Alkaline-assisted Hydrothermal Fabrication of CdZnS with Enhanced Visible-light Photocatalytic Performance†

doi:10.7503/cjcu20150142

Abstract

Abstract:

A series of visible-light photocatalysts, CdZnS[CZS-r, r=n(NaOH)/2n(Cd²⁺+Zn²⁺)] solid solution, was fabricated by alkaline-assisted hydrothermal method. The crystal structure, microstructure and band gap energy(E_g) of the as-synthesized crystals were characterized by multiple techniques including powder X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), Brunauer-Emmett-Teller(BET) surface area analysis and solid-state UV-Vis diffuse reflectance spectra(UV-Vis DRS). The results showed that alkaline-assisted method can significantly lower the size of the crystals, improve the dispersibility of the particles, enlarge the specific surface area of the semiconductors and introduce the stacking faults. Additionally, the photocatalytic properties of the CzS-r samples were evaluated by hydrogen generation under the irradiation of visible light(λ≥420 nm). It has been found that CZS-0.5 possessed the 5 h average hydrogen production rate of 2154 μmol/(h·g), 29.92 times that of CZS-0[72 μmol/(h·g)], which is mainly ascribed to the unique potential provided by the stacking faults.

Key words: Alkaline-assisted hydrothermal method, CdZnS, Visible-light photocatalyst, Hydrogen production

CLC Number:

O643.3

TrendMD:

LU Yonghong, WU Pingxiao, HUANG Junyi, TRAN Lytuong, ZHU Nengwu, DANG Zhi. Alkaline-assisted Hydrothermal Fabrication of CdZnS with Enhanced Visible-light Photocatalytic Performance^†[J]. Chem. J. Chinese Universities, 2015, 36(8): 1563.

Figures/Tables 8

Fig.1 XRD patterns of CZS-r

Table 1 Effect of alkali dosage on the physicochemical properties and hydrogen production rates of the samples

Sample	Crystalline size/nm	S_BET/(m²·g^-1)	Average pore size/nm	Band-gap energy/eV	Rate of H₂ evolution/ (μmol·h^-1·g^-1)
CZS-0	25.95	0.437		2.23	72
CZS-0.5	8.28	38.990	22.8	2.26	2154
CZS-1.0	8.25	68.020	22.2	2.31	1674
CZS-1.5	7.90	78.833	18.9	2.29	1390
CZS-2.0	9.14	90.797	14.0	2.36	1788

Fig.2 FESEM images of CZS-0(A), CZS-0.5(B), CZS-1.0(C), CZS-1.5(D),CZS-2.0(E) and EDS spectrum of CZS-0.5(F)The insets show the circled part of the corresponding sample with high magnification.

Fig.3 TEM(A, B) and HRTEM(C, D) images of CZS-0(A, C) and CZS-0.5(B, D)

Fig.4 TEM(A—C) and HRTEM(D—F) images of CZS-1.0(A, D), CZS-1.5(B, E) and CZS-2.0(C, F)

Fig.5 N2 adsorption-desorption isotherms(A) and pore size distribution(B) of CZS-r

Fig.6 UV-Vis DRS spectra of CZS-r

Fig.7 Comparison of the photocatalytic hydrogen evolution over CZS-r under visible-light irradiation(A) and photocatalytic H2 generation over CZS-0.5 during the first three cycles(B)

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