Caixia Feng

Name: 冯彩霞; CaiXia Feng

Organization: Henan University , China

Department: Institute of Environmental and Analytical Sciences

Title: Associate Professor(PhD)

Chemicals
References

Opposite effect of photocorrosion on photocatalytic performance among various AgxMyOz/TiO2 (M = C, P) photocatalysts: A novel effective method for preparing Ag/TiO2 composite

Co-reporter:Caixia Feng, Yuhua Pang, Yan Wang, Mingming Sun, Chenyan Zhang, Ling Zhang, Yanmei Zhou, Deliang Li

Applied Surface Science 2016 Volume 376() pp:188-198

Publication Date(Web):15 July 2016

DOI:10.1016/j.apsusc.2016.03.142

Highlights

•: Extremely opposite effect on activity of various Ag_xM_yO_z/TiO₂ was observed.
•: Both Ag₂CO₃/TiO₂ and Ag₂C₂O₄/TiO₂ stand photocorrosion but still show high activity.
•: Ag₃PO₄/TiO₂ partially undergoes photocorrosion but largely reduces its activity.
•: The photocorrosion of Ag₂CO₃/TiO₂ can be used to prepare Ag/TiO₂ effectively.

Visible light photocatalytic behavior of manganese carbonate/titanium dioxide nanocomposites based on photoinduced interfacial charge transfer

Co-reporter:Caixia Feng, Xianshun Huang, Yan Wang, Mingming Sun, Deliang Li

Materials Letters 2015 Volume 155() pp:23-26

Publication Date(Web):15 September 2015

DOI:10.1016/j.matlet.2015.04.108

•MnCO3/TiO2 heterostructures was prepared via a precipitation method.•MnCO3/TiO2 shows high and stable visible light photocatalytic activity.•The interaction by the aid of oxygen-bridge between MnCO3 and TiO2 is proposed.•The interfacial charge transfer from MnCO3 to TiO2 is the key to the activity.Here, a novel visible-light-driven photocatalyst MnCO3/TiO2 heterostructure nanocomposite has been prepared via a precipitation method. The synthesized MnCO3/TiO2 exhibited superior activity for the degradation of propylene under visible light compared to bare P25 TiO2 and pure MnCO3. This high visible light activity is due to the interfacial charge transfer (IFCT) from the MnCO3 to the conduction band of TiO2. After repeated cycles of photo-oxidation of propylene, the photocatalytic behavior of MnCO3/TiO2 exhibited no loss of activity. This work provides new perspective to fabricate visible-light-active photocatalyst by use of IFCT effect between carbonate and semiconductor.

Unusual photo-induced adsorption–desorption behavior of propylene on Ag/TiO2 nanotube under visible light irradiation

Co-reporter:Caixia Feng, Jingwei Zhang, Rui Lang, Zhensheng Jin, Zhishen Wu, Zhijun Zhang

Applied Surface Science 2011 Volume 257(Issue 6) pp:1864-1870

Publication Date(Web):1 January 2011

DOI:10.1016/j.apsusc.2010.09.004

Abstract

Titanium dioxide (TiO₂) nanotube with a large amount of single-electron-trapped-oxygen-vacancies (coded as T2) was obtained by annealing nanotube H₂Ti₂O₄(OH)₂ (coded as T1) at 400 °C in air. Silver nanoparticles with a diameter of about 30–50 nm were loaded onto the surface of T2 via deposition associated with photochemical reduction under ultraviolet irradiation. The resulting Ag/TiO₂ nanotube (coded as T3) was characterized by means of transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and ultraviolet–visible light diffusion reflectance spectrometry. It was found that C₃H₆ experienced unusual photo-induced adsorption–desorption on T3 under visible light irradiation. Namely, C₃H₆ was initially desorbed from T3 and then adsorbed on T3 under visible light irradiation. On the contrary, C₃H₆ was initially adsorbed on T3 in the dark, followed by desorption. The reason might lie in that two kinds of active sites exist on the surface of T3, corresponding to quite different rates of adsorption and desorption. It was found that oxygen vacancies in association with deposited silver particles, were responsible for the alternative adsorption–desorption of C₃H₆ on T3.

Coaction of Sub-band and Doped Nitrogen on Visible Light Photoactivity of N-Doped TiO2

Co-reporter:Caixia Feng;Zhensheng Jin;Jingwei Zhang;Zhishen Wu;Zhijun Zhang

Photochemistry and Photobiology 2010 Volume 86( Issue 6) pp:1222-1229

Publication Date(Web):

DOI:10.1111/j.1751-1097.2010.00808.x

Abstract

We found in our previous work that the high photoactivity of N-doped TiO₂ for the oxidation of propylene under visible light was attributed to the photoactive center V_o^•-NO-Ti and the formation of sub-band originated from a large amount of single-electron-trapped oxygen vacancies (denoted as V_o^•; C. X. Feng, Y. Wang, Z. S. Jin, J. W. Zhang, S. L. Zhang, Z. S. Wu, Z. J. Zhang [2008], New J. Chem. 32, 1038). In the present study, the structure of the sub-band within E_g of a representative sample N-NTA-400 was investigated by means of photoluminescence (PL) spectrometry and ultraviolet-visible light-near infrared diffuse reflectance spectra. The coaction of the sub-band and doped nitrogen on visible light photocatalytic activity of N-doped TiO₂ was also investigated. The electron spin resonance spectra measured under laser irradiation (λ = 532 nm) indicate that the doped nitrogen may contribute to stabilize the trapping electron center, i.e. surface oxygen vacancy (V_o^••), and hence suppress the PL, enhancing the photocatalytic activity.

CAS:1031883-22-3

CAS:51142-87-1

Sodium titanium oxide

Silver, [m-[ethanedioato(2-)-kO1,kO2':kO1',kO2]]di-

CAS:533-51-7

Silver, [m-[ethanedioato(2-)-kO1,kO2':kO1',kO2]]di-

CAS:20338-08-3

Titanium hydroxide(Ti(OH)4), (T-4)-