scholarly journals Photocatalytic Degradation of Dyes by TiO2 Process in Batch Photoreactor

2020 ◽  
Vol 9 (4) ◽  
pp. 1502-1512
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Congo Red ◽  
Degradation Rate ◽  
Light Sources ◽  
Chemical Contamination ◽  
Degradation Of Dyes ◽  
Effective Option ◽  
Set Up

Chemical contamination in water caused by pollutants is becoming a severe environmental problem. The combination of photocatalysis and solar technologies are a valuable method for water pollution reduction caused by dyeing composites. Therefore, this study aims to determine the effects of operating parameters on the dyes photocatalytic degradation using titanium dioxide (TiO2)-based photocatalyst. Different types of dyes were used in this study, such as methylene blue, congo red, and methyl orange. The different weights of TiO2 were mixed respectively in 500 ml of 10 mg/L dye solutions, which was set up in the photoreactor priorly. Later, the sample extractions were carried and analyzed using a UV-Vis spectrophotometer. The dye removal efficiency was investigated by changing conditions (catalyst dosage, light sources, and aeration). The results showed methylene blue photocatalytic degradation was best with 0.0547 min-1 degradation rate at conditions of 3.0 g/L of TiO2, presence of UVC lamp, and aeration. Congo red photocatalytic degradation was best with 0.0254 min-1 degradation rate at conditions of 1.0 g/L of TiO2, presence of sunlight, and aeration. Methyl orange photocatalytic degradation was best with 0.0094 min-1 degradation rate using 1g/L of TiO2, presence of UVC lamp, and aeration. These findings can be used as an effective option in industrial wastewater treatment.

scholarly journals Synthesis and characterization of an α-Fe2O3/ZnTe heterostructure for photocatalytic degradation of Congo red, methyl orange and methylene blue

RSC Advances ◽  
2020 ◽  
Vol 10 (73) ◽  
pp. 44997-45007
Author(s):  
Rooha Khurram ◽  
Zhan Wang ◽  
Muhammad Fahad Ehsan ◽  
Song Peng ◽  
Maryam Shafiq ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Congo Red ◽  
Synthesis And Characterization ◽  
Electron Hole ◽  
Effective Generation ◽  
The Individual

Effective generation and transportation of electron–hole pairs in the presence of light leads to efficient degradation of textile pollutants over an α-Fe2O3/ZnTe nanocomposite compared to the individual components.

The Study on the Influential Factors of Photocatalytic Performance of Eosin-Sensitized TiO2 Nanoparticles

2013 ◽  
Vol 827 ◽  
pp. 3-7
Author(s):  
Shun Jiang He ◽  
Xue Yan Du ◽  
Qiao Wang ◽  
Jing Xu
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Influential Factors ◽  
Sunlight Irradiation ◽  
Sensitization Time

The photocatalytic activity of eosin-sensitized TiO2 nanoparticles on photocatalytic degradation rate (PDR) of methyl orange under sunlight irradiation was studied. The influential factors on the degradation, such as eosin concentration, TiO2 dosage, sensitization time and sensitization temperature were also investigated. The results show that: The performance of TiO2 nanoparticles for PDR of methyl orange has been improved obviously for eosin sensitizing. The PDR of methyl orange reached 45.28% under the conditions of eosin concentration of 20mg/L, TiO2 dosage of 0.5000g/L, sensitization time of 24h and sensitization temperature of 20°C.

scholarly journals Bioremediation of organic dyes using combination of plants ash

2019 ◽  
Vol 7 (2) ◽  
pp. 240-246
Author(s):  
Kaur Harpreet ◽  
Kaur Harpreet ◽  
Vandana Kamboj ◽  
Vandana Kamboj
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Methyl Orange ◽  
Crystal Violet ◽  
Congo Red ◽  
Organic Dyes ◽  
Low Cost ◽  
Sem Image ◽  
Orange Peels

Water is the most crucial thing to mankind and so its contamination by various agencies is posing a threat to the natural balance. So, in the present work, the efficiency of various adsorbents derived from plant waste, to remove different dyes from aqueous solution was evaluated. Parameters for study were contact time, concentration and pH. Various combinations of plant ashes were used for the study. It was found that adsorbent prepared from the combination of orange peels, pomegranate and banana peels ashes, exhibited good adsorption capacity for methylene blue, congo red and crystal violet. All these dyes were completely removed from the aqueous solution while methyl orange was not removed. Congo red was removed completely within 40 min of contact with the adsorbent while methyl orange took 3 hrs to be removed to the extent of 48% only. The adsorption coefficient of congo red was found to be 2.33 while value for methylene blue and crystal violet was 1 and 1.66 respectively. The characterization of adsorbent was done by Scanning Electron Microscopy and IR spectroscopy. SEM image revealed the surface of adsorbent to be made of differential pores. From the results it became evident that the low-cost adsorbent could be used as a replacement for costly traditional methods of removing colorants from water.

