Preparation of multi-walled carbon nanotube-doped TiO2 composite and its application in petroleum refinery wastewater treatment

Shahrezaei, Fatemeh; Pakravan, Parvaneh; Azandaryani, Abbas Hemati; Pirsaheb, Meghdad; Mansouri, Amir

doi:10.1080/19443994.2015.1067165

Cited by 19 publications

(5 citation statements)

References 26 publications

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“…In these processes, ultraviolet radiation to the semiconductor material excites the electrons from the valence to conduction band. Electron excitation produces hydroxyl radicals in aqueous environments, a phenomenon that causes oxidation of organic compounds into low-risk and safe ones 14 – 16 . Zinc oxide nanoparticles are suitable for this purpose and are being widely used for AOPs 17 .…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of Aniline from aqueous solutions under sunlight illumination using immobilized Cr:ZnO nanoparticles

Pirsaheb

Shahmoradi

Beikmohammadi

et al. 2017

Sci Rep

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The present study aimed at synthesizing chromium doped zinc oxide nanoparticles (Cr:ZnO NPs) under mild hydrothermal conditions (temperature ~100 °C, p = autogenous and time ~12 hr). Chromium oxide and n-butylamine were used as dopant and surface modifier, respectively. The characteristics of the synthesized nanoparticles were determined through conducting specialized experiments including powder XRD, FTIR, SEM, EDX, and UV-VIS spectroscopy. Then, the Cr:ZnO NPs were immobilized on a sandblasted glass through thermal method. The photocatalytic degradation of aniline was conducted in a continuous reactor with a volume of 1.5 liters. Before and after photocatalytic degradation, the immobilized Cr:ZnO NPs were characterized for SEM and EDX to determine the degree of stability of immobilized nanoparticles as well as the influence of the current applied on them. The photodegradation operational parameters investigated were aniline initial concentration (150, 200, and 250 mg/L), pH (5, 7, 6, and 12), and reaction time (2, 4, and 6 hours) under sunlight illumination. The characterization results indicated high purity of the Cr:ZnO NPs and no change in morphology or composition even after the immobilization and photo-oxidation process. Finally, it was found that the optimum conditions for 93% removal of aniline under sunlight illumination was about 6 hours retention time at pH 9.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of Aniline from aqueous solutions under sunlight illumination using immobilized Cr:ZnO nanoparticles

Pirsaheb

Shahmoradi

Beikmohammadi

et al. 2017

Sci Rep

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“…Since their discovery, multi-walled carbon nanotubes (MWCNTs) with one-dimensional and hollow structure have received more attention for environmental purification because of their outstanding structural characters such as mechanical strength [35], excellent thermal conductivity, unique electronic properties [36], and thermal stability [37]. The preparation of new composite containing MWCNTs and TiO 2 depends on many factors such as excellent conductance and high adsorption capacity of MWCNTs, which act as TiO 2 support [38,39]. A similar literature has shown that the activities of the TiO 2 increase due to the abilities of MWCNTs to decrease TiO 2 crystalline grain and particle sizes [40].…”

Section: Introductionmentioning

confidence: 99%

Quaternary Ag/AgCl/TiO2/MWCNTs nanocomposite: an efficient visible-light driven plasmonic photocatalyst for degradation of 2,4-dichlorophenol

Seirafi¹,

Pirbazari²,

Aroon³

2018

Desalination and Water Treatment

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a b s t r a c tIn this research, we developed a facile method to synthesize quaternary plasmonic photocatalysts Ag/AgCl/TiO 2 /MWCNTs with a high photocatalytic performance for degradation of 2,4-dichlorophenol (2,4-DCP) under visible light. The prepared samples were characterized by different analyses such as X-ray diffraction, scanning electron microscopy, energy dispersive X-ray, ultraviolet-visible diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy, N 2 physisorption, and transmission electron microscopy. The prepared samples exhibited highly visible-light photocatalytic efficiency for degradation of 2,4-DCP in aqueous solution. In the presence of pure TiO 2 and quaternary Ag/AgCl/ TiO 2 /MWCNTs nanocomposite, we obtained 40% and almost 100% degradations of 2,4-DCP under visible light after 180 min irradiation, respectively. The excellent visible light photocatalytic activity of Ag/AgCl/TiO 2 /MWCNTs samples can be attributed to the surface plasmon resonance effect of Ag nanoparticles anchored on AgCl particles and adsorption ability of MWCNTs.

