Visible-light Photocatalytic Degradation Effect of Sn-Contained Layered Double Hydroxides on 4-Chlorophenol

doi:10.15541/jim20150233

Abstract

Abstract:

With excellent structural characteristics of layered double hydroxides (LDHs), the high photocatalytic properties of Sn-contained LDHs were synthesized by introducing Sn with photocatalytic activity into the brucite type layers. The obtained LDHs solids were characterized by powder X-ray diffraction (XRD), Fourier transform infrared spectrometer (FTIR), ultraviolet visible diffuse reflectance spectroscopy (UV-Vis DRS) and Brunauer Emmett Teller (BET) surface area analysis, confirming the crystalline phase, molecular structure, photoresponsive properties and specific surface area. Their photocatalytic activities were evaluated by degradation of 4-chlorophenol (4-CP) under visible light. The results showed that ZnSn-LDHs with skeleton structure containing Sn displayed the best decomposition efficiency of 4-CP (about 92.4% removal efficiency, 34.6 mg/g removal amount) under visible light irradiation. In addition, based on the results from gas chromatography (GC) and periodic density functional theory (DFT) analysis, the photocatalytic degradation mechanism and reaction pathway of 4-CP were investigated in detail. The data presented in this study implied that the main decomposition intermediates of 4-CP were hydrochinone and 4-chloropyrocatechol.

Key words: Sn-contained layered double hydroxides, photocatalysis, 4-chlorophenol, degradation

CLC Number:

O614

SHAO Meng-Meng, JIANG Jun-Hui, XIA Sheng-Jie, NI Zhe-Ming, LIU Feng-Xian. Visible-light Photocatalytic Degradation Effect of Sn-Contained Layered Double Hydroxides on 4-Chlorophenol[J]. Journal of Inorganic Materials, 2016, 31(1): 7-7.

Figures/Tables 10

Fig. 1 XRD patterns of samples (a) ZnAl-LDHs; (b) SnO2/ZnAl-LDHs; (c) ZnSn-LDHs

Fig. 2 FTIR spectra of samples (a) ZnAl-LDHs; (b) SnO2/ZnAl-LDHs; (c) ZnSn-LDHs

Fig. 3 UV-Vis diffuse reflectance spectra of samples (a) ZnAl-LDHs; (b) SnO2/ZnAl-LDHs; (c) ZnSn-LDHs Inset: plots of (ahv)2 vs hv

Fig. 4 N2 adsorption isotherms of samples a-ZnAl-LDHs; b-SnO2/ZnAl-LDHs; c-ZnSn-LDHs

Fig. 5 Photocatalytic degradation of 4-CP over different samples

Fig. 6 Absorption changes of 4-CP during the photodegradation process on ZnSn-LDHs

Fig. 7 Degradation effect of ZnSn-LDHs for reusing 4 times

Fig. 8 GC curves for degradation process of 4-CP after 5 h reaction

Table 1 Frontier electron densities on atoms of 4-CP calculated by DFT analysis

Fig. 9 Possible pathways for photocatalytic degradation of 4-CP over ZnSn-LDHs

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