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Photocatalysis Study of Cu2 O/TiO2 Composite Film Prepared by Direct Current Reactive Magnetron Sputtering

Author: LiuCan
Tutor: WeiZiDong
School: Chongqing University
Course: Inorganic Chemistry
Keywords: Magnetron Sputtering Cu2O TiO2 Composite Film Photocatalysis
CLC: O643.36
Type: Master's thesis
Year: 2011
Downloads: 56
Quote: 0
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Abstract


Photocatalysis of semi-conductor oxides has become one of the most potential fields in recent years. TiO2 was widely applied in photocatalysis owe to its non-toxic, stability, low price and thoroughly degradating in organic. However, as a kind of N-type semi-conductor with wide forbidden band gap, TiO2 could only be excited by UV,which diminished the utilization of sunlight. Moreover, the rapid combination of hole and electron results in poor efficiency of photocatalysis. Plenty of studies have proved that combinating TiO2 with some narrow band gap semi-conductor could not only improve the separation of electron and hole, but also increase usage of sunlight because the different position of CB and VB in the two semi-conductors. Cu2O is a nonstoichoimetric p-type semiconductor, major attraction of cuprous oxide is that it is inexpensive, non-toxic, readily available, and which has a direct forbidden bandgap of about 2.2 eV and a highly optical absorption coefficient.TiO2/Cu2O composite films were deposited on slide glass by direct current （DC） reactive magnetron sputtering with parameter gradually optimizing in this paper. Energy-dispersive spectrometry （EDS）, X-ray diffraction （XRD） and scanning electron microscopy （SEM） were applied to characterize composition, structure and morphology of the films respectively. Photocatalytic activity was evaluated by the degradation of methylene blue （MB） with xenon lamp; the XRD showed that the crystal of Cu2O existed preferred growth during sputtering, it was proved that the different crystal face exhibits different catalytic ability, （111） was better than （110） and （220）. Therefore, the sputtering time should be controlled in 5min. The experimental results showed that the photocatalytic degradation activity of MB for the Cu2O/TiO2 series increased with increasing Cu2O-deposited content, and then decreased when the content of TiO2 was constant. The best film was obtained for Cu2O（2.6%）/TiO2 and the degradation achieved 73.6% in 60 minutes in our experiment. The two oxidations can’t form composite completely with sufficiently Cu2O, and excess Cu2O deposited on TiO2 will prolong the transferring path of the electrons and holes, and which would reduce the quantum efficiency. The experiment of varing different gas value has proved that the effect is better in atmosphere of air than N2, which is attributed to the increasing lifetime of the charge carrier; The influence of different initial pH appears more obvious, because the base circumstance is advantageous in OH generating, and make MB be prone to adsorption and the hole transfer to surface of film easily, which was responsible for the differences in photocatalytic activity. The degradation of MB was 97.4% at pH=12 in 60 minutes.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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