层状半导体氧化物Li2MnO3制备及光催化降解2，4-DCP研究

doi:10.19964/j.issn.1006-4990.2024-0623

Abstract

Abstract:

In this study，layered Li₂MnO₃ was prepared by solid-phase synthesis and applied to the photocatalytic degradation of 2，4-dichlorophenol（2，4-DCP） in water.The morphology and structure of the photocatalysts were characterized using XRD，TEM and FT-IR，and the optical and electrochemical properties were characterized through UV-Vis DRS and EIS.It was found that the Li₂MnO₃（LMO-900） obtained at a sintering temperature of 900 ℃ exhibited excellent photocatalytic performance，with a degradation efficiency of 2，4-DCP as high as 87% within 30 min.The results of ultraviolet-visible diffuse reflectance spectroscopy（UV-Vis DRS） and Mott-Schottky curves showed that the band gap of Li₂MnO₃ was 2.07 eV，the valence band potential was 1.68 V（vs.NHE） and the conduction band potential was -0.39 V（vs.NHE），indicating that it had good photogenerated electron and hole redox capabilities.Electrochemical impedance spectroscopy tests revealed the effect of sintering temperature on carrier separation efficiency，among which LMO-900 had the highest carrier separation efficiency.Radical trapping experiments showed that holes（h⁺） and superoxide anion radicals（∙O₂^-） were the main active species in the process of Li₂MnO₃ photocatalytic degradation of 2，4-DCP.Electronic structure calculation and analysis showed that the Mn-O bond was the key to the photocatalytic activity centre and played a decisive role in the degradation of 2，4-DCP.

Key words: layered oxides, Li₂MnO₃, Photocatalysis, 2，4-dichlorophenol

CLC Number:

O643.36

ZHOU Ying, LAI Han, DAI Peng, PENG Qinlei, GUO Xichuan, YANG Dingfeng, LI Yuanyuan. Study on preparation of layered semiconductor oxide Li₂MnO₃ and photocatalytic degradation of 2，4-DCP[J]. Inorganic Chemicals Industry, 2025, 57(10): 139-146.

Figures/Tables 12

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References 29

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催化剂	降解率/%	降解时间/min	催化剂用量/mg	污染物质量浓度/（mg·L^-1）	灯源
Li₂MnO₃	87	30	50	15（2，4-DCP）	500 W汞灯
Li₂MnO₃/Co₃O₄^［16］	100	120	200	20（四环素）	300 W氙灯
Li₂MnO₃@ZrO₂^［18］	100	60	100	50（阿特拉津）	300 W氙灯
Li₂SnO₃^［25］	69	12	50	10（2，4-DCP）	500 W汞灯
BiFeO₃^［26］	28	60	100	20（2，4-DCP）	300 W氙灯
CoTiO₃^［27］	46	120	30	10（2，4-DCP）	500 W氙灯
BiOBr^［28］	25	90	200	10（2，4-DCP）	150 W氙灯
In₂O₃^［29］	65	100	25	50（2，4-DCP）	300 W氙灯

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Study on preparation of layered semiconductor oxide Li₂MnO₃ and photocatalytic degradation of 2，4-DCP

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Study on preparation of layered semiconductor oxide Li2MnO3 and photocatalytic degradation of 2，4-DCP