Synthesis and Photocatalytic Performance of CdS/CuS Core-shell Nanocomposites†

doi:10.7503/cjcu20180596

Abstract

Abstract:

Four CdS/CuS core-shell nanocomposite samples with different molar ratios of CdS to CuS were synthesized via liquid-phase thermal decomposition and ion adsorption method under different crystallization time of CdS, using cadmium acetate, 2-mercaptobenzothiazole, sodium sulfide and cupric chloride as the raw materials. The experimental results indicated that the samples were spherical nucleus-like structures and their particle size was controllable with the crystallization time of CdS. The degradation efficiencies of rhodamine B(RhB) and methylene blue(MB) both reached about 99% when the molar ratio of CdS to CuS was 4∶1 and the crystallization time of CdS was 10 min. The method of ion adsorption makes CuS fully coat on the surface of CdS, forming effective core-shell structure and obviously improving the photocatalytic performance of CdS.

Key words: CdS/CuS, Nanocomposite, Photocatalysis, Degradation efficiency

CLC Number:

O644
O613.51

TrendMD:

ZHANG Kejie,LI Yu,XIA Yuan,HAN Shuo,CAO Jing,WANG Hanyang,LUO Wentao,ZHOU Zhiping. Synthesis and Photocatalytic Performance of CdS/CuS Core-shell Nanocomposites^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 489.

Figures/Tables 12

Fig.1 XRD patterns of CdS/CuS samples(A) a. CdS(10 min)/CuS(3∶1); b. CdS(10 min)/CuS(4∶1); c. CdS(10 min)/CuS(5∶1);d. CdS(1 h)/CuS(4∶1). (B) CdS(10 min)/CuS(4∶1).

Fig.2 XPS spectra of CdS(10 min)/CuS(4∶1)(a), CdS(10 min)/CuS(3∶1)(b) and pure CdS(c)(A) Full spectrum; (B) Cd3d; (C) S2p; (D) Cu2p.

Fig.3 SEM images of different CdS/CuS samples(A) CdS(10 min)/CuS(4∶1); (B) CdS(1 h)/CuS(4∶1); (C) CdS(10 min)/CuS(5∶1); (D) CdS(10 min)/CuS(3∶1).

Fig.4 TEM(A) and HRTEM(B) images of CdS(10 min)/CuS(4∶1)

Fig.5 UV-Vis DRS spectra(A) and corresponding Tauc’s plots(B) of different samples

Fig.6 c/c0-t(A) and -ln(c/c0)-t(B) plots of RhB in the presence of different photocatalysts

Fig.7 c/c0-t(A) and -ln(c/c0)-t(B) plots of MB in the presence of different photocatalysts

Fig.8 c/c0-t(A) and -ln(c/c0)-t(B) plots of MO in the presence of CdS(10 min)/CuS(4∶1)

Fig.9 Degradation profiles of different dyes in the presence of different photocatalysts(A) and the photocatalytic efficiency of different photocatalysts for different dyes within 35 min(B)(A)CdS(1 h)/CuS(4∶1), MB;CdS(10 min)/CuS(3∶1), RhB; CdS(10 min)/CuS(5∶1), RhB;CdS(10 min)/CuS(4∶1), RhB;CdS(10 min)/CuS(4∶1), MB. (B) a. CdS(10 min)/CuS(3∶1), RhB; b. CdS(10 min)/CuS(5∶1), RhB; c. CdS(10 min)/CuS(4∶1), RhB; d. CdS(10 min)/CuS(4∶1), MB; e. CdS(1 h)/CuS(4∶1), MB.

Table 1 Kinetic equation of dyes degradation by different photocatalysts

Sample	Dye	First-order kinetic equation	R²
CdS(10 min)/CuS(3∶1)	RhB	-ln(c/c₀)=0.081t+1.437	0.878
CdS(10 min)/CuS(4∶1)	RhB	-ln(c/c₀)=0.157t+0.757	0.998
CdS(10 min)/CuS(5∶1)	RhB	-ln(c/c₀)=0.025t+2.489	0.995
CdS(10 min)/CuS(4∶1)	MB	-ln(c/c₀)=0.115t+1.871	0.954
CdS(1 h)/CuS(4∶1)	MB	-ln(c/c₀)=0.020t+0.488	0.947

Scheme 1 Preparation of CdS/CuS core-shell composites by using Cd(MBT)2 as the precursor

Fig.10 Schematic presentation of the photocatalytic mechanism in the CdS/CuS system under light illumination

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