Preparation and Photocatalytic Activity of Fe-Doped Hydroxyl-Zr Pillared Titanate†

doi:10.7503/cjcu20150280

Abstract

Abstract:

To fabricate Fe-doped-hydroxyl-Zr pillared titanate(abbreviated as FZPT) with delaminated structure, the exfoliated layered titanate in aqueous solution was reassembled in the presence of hydroxyl-Zr oligocations and iron cation under the exfoliation-restacking route to induce a great number of mesopores and eventually a large surface area of photocatalysts. The influence of doping iron cations on the preparation and catalytic activity of the Zr-pillared composites(ZPT) was investigated. The material was characterized by powder X-ray diffraction, UV-Vis DRS spectra, scanning electron microscopy(SEM), transmission electron microscopy(TEM), and specific surface area and porosity measurements. When n(Fe)/n(Zr) in FZPT was less than 10%, the diameter of mesopore and specific surface area increased with the amount of iron, and vice versa. The results of degradation of methylene blue(MB) under ultraviolet and visible radiation showed that the FZPT nanocomposites exhibited higher photocatalytic activities than ZPT, which was based on the mesoporous structure and increased specific surface area. The FZPT-0.20 nanocomposite exhibited an enhanced photocatalytic activity in the degradation of MB under visible-light irradiation, attributed to the electronic coupling between the host and the guest cations contained iron.

Key words: Pillared material, Titanate nanosheet, Iron-doping, Exfoliation-restacking, Photocatalytic property

CLC Number:

TrendMD:

HE Liwen, LIN Bizhou, ZHANG Guohua, YAO Qianru. Preparation and Photocatalytic Activity of Fe-Doped Hydroxyl-Zr Pillared Titanate^†[J]. Chem. J. Chinese Universities, 2015, 36(10): 1984.

Figures/Tables 8

Schematic illustration of the exfoliation-restacking route to prepare titanate composites

Fig.1 Powder XRD patterns for layered cesium titanate(a), layered protonic titanate(b), ZPT-5(c), FZPT-0.05(d), FZPT-0.10(e) and FZPT-0.20(f)

Table 1 Parameters obtained from N2 adsorption-desorption measurements

Sample^a	Surface area^b/(m²·g^-1)	Pore volume^c/(mL·g^-1)	Average pore size^d/nm
Cs_xTi_2-_x_/4□_x_/4O₄	~1
ZPT-5	63	0.29	3.83
FZPT-0.05	64	0.30	4.36
FZPT-0.10	99	0.31	3.83
FZPT-0.20	89	0.26	3.73

Fig.2 SEM(A) and HRTEM(B) images of FZPT-0.10

Fig.3 Origin of mesoporous structure in FZPT nanocomposites

Fig.4 N2 adsorption-desorption isotherms and pore size distributions(inset) of FZPT-0.05(a), FZPT-0.10(b) and FZPT-0.20(c)

Fig.5 UV-Vis diffuse reflectance spectra(A) and [F(R)·hν]0.5-hν curves(B) of FZPT-0.05(a), FZPT-0.10(b) and FZPT-0.20(c)

Fig.6 Photodegradation of methylene blue under UV-light and visible-light irradiation catalyzed by layered protonic titanate(a), ZPT-5(b), FZPT-0.05(c), FZPT-0.10(d) and FZPT-0.20(e)

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