Cu2O/MnCo2O4异质结纳米光催化剂还原CO2的研究

摘要/Abstract

摘要： Z型异质结光催化剂具有导带和价带电荷分离能力强、氧化还原能力强等优点，被光催化研究者所青睐。采用水热法制备了Z型Cu₂O/MnCo₂O₄异质结纳米光催化剂，并对其物理化学性质进行了详细表征，评价了其光催化CO₂还原性能。结果表明：Cu₂O/MnCo₂O₄异质结纳米光催化剂相比MnCo₂O₄纳米颗粒，改善了可见光吸收性能，降低了带隙，有效延缓了电子-空穴对的复合，降低了电子-空穴对转移运动电阻，从而提高了催化剂的光催化活性；15%（w）Cu₂O含量的异质结纳米光催化剂具有最优的光催化CO₂还原性能，CO产率为98.6 μmol/g，CH₄产率为68.4 μmol/g，重复使用6次后其催化活性基本无变化。

关键词: 光催化, 二氧化碳还原, Cu₂O, MnCo₂O₄, Z型异质结, 一氧化碳, 甲烷

Abstract: Z-type heterojunction photocatalyst is favored by researchers because of strong charge separation ability of conduction band and valence band, and strong oxidation- reduction ability. Z-type Cu₂O/MnCo₂O₄ heterojunction nano-photocatalysts were prepared by hydrothermal method, their physical and chemical properties were characterized in detail, and their photocatalytic CO₂ reduction performance was evaluated. The characteristic results of XRD, HRTEM, UV vis, PL and EIS showed that compared with MnCo₂O₄ nano-particles,Cu₂O/MnCo₂O₄eterojunction nano-photocatalyst could improve the visible light absorption performance, reduce the band gap, delay the recombination of electron-hole pairs effectively, and reduce the transfer resistance of electron-hole pairs, which confirmed that heterojunction nano-structures could effectively improve the photocatalytic activity for CO₂. The evaluation results of photocatalytic reduction of CO₂ showed that heterojunction nano-photocatalyst with 15%（w) Cu₂O content had the best photocatalytic activity for CO₂ reduction, and the CO yield was 98.6 μmol/g, the yield of CH₄ was 68.4 μmol/g, and its catalytic activity remained unchanged after 6 times of recycling uses.

Key words: hotocatalytic, CO₂ reduction, Cu₂O, MnCo₂O₄, Z-type heterojunction, CO, CH₄

郭振莲李新王文静王小燕董松祥王兴之牟庆平. Cu₂O/MnCo₂O₄异质结纳米光催化剂还原CO₂的研究[J]. 石油炼制与化工, 2023, 54(10): 85-91.

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Cu₂O/MnCo₂O₄异质结纳米光催化剂还原CO₂的研究

REDUCTION OF CO₂ BY Cu₂O/MnCo₂O₄ HETEROJUNCTION NANO-PHOTOCATALYST

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