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“…Khan et al, (2015) reported that TiO2 was comparatively more effective than ZnO and H2O2 for real refinery wastewater. Shahrezaei et al (2015) proved that the degradation efficiency of COD was improved by using TiO2 with the multi-walled carbon nanotube to treat the petroleum wastewater due to the large ability of Multi-walled carbon nanotube (MWCNT) to adsorb organic molecules and to suppress the electron-hole recombination. Shahrezaei et al (2015) reported that the most important factor, which limits the efficiency of photocatalyst of TiO2, was electronhole recombination.…”

Section: Photocatalyst Of Tio2 Zno and Tio2/znomentioning

confidence: 99%

“…Shahrezaei et al (2015) proved that the degradation efficiency of COD was improved by using TiO2 with the multi-walled carbon nanotube to treat the petroleum wastewater due to the large ability of Multi-walled carbon nanotube (MWCNT) to adsorb organic molecules and to suppress the electron-hole recombination. Shahrezaei et al (2015) reported that the most important factor, which limits the efficiency of photocatalyst of TiO2, was electronhole recombination. MWCNT was used to suppress the electron-hole recombination and enhanced the photocatalytic efficiency of titanium dioxide (TiO2) nanoparticles (Shahrezaei et al, 2015).…”

Section: Photocatalyst Of Tio2 Zno and Tio2/znomentioning

confidence: 99%

“…Shahrezaei et al (2015) reported that the most important factor, which limits the efficiency of photocatalyst of TiO2, was electronhole recombination. MWCNT was used to suppress the electron-hole recombination and enhanced the photocatalytic efficiency of titanium dioxide (TiO2) nanoparticles (Shahrezaei et al, 2015). Anju et al (2012) reported that the removal efficiency of phenol for the combination of ZnO/TiO2/UV process was enhanced from 37% to 46% at 90 min in aqueous solutions after using H2O2 with this combination.…”

Section: Photocatalyst Of Tio2 Zno and Tio2/znomentioning

confidence: 99%

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Performance of advanced oxidation processes to treat the petroleum wastewater A review

2017

Global NEST Journal

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The objective of this study is to summarize studies and investigations about advanced oxidation processes (AOPs) used for the treatment of petroleum wastewater, which mainly contained oil, organic matter and other compounds. The big difference was shown in the specification of wastewater among the investigated studies and a wide variety of pollutants at varying concentrations. The most compounds in petroleum wastewater were the mixture of hydrocarbons and inorganic compounds. Advanced oxidation processes (AOPs) have a capability of rapid degradation of recalcitrant pollutants in the aquatic environment. However, the literature regarding petroleum wastewater treatment is very little and advanced oxidation processes (AOPs) are still not being used on an industrial scale in oil refineries. Most studies were focused on the degradation of some pollutants found in the petroleum wastewater such as sulphides, ammonia, phenols and organic materials. This review focused on works that investigated advanced oxidation processes (AOPs) by monitoring general petroleum wastewater parameters such as TOC, COD, BOD, oil, and phenols. It presented an overview of photocatalytic degradation of pollutants in petroleum wastewater and highlighted the basics of these processes including the optimum parameters.

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Preparation of multi-walled carbon nanotube-doped TiO2 composite and its application in petroleum refinery wastewater treatment

Cited by 19 publications

References 26 publications

Photocatalytic degradation of Aniline from aqueous solutions under sunlight illumination using immobilized Cr:ZnO nanoparticles

Photocatalytic degradation of Aniline from aqueous solutions under sunlight illumination using immobilized Cr:ZnO nanoparticles

Quaternary Ag/AgCl/TiO2/MWCNTs nanocomposite: an efficient visible-light driven plasmonic photocatalyst for degradation of 2,4-dichlorophenol

Performance of advanced oxidation processes to treat the petroleum wastewater A review

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