Pure ZnO and composite ZnO/TiO2 catalyst plates: A comparative study for the degradation of azo dye, pesticide and antibiotic in aqueous solutions

Topkaya, Eylem; Konyar, Mehmet; Yatmaz, H. Cengiz; Öztürk, Koray

doi:10.1016/j.jcis.2014.05.022

Cited by 109 publications

(32 citation statements)

References 58 publications

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“…The photocatalytic activity and stability of the as-prepared catalyst 2a was evaluated by catalytically photodegrading a series 85 of 12 common azo dyes including methyl orange (MO), acid orange 7, orange I, orange IV, orange G, congo red, acid red 27, sunset yellow, amido black 10B, nigrosin, acid chrome blue K and eriochrome black T in water under UV light irradiation (Table 1). For comparison, the photocatalytic performances of 1 90 and 2 were also presented.…”

Section: Photocatalytic Activity Studymentioning

confidence: 99%

“…Compared with other known photocatalysts listed in Table 1, 2a indicated much better catalytic activity towards photodegrading azo dyes in terms of the reaction time and efficiency. [74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91] The known photocatalysts The recyclable performance of a photocatalyst is an important factor in the catalytic photodegradation reaction. In this work, 2a could be readily recovered from the catalytic system via 60 centrifugation and reused for photodecomposing freshly-prepared azo dyes in water for several times under UV light irradiation.…”

Section: Photocatalytic Activity Studymentioning

confidence: 99%

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Facile synthesis of a Ag(i)-doped coordination polymer with enhanced catalytic performance in the photodegradation of azo dyes in water

Wang

et al. 2015

J. Mater. Chem. A

122

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Ambient temperature solid state reaction of a preformed compound {[Pb(Tab) 2 ] 2 (PF 6 ) 4 } n (1) (TabH = 4-(trimethylammonio)benzenethiol) with two equiv. of 1,2-bis(4-pyridyl)ethylene (bpe) quantitatively produces one unique two-dimensional coordination polymer {[Pb(Tab) 2 (bpe)] 2 (PF 6 ) 4 } n (2). The Ag(I)-doped coordination polymer {[Pb(Tab) 2 (bpe)] 2 (PF 6 ) 4 ·1.64AgNO 3 } n (2a) is readily prepared by immersing 10 2 into AgNO 3 aqueous solution. Compared with its two precursors 1 and 2, 2a exhibits greatly enhanced catalytic activity towards the photodegradation of a family of 12 azo dyes within a short period of time under UV light irradiation and excellent adaptability on the elimination of azo dyes in water. It is anticipated that the 'Ag(I)-doping' synthetic strategy reported in this work may be applicable to other coordination polymer systems containing thiolate ligands for the preparation of various metal ion-doped 15 multidimensional coordination polymers with new topological structures and better catalytic performances in photodecomposing azo dyes in industrial wastewater.

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Section: Photocatalytic Activity Studymentioning

confidence: 99%

Section: Photocatalytic Activity Studymentioning

confidence: 99%

Facile synthesis of a Ag(i)-doped coordination polymer with enhanced catalytic performance in the photodegradation of azo dyes in water

Wang

et al. 2015

J. Mater. Chem. A

122

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“…One of the helpful strategies to overcome these disadvantages is coupling TiO 2 with other narrowband gap semiconductors to absorb the visible light [10]. Many studies have reported that TiO 2 combined with other metal oxides can improve the photocatalytic activity, such as ZnO-TiO 2 , SnO 2 -TiO 2 , Bi 2 O 3 -TiO 2 , ZrO 2 -TiO 2 , Cu 2 O-TiO 2 , WO 3 -TiO 2 , In 2 O 3 -TiO 2 , and CeO 2 -TiO 2 [11][12][13][14][15][16][17][18]. Among them, CeO 2 -TiO 2 obtained a great deal of attention [19].…”

Section: Introductionmentioning

confidence: 99%

Preparation of hollow core/shell CeO2@TiO2 with enhanced photocatalytic performance

Zhang

Jiu

et al. 2015

J Mater Sci

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In this study, hollow core/shell CeO 2 @TiO 2 photocatalysts were prepared via precipitation-co-hydrothermal method. X-ray diffraction, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, thermo-gravimetric-differential thermal analysis, and photoluminescence were used for the characterization of prepared photocatalysts. The synthesis variables were optimized in the photocatalytic removal of rhodamine B (rhB) as a model dye pollutants. The results showed that hollow core/ shell CeO 2 @TiO 2 exhibit a significantly enhanced photocatalytic activity in degradation of rhB under either UV or visible light irradiation. The formation of the hollow core/ shell CeO 2 @TiO 2 and the photocatalytic mechanisms under UV and visible light were also discussed.

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“…This radical is an extremely strong oxidizing agent with high oxidation potential of 2.8 V, short-lived and non-selective oxidation 6 . The heterogeneous photocatalysis mediated by an n-type semiconductor as zinc oxide is one of the most investigated advanced oxidation processes for purification of water contaminated by organic compounds [7][8][9][10] . When the semiconductor absorbs a photon with enough energy, the electron from the valence band is promoted to the conduction band, forming the electron-hole pair.…”

Section: Introductionmentioning

confidence: 99%

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

Silva

Takashima

2015

J. Chil. Chem. Soc.

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Zinc oxide, an n-type semiconductor, has been used as photocatalyst for contaminated water purification by organic compounds. The addition of a p-type semiconductor as copper oxide could increase the catalytic efficiency through the p-n junction in order to decrease the electron-hole recombination. In this work, zinc and copper oxides containing 1.0, 3.0, and 5.0 % of copper were prepared by manual grinding, followed by heat treatment at 300ºC during 5 h. The zinc oxide and copper oxide mixture as well as their precursors were characterized by x-ray diffraction, diffuse reflectance, scanning electron microscopy, and x-ray fluorescence. The photocatalytic efficiency was verified by the direct red 80 tetraazodye decolorization using UV radiation under pseudo-first order conditions at natural pH (7.5-8.0) and 30 °C. The highest photocatalytic activity occurred to the semiconductor containing 1.0 % copper oxide, whose decolorization rate constant was equivalent to 6.40×10 -2 min -1 , that is, 17.4 % larger in comparison to ZnO, 5.45×10 -2 min -1 .

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Pure ZnO and composite ZnO/TiO2 catalyst plates: A comparative study for the degradation of azo dye, pesticide and antibiotic in aqueous solutions

Cited by 109 publications

References 58 publications

Facile synthesis of a Ag(i)-doped coordination polymer with enhanced catalytic performance in the photodegradation of azo dyes in water

Facile synthesis of a Ag(i)-doped coordination polymer with enhanced catalytic performance in the photodegradation of azo dyes in water

Preparation of hollow core/shell CeO2@TiO2 with enhanced photocatalytic performance

PREPARATION AND CHARACTERIZATION OF ZnO/CuO SEMICONDUCTOR AND PHOTOCATALYTIC ACTIVITY ON THE DECOLORIZATION OF DIRECT RED 80 AZODYE

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