Photocatalytic degradation of methylene blue and methyl orange in a Zn(II)-based Metal–Organic Framework

2015 ◽  
Vol 57 (38) ◽  
pp. 17844-17851 ◽  
Author(s):  
Chong-Chen Wang ◽  
Yan-Qiu Zhang ◽  
Tian Zhu ◽  
Peng Wang ◽  
Shi-Jie Gao
Keyword(s):  
Methylene Blue ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Organic Framework

The Preparation of C, N, S Tri-Doped TiO2 and Visible-Light Photo-Degradation of Methylene Blue and Dyes

2011 ◽  
Vol 287-290 ◽  
pp. 1735-1743 ◽  
Author(s):  
Yi Dong Shi ◽  
Qiong Guo ◽  
Yuan Song Xie
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photoelectron Spectroscopy ◽  
Degradation Rate ◽  
Raw Material ◽  
Precipitation Method ◽  
Light Sources ◽  
Visible Absorption ◽  
Photo Degradation ◽  
X Ray

The C, N, S tri-doped TiO2 with high visible-light photo-catalysis effect was successfully prepared by mixing thiourea with the self-prepared TiO2 powder through calcining for 2h at 450°C. The TiO2 powder was obtained by homogeneous precipitation method using the metatitanic acid instead of expensive chemical reagents contained Ti as raw material. The effect of doping materials and methods on the photo-degradation rate of methylene blue and dyes was studied. The characterizations of the doped TiO2 were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-visible absorption spectra (UV-vis). The results showed that this sample was the anatase TiO2 and contained elements C, N, S. The sample exhibited a significant response to ultraviolet and visible light. In the photo-degradation experiment, the C, N, S, tridoped-TiO2 could decolorize methylene blue and textile dyes quickly, and the photo-degradation rate of methylene blue could reach upward 98% after 3 hours under the different light sources.

Research on the Photocatalytic Degradability of Methylene Blue Solution by Photocatalysis Bamboo Charcoal Fiber Knitted Fabric

2011 ◽  
Vol 332-334 ◽  
pp. 1040-1044 ◽  
Author(s):  
Qiu Mei Wang ◽  
Lei Tan ◽  
Rong Wen Zhou ◽  
Zhi Wei Zou ◽  
Xue Mei Xu
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Liquid Level ◽  
Knitted Fabric ◽  
Bamboo Charcoal ◽  
Methylene Blue Solution ◽  
Initial Concentration ◽  
Blue Solution ◽  
Degradation Effect

In this paper, the photocatalytic degradation of methylene blue solution by photocatalysis bamboo charcoal fiber knitted fabric was studied. The relationships were analyzed between the photocatalytic degradation rate and the reaction time, the initial concentration, pH of methylene blue solution, and the distance between the UV light centre and liquid level. The results indicates that there is an remarkable photocatalytic degradation effect of methylene blue solution by photocatalysis bamboo charcoal fiber knitted fabric under UV-irradiation, even the degradation rate could reach to 67.02%. The degradation effect was better with lower initial concentration of methylene blue solution, higher initial pH，and the shorter distance between light centre and liquid level.

Preparation and Characterization of La-B Co-Doped TiO2 Photocatalyst

2013 ◽  
Vol 859 ◽  
pp. 333-336
Author(s):  
Hai Chun Chen ◽  
Xiao Bei Pei
Keyword(s):  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
Pore Volume ◽  
Degradation Rate ◽  
Solvothermal Method ◽  
Tetrabutyl Titanate ◽  
Degradation Activity ◽  
Co Doped

La-B-TiO2photocatalysts were prepared using tetrabutyl titanate, tributyl borate, and lanthanum chloride as the precursors by solvothermal method. The prepared sample is composed of irregular particles with fairly rough surface in the size within 5 μm. Large surface area and pore volume are benefit to adsorption and photocatalytic degradation activity of the materials. Pore size of the 1%La-3%B-TiO2sample mainly distributes in the range between 5-35 nm. Specific surface area of the material is 101.45 m2/g. The sample containing 0.5% La presents the maximum decoloration efficiency. When La content is 0.5%, methyl orange adsorption rate on the material is less than 5%, and photocatalytic degradation rate is 39.9%.

scholarly journals Removal of methyl orange (MO) using carbon quantum dots (CQDs) derived from watermelon rinds

2019 ◽  
Vol 6 (1) ◽  
pp. 91-99
Author(s):  
Azrina Abd Aziz ◽  
U.R. Ramzilah
Keyword(s):  
Quantum Dots ◽  
Methyl Orange ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Carbon Quantum Dots ◽  
Facile Hydrothermal Method ◽  
X Ray ◽  
Degradation Activity ◽  
Scanning Electron

In this study, carbon quantum dots (CQDs) was prepared via a facile hydrothermal method. The objective for this study is to assess the performance of CQDs in photocatalytic degradation activity of methyl orange (MO) under artificial visible light source. For that reason, the prepared photocatalyst undergo further characterization by scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX) and UV- Vis spectrophotometer (UV-VIS) to verify the morphology structure of the photocatalyst, elemental composition as well as the absorbance intensity, respectively. The results indicates that the prepared photocatalyst possess irregular porous shape with nanometre (nm) dimensions that can escalate the surface area for photocatalytic degradation activity. The elements of the photocatalyst mainly consist of carbon and oxygen as the major constituents in which necessary for photocatalytic activity with intense peak of absorbance intensity. The prepared CQDs also shows an excellent photocatalytic performance over the MO with degradation rate of 68.9% within 120 minutes.

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