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材料研究学报  2012, Vol. 26 Issue (5): 476-482    
  研究论文 本期目录 | 过刊浏览 |
La0.7Sr0.3MnO3纳米颗粒的制备和光催化性能
王宇峰2, 杨华1,2, 县 涛1,2, 张海民2, 苏俊燕2
1.兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室  兰州 730050
2.兰州理工大学理学院  兰州 730050
Preparation and Photocatalytic Properties of La0.7Sr0.3MnO3 Nanoparticles
WANG Yufeng2, YANG Hua1,2,  XIAN Tao1,2,  ZHANG Haimin2,  SU Junyan2
1.State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology, Lanzhou 730050
2.School of Science, Lanzhou University of Technology, Lanzhou 730050
引用本文:

王宇峰 杨华 县 涛 张海民 苏俊燕. La0.7Sr0.3MnO3纳米颗粒的制备和光催化性能[J]. 材料研究学报, 2012, 26(5): 476-482.
WANG Yufeng YANG Hua XIAN Tao ZHANG Haimin SU Junyan. Preparation and Photocatalytic Properties of La0.7Sr0.3MnO3 Nanoparticles[J]. Chinese Journal of Materials Research, 2012, 26(5): 476-482.

全文: PDF(1027 KB)  
摘要: 

采用聚丙烯酰胺凝胶法制备La0.7Sr0.3MnO3(LSMO)纳米颗粒, 用X射线衍射、扫描电镜对样品进行了表征。结果表明, 分别以柠檬酸、酒石酸、醋酸、草酸、EDTA为络合剂, 在600℃烧结均可制备出单相LSMO纳米颗粒;样品颗粒主要呈类球型, 其中以柠檬酸为络合剂制得的颗粒形貌最佳;这些样品的平均颗粒尺寸分别为24 nm(柠檬酸)、28 nm(酒石酸)、36 nm(醋酸)、38 nm(草酸)、50 nm(EDTA)。以甲基红乙醇溶液为目标降解物, 采用可见光源钨灯为辐照光源, 研究了LSMO纳米颗粒的光催化性能。结果表明, 甲基红的吸附及光催化降解率与反应液中H2O含量紧密相关, 以柠檬酸为络合剂制得的颗粒光催化活性相对较高。LSMO的光催化机理, 主要为光生空穴的直接氧化。

关键词 无机非金属材料La0.7Sr0.3MnO3聚丙烯酰胺凝胶法络合剂光催化    
Abstract

La0.7Sr0.3MnO (LSMO) nanoparticles were synthesized by a polyacrylamide gel technique. X-ray diffraction and scanning electron microscope were adopted to characterize the as-prepared samples. The results show that single-phase LSMO nanoparticles can be prepared by calcination at 600℃ using citric acid, tartaric acid, acetic acid, oxalic acid and ethylenediamine-tetraacetic acid (EDTA) as the chelating agent, respectively. The particles prepared using the five chelating agents are like spheres, and
the citric acid-derived particles exhibit the best particle shape. The average particle size of five samples is 24, 28, 36, 38, and 50 nm, respectively. The photocatalytic properties of LSMO particles were evaluated by degradation of methyl red (MR) in ethanol/water solution under irradiation of visible-light tungsten lamp. The results show that the adsorption and photocatalytic degradation of MR are highly dependent on the H2O content in the reactive mixture. Among the samples, the citric acid-derived particles exhibit the highest photocatalytic activity. The direct hole oxidation is suggested to be the main mechanism toward the MR degradation.

Key wordsinorganic non-metallic materials    La0.7Sr0.3MnO3    polyacrylamide gel method    chelating agents    photocatalysis
收稿日期: 2012-06-27     
ZTFLH:  TB321  
基金资助:

国家自然科学基金(50962009), 甘肃省自然科学基金(1010RJZA041)及兰州理工大学优秀青年资助计划(Q200902)资助项目。

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