Effect of ZnO morphology on photocatalytic activity determined by no oxidation

Download

index.pdf

Date

2019

Author

Kahraman, Orhun

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

216
views

142
downloads

In this thesis, the ISO 22197-1 standard test method -for assessing photocatalytic activity by NO oxidation- was used to determine the activity of a series of ZnO samples prepared by a wet chemical synthesis method. The crystallinity of the samples was monitored by XRD and the morphology of the samples was investigated by SEM analysis. NO oxidation measurements revealed that the samples having long range ordered hexagonal morphology shown better photocatalytic activity than those with flake-like morphology. Further analysis suggested that the 001 plane of wurtzite is the most active plane for photocatalytic NO oxidation.

Subject Keywords

Nitrogen oxides., Keywords: ZnO, Morphology, Photocatalysis, NO Oxidation.

URI

http://etd.lib.metu.edu.tr/upload/12623188/index.pdf
https://hdl.handle.net/11511/43361

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Effect of initial water content and calcination temperature on photocatalytic properties of TiO2 nanopowders synthesized by the sol-gel process Agartan, Lutfi; Kapusuz, Derya; PARK, JONGEE; Öztürk, Abdullah (2015-12-01) The effects of initial water content and calcination temperature on sol gel synthesized TiO2 powders were studied. Mother solutions had water/Ti-precursor mole ratios (R ratio) of 1, 5, 10, and 50. Dried aerogels were calcined for 3 h at temperatures of 300, 400, and 500 degrees C to obtain crystallized TiO2 nanopowders in the range of 15-30 nm. PE-scanning electron microscopy and X-ray diffraction techniques were employed to investigate the morphological and structural properties of the nanopowders synthes...
Effects of pH, Initiator, Scavenger, and Surfactant on the Ozonation Mechanism of an Azo Dye (Acid Red-151) in a Batch Reactor Oezbelge, Tuelay A.; Erol, Funda (Informa UK Limited, 2009-01-01) In this study, an initiator (Fe2+) and a scavenger (CO32(-)) were used at different concentrations in a batch reactor to investigate the reaction mechanism of ozonation of a model azo dye, namely Acid Red-151 (AR-151). Also, the effect of a nonionic surfactant known as a major pollutant in many industrial wastewaters, namely polyethylene glycol (PEG), was observed on the degradation rate of AR-151. The experimental parameters and their ranges were: pH (2.5-10), initiator (0.8-50mg/L of Fe2+), surfactant (10...
Influence of the sol-gel preparation method on the photocatalytic NO oxidation performance of TiO2/Al2O3 binary oxides Polat, Meryem; Soylu, Asli M.; Altunöz Erdoğan, Deniz; Erguven, Huseyin; Vovk, Evgeny I.; Ozensoy, Emrah (2015-03-01) In the current work, TiO2/Al2O3 binary oxide photocatalysts were synthesized via two different sol-gel protocols (P1 and P2), where various TiO2 to Al2O3 mole ratios (0.5 and 1.0) and calcination temperatures (150-1000 degrees C) were utilized in the synthesis. Structural characterization of the synthesized binary oxide photocatalysts was also performed via BET surface area analysis, X-ray diffraction (XRD) and Raman spectroscopy. The photocatalytic NO(g) oxidation performances of these binary oxides were m...
EFFECT OF ION ASSOCIATION ON THE PROPERTIES OF IONOMERS OBTAINED FROM METHYL-METHACRYLATE METHACRYLIC-ACID COPOLYMER KOCAK, HI; ARAS, L (Elsevier BV, 1990-07-01) The solution behaviour of Na, Ba, Zn and Al ionomers of methyl methacrylate-methacrylic acid copolymer (P(MMA-MAA)) with different ion contents has been studied by viscosity and dipole moment measurements. Two solvents with different character are chosen for viscosity measurements: dioxane (ε = 2.22) and acetone (ε = 20.7). The expected polyelectrolyte behaviour of the ionomers in acetone is reflected by the viscometric measurements. Mean squared dipole moment 〈μ2〉 values are calculated over a temperature r...
Effect of Drying Conditions on the Characteristics and Performance of B/Fe2O3 Nano-Composites Prepared by Sol-Gel Method Yilmaz, Nil Ezgi Dincer; Karakaş, Gürkan (2020-01-01) B/Fe2O3 samples were prepared by mixing nano sized boron powder with iron oxide xerogels that had been synthesized using a sol-gel method that included various types of proton scavengers such as 1,2-epoxybutane, tetrahydrofuran, 1,4-dioxane and ammonium hydroxide. The effects of the proton scavengers and drying conditions on the textural properties of the iron oxide samples and on the heat output and thermal behavior of the nano-composites were examined. The iron oxide samples were subjected to direct dryin...

Citation Formats

O. Kahraman, “Effect of ZnO morphology on photocatalytic activity determined by no oxidation,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Chemical Engineering., Middle East Technical University, 2019.