N-doped TiO2 nanosheets for photocatalytic degradation and mineralization of diazinon under simulated solar irradiation: Optimization and modeling using a response surface methodology

Salarian, Amir Ahmad; Hami, Zahra; Mirzaei, Nezam; Mohseni, Seyed Mohsen; Asadi, Anvar; Bahrami, Hamideh; Niri, Mehdi Vosoughi; Alinejad, Abdolazim; Zaré, Mehdi

doi:10.1016/j.molliq.2016.04.060

Cited by 128 publications

(41 citation statements)

References 37 publications

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“…The decrease in degradation from a certain catalyst load may be due to increased opacity of the suspension and also increased light reflectance as a consequence of surplus ZnO particles [17]. The involved reactions in the ZnO photocatalyst system for removal of IBP as an organic pollutant are described before in equations 1 to 8 [19]. pH has an important effect on the removal of IBP by the UV/ ZnO process.…”

Section: Discussionmentioning

confidence: 99%

“…The catalyst has a wurtzite structure and their XRD peaks were in good agreement with the standard card for the hexagonal ZnO crystal (JCPDS 36-1451). The average dimension (D) of particles was calculated using Debye-Sherrer's formula [8] and found to be 28 nm. The morphologies of the catalyst were …”

Section: General Zno Characterizationmentioning

confidence: 99%

“…AOPs as an environmentally friendly and green technology produce a very powerful oxidizing agent, hydroxyl radical • OH, which appears to be an alternative for the degradation of NSAIDs -especially at low concentrations [6]. One of the AOPs is the heterogeneous photocatalysis process, which use semiconductors such as ZnO, CdS, and TiO 2 under UV/visible light as a powerful technique for removing recalcitrant organic pollutants [7][8]. The ZnO semiconductor is comprised of a valence band and conductance band which under illumination higher than band gap produces electron-hole pairs (h + /e -) and is transferred to the ZnO surface, where they are then available to undergo redox reactions with substrates [9].…”

Section: Introductionmentioning

confidence: 99%

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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%

Section: General Zno Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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.

Self Cite

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“…As can be seen, the experimental results were in good correlation with the values predicted by the statistical model. Thus, this prediction model was sufficiently effective and feasible [27]. Furthermore, the adequacy of the obtained model to predict the separated efficiency was analyzed through analysis of variance (ANOVA).…”

Section: Model Fittings and Statistical Analysismentioning

confidence: 97%

“…As can be seen, the experimental results were in good correlation with the values predicted by the statistical model. Thus, this prediction model was sufficiently effective and feasible [27]. Diagnostic plots, such as predicted versus actual values, were used to determine the adequacy of the model.…”

Section: Model Fittings and Statistical Analysismentioning

confidence: 99%

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

Chen

et al. 2018

Minerals

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Flotation separation of chalcopyrite from molybdenite was studied using seaweed glue (SEG) as a depressant. Flotation process and mechanism were examined by response surface methodology, flotation tests, adsorption tests, zeta potential measurements and fourier transform infrared (FT-IR) spectra. Response surface methodology with a Box-Behnken design suggested the optimal reagent schedule: pH 4, depressant seaweed glue 197 mg/L, collector amyl xanthate 16 mg/L and frother (methyl isobutyl carbinol) 20 mg/L, and selective separation of chalcopyrite and molybdenite was achieved by flotation. Comparison of SEG and traditional depressants indicated that the SEG could achieve a similar separation efficiency, and exhibited the advantages of environmental compatibility and economic adaptability. Co-adsorption of seaweed glue and amyl xanthate occurred on the surface of molybdenite, and is explained to happen through distinct mechanisms due to the heterogeneous nature of the surface. It is likely that seaweed glue depresses molybdenite by covering the dixanthogen resulting from adsorption of xanthate ions. It is shown that seaweed glue is as effective a depressant of Cu/Mo separation as cyanide.

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CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

et al. 2021

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A new nanohybrid photocatalyst named cerium (IV) oxide (CeO 2 )/TiO 2 (titania)/silicon dioxide (SiO 2 ) was firstly synthesized employing the coprecipitation technique to elaborate the degradation efficiency of chlorpyrifos (CPS) as a relatively indelible organophosphorus pesticide in deionized water in photocatalytic and sonophotocatalytic processes. The influence of various parameters, including photocatalyst dosage, the CPS pesticide concentration, pH, and irradiation time, was investigated, and the optimal parameters for photodegradation and sonophotodegradation were determined. The activity and the electrical energy of this photocatalyst in the photodegradation and sonophotodegradation processes were compared, and it was revealed that the sonophotocatalytic process was superior to the photocatalytic one (about 15%).Results depicted that it can be employed four times for the photocatalytic reactions with the same yield of CPS degradation. Besides, the CPS degradation efficiency at the optimum conditions was found to be 81.1% and 90.8% for the photo-degradation and sonophotodegradation, respectively. Pursuant to the kinetic studies, the kinetics models that govern these processes are leaner with acceptable accuracy.

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N-doped TiO2 nanosheets for photocatalytic degradation and mineralization of diazinon under simulated solar irradiation: Optimization and modeling using a response surface methodology

Cited by 128 publications

References 37 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

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

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N-doped TiO2 nanosheets for photocatalytic degradation and mineralization of diazinon under simulated solar irradiation: Optimization and modeling using a response surface methodology

Cited by 128 publications

References 37 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

The Effect of Seaweed Glue in the Separation of Copper–Molybdenum Sulphide Ore by Flotation

CeO2/TiO2/SiO2 nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

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Product

Resources

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CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos