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人工晶体学报 ›› 2017, Vol. 46 ›› Issue (10): 2037-2044.

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NiFe2O4/g-C3N4的制备及可见光催化降解甲基橙

刘勇;宋玉春;黄敏;黄明;付孝锦;郑小刚   

  1. 内江师范学院化学化工学院,内江,641100
  • 发布日期:2021-01-20
  • 基金资助:
    四川省教育厅重点项目(17ZA0218)

Synthesis of NiFe2O4/g-C3N4 for the Photocatalytic Degradation of Methyl Orange under Visible-light Irradiation

LIU Yong;SONG Yu-chun;HUANG Min;HUANG Ming;FU Xiao-jin;ZHENG Xiao-gang   

  • Published:2021-01-20

摘要: 采用浸渍法制备不同负载量NiFe2 O4的负载型光催化剂NiFe2 O4/g-C3 N4,利用XRD、FT-IR、N2-adsorption、ICP-OES、TEM及XPS等手段表征NiFe2 O4/g-C3 N4样品,并考察其对甲基橙的可见光催化降解性能.结果表明,与NiFe2 O4和g-C3 N4样品相比,负载型NiFe2 O4/g-C3 N4样品对甲基橙具有更好的光催化降解活性,且催化活性随着NiFe2 O4负载量增大(0.5~5.0wt;)而呈现先增大再减小的趋势.NiFe2 O4负载量2.0wt;的样品2-NiFe/CN在可见光照射下对浓度5 mg·L-1的甲基橙表现出最好的降解活性和稳定性.这是因为能带宽度小(1.5 eV)的NiFe2 O4与能带宽度大(2.7 eV)的g-C3 N4形成的异质结催化剂NiFe2 O4/g-C3 N4,有效地促进光生载流子在二者界面快速传递和光生电子-空穴对的有效分离.

关键词: NiFe2O4/g-C3N4;掺杂效应;甲基橙;光催化降解

Abstract: The supported photocatalysts NiFe 2 O4/g-C3 N4 with different NiFe2 O4 content were synthesized by impregnation method and performed on the photocatalytic degradation of methylene orange ( MO ) under visible-light region.Several techniques, including XRD, FT-IR, N2-adsorption, ICP-IOS SEM, TEM and XPS, were employed to obtain the physical and chemical properties of NiFe 2 O4/g-C3 N4 samples.The results indicate that the supported catalyst NiFe 2 O4/g-C3 N4 exhibited higher photocatalytic activity of MO compared to NiFe 2 O4 and g-C3 N4 .The catalytic activity of NiFe 2 O4/g-C3 N4 sample increased and then decreased with the increasing NiFe 2