Cobalt Substitutions in Lanthanum Manganate Photocatalyst： First-principles and Visible-light Photocatalytic Ability Investigation

doi:10.7503/cjcu20200831

Abstract

Abstract:

Perovskite photocatalyst has attracted many attention due to its good stability and perfect catalytic decontamination ability. Sol-gel method can effectively and stably synthetize LaMnO₃. Perovskite can effectively adjust the bandgap with substitute B site of metal and improve its catalytic performance. In this paper， The electronic and optical properties of LaMnO₃ and the combination of LaMn_1-_xCo_xO₃ were simulated by the first principle method. The results showed that Co substitutions can improve the absorption ability to visible light of LaMnO₃. LaMnO₃ was synthetized by sol-gel method， and the stability of the structure under different pH environment was explored. The results showed that LaMnO₃ was more stable under neutral or alkaline environment. The effect of LaMnO₃ in different Co substitution concentration on the photocatalytic activity was studied. Among that， the results of experiment prove that the Co substitutions in LaMnO₃ can improve the photocatalysis ability of LaMnO₃. Compare with other proportion of Co substitutions， LaMn_0.9Co_0.1O₃ powder showed the highest photocatalytic activity， and the degradation rate of methyl orange under visible light was 54%， which is 17% higher than that of LaMnO₃.

Key words: Photocatalysis, Perovskite, First principle, Sol-gel method, Substitution

CLC Number:

O643.3

TrendMD:

LI Yishan, GUO Liang, PENG Sifan, ZHANG Qingmao, ZHANG Yuhao, XU Shiqi. Cobalt Substitutions in Lanthanum Manganate Photocatalyst： First-principles and Visible-light Photocatalytic Ability Investigation[J]. Chem. J. Chinese Universities, 2021, 42(6): 1881.

Figures/Tables 16

Transparent light yellow

Transparent light brown

Transparent dark brown

Phenomenon after standing

White precipitate

Light brown transparent solution

Dark brown transparent solution

Dark brown

transparent solution

Phenomenon after water bath heating

White caking

White

caking

White gel

Light brown gel

Dark brown gel

Co²⁺ doping ratio(%)	$r ˉ B$	t	$r ˉ B / r O$
0	0.0785	0.8932	0.5607
10	0.0779	0.8956	0.5564
20	0.0772	0.8985	0.5514
30	0.0776	0.9010	0.5471
40	0.0759	0.9039	0. 5421

Co²⁺ doping ratio(%)	$r ˉ B$	t	$r ˉ B / r O$
0	0.0785	0.8932	0.5607
10	0.0779	0.8956	0.5564
20	0.0772	0.8985	0.5514
30	0.0776	0.9010	0.5471
40	0.0759	0.9039	0. 5421

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