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.

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.

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%.

Carbon quantum dot-sensitized hollow TiO2 spheres for high-performance visible light photocatalysis

2021 ◽  
Author(s):  
Xianfeng Zhang ◽  
Zongqun Li ◽  
Shaowen Xu ◽  
Yaowen Ruan
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
High Performance ◽  
Carbon Quantum Dots ◽  
Visible Light Photocatalysis ◽  
Carbon Quantum Dot ◽  
Visible Light Photocatalytic

TiO2/CQD composites were synthesized through carbon quantum dots covalently attached to the surface of hollow TiO2 spheres for visible light photocatalytic degradation of organics.

Carbon quantum dots enhance the photocatalytic performance of BiVO4 with different exposed facets

2013 ◽  
Vol 42 (18) ◽  
pp. 6285 ◽  
Author(s):  
Di Tang ◽  
Hengchao Zhang ◽  
Hui Huang ◽  
Ruihua Liu ◽  
Yuzhi Han ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Performance ◽  
Carbon Quantum Dots ◽  
Exposed Facets

Synthesis of Visible-Light Responsive CdS/ZnO Nanocomposite Photocatalysts via Simple Precipitation Method

2014 ◽  
Vol 608 ◽  
pp. 224-229 ◽  
Author(s):  
Potjanaporn Chaengchawi ◽  
Karn Serivalsatit ◽  
Pornapa Sujaridworakun
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Photocatalytic Performance ◽  
Precipitation Method ◽  
Cds Nanoparticles ◽  
Methylene Blue Solution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Blue Solution ◽  
Scanning Electron

A visible-light responsive CdS/ZnO nanocomposite photocatalyst was successfully synthesized by precipitation of CdS nanoparticles, using Cd (NO3)2 and Na2S as starting materials, on ZnO nanoparticles and then calcined at 400°C for 2 hours. The effects of the mole ratio of CdS and ZnO in the composites on their phase, morphology, and surface area were investigated by X-ray Diffraction (XRD), scanning electron microscope (SEM), Brunauer Emmett Teller method (BET), respectively. The photocatalytic degradation of methylene blue solution in the presence of composite products under visible-light irradiation was investigated. The results showed that the mole ratio of CdS and ZnO played a significant role on photocatalytic performance. The highest photocatalytic activity was obtained from the CdS/ZnO nanocomposite with mole ratio of 1:4, which is higher than that of pure CdS and pure ZnO.

W-Doped TiO2 Preparation and Photocatalytic Degradation of Guaiacol

2014 ◽  
Vol 513-517 ◽  
pp. 33-36 ◽  
Author(s):  
Zi Chang Xie ◽  
Ying Wang ◽  
Peng Wang ◽  
Lei Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Photocatalytic Degradation ◽  
Degradation Rate ◽  
Amorphous State ◽  
X Ray Diffraction ◽  
Model Compounds ◽  
Plant Fibers ◽  
X Ray ◽  
Crystallite Structure

In this paper, W-doped TiO2 (W-TiO2) powder was prepared in hydrothermal method by mixing TiO2 and ammonium metatungstate. The catalysts were characterized by X-ray diffraction and ultraviolet spectrophotometer. The results displayed that W-TiO2 showed an anatase crystallite structure with 2 % W content. W-element in W-TiO2 was amorphous state. The guaiacol was degraded with the W-TiO2 in the visible light. It was a model compounds of lignin existed in the plant fibers. The degradation rate of guaiacol was increased with the photocatalytic time, as high as 88.21 % after 360 min irradiation. It was concluded that the W-TiO2 had an obvious photocatalytic activity under visible light. It can be used in the photocatalytic degradation of lignin.

Photocatalytic degradation of crystal violet dye using sulphur-doped carbon quantum dots

2021 ◽  
Author(s):  
Umairah Abd Rani ◽  
Law Yong Ng ◽  
Ching Yin Ng ◽  
Ebrahim Mahmoudi ◽  
Nur Hanis Hayati Hairom
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Degradation ◽  
Crystal Violet ◽  
Carbon Quantum Dots ◽  
Crystal Violet Dye

Enhanced photocatalytic degradation of Rhodamine B, antibacterial and antioxidant activities of green synthesised ZnO/N doped carbon quantum dots nanocomposites

2021 ◽  
Author(s):  
Aschalew Tadesse ◽  
Mebrahtu Hagos Kahsay ◽  
Neway Belachew ◽  
H C Ananda Murthy ◽  
Basavaiah Keloth
Keyword(s):  
Quantum Dots ◽  
Zinc Oxide ◽  
Photocatalytic Degradation ◽  
Rhodamine B ◽  
Environmental Remediation ◽  
Antioxidant Activities ◽  
Carbon Quantum Dots ◽  
Step Process ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

In order to explore an alternative photocatalyst for environmental remediation, we report the two-step process to synthesise the zinc oxide/nitrogen doped carbon quantum dots nanocomposites (ZnO@NCQDs NCs). In the first...

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