溶液燃烧合成LaFe1-xMgxO3超细粉体及其光催化性能

doi:10.15541/jim20150251

摘要/Abstract

摘要：

采用溶液燃烧合成Mg²⁺掺杂LaFeO₃超细粉体, 并利用XRD、SEM、BET和UV-VIS分析Mg²⁺掺杂量对合成粉体的物相组成、微观形貌和光催化性能的影响。结果表明: Mg²⁺取代Fe³⁺形成LaFe_1-_xMg_xO₃(0≤x≤0.2)有限型固溶体。当掺杂量为0.1时(x=0.1), 合成粉体具有最大的比表面积(43.46 m²/g)和较小粒径(径向和长度方向分别为100 nm和150 nm), 因此具有最佳的光催化性能, 在高压汞灯180 min照射下, 对甲基橙溶液(10 mg/L)的降解率达75.2%, 与纯LaFeO₃的相比, 光降解率增加26.5%, 且光催化反应符合一级动力学方程。

关键词: LaFeO3, Mg2+掺杂, 溶液燃烧法, 光催化性能

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

中图分类号:

O614

李家科, 刘欣, 黄丽群, 王艳香. 溶液燃烧合成LaFe_1-_xMg_xO₃超细粉体及其光催化性能[J]. 无机材料学报, 2015, 30(11): 1223-1227.

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.

图/表 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

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溶液燃烧合成LaFe_1-_xMg_xO₃超细粉体及其光催化性能

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

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