Photocatalytic treatment of a dye solution using immobilized TiO2 nanoparticles combined with photoelectro-Fenton process: Optimization of operational parameters

Khataee, Alireza; Zarei, Mahmoud; Asl, Shahin Khameneh

doi:10.1016/j.jelechem.2010.07.017

Cited by 100 publications

(37 citation statements)

References 44 publications

(61 reference statements)

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“…4, the degradation of IBP decreases with increasing IBP concentration. As initial IBP concentration decreases, more hydroxyl radicals ( • OH ) are available to remove the IBP, which in turn leads to increasing IBP degradation efficiency [22].…”

Section: Discussionmentioning

confidence: 99%

Optimizing Parameters on Nanophotocatalytic Degradation of Ibuprofen Using UVC/ZnO Processes by Response Surface Methodology

Rastkari¹,

Eslami²,

Nasseri³

et al. 2017

Pol. J. Environ. Stud.

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Due to the increasing importance of low-concentrated pollution of water resources, the photocatalytic decomposition of ibuprofen down to low ppm concentrations over zinc oxide catalyst has been studied. The aim of this work was to evaluate the degradation of the non-steroidal anti-inflammatory drug (NSAID) ibuprofen (IBP) using heterogeneous ZnO photocatalyst under UV-C irradiation. The photo catalyst was characterized by field emission scanning electron microscope (FE-SEM) and x-ray diffraction (XRD). The photocatalytic activity of ZnO nanoparticle was evaluated in a cylindrical glass reactor under VU-C irradiation light. Central composite design (CCD) and response surface methodology (RSM) were employed for modeling and optimizing the IBP degradation under different variables such as initial pH, ZnO loading, humic acid concentration, initial IBP concentration, and reaction time. The results of our experiments showed that the reaction time had its highest positive effect on IBP degradation. The correlation coefficient (R 2 ) value of 0.856 indicated a good agreement between the experimental results and the model predictions. Optimization results showed that the maximum IBP degradation was attained at optimum conditions of pH 6.7, catalyst loading 583 mg/L, initial IBP concentration 1.5 mg/L, humic acid concentration 54 mg/L, and reaction time of 95 min. Under these conditions we achieved maximum IBP removal efficiency of 82.97%. In conclusion, ZnO was found to be an effective photo catalyst and a promising alternative for producing free OH radicals for degradation of ibuprofen as an emerging pollutant in water resources.

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Section: Discussionmentioning

confidence: 99%

Optimizing Parameters on Nanophotocatalytic Degradation of Ibuprofen Using UVC/ZnO Processes by Response Surface Methodology

Rastkari¹,

Eslami²,

Nasseri³

et al. 2017

Pol. J. Environ. Stud.

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“…), certain amount of hydroxyl radicals are produced. When the concentration of the dye is increased, the amount of hydroxyl radicals is not enough to decolorize the high concentrations of the dye, then removal efficiency decreases [38].…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Decolorization of C.I. Basic Yellow 28 solution using supported ZnO nanoparticles coupled with photoelectro-Fenton process

Iranifam

Zarei

Khataee

2011

Journal of Electroanalytical Chemistry

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“…41 (11) The predicted degradation efficiency obtained from Eq. 41 It was also revealed from ANOVA results that all model terms, including first and second order main effects and interaction effects, are significant because of small p-values (significant probability values). The significance and adequacy of the model was tested using the analysis of variance (ANOVA) calculation and the obtained results are summarized in Table 3.…”

Section: Rsm Model Development and Its Significant Analysismentioning

confidence: 99%

Fabrication of a novel ZnO/MMO/CNT nanohybrid derived from multi-cationic layered double hydroxide for photocatalytic degradation of azo dye under visible light

2015

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With the purpose of the enhancement of photocatalytic performance in the visible region and efficient electron−hole separation, we reported a facile method for synthesis of mixed metal oxide/ZnO/CNT (MMO/ZnO/CNT) nanohybrid derived from ZnO/Co-Ni-Al layered double hydroxide (LDH) precursor. The structural and morphological aspects of the synthesized products were characterized by X-ray diffraction, scanning electron microscopy, UV/vis diffuse reflectance spectra, and FT-IR spectroscopy. The photocatalytic activity of synthesized ZnO/MMO/CNT nanohybrid was investigated by photocatalytic degradation of C.I. Acid Red 14, as a model pollutant, under visible light irradiation. The photocatalytic activity of ZnO/MMO/CNT was also compared with TiO 2 -P25, ZnO, and ZnO/Co-Ni-Al-LDH /CNT. The experimental results revealed that in comparison with other used photocatalysts, ZnO/MMO/CNT nanohybrid was an efficient photocatalyst under visible light irradiation. The effect of operational parameters including photocatalyst content, dye concentration, pH, and irradiation time on the photocatalytic removal efficiency of dye was investigated and optimized using response surface methodology approach. The photocatalyst dosage of 0.009 g, initial dye concentration of 20 mg/L, pH of 4.12, and irradiation time of 150 min were obtained as the optimum condition. In the proposed optimum condition, the catalyst reusability tests were carried out for five runs. Negligible decrease in degradation efficiency confirmed high potential of stability and reusability for the ZnO/MMO/CNT photocatalyst. 4 the ZnO/MMO/CNT mixed metal oxide nanohybrid, (2) investigation of photocatalytic activity of the synthesized ZnO/MMO/CNT mixed metal oxide nanohybrid for the removal of C.I Acid Red 14 (AR14), as a model organic pollutant, in aqueous solution, and (3) optimization and modeling of photocatalytic performance by response surface methodology (RSM) approach. Experimental Materials and instrumentsAll steps of synthesis were conducted using bidistilled water. The pH values were adjusted by combining different amounts of 1 N solutions of Na 2 CO 3 and 0.1 M solution of HNO 3 . NiCl 2 .6H 2 O, CoCl 2 .6H 2 O, AlCl 3 .6H 2 O, and Zn(CH 3 COO) 2 .2H 2 O were purchased from Merck chemical company. Pristine MWCNTs with a diameter of 10-20 nm and length of 1 µm was obtained from nano lab (Brighton, MA). ZnO nanoparticles were obtained from Fluka chemical company. TiO 2 nanoparticles (Degussa P-25) were obtained from Sigma Aldrich chemical company. C.I. Acid Red 14 was obtained from Solar Fine Chemical Company (Taiwan). All of the chemicals were used without further purification. Powder x-ray diffraction (PXRD) patterns of the samples were recorded by a Bruker AXS model D8 advanced diffractometer for Cu K α radiation (λ=1.54187 Å) at 40 kV and 35 mA with Bragg angle ranging from 3 to 70 °. The FTIR spectra were obtained using a Bruker spectrophotometer in the range of 400-4000 cm −1 . The pH values were measured by Hana pH-meter model 211. The thermogravimetric a...

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Photocatalytic treatment of a dye solution using immobilized TiO2 nanoparticles combined with photoelectro-Fenton process: Optimization of operational parameters

Cited by 100 publications

References 44 publications

Optimizing Parameters on Nanophotocatalytic Degradation of Ibuprofen Using UVC/ZnO Processes by Response Surface Methodology

Optimizing Parameters on Nanophotocatalytic Degradation of Ibuprofen Using UVC/ZnO Processes by Response Surface Methodology

Decolorization of C.I. Basic Yellow 28 solution using supported ZnO nanoparticles coupled with photoelectro-Fenton process

Fabrication of a novel ZnO/MMO/CNT nanohybrid derived from multi-cationic layered double hydroxide for photocatalytic degradation of azo dye under visible light

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