Sonolytic, photocatalytic and sonophotocatalytic degradation of malachite green in aqueous solutions

Berberidou, Chrysanthi; Poulios, Ioannis; Xekoukoulotakis, Nikolaos P.; Mantzavinos, Dionissios

doi:10.1016/j.apcatb.2007.01.013

Cited by 288 publications

(134 citation statements)

References 26 publications

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“…Fourthly, increase surface area due to ultrasound de-aggregating catalyst particles. 22 The activity of pure TiO2, Fe/TiO2 and Fe/TiO2-MWCNT catalyst was evaluated by comparing the apparent first order kinetics as shown below.…”

Section: Resultsmentioning

confidence: 99%

“…Possibly, the following two points of view, namely, sonoluminescence and "hot spot", could be accepted to explain the sonolysis of organic dye in presence of TiO2 catalyst. 22,36 First, the ultrasonic irradiation can form light with a comparatively wide wavelength range. It is well known that the wavelengths below 387 nm can excite the TiO 2 particles to act as a photocatalyst, hence to bring hole and electron pairs.…”

Section: Resultsmentioning

confidence: 99%

“…20,21 In addition, little attention has been focused on coupling ultrasound with photocatalytic, the simultaneous use of sonocatalytic and photocatalytic was called sonophotocatalytic, which had been used to degrade organic pollutants. 22,23 The aim of this work is to prove a high photo-, sonocatalytic activity and sonophotocatalytic on MWCNT deposited with Fe and TiO2, employed under normal atmosphere in the absence of any oxidant chemical species, in the degradation and mineralization of MB solution. Following recent our studies 24,25 on use of photocatalysis in degradation of various dyes, possible synergistic effects between Fe particles and one kind of carbon in degradation of MB under ultrasonic irradiation with low frequency ultrasound have been checked in the present work.…”

Section: • ) and Hydroxyl Radicals (Oh •mentioning

confidence: 99%

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Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO₂-MWCNT Catalyst

Zhang¹,

Oh²

2010

Bulletin of the Korean Chemical Society

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In order to effective degradation of organic dye both under visible light or ultrasonic irradiation, the MWCNTs (multiwalled carbon nanotube) deposited with Fe and TiO2 were prepared by a modified sol-gel method. The Fe/TiO2-MWCNT catalyst was characterized by surface area of BET, scanning electron microscope (SEM), Transmission Electron Microscope (TEM), X-ray diffraction (XRD), and energy dispersive X-ray (EDX) and ultraviolet-visible (UV-vis) spectroscopy. The low intensity visible light and low power ultrasound was as an irradiation source and the methylene blue (MB) was choose as the model organic dye. Then degradation experiments were carried out in present of undoped TiO2, Fe/TiO2 and Fe/TiO2-MWCNT catalysts. Through the degradation of MB solution, the results showed the feasible and potential use of Fe/TiO2-MWCNT catalyst under visible light and ultrasonic irradiation due to the enhanced formation of reactive radicals as well as the possible visible light and the increase of ultrasound-induced active surface area of the catalyst. After addition of H2O2, the MB degradation rates have been accelerated, especially with Fe/TiO2-MWCNT catalyst, in case of that the photo-Fenton reaction occurred. The sonophotocatalysis was always faster than the respective individual processes due to the more formation of reactive radicals as well as the increase of the active surface area of Fe/TiO2-MWCNT catalyst.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: • ) and Hydroxyl Radicals (Oh •mentioning

confidence: 99%

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Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO₂-MWCNT Catalyst

Zhang¹,

Oh²

2010

Bulletin of the Korean Chemical Society

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“…Therefore, synergy is 13.3% Berberidou C. et al have shown a similar synergistic effect on the degradation of Malachite green in aqueous solution [4].…”

Section: Synergistic Effect With Ultrasoundmentioning

confidence: 85%

Photocatalytic, Sonolytic and Sonophotocatalytic Degradation of 4-Chloro-2-Nitro Phenol

