawa ◽  
Yoshio Utsushikawa
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Electrical Property ◽  
Tio2 Thin Film ◽  
Uv Light ◽  
Anatase Phase ◽  
Rf Sputtering ◽  
Light Irradiation ◽  
Tio2 Thin Films ◽  
Uv Light Irradiation

The authors investigated on the electrical property and the photo-catalytic activity of TiO2 thin films deposited in Ar+O2 atmosphere by RF magnetron sputtering. From the result of x-ray diffraction, the anatase phase was formed in TiO2 thin films. In TiO2 thin film deposited under a gas pressure of 3.0Pa, the contact angle of water showed 9 ﾟ, and the decomposition rate of Methylene Blue (measuring the absorbance of the reference light) showed -0.067 with UV light irradiation. Moreover, it revealed that the electric resistivity of TiO2 thin film deposited under the same conditions decreased from 8.0×103Ω･m to 1.4×10-2Ω･m with UV light irradiation.

Photocatalytic and Sonophotocatalytic Activity of Magnetic Heterogeneous Fe3O4/TiO2/CuO Catalyst

2016 ◽  
Vol 864 ◽  
pp. 128-133
Author(s):  
Ardiansyah Taufik ◽  
Shofianina Djalaluidin ◽  
Rosari Saleh
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Ultrasound Irradiation ◽  
Catalytic Performance ◽  
Light Irradiation ◽  
Molar Ratio ◽  
Ferromagnetic Behavior ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Result Show

Magnetic heterogeneous Fe3O4/TiO2/CuO catalyst were synthesized using sol-gel method. The molar ratio of Fe3O4/TiO2/CuO were varied from 1:1:0.1 until 1:1:5. The all synthesized catalyst were characterized using X-ray Diffraction (XRD), Energy Dispersive X-ray (EDX), Field Emission Scanning Electron Microscope (FE-SEM), and Vibrating Sample Magnetometer (VSM). The result show that the magnetic heterogeneous Fe3O4/TiO2/CuO catalyst exhibit ferromagnetic behavior under room temperature. The catalytic performance were evaluated on the degradation of methylene blue under UV light and combination of ultrasound and UV-light Irradiation. The combination of ultrasound and UV-light irradiation exhibit batter catalytic performance than ultrasound irradiation only. The Magnetic heterogeneous Fe3O4/TiO2/CuO with molar ratio 1:1:0.1 shows highest catalytic performance. The reusability of catalyst were also observed.

scholarly journals Preparation of TiO2/Activated Carbon Composites for Photocatalytic Degradation of RhB under UV Light Irradiation

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Baolin Xing ◽  
Changliang Shi ◽  
Chuanxiang Zhang ◽  
Guiyun Yi ◽  
Lunjian Chen ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Activated Carbon ◽  
Electron Microscope ◽  
Uv Light ◽  
Removal Rate ◽  
Sol Gel ◽  
Light Irradiation ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Loading Amount

Photocatalysts comprising nanosized TiO2particles on activated carbon (AC) were prepared by a sol-gel method. The TiO2/AC composites were characterized by X-ray diffraction (XRD), thermogravimetric (TG) analysis, nitrogen adsorption, scanning electron microscope (SEM), transmission electron microscope (TEM), and energy dispersive X-ray (EDX). Their photocatalytic activities were studied through the degradation of Rhodamine B (RhB) in photocatalytic reactor at room temperature under ultraviolet (UV) light irradiation and the effect of loading cycles of TiO2on the structural properties and photocatalytic activity of TiO2/AC composites was also investigated. The results indicate that the anatase TiO2particles with a crystal size of 10–20 nm can be deposited homogeneously on the AC surface under calcination at 500°C. The loading cycle plays an important role in controlling the loading amount of TiO2and morphological structure and photocatalytic activity of TiO2/AC composites. The porosity parameters of these composite photocatalysts such as specific surface area and total pore volume decrease whereas the loading amount of TiO2increases. The TiO2/AC composite synthesized at 2 loading cycles exhibits a high photocatalytic activity in terms of the loading amount of TiO2and as high as 93.2% removal rate for RhB from the 400 mL solution at initial concentration of 2 × 10−5 mol/L under UV light irradiation.

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