Photocatalytic Degradation of Methylene Blue by Schiff-base Cobalt Modified CoCr Layered Double Hydroxides

doi:10.15541/jim20180558

Abstract

Abstract:

A series new material of cobalt (Ⅱ) with Schiff-base intercalated cobalt-chromium layered double hydroxides (CoCr/SBCo-LDHs) were successfully prepared via coprecipitation. Their structure and property of the CoCr-LDHs and CoCr/SBCo-LDHs materials were thoroughly characterized by X-ray powder diffraction (XRD), UV-Vis DRS, scanning electron microscope (SEM), transmission electrons microscope (TEM) and energy dispersive X-ray spectroscope (EDX), X-ray photoelectron spectroscope, and specific surface area analyzer. Using H₂O₂ as photocatalytic additive, the effects of different intercalation amount, catalyst dosage and initial concentration of methylene blue (MB) solution on photocatalytic activity were investigated, and the kinetics and main active groups of photocatalytic degradation process were explored. Experimental results show that H₂O₂ can improve the photocatalytic performance of hydrotalcite materials. Under the condition of the Xenon lamp simulated sunlight and MB initial concentration of 25 mg/L, the photocatalytic degradation rate of MB by 20 mg CoCr/SBCo_0.5-LDHs and H₂O₂ was 99%. The photodegradation process of MB conforms to the quasi-first-order kinetic model, and the active groups playing major role are h ⁺ and ·OH.

Key words: Schiff base cobalt, CoCr-LDHs, photocatalysis, hydrogen peroxide additive, methylene blue, dynamics

CLC Number:

0643

ZHANG Xiao-Feng,ZHANG Guan-Hua,MENG Yue,XUE Ji-Long,XIA Sheng-Jie,NI Zhe-Ming. Photocatalytic Degradation of Methylene Blue by Schiff-base Cobalt Modified CoCr Layered Double Hydroxides[J]. Journal of Inorganic Materials, 2019, 34(9): 974-982.

Figures/Tables 14

Fig. 1 Diagram of preparative route of SBCo

Fig. 2 XRD patterns (A) and UV-Vis diffuse reflectance spectra (B) and plots of (ahv)2 vs hv (C) for the samples

Fig. 3 Molecular structure of Salen-Co(II) (a) and CoCr/SBCo-LDHs (b)

Fig. 4 SEM and TEM images of CoCr-LDHs and CoCr/ SBCo0.5-LDHs, and EDX analysis of CoCr/SBCo0.5-LDHs SEM images of CoCr-LDHs(A) and CoCr/SBCo0.5-LDHs (B); TEM images of CoCr/SBCo0.5-LDHs (C) and EDX analysis of designated area (D)

Fig. 5 XPS analysis for CoCr-LDHs (A, B) and CoCr/SBCo0.5-LDHs (C-E)

Fig. 6 N2 adsorption-desorption isotherms and pore size distribution curves (insets) for CoCr-LDHs (A) and CoCr/SBCo-LDHs (B)

Table 1 Textural properties for CoCr-LDHs and CoCr/SBCo0.5-LDHs

Sample	Surface area/(m²?g^-1)	Pore volume/(cm³?g^-1)	Average pore size/nm	Peak of pore size distribution/nm
CoCr-LDHs	96.4	0.537	22.5	20, 65
CoCr/SBCo_0.5-LDHs	107.8	0.526	19.2	18, 30, 60

Table 2 Degradation rate of methylene blue by catalyst and H2O2

Catalyst	CoCr-LDHs	CoCr/SBCo_0.25-LDHs	CoCr/SBCo_0.5-LDHs	CoCr/SBCo_0.75-LDHs	H₂O₂
Degradation/%	7	9	10	10	13

Fig. 7 Influence of intercalated schiff-base cobalt dosage intercalation on photocatalytic MB a: No catalyst and H2O2; b: CoCr-LDHs; c: CoCr/SBCo0.25-LDHs; d: CoCr/SBCo0.5-LDHs; e: CoCr/SBCo0.75-LDHs

Fig. 8 Influence of catalyst amounts on photocatalytic MB

Fig. 9 Effect of MB concentration on photocatalytic performance

Fig. 10 Pseudo-first-order kinetics of photodegradation of MB by different materials

Table 3 Pseudo-first-order kinetic parameters for MB photodegradation by different materials

LDHs	K/h^-1	R²	t_1/2/h
CoCr-LDHs	0.0095	0.9536	72.9628
CoCr/SBCo_0.25-LDHs	0.0564	0.9689	12.2898
CoCr/SBCo_0.5-LDHs	0.8869	0.9984	0.7815
CoCr/SBCo_0.75-LDHs	0.1241	0.9961	5.5854

Fig. 11 Quenching experimental of reactive group

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