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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Physical Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: TiO2,Photocatalysis,precipitation,Mesoporous,Anatase,Template
- چکیده:
- چکیده انگلیسی: For the first time, a facile method is introduced to obtain ultrathin, mesoporous TiO2 nanosheets by the alkali precipitation of aqueous TiCl3 in the presence of NH4OH, and in-situ templating with polyvinyl alcohol (PVA). The synthesized titania have been characterized by N2 adsorption-desorption measurements, x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermo-gravimetric analysis (TGA) and ultraviolet-visible (UV-vis) spectroscopy. The obtained titania were hexagonal-like, detached, non-agglomerated, polydispersed, sub-20 nm nanodiscs. Unlike in doping methods, their surface area and pore volumes of can easily be tailored devoid of any wavelength shift, by simply tuning the amount of the template. Accordingly, their aggregation as microspheres can successfully be controlled by the templating step. The remarkable photoactivity of these nanoscopic materials has been confirmed by the degradation of aqueous methyl orange.
- انتشار مقاله: 15-09-1398
- نویسندگان: Abubakar Hamisu,Umar Gaya,Abdul Halim Abdullah
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Journal of Green Chemistry
- نوع مقاله: Journal Article
- کلمات کلیدی: Methyl orange,Photodegradation,ZnO doped CuO,UV light
- چکیده:
- چکیده انگلیسی: Zinc oxide (ZnO) and copper oxide doped zinc oxide photocatalysts (CuO/ZnO) were synthesized by precipitation method. The effect of CuO loading on the physicochemical properties and photocatalytic performance of ZnO in photodegrading methyl orange dye solution (MO) was investigated. The produced ZnO has a crystallite size of 61.1 nm, surface area of 4.43 nm2/g and band gap energy of 3.30 eV. After doping with 0.8% CuO, the crystallite size decreased to 19.4 nm while the surface area increased to 8.2 mm2/g. The band gap energy, however, remained the same indicating that low CuO content did not affect the optical properties of ZnO. The efficiency of the photocatalystsin photodegrading MO was evaluated under different conditions. Photocatalytic activities showed that the highest removal of 54.1% was achieved when 5 ppm of MO solution was degraded by 0.6 g of 0.8% CuO/ZnO at pH 6.8. The response surface methodology (RSM) was employed to develop a quadratic model as a functional relationship between the amounts of the degraded MO (mg/g) and three experimental factors (mass loading, MO initial concentration and MO initial pH). The highest amount of the degraded MO was 12.8 mg/g when 0.2 g of 0.8% CuO doped ZnO was used in 5 ppm MO at pH 5.
- انتشار مقاله: 07-04-1397
- نویسندگان: Siti Nur Surhayani Jefri,Abdul Halim Abdullah,Ernee Noryana Muhamad
- مشاهده