Fabrication and Photocatalytic Properties of Ce-La-Ag Co-doped TiO2/Basalt Fiber Composite Photocatalyst

doi:10.11901/1005.3093.2018.588

Chinese Journal of Materials Research

2019, Vol. 33

Issue (7): 515-522 DOI: 10.11901/1005.3093.2018.588

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Fabrication and Photocatalytic Properties of Ce-La-Ag Co-doped TiO₂/Basalt Fiber Composite Photocatalyst

Zishang CHEN¹,Xiaoping LIANG¹(

),Xiaowei FAN¹,Jun WANG¹,Anding HUANG¹,Zhifeng LIU²(

)

1. State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China
2. School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China

Cite this article:

Zishang CHEN,Xiaoping LIANG,Xiaowei FAN,Jun WANG,Anding HUANG,Zhifeng LIU. Fabrication and Photocatalytic Properties of Ce-La-Ag Co-doped TiO₂/Basalt Fiber Composite Photocatalyst. Chinese Journal of Materials Research, 2019, 33(7): 515-522.

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Abstract

The composite photocatalyst of Ce-La-Ag-TiO₂/BF (basalt fiber) was prepared by coating the Ce-La-Ag co-doped TiO₂ onto BF via sol-gel method. The effect of the calcination temperature of the composite photocatalyst and the pH value of wastewater on the photocatalytic activity of these photocatalysts was evaluated by examining the degradation rate of ammonia-nitrogen wastewater. The results show that the coupling effect of Ce-La ion and Ag nanoparticles results in the decreases of the band gap of TiO₂ from 3.2 eV to 2.15 eV, with a photocatalytic activity obviously higher than those of the pure TiO₂, Ce-La-TiO₂ and Ag-TiO₂. Moreover, the catalytic activity of Ce-La-Ag-TiO₂ is further improved after being deposited onto BF. When the calcination temperature for the Ce-La-Ag-TiO₂, pH of wastewater and irradiating time of simulate visible light are 600^oC, 10.5 and 360 min, respectively, the resulted degradation rate of ammonia nitrogen wastewater can still reach above 88.2% after repeated use of the composite photocatalyst for five times.

Key words: Inorganic non-metallic materials TiO₂ composite photocatalyst rare earth and noble metal co-doped basalt fiber ammonia nitrogen wastewater degradation

Received: 27 September 2018

ZTFLH:	O643.36
	O644.1

Fund: Program for Innovative Research Team in University of Ministry of Education of China(IRT-17R80);the Funds for Creative Research Groups of Tianjin(17JCJQJC44800)

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	Zishang CHEN
	Xiaoping LIANG
	Xiaowei FAN
	Jun WANG
	Anding HUANG
	Zhifeng LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.588 OR https://www.cjmr.org/EN/Y2019/V33/I7/515

Fig.1 XRD patterns of the photocatalysts

Fig.2 XPS patterns of Ce-La-Ag-TiO₂ photocatalysts (a) survey spectra, (b) Ag3d, (c) Ce3d, (d) La3d

Fig.3 UV-visible absorption spectra (a) and the band gap energy (b) of photocatalysts (1) Pure TiO_2, (2) Ag-TiO_2, (3) Ce-La-TiO₂, (4) Ce-La-Ag-TiO₂

Fig.4 Ammonia nitrogen degradation efficiency of all the prepared the photocatalysts

Fig.5 SEM and TEM images of the substrate (a) and photocatalysts (b, c)

Fig.6 Ammonia nitrogen concentration for Ce-La-Ag-TiO₂/BF at different sintering temperatures (a) and different wastewater pH values (b)

Fig.7 Recycling test of Ce-La-Ag-TiO₂/BF for photocatalytic degradation of Ammonia nitrogen

Fig.8 Transient photocurrent response of different photocatalysts

Fig.9 Electrochemical impedance spectroscopy of different photocatalyst

Fig.10 Reaction mechanism of photocatalytic degradation of ammonia nitrogen by Ce-La-Ag-TiO₂/BF

Fig.11 Concentration curves of the NH₄⁺-N and degradation products during the process by Ce-La-Ag-TiO₂/BF

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