Impact of the annealing temperature on perovskite strontium doped neodymium manganites nanocompos-ites and their photocatalytic performances

被引：28

作者：

Abdel-Latif, I. A. ^{[1
,3
,4
]}

Ismail, Adel A. ^{[2
]}

Faisal, M. ^{[3
]}

Ali, Atif M. ^{[5
,6
]}

Al-Salmi, A. E. ^{[5
]}

Al-Hajry, A. ^{[1
,3
]}

机构：

[1] Najran Univ, Coll Sci, Phys Dept, POB 1988, Najran 11001, Saudi Arabia

[2] Cent Met Res & Dev Inst, Nanostruct Mat & Nanotechnol Div, POB 87 Helwan, Cairo 11421, Egypt

[3] Najran Univ, Adv Mat & Nanores Ctr, POB 1988, Najran 11001, Saudi Arabia

[4] Atom Energy Author, NRC, Reactor Phys Dept, Abou Zabaal POB 13759, Cairo, Egypt

[5] King Khalid Univ, Res Ctr Adv Mat Sci, POB 9004, Abha 61413, Saudi Arabia

[6] Assiut Univ, Fac Sci, Dept Phys, Assiut 71516, Egypt

来源：

JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS | 2017年 / 75卷

关键词：

Perovskite; Nd0.6sr0.4mno3; Nanocomposites; Photocatalysts; Visible light; HYDROGEN-PRODUCTION; ELECTRONIC-STRUCTURES; THIN-FILMS; RAMAN; OXIDES; NATAO3; SIZE; LA; MAGNETORESISTANCE; SPECTROSCOPY;

D O I：

10.1016/j.jtice.2017.03.030

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In the present work, Nd0.6Sr0.4MnO3 nanocomposite perovskite has been synthesized using sol-gel method in the presence of polyethylene glycol and citric acid. As-synthesized Nd0.6Sr0.4MnO3 perovskite was annealed at different temperatures (500-1150 degrees C). The obtained perovskite Nd0.6Sr0.4MnO3 nanocomposites exhibit wide optical absorption in the UV-visible range with low bandgap values similar to 2-2.98 eV relied on annealing temperatures. The crystalline size of the annealed sample at 500 degrees C was 55 nm increased with boosting temperature to 168 nm at 1150 degrees C. The newly prepared perovskite has been assessed by MB photodegradation under visible light. Our findings reveal that, Nd0.6Sr0.4MnO3 perovskite with 26.18% orthorhombic and 73.82% monoclinic phases annealed at 500 degrees C is a superior photocatalyst than that of Nd0.6Sr0.4MnO3 perovskite containing 82.22% cubic and 17.78% orthorhombic phases annealed at 1150 degrees C. 100% of MB could be photodegraded by the Nd0.6Sr0.4MnO3 perovskite annealed at 500 degrees C. However, with the increase annealing temperature to 1150 degrees C, the photocatalytic efficiency was reduced to 60%. The overall photodegradation rate of Nd0.6Sr0.4MnO3 perovskite annealed at 500 degrees C is significantly 3-times higher than that of Nd0.6Sr0.4MnO3 perovskite annealed at 1150 degrees C. The superiority of the perovskite Nd0.6Sr0.4MnO3 annealed at 500 degrees C is attributed to the double phases formed (monoclinic/orthorhombic) framework, high crystallinity, and the high distortion of the Mn-O polyhedron. It is believed that the high visible-light absorption, lattice distortion and narrow band gap are considered to be the key factors for the high photocatalytic activity of the obtained Nd0.6Sr0.4MnO3 perovskite annealed at 500 degrees C. (C) 2017 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

引用

页码：174 / 182

页数：9

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