Preparation Of Nano - Cuprous Oxide By Green Liquid Phase And Its Optical Properties

Nanomaterials have attracted more and more attention because of its physical and chemical properties, which are different from macroscopic materials. As a typical p-type direct band gap semiconductor with a band gap of 2.10-2.17eV, Cu2O is the rare one material which can be catalyzed by sunlight. Besides, Gu2O has some characteristics such as non-toxic, low energy consumption, low cost and so on. The preparation methods of Cu2O and its applications have become the topic of current research in recent years.In this paper, a green and simple solution-phase method was successfully used to prepared cuprous oxide nanomaterials. X-ray power diffraction (XRD), Energy Dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and UV-Vis spectroscopy (UV-Vis) were used to characterize the obtained product, when the product was collected from solutions. The main content is as follows:1. In this method, the cuprous oxide was prepared through the chemical reduction of copper acetate by fructose in the presence of ethylene glycol under the water bath at 60℃. The reddish brown precipitate was collected lh later. The results showed that, the product was uniform and well dispersed spheres with the average diameter of 500nm. The influence of time, temperature and the solvent on the formation of cuprous oxide was investigated. The growth process of cuprous oxide was analyzed and the mechanism of crystal growth was proposed. The result of UV-vis showed that the obtained Cu2O had a broad peak centered at 504nm. The photocatalytic activity of degradation of methyl orange (MO) under visible light irradiation was investigated. It found that the product had efficient catalytic for degradation MO, the photodegradation of which reached 85% and can be used in wastewater treatment.2. In this method, the silicon substrates were adhered to the bottom of the beaker which was used as the reaction vessel. The copper acetate was reduced by ascorbic acid in the presence of ethylene glycol and de-ionized water at room temperature. After stirring for 1 h, the mixture was put aside for another 1 h. the Cu2O films were deposited on the polished side of silicon substrates. The results showed that, the film consist of nanoparticles with the size of 300nm, the thickness of which is about 1.7um. The result of UV-vis shows that the obtained film has a broad peak centered at 515nm. The photocatalytic activity of degradation of methyl orange (MO) of the obtained Cu2O films, H2O2 and H2O2/Cu2O films system under visible light irradiation was also investigated. The results showed that the system exhibit high catalytic ability under the visible light irradiation. Besides, there was a strong synergy effect between the obtained Cu2O films and H2O2 when the system was used to degrade the methyl orange and the degradation rate reached 100%.3. Under the condition of ultrasonic, copper acetate was reduced by fructose in different solutions (ethylene glycol and de-ionized water was mixed in different proportions). The reddish brown precipitate was collected 15min later. The results showed that, the products were uniform and well dispersed octahedral and its different truncated forms with the average diameter of 500nm. The influence of time on the formation of cuprous oxide was investigated. The growth process of cuprous oxides was analyzed and the mechanism of crystal growth was proposed. The result of UV-vis showed that the obtained octahedral Cu2O had a broad peak centered at 530 nm, the small-truncated octahedral Cu2O nanocrystal had a broad peak centered at 588 nm and the large-truncated octahedral Cu2O nanocrystal had a broad peak center at 565 nm.