Treatment of emerging contaminants in wastewater treatment plants (WWTP) effluents by solar photocatalysis using low TiO2 concentrations

Prieto-Rodríguez, L.; Miralles-Cuevas, S.; Oller, Isabel; Agüera, Ana; Puma, Gianluca Li; Malato, Sixto

doi:10.1016/j.jhazmat.2011.09.008

Cited by 217 publications

(85 citation statements)

References 27 publications

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“…8 A considerable number of articles have been published regarding removal of harmful compounds from water, wastewater and air, using photocatalytic methods, which imply the importance of the mentioned method in removing pollutants. [8][9][10][11][12][13][14] There are various reports [15][16][17][18] on the application of ZnO and TiO 2 nanoparticles as photocatalysts for the degradation of dyes using response surface methodology. Furthermore, in some of the articles, the photocatalytic degradation of methylene blue (MB) by ZnO/graphene, ZnO nanoparticles NPs/rGO and ZnO/rGO composites have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Graphene Oxide/Zinc Oxide (GO/ZnO) Nanocomposite as a Superior Photocatalyst for Degradation of Methylene Blue (MB)-Process Modeling by Response Surface Methodology (RSM)

Hosseini¹,

Babaei²

2016

Journal of the Brazilian Chemical Society

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The photocatalytic performance of graphene oxide/zinc oxide (GO/ZnO) nanocomposite was investigated for degradation of methylene blue (MB) from wastewater and was compared with that of zinc oxide (ZnO), graphene oxide (GO) and carbon nanotube/zinc oxide (CNT/ZnO). The properties of the GO/ZnO nanocomposite were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The SEM and TEM results revealed the nanostructure of the composite. The photocatalytic process was modeled by response surface methodology (RSM), considering four independent factors. The significance of the model was approved by analysis of variance (ANOVA) (determination coefficient R 2 = 0.95, R 2 adj = 0.91). The optimum conditions of the process were found to be at photocatalyst dosage, initial pH, H 2 O 2 concentration and irradiation time of 2.1 g L -1 , 4.5, 3.5 × 10 -4 mol L -1 and 140 min, respectively. The removal of MB over GO/ZnO was 99% under the optimum conditions and was superior than that over GO and CNT/ZnO. According to Pareto analysis of the modeling, the irradiation time and photocatalyst dosage were the most effective factors on the decolorization efficiency of methylene blue, respectively.

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Section: Introductionmentioning

confidence: 99%

Graphene Oxide/Zinc Oxide (GO/ZnO) Nanocomposite as a Superior Photocatalyst for Degradation of Methylene Blue (MB)-Process Modeling by Response Surface Methodology (RSM)

Hosseini¹,

Babaei²

2016

Journal of the Brazilian Chemical Society

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“…A detailed mathematical description of these techniques is mentioned in [27,28]. However, these techniques are summarized in the two steps: (1) Obtaining data matrices at the optimum conditions from the UV-Visible spectra recorded during photodegradation of the CV dye (D d (i×j)) and blank (D b (i×j)), where i is the number of the recorded spectra (i = 22) and j is the number of the wavelengths (j = 451). (2) Using soft-modelling approach (MCR-ALS) which is based on the bilinear model according to the following relation:…”

Section: Methodology and Chemometric Analysismentioning

confidence: 99%

“…A considerable number of these studies have been conducted by using TiO 2 photocatalytic oxidation method [1]. This method has been developed to degrade organic and inorganic pollutants into nontoxic species (e.g.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Khalilian¹,

Semnani²,

Nekoeinia³

2018

Bull. Chem. Soc. Eth.

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ABSTRACT. In this study, optimisation of the photocatalytic behaviour of crystal violet (CV) by thiourea (Tu)-codoped TiO2 thin film in fixed bed photoreactor was investigated by central composite designs (CCDs). The effective variables were pH, the concentration of CV dye, flow rate and reaction time. The results of the CCD model showed a good agreement with experimental results, with R 2 = 0.9680 (p < 0.0001) and maximum degradation efficiency was obtained at the optimum conditions: dye concentration 8.5 mg/L, pH 9, flow rate 6 mL/min and reaction time 80 min. Subsequently, three absorbing chemical compounds presented in the degradation reaction were obtained by using singular value decomposition (SVD) method and evolving factor analysis (EFA). Then a multivariate curve resolution with alternating least squares (MCR-ALS) was performed to achieve the concentration and spectral profiles for each component. Finally, a hard modelling method was applied to determine the kinetic constants of distinct reactions occurred in the photocatalytic degradation process. The reaction rate constants were calculated for the first and second steps as k1 = 0.08327 (SD = ±0.0015) /min and k2 = 0.045 (SD = ±0.0006)/min, respectively.

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“…These materials are excreted in urine and not completely removed from biological wastewater treatment, resulting in their often being detected in secondary effluent of wastewater treatment plants or in local aquatic systems (Holm et al, 1995: Ternes, 1998: Hirsch et al, 1999: Lapworth et al, 2012: Kim et al, 2013: Li et al, 2013; accordingly, safe and cost-effective methods for their removal are required. Advanced oxidation including ultraviolet irradiation, ozonation, Fenton reaction and photocatalytic decomposition, and adsorption are commonly applied to remove pharmaceuticals and personal care products from wastewater (Fukahori et al, 2012: Prieto-Rodriguez et al, 2012: Cao et al, 2013: Gao et al, 2014: Ji et al, 2014: Lian et al, 2015. Additionally, our group found that high-silica zeolite was effective for adsorption of sulfonamide antibiotics from porcine urine even though high amounts of co-existing materials such as urea, ions, and organic materials were also present (Fukahori et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Sulfonamide antibiotic removal and nitrogen recovery from synthetic urine by the combination of rotating advanced oxidation contactor and methylene urea synthesis process

Fukahori

Fujiwara

Ito

et al. 2015

Water Science and Technology

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The combination of nitrogen recovery and pharmaceutical removal processes for livestock urine treatment were investigated to suppress the discharge of pollutants and recover nitrogen as resources. We combined methylene urea synthesis from urea and adsorption and photocatalytic decomposition of sulfonamide antibiotic using rotating advanced oxidation contactor (RAOC) contained for obtaining both safe fertilizer and reclaimed water. The methylene urea synthesis could recover urea in synthetic urine, however, almost all sulfonamide antibiotic was also incorporated, which is unfavorable from a safety aspect if the methylene urea is to be used as fertilizer. On the other hand, RAOC could remove sulfonamide antibiotic without consuming urea. It was also confirmed methylene urea could be synthesized from synthetic urine treated by RAOC thus we concluded that RAOC should be inserted prior to nitrogen recovery process for effective treatment of urine and safe use of methylene urea as fertilizer.

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Treatment of emerging contaminants in wastewater treatment plants (WWTP) effluents by solar photocatalysis using low TiO2 concentrations

Cited by 217 publications

References 27 publications

Graphene Oxide/Zinc Oxide (GO/ZnO) Nanocomposite as a Superior Photocatalyst for Degradation of Methylene Blue (MB)-Process Modeling by Response Surface Methodology (RSM)

Graphene Oxide/Zinc Oxide (GO/ZnO) Nanocomposite as a Superior Photocatalyst for Degradation of Methylene Blue (MB)-Process Modeling by Response Surface Methodology (RSM)

Photocatalytic degradation of crystal violet by thiourea-doped TiO2 thin film fixed bed photoreactors under visible irradiation: Optimisation using central composite designs and kinetics studies by multivariate curve resolution

Sulfonamide antibiotic removal and nitrogen recovery from synthetic urine by the combination of rotating advanced oxidation contactor and methylene urea synthesis process

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