International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
The effect of size of the CuO Nano leaves on the sunlight driven Photocatalytic properties S.Muthurani1, D.Prem Anand2 1,2 Department
of Physics, St.Xavier’s College, Tirunelveli-627002, Tamilnadu, India Corresponding author mail id: dpremanand@yahoo.co.in ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Copper oxide nano leaves were synthesized using surfactant assistant wet chemical method. Using various concentration of Polyvinyl pyrrolidone (PVP) as surfactant, four copper oxide nano materials were synthesized. Crystalline nature, crystallite size of CuO materials were studied using X-ray Diffraction pattern. Nano leaves morphology of the materials was confirmed by scanning electron microscope. Sunlight driven photo catalytic properties of the materials have been studied using Congo red as a model contaminant.
2. MATERIALS AND METHODS
Cupric nitrate trihydrate [Cu(NO3)2·3H2O] (Himedia 99.5% purity), PVP K30 (M.W= 40,000) (Himedia )and sodium hydroxide pellets [NaOH] (Nice chemicals) are the chemicals used in this experiment. They were analytical reagent grade and used without further purification. Copper oxide was prepared by surfactant assistant wet chemical method. 0.1M of cupric nitrate solution and 0.2 M of NaOH solutions were made separately using deionized water. With the blue colored cupric nitrate solution, PVP was added and allowed to stir with warm heat until it dissolved. Freshly prepared sodium hydroxide solution was added drop by drop with continuous stirring until the solution pH reached to 11. Meanwhile, the continuous addition of NaOH solution changed the blue color solution to greenish blue precipitation and then it turned into black. The precipitation was then washed several times by distilled water and ethanol using suction funnel. Washed samples were dried at room temperature for 24 hrs. Then it was kept in oven at 120° C for 10 hrs. Following the above procedure using different concentration of PVP such that 0.005M, 0.01 M, 0.05M and 0.1 M was added and four samples were synthesized and named as PVP (0.005), PVP (0.01), PVP (0.05), and PVP (0.1) respectively.
Key words: Copper oxide, PVP, Photocatalytic, Congo red, sunlight
1. INTRODUCTION: Our water resources contaminated by the waste water released by many industries like textile industry, leather industry, hair-colouring industry, food industry, paper industry etc. More than 10000 different commercial dyes and pigments exist and 700000 tons are produced per year worldwide [1]. During the process in the industries, the excess dyes are made to lost in water resources and pollute the water. The harmfulness of the dyes creates the necessity to do the removal process. On the basis of SciFinder data source Malka etal [2] told in his review paper, 50% to 70% of the dye production in global is azo dyes but the manuscripts on the removal of azo dyes in the presence of visible light are low. Most of the semiconductor oxides studied for their catalytic properties but colored semiconducting oxides have capability to expand the wavelength absorption in visible region [3]. CuO is favorable cause its ease of preparation, non-toxic and stability. Considering all these factors, in the present work CuO nano leaves were synthesized and utilized as a nano catalyst for the removal of azo dye (Congo red) in the presence of sunlight. The CuO has been published as a good photo catalyst in many reports, [4-9] but photo catalytic properties for the degradation of organic dyes directly related to synthesis technique, particle shape and size. In the present case Copper oxide nano leaves were synthesized by simple wet chemical method using PVP K30 as surfactant
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2.1 characterizations The XRD pattern was recorded by XPERT-PRO diffractometer using Cu-Kα radiation (λ=1.54 Ǻ) in order to confirm the crystalline nature and to determine the phase present in the prepared materials. FTIR spectrum was recorded by KBr pellet technique from 400cm-1 to 4000 cm-1 using spectrum RXI Perkin Elmer spectrometer SEM analysis was carried out using scanning electron microscope Carl Zeiss EVO 18 at 25KX magnification. UV-visible absorbtion spectrum was recorded using. Lamda 35 Perkin Elmer spectrophotometer. 2.2 Photo catalytic experiment Photo catalytic properties synthesized CuO nanomaterials were studied using the degradation of Congo red dye under the sunlight. The experiment was carried out from 10.30 am
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