Verma¹,

Kaur²,

Dixit³

2013

Archives of Environmental Protection

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Abstract:The photocatalytic, sonolytic and sonophotocatalytic degradation of 4-chloro-2-nitrophenol (4C2NP) using heterogeneous (TiO 2 ) was investigated in this study. Experiments were performed in slurry mode with artifi cial UV 125 watt medium pressure mercury lamp coupled with ultrasound (100 W, 33+3 KHz) for sonication of the slurry. The degradation of compound was studied in terms of fi rst order kinetics. The catalyst concentration was optimized at 1.5 gL -1 , pH at 7 and oxidant concentration at 1.5 gL -1 . The results obtained were quite appreciable as 80% degradation was obtained for photocatalytic treatment in 120 minutes whereas, ultrasound imparting synergistic effect as degradation achieved 96% increase in 90 minutes during sonophotocatalysis. The degradation follows the trend sonophotocatalysis > photocatalysis > sonocatalytic > sonolysis. The results of sonophotocatalytic degradation of pharmaceutical compound showed that it could be used as effi cient and environmentally friendly technique for the complete degradation of recalcitrant organic pollutants which will increase the chances for the reuse of wastewater.

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“…Malachite green (MG) (shown in Figure 1) is a cationic dye belonging to the triphenylmethane dye category, which is widely used for dyeing of textile, leather and paper, printing, and treating parasites, fungal and bacterial infections in fish and fish eggs [5]. However, this noxious dye can cause carcinogenic, mutagenic and teratogenic effects on humans and animals [6][7][8][9]. Thereby, the removal of MG from wastewater before being discharged into surface water bodies is indispensible and significant.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

Ruan

Shi

et al. 2017

Applied Sciences

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Abstract:The commercially available nanoscale zerovalent zinc (nZVZ) was used as an adsorbent for the removal of malachite green (MG) from aqueous solutions. This material was characterized by X-ray diffraction and X-ray photoelectron spectroscopy. The advanced experimental design tools were adopted to study the effect of process parameters (viz. initial pH, temperature, contact time and initial concentration) and to reduce number of trials and cost. Response surface methodology and rapidly developing artificial intelligence technologies, i.e., artificial neural network coupled with particle swarm optimization (ANN-PSO) and artificial neural network coupled with genetic algorithm (ANN-GA) were employed for predicting the optimum process variables and obtaining the maximum removal efficiency of MG. The results showed that the removal efficiency predicted by ANN-GA (94.12%) was compatible with the experimental value (90.72%). Furthermore, the Langmuir isotherm was found to be the best model to describe the adsorption of MG onto nZVZ, while the maximum adsorption capacity was calculated to be 1000.00 mg/g. The kinetics for adsorption of MG onto nZVZ was found to follow the pseudo-second-order kinetic model. Thermodynamic parameters (∆G 0 , ∆H 0 and ∆S 0 ) were calculated from the Van't Hoff plot of lnKc vs. 1/T in order to discuss the removal mechanism of MG.

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Sonolytic, photocatalytic and sonophotocatalytic degradation of malachite green in aqueous solutions

Cited by 288 publications

References 26 publications

Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO₂-MWCNT Catalyst

Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO₂-MWCNT Catalyst

Photocatalytic, Sonolytic and Sonophotocatalytic Degradation of 4-Chloro-2-Nitro Phenol

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

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Sonolytic, photocatalytic and sonophotocatalytic degradation of malachite green in aqueous solutions

Cited by 288 publications

References 26 publications

Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO2-MWCNT Catalyst

Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO2-MWCNT Catalyst

Photocatalytic, Sonolytic and Sonophotocatalytic Degradation of 4-Chloro-2-Nitro Phenol

Modeling of Malachite Green Removal from Aqueous Solutions by Nanoscale Zerovalent Zinc Using Artificial Neural Network

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Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO₂-MWCNT Catalyst

Kinetic Study of the Visible Light-Induced Sonophotocatalytic Degradation of MB Solution in the Presence of Fe/TiO₂-MWCNT Catalyst