Photocatalytic process by immobilized carbon black/ZnO nanocomposite for dye removal from aqueous medium: Optimization by response surface methodology

High energy planetary ball milling was applied to prepare sono-Fenton nanocatalyst from natural martite (NM). The NM samples were milled for 2-6h at the speed of 320rpm for production of various ball milled martite (BMM) samples. The catalytic performance of the BMMs was greater than the NM for treatment of Acid Blue 92 (AB92) in heterogeneous sono-Fenton-like process. The NM and the BMM samples were characterized by XRD, FT-IR, SEM, EDX and BET analyses. The particle size distribution of the 6h-milled martite (BMM) was in the range of 10-90nm, which had the highest surface area compared to the other samples. Then, the impact of main operational parameters was investigated on the process. Complete removal of the dye was obtained at the desired conditions including initial pH 7, 2.5g/L BMM dosage, 10mg/L AB92 concentration, and 150W ultrasonic power after 30min of treatment. The treatment process followed pseudo-first order kinetic. Environmentally-friendly modification of the NM, low leached iron amount and repeated application at milder pH were the significant benefits of the BMM. The GC-MS was successfully used to identify the generated intermediates. Eventually, an artificial neural network (ANN) was applied to predict the AB92 removal efficiency based upon the experimental data with a proper correlation coefficient (R=0.9836).

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“…Therefore, as can be seen in Fig. 12, the RE% decreased by the addition of these scavengers to the dye solution [5,[40][41][42].…”

Section: Effect Of Hydroxyl Radicals Scavengersmentioning

confidence: 69%

Heterogeneous sono-Fenton-like process using martite nanocatalyst prepared by high energy planetary ball milling for treatment of a textile dye

Dindarsafa

Khataee

Kaymak

et al. 2017

Ultrasonics Sonochemistry

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“…The formation of hydroxyl radicals (OH Å ) as one of the most powerful oxidants during a photocatalytic process using ZnO nanoparticles is exhibited through Eqs. (1)-(3) [17,18]:…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

The application of ZnO/SiO2 nanocomposite for the photocatalytic degradation of a textile dye in aqueous solutions in comparison with pure ZnO nanoparticles

Soltani

Khoramabadi

Godini

et al. 2015

Desalination and Water Treatment

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A B S T R A C TOne of the major disadvantages of the application of ZnO nanoparticles as photocatalyst in photocatalytic systems is photoinstability due to the photocorrosion under UV light irradiation resulting in the significant reduction in their photocatalytic activity. Therefore, in the present study, SiO 2 nanopowders were incorporated into the ZnO nanoparticles to enhance their photocatalytic activity for the decolorization of methylene blue (MB) dye in comparison with pure ZnO/UV process. The efficiency of UV/ZnO/SiO 2 process was compared with UV/ZnO process for the decolorization of MB dye and the removal of chemical oxygen demand (COD). The effect of various amounts of SiO 2 (5, 10, and 15%) incorporated into ZnO nanoparticles was studied. At optimal SiO 2 loading of 10%, the decolorization efficiency of MB and the removal of COD were obtained to be 100 and 81%, respectively. However, using UV/ZnO process at the same operational conditions, the decolorization efficiency of MB and the removal of COD were 66 and 44%, respectively. An initial pH of 7 and initial dye concentration of 25 mg/L were chosen as optimal experimental conditions. It can be stated that the incorporation of SiO 2 nanopowders into the ZnO nanoparticles would be beneficial for enhancing their photocatalytic activity.

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“…It has been demonstrated that the catalytically enhanced ultrasonic irradiation based on the application of semiconductors, known as sonocatalysis, has higher degradation efficiency and lower processing time than that of sonication alone [4,6,9,10]. Among various semiconductors, nano-sized ZnO has been widely used as an efficient catalyst due to its large volume to area ratio, wide band gap (3.37 eV), excellent thermal and chemical stability, long life-span and low cost [9][10][11][12]. The presence of ZnO as sonocatalyst results in faster degradation of the target pollutant due to the creation of extra nuclei to form more cavitation bubbles, leading to the generation of more OH Å in the aqueous phase [13].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the toxicity of ZnO nanostructures for aqueous and terrestrial http://dx.doi.org/10.1016/j.ultsonch.2015.07.002 1350-4177/Ó 2015 Elsevier B.V. All rights reserved. environments [15], the immobilization of ZnO nanostructures on a suitable support was considered to avoid their release into the environment and enhance their reusability potential [11]. Furthermore, the immobilization of nano-sized catalyst on an appropriate support could be resulted in the enhanced catalytic activity in comparison with that of pure catalyst.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonically induced ZnO–biosilica nanocomposite for degradation of a textile dye in aqueous phase

Soltani

Jorfi

Ramezani

et al. 2016

Ultrasonics Sonochemistry

123

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In the present study, a porous clay-like support with unique characteristics was used for the synthesis and immobilization of ZnO nanostructures to be used as sonocatalyst for the sonocatalytic decolorization of methylene blue (MB) dye in the aqueous phase. As a result, the sonocatalytic activity of ZnO-biosilica nanocomposite (77.8%) was higher than that of pure ZnO nanostructures (53.6%). Increasing the initial pH from 3 to 10 led to increasing the color removal from 41.8% to 88.2%, respectively. Increasing the sonocatalyst dosage from 0.5 to 2.5 g/L resulted in increasing the color removal, while further increase up to 3g/L caused an obvious drop in the color removal. The sonocatalysis of MB dye over ZnO-biosilica nanocomposite was temperature-dependent. The presence of methanol produced the most adverse effect on the sonocatalysis of MB dye. The addition of chloride and carbonate ions had a negligible effect on the sonocatalysis, while the addition of persulfate ion led to increasing the color removal from 77.8% to 99.4% during 90 min. The reusability test exhibited a 15% drop in the color removal (%) within three consecutive experimental runs. A mineralization efficiency of 63.2% was obtained within 4h.

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Photocatalytic process by immobilized carbon black/ZnO nanocomposite for dye removal from aqueous medium: Optimization by response surface methodology

Cited by 117 publications

References 37 publications

Heterogeneous sono-Fenton-like process using martite nanocatalyst prepared by high energy planetary ball milling for treatment of a textile dye

Heterogeneous sono-Fenton-like process using martite nanocatalyst prepared by high energy planetary ball milling for treatment of a textile dye

The application of ZnO/SiO2 nanocomposite for the photocatalytic degradation of a textile dye in aqueous solutions in comparison with pure ZnO nanoparticles

Ultrasonically induced ZnO–biosilica nanocomposite for degradation of a textile dye in aqueous phase

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