Nano ZnO synthesis by modified sol gel method and its application in heterogeneous photocatalytic removal of phenol from water

Hayat, Khizar; Gondal, M.A.; Khaled, Mazen; Ahmed, Shakeel; Shemsi, Ahsan M.

doi:10.1016/j.apcata.2010.11.032

Cited by 226 publications

(96 citation statements)

References 46 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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“…Sol-gel synthesis of ZnO/HAP nanocomposite ZnO/HAP nanopowder was synthesized using the sol-gel technique (Hayat et al 2011). Typically, appropriate amount of zinc acetate (0.018 mol) is solved in 20 mL of 2-propanol for 1 h, then 20 mL of MEA was added to a solution of zinc acetate.…”

Section: Methodsmentioning

confidence: 99%

Photodegradation of odorous 2-mercaptobenzoxazole through zinc oxide/hydroxyapatite nanocomposite

et al. 2014

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In this study, ZnO/HAP nanocomposite with excellent photocatalytic activities was successfully synthesized by sol-gel method and used for degradation of 2-mercaptobenzoxazole (MBO) as model of odorous mercaptan compound in water. To optimize the performance of ZnO/ HAP photocatalytic capabilities, ZnO/HAP loading (0.05-0.3 g/L), irradiation time (15-180 min), pH (3-11) and initial concentration of MBO (10-100 ppm) were investigated. At neutral pH of 7, the highest amount of the MBO (99.45 %) was degraded by ZnO/HAP nanocomposite through photocatalytic oxidation process within 2 h of irradiation time. ). TEM image demonstrated a spherical shape structure of ZnO/HAP with average particle size of 25 nm in diameter. The XRD patterns revealed the principal components of ZnO/HAP including HAP and ZnO. FTIR spectrum results supported formation ZnO and HAP by their stretching mode in composite. Comparison of photocatalytic activity of ZnO/HAP with pure ZnO and HAP nanoparticles had clearly recognized that latter is the most active photocatalyst in the degradation of MBO using UV light as source energy. The reason for greater activity of ZnO/HAP was due to its larger specific surface area (182.36 m

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“…Phenol and oxidation intermediate ring compounds (catechol, hydroquinone and p-benzoquinone) were quantified by Shimadzu HPLC (Hayat et al 2011) by C-18 phenomenex reverse-phase column, degasser (20A5), pump (LC-20AT), and prominences Diode Array Detector (SPD-M20A). The samples were filtered by micro syringe filters (0.2 lm).…”

Section: Methodsmentioning

confidence: 99%

Investigation of optimum conditions and costs estimation for degradation of phenol by solar photo-Fenton process

Alalm

Tawfik

2014

Appl Water Sci

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In this study, solar photo-Fenton reaction using compound parabolic collectors reactor was assessed for removal of phenol from aqueous solution. The effect of irradiation time, initial concentration, initial pH, and dosage of Fenton reagent were investigated. H 2 O 2 and aromatic intermediates (catechol, benzoquinone, and hydroquinone) were quantified during the reaction to study the pathways of the oxidation process. Complete degradation of phenol was achieved after 45 min of irradiation when the initial concentration was 100 mg/L. However, increasing the initial concentration up to 500 mg/L inhibited the degradation efficiency. The dosage of H 2 O 2 and Fe ?2 significantly affected the degradation efficiency of phenol. The observed optimum pH for the reaction was 3.1. Phenol degradation at different concentration was fitted to the pseudo-first order kinetic according to Langmuir-Hinshelwood model. Costs estimation for a large scale reactor based was performed. The total costs of the best economic condition with maximum degradation of phenol are 2.54 €/ m 3 .

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Nano ZnO synthesis by modified sol gel method and its application in heterogeneous photocatalytic removal of phenol from water

Cited by 226 publications

References 46 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)

Photodegradation of odorous 2-mercaptobenzoxazole through zinc oxide/hydroxyapatite nanocomposite

Investigation of optimum conditions and costs estimation for degradation of phenol by solar photo-Fenton process

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