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Electromagnetic Properties and Humidity-Sensing Studies of Magnetically Recoverable LaMg x Fe1−x O 3−δ Perovskites Nano-photocatalysts by Sol-Gel Route

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Abstract

Nanostructured perovskite mixed metal oxides, LaMg x Fe1−x O 3−δ (x= 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0), were synthesized successfully by a simple sol-gel route. The formation of single-phase perovskite oxides structure was confirmed by powder X-ray diffraction (XRD) analysis. The average crystallite size of the samples was evaluated using Sherrer’s formula. The presence of functional groups and metal oxide bonds was confirmed by Fourier transform infrared (FT-IR) analysis. Brunauer-Emmett-Teller (BET) surface adsorption studies showed better surface area of the compositions, which was further, evidenced by scanning electron microscopy (SEM) analysis. Room temperature vibrating sample magnetometer (VSM) analysis was confirmed that the superparamagnetic nature and the magnetization values decreased with increase in Mg-dopant. The samples were subjected to dc electrical conductivity studies at room temperature. The dc resistance measurements as a function of relative humidity (RH) at 5, 31, 51, 79, and 98 % were carried out on sintered discs at 25 ∘C under static conditions, which sensitivity factor S f (R 5% / R 95%) were calculated for LaMg x Fe1−x O 3−δ . The temperature-dependent conductance was also carried out in the range of 100–300 ∘C as suggested, and the activation energy was determined. Sample LaMgFe-4 (x= 0.6) possessed the highest humidity-sensing factor (12,926.03 ± 387), while LaFeO3 (x= 0) possessed the lowest sensitivity factor (41.66 ± 3). The response and recovery characteristics were studied for LaMgFe-4, which exhibited a very good narrow hysteresis loop. The photocatalytic degradation (PCD) of methylene blue (MB) dye was investigated under UV-visible light and the sample LaMgFe-4 showed better PCD efficiency than other samples, due to the smaller particle size and higher surface area.

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Acknowledgments

The authors would like to thank Dr. Fr. Jeyaraj S.J., former principal of Loyola College, Dr. Selvanayagam former Director of Loyola Institute of Frontier Energy (LIFE), and Dr. Sr. Jasintha Quadras f.m.m, Principal of Stella Maris College, for giving permission to use the instruments and other facilities.

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Authors and Affiliations

  1. Department of Chemistry, Stella Maris College, Chennai, 600 086, Tamil Nadu, India

    V. Mary Teresita & B. Avila Josephine

  2. Department of Chemistry, Bharath Institute of Higher Education and Research, Bharath University, Chennai, 600 073, Tamil Nadu, India

    A. Manikandan

  3. PG and Research Department of Chemistry, Presidency College (Autonomous), Chennai, 600 005, Tamil Nadu, India

    S. Sujatha & S. Arul Antony

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  1. V. Mary Teresita
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Correspondence to A. Manikandan or S. Arul Antony.

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Teresita, V.M., Manikandan, A., Josephine, B.A. et al. Electromagnetic Properties and Humidity-Sensing Studies of Magnetically Recoverable LaMg x Fe1−x O 3−δ Perovskites Nano-photocatalysts by Sol-Gel Route. J Supercond Nov Magn 29, 1691–1701 (2016). https://doi.org/10.1007/s10948-016-3465-7

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