LaFe1-xMgxO3 Ultrafine Powders Synthesized by Solution Combustion and Its Photocatalytic Performances

doi:10.15541/jim20150251

Abstract

Abstract:

Mg²⁺ doped LaFeO₃ ultrafine powders were synthesized by solution combustion method. Effects of Mg²⁺ doping content on phase composition, microstructure and photocatalytic performances of the synthesized powders were investigated by XRD, SEM, BET, and UV-Vis. The results show that Mg²⁺ substitutes for Fe³⁺ to form LaFe_1-_xMg_xO₃(0≤x≤0.2) limited solid solution. When Mg²⁺ doping content is 0.1, LaFe_0.9Mg_0.1O₃ powder has a maximum specific surface area (43.46 m²/g) and smaller particle size (100 nm and 150 nm in diameter and length direction, respectively). It has the best photocatalytic ability with photodegradation efficiency of 75.2% to methyl orange (10 mg/L) under high-pressure mercury lamp irradiation for 180 min. It increases 26.5% than that of the pure LaFeO₃ under the same experimental conditions, and the reaction may be described as the pseudo first order kinetics equation.

Key words: LaFeO3, Mg2+ doping, solution combustion, photocatalytic performances

CLC Number:

O614

LI Jia-Ke, LIU Xin, HUANG LI-Qun, WANG Yan-Xiang. LaFe_1-_xMg_xO₃ Ultrafine Powders Synthesized by Solution Combustion and Its Photocatalytic Performances[J]. Journal of Inorganic Materials, 2015, 30(11): 1223-1227.

Figures/Tables 6

Fig. 1 XRD patterns of the synthesized powders with different Mg2+ doping contents

Fig. 2 SEM images of LaFe1-xMgxO3 powders (a) x=0; (b) x=0.05; (c) x=0.1; (d) x=0.2

Table 1 Specific surface area of the synthesized powders with Mg2+ different doping content

Mg²⁺ doping content, x	Specific surface area/(m²·g^-1)
x=0	20.63
x=0.05	24.52
x=0.1	43.46
x=0.15	33.57
x=0.2	28.82

Fig. 3 Photocatalytic performance of the synthesized powders with different Mg2+ doping contents

Fig. 4 Relationship between ln(C0/Ct ) and degradation time (t) of methyl orange with the synthesized LaFe1-xMgxO3 at different amount of Mg2+ doping

Table 2 Reaction equations and rate constant values for the degradation of methyl orange with the synthesized LaFe1-xMgxO3 at different Mg2+ doping contents

Doping content, x	Kinetic equation	Rate constant, k/min^-1	Correlation coefficient, R²
0	ln(C₀/C_t)=0.00587t+0.914	0.00587	0.9956
0.05	ln(C₀/C_t)=0.00877t+0.83733	0.00877	0.9921
0.1	ln(C₀/C_t)=0.0186t+0.78533	0.01860	0.9864
0.15	ln(C₀/C_t)=0.01449t+0.87067	0.01449	0.9935
0.2	ln(C₀/C_t)=0.01084t+0.97533	0.01084	0.9947

References 20

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LaFe_1-_xMg_xO₃ Ultrafine Powders Synthesized by Solution Combustion and Its Photocatalytic Performances

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