Initial Degradation Rate ofp-Nitrophenol in Aqueous Solution by Fenton Reaction

2008 ◽  
Vol 47 (22) ◽  
pp. 8533-8541 ◽  
Author(s):  
Meng-Wen Chang ◽  
Tai-Shang Chen ◽  
Jia-Ming Chern
Keyword(s):  
Aqueous Solution ◽  
Fenton Reaction ◽  
Degradation Rate ◽  
Initial Degradation Rate

scholarly journals Photocatalytic Degradation of Tetracycline in Aqueous Solution Using Copper Sulfide Nanoparticles

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1238
Author(s):  
Murendeni P. Ravele ◽  
Opeyemi A. Oyewo ◽  
Sam Ramaila ◽  
Lydia Mavuru ◽  
Damian C. Onwudiwe
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Copper Sulfide ◽  
Degradation Rate ◽  
Light Exposure ◽  
Reaction System ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Pure Phase

In this paper, spherical-shaped pure phase djurleite (Cu31S16) and roxbyite (Cu7S4) nanoparticles were prepared by a solvothermal decomposition of copper(II) dithiocarbamate complex in dodecanthiol (DDT). The reaction temperature was used to control the phases of the samples, which were represented as Cu31S16 (120 °C), Cu31S16 (150 °C), Cu7S4 (220 °C), and Cu7S4 (250 °C) and were characterized by using X-ray diffraction (XRD), scanning and transmission electron microscopy (SEM and TEM), and absorption spectroscopy. The samples were used as photocatalysts for the degradation of tetracycline (TC) under visible light irradiation. The results of the study showed that Cu7S4 (250 °C) exhibited the best activity in the reaction system with the TC degradation rate of up to 99% within 120 min of light exposure, while the Cu31S16 (120 °C) system was only 46.5% at the same reaction condition. In general, roxbyite Cu7S4 (250 °C) could be considered as a potential catalyst for the degradation of TC in solution.

scholarly journals The Effect of Ultrasound, Oxygen and Sunlight on the Stability of (−)-Epigallocatechin Gallate

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2394 ◽  
Author(s):  
Jiajun Zeng ◽  
Huanhua Xu ◽  
Yu Cai ◽  
Yan Xuan ◽  
Jia Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
High Performance ◽  
Room Temperature ◽  
Degradation Rate ◽  
Epigallocatechin Gallate ◽  
Important Conclusion ◽  
Beneficial Effects ◽  
Periodontal Infection ◽  
The Stability ◽  
Ultrasonic Conditions

(−)-Epigallocatechin gallate (EGCG), is the main catechin found in green tea, and has several beneficial effects. This study investigated the stability of EGCG aqueous solution under different stored and ultrasonic conditions to determine whether it can be used with an ultrasonic dental scaler to treat periodontal infection. Four concentrations (0.05, 0.1, 0.15, 2 mg/mL) of EGCG aqueous solution were prepared and stored under four different conditions (A: Exposed to neither sunlight nor air, B: Exposed to sunlight, but not air, C: Not exposed to sunlight, but air, D: Exposed to sunlight and air) for two days. The degradation rate of EGCG was measured by high performance liquid chromatography (HPLC). On the other hand, an ultrasonic dental scaler was used to atomize the EGCG solution under four different conditions (a: Exposed to neither air nor sunlight, b: Not exposed to air, but sunlight, c: Not exposed to sunlight, but air, d: Exposed to air and sunlight), the degradation of EGCG was measured by HPLC. We found that the stability of EGCG was concentration-dependent in water at room temperature. Both sunlight and oxygen influenced the stability of EGCG, and oxygen had a more pronounced effect on stability of EGCG than sunlight. The most important conclusion was that the ultrasound may accelerate the degradation of EGCG due to the presence of oxygen and sunlight, but not because of the ultrasonic vibration. Thus, EGCG aqueous solution has the potential to be used through an ultrasonic dental scaler to treat periodontal infection in the future.

scholarly journals Preparation of Fe3+ Doped High-Ordered TiO2 Nanotubes Arrays with Visible Photocatalytic Activities

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2107
Author(s):  
Jin Zhang ◽  
Chen Yang ◽  
Shijie Li ◽  
Yingxue Xi ◽  
Changlong Cai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Visible Light ◽  
Tio2 Nanotubes ◽  
Degradation Rate ◽  
Rutile Phase ◽  
Visible Light Range ◽  
Crystallization Method ◽  
Photocatalytic Activities ◽  
Tio2 Ntas ◽  
Temperature Water

In this paper, the Fe3+ doped rutile phase TiO2 nanotubes arrays (NTAs) were prepared in a low temperature water-assistant crystallization method. It is noteworthy that the Fe3+ doping hardly hinders either the crystallization of rutile TiO2 NTAs or the highly-ordered nanotubular morphologies. Moreover, Fe3+ did not form other compound impurities, which indicated that Fe3+ substitute Ti4+ into the lattice of TiO2. With the introduction of Fe3+, the light absorption range of TiO2 NTAs extends from the ultraviolet band to the visible light range. Photocatalytic testing results indicate that Fe3+ doped TiO2 NTAs can effectively improve the degradation rate of methyl orange aqueous solution in visible light, and the TiO2 NTAs with 0.2 mol/L Fe3+ doping exhibits the highest photocatalytic degradation efficiency.

scholarly journals Effect of thermal treatment on the catalytic activity of a Fe-rich bentonite for the photo-Fenton reaction

Cerâmica ◽  
2019 ◽  
Vol 65 (373) ◽  
pp. 147-152 ◽  
Author(s):  
B. M. Zimmermann ◽  
S. Silvestri ◽  
J. Leichtweis ◽  
G. L. Dotto ◽  
E. S. Mallmann ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rhodamine B ◽  
Fenton Reaction ◽  
Dye Degradation ◽  
Mesoporous Structure ◽  
Iron Leaching ◽  
Visible Irradiation ◽  
Reaction Cycles ◽  
Adsorption Desorption ◽  
Thermally Treated

Abstract The objective of this work was to evaluate the degradation of rhodamine B dye from aqueous solution by photo-Fenton reaction under visible irradiation using a Fe-rich bentonite as a catalyst. The material was thermally treated at a low temperature (200 °C) and characterized by XRD, N2 adsorption-desorption isotherms, FTIR, SEM-EDS and XRF. Iron leaching in aqueous solution after the photo-Fenton reaction was evaluated by atomic absorption spectroscopy. The material exhibited a mesoporous structure, containing a specific surface area of 99 m2.g-1. The catalytic results showed significant dye degradation, reaching 95% of decolorization and 72% of mineralization at 300 min of reaction. The catalyst showed high chemical stability in four reaction cycles. Therefore, this thermally treated Fe-rich bentonite can be considered as a promising catalyst in the heterogeneous photo-Fenton reaction for the degradation of rhodamine B from aqueous solution.

Synthesis and Recycle of ZnO Particles for Degradation of Methyl Orange Aqueous Solution

2011 ◽  
Vol 121-126 ◽  
pp. 587-591 ◽  
Author(s):  
Li Qin Wang ◽  
Xiang Ni Yang ◽  
Xiu Li Zhao ◽  
Yang Han ◽  
Rui Jun Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Lamellar Structure ◽  
Degradation Rate ◽  
Mesoporous Structure ◽  
High Photocatalytic Activity ◽  
Type Iv ◽  
Zno Particles ◽  
Adsorption Desorption

The ZnO particles with mesoporous and lamellar structure were synthesized in the method of precipitation, using zinc acetate as precursor. The ZnO particles were characterized by the means of scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and N2 adsorption–desorption measurements. The photoactivity of as-prepared ZnO particles was evaluated by degradation experiment of methyl orange aqueous solution. The results showed the obtained ZnO particles were irregular polygons with lamellar structure, and the particle size was in the range of 50 nm to 300 nm. According to XRD and N2 absorption results, ZnO particles were pure and integrated crystals with high crystallinity, and adsorption-desorption isotherms correspond to the typical type IV isotherm with a hysteresis loop of type H3, which showed ZnO particles had mesoporous structure with slit pore shape. The ZnO particles had high photocatalytic activity, the maximum degradation rate of methyl orange aqueous solution can reach 99%. When reused for the fifth time, the photocatalytic activity of ZnO particles was similar with the fresh ones, and recycled for the tenth time, the degradation rate of methyl orange aqueous solution still standed by 84.7%.

The Influence of Yb3+/Er3+ Co-Doped β-NaYF4 Up-Conversion Micron Tubes on Photocatalytic Activity of TiO2 for Degradation of Organic Dyes

2015 ◽  
Vol 1118 ◽  
pp. 211-216
Author(s):  
Yuan Liang Ma ◽  
Xue Rong Zheng ◽  
Wei Liu ◽  
Hai Qin Li ◽  
Hui Ming Ji
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Degradation Rate ◽  
Organic Dyes ◽  
Photocatalytic Efficiency ◽  
Simulated Sunlight ◽  
Combination Methods ◽  
Photocatalytic Activities ◽  
Pure Phase ◽  
Co Doped

Pure phase of Yb3+/Er3+ co-doped β-NaYF4 micron tubes with up-conversion fluorescence were synthesized by hydrothermal method at 180°C for 24 hours. For better utilization of sunlight and improving photocatalytic efficiency of organic dyes, TiO2 nanoparticles were modified by combining with β-NaYF4 micron tubes to form TiO2/NaYF4 composite. Three different combination methods were studied and the photocatalytic activities of the corresponding samples were tested by measuring the degradation rate of rhodamine aqueous solution under illumination of simulated sunlight. The composite that TiO2 nanoparticles were well dispersed on the surface of NaYF4 shows better photocatalytic activity than other composites and was near twice efficiency of pure TiO2 nanoparticles. The reason may be due to the high activity of heterostructure for TiO2/NaYF4 composite that will make it easy for sunlight absorption and photocatalytic degradation.

Radiation-Induced Degradation and the Effect of Scavengers on Benzene, Monochlorobenzene and 1,2-Dichlorobenzene in Aqueous Solutions

2004 ◽  
Vol 39 (3) ◽  
pp. 245-251 ◽  
Author(s):  
Salaheddin Takriti
Keyword(s):  
Aqueous Solution ◽  
High Performance ◽  
Degradation Rate ◽  
Complex Mixture ◽  
Reaction Rates ◽  
Solution Composition ◽  
Halogenated Benzenes ◽  
Radiation Induced ◽  
Rapid Reaction ◽  
By Products

Abstract The degradation of benzene, monochlorobenzene and 1,2-dichlorobenzene in aqueous solution by gamma irradiation was investigated. The effect of the irradiated solution composition was studied. The results showed that benzene is more resistant to destruction than chlorinated benzenes. The presence of oxidizing and reducing reactive species and the rapid reaction rates with halogenated benzenes increased the degradation rate of the pollutants. Dechlorination of CB and 1,2-DCB was observed. High performance liquid chromatography (HPLC) and spectroscopy (UV-Vis) were used to monitor changes in the radiation solutions. The final aqueous irradiation products were shown to be a complex mixture of by-products. The addition of scavengers such as methanol and ethanol required larger doses to decompose the pollutants when compared to those solutions with no additives.

Microwave-Assisted Fabrication of Recyclable CdS/Fe3O4/rGO Photocatalysts to Improve the Photocatalytic Performance Under Visible Light

NANO ◽  
2016 ◽  
Vol 11 (11) ◽  
pp. 1650129 ◽  
Author(s):  
Xinlin Liu ◽  
Yingying Qin ◽  
Mingjun Zhou ◽  
Yongsheng Yan
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Visible Light ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Active Species ◽  
Microwave Method ◽  
Composite Photocatalyst ◽  
Microwave Assisted

A unique CdS/Fe3O4/rGO composite photocatalyst is successfully synthesized by the microwave method. It displays promising photocatalytic activity towards the photo-degrading of tetracycline (TC) in aqueous solution, the degradation rate of TC is 69% with adding 0.1[Formula: see text]g CdS/Fe3O4/rGO photocatalyst into 20[Formula: see text]mg/L tetracycline for 2[Formula: see text]h under visible light irradiation. Furthermore, the mechanism was systematically investigated by active species trapping experiment. It can be known that [Formula: see text] the major active species in the photodegradation process and the possible process of charge transfer for CdS/Fe3O4/rGO was proposed based on the experimental results. The as-prepared samples were carefully evaluated by XRD, TEM, XPS, VSM, PL spectra, Raman spectrometer.

scholarly journals Enhanced Photocatalytic Performance of NiO-Decorated ZnO Nanowhiskers for Methylene Blue Degradation

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
I. Abdul Rahman ◽  
M. T. M. Ayob ◽  
S. Radiman
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Irradiation ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Nio Nanoparticles ◽  
Methylene Blue Degradation ◽  
Maximal Peak ◽  
P Type

ZnO nanowhiskers were used for photodecomposition of methylene blue in aqueous solution under UV irradiation. The rate of methylene blue degradation increased linearly with time of UV irradiation. 54% of degradation rate was observed when the ZnO nanowhiskers were used as photocatalysts for methylene blue degradation for 80 min under UV irradiation. The decoration of p-type NiO nanoparticles on n-type ZnO nanowhiskers significantly enhanced photocatalytic activity and reached 72% degradation rate of methylene blue by using the same method. NiO-decorated ZnO was recycled for second test and shows 66% degradation from maximal peak of methylene blue within the same period. The increment of photocatalytic activity of NiO-decorated ZnO nanowhiskers was explained by the extension of the electron depletion layer due to the formation of nanoscale p-n junctions between p-type NiO and n-type ZnO. Hence, these products provide new alternative proficient photocatalysts for wastewater treatment.

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