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Preparation Of Photocatalytic Titanium Dioxide Powders Using Sol-Gel Process For Water Treatment

Oluşturulma Tarihi: 19-02-2018

Niteleme Bilgileri

Tür: Tez

Alt Tür: Yüksek Lisans Tezi

Yayınlanma Durumu: Yayınlanmamış

Dosya Biçimi: PDF

Dil: İngilizce

Konu(lar): TEKNOLOJİ, Mühendislik malzemeleri, metreler, vb.,

Yazar(lar): Mohammed, Ahmed Hafedh Mohammed (Yazar),

Emeği Geçen(ler): Park, Jongee (Danışman),

Anahtar Kelimeler

TiO2, sol-gel process, acid effect, pH effect, photocatalyst.


Özet

This work was in an elaboration of TiO2 nanoparticles by the sol-gel process using tetra-isopropoxide as a precursor to get higher photocatalytic activity. In sol-gel method, the effects of different acids (Acetic acid, Hydrochloric acid, and Nitric acid) and different (pH) with using Hydrochloric acid as a catalyst: (pH 1.5, 2.8, 3.3 and 4) were studied. Using one of the samples synthesized, the effect of calcination temperature on the properties of synthesized TiO2 was investigated at various temperatures 450, 550, and 650 ºC. All the samples calcined at 550 ºC were characterized using XRD, SEM, and UV – Vis spectrophotometer. The titanium dioxide solution prepared by using hydrochloric acid at pH 4 was coated on a glass substrate, using dip coating technique for different cycles (1 time, 3 times, and 5 times). All coated glass of TiO2 were analyzed using UV-Vis spectrometry, UV-Vis spectrophotometer, and contact angle measurements. The results showed that only anatase phase with different crystallite size, crystallinity, and shapes of TiO2 was obtained in different kinds of acid, and the formation mechanism of TiO2 by different acid was discussed in detail. For different pH, at pH 4, 2.8, and 1.5, only the anatase type TiO2 was observed. Under acidic condition at pH 3.3, anatase and very small amount of rutile were obtained. In addition, it was shown that the crystallinity and crystallite size of anatase type TiO2 were increased when calcination temperature increased. The TiO2 powder synthesized from hydrochloric acid at pH 4 showed highest photocatalytic activity, and its photodegradation efficiency was 76.2%, 95%, and 98.1% in 30, 60, and 90 min, respectively, for methylene blue under UVvirradiation. Finally, the glass coated 5 times with TiO2 sol showed superhydrophilicity and its photodegradation efficiency was 67 % in 7 h under UV irradiation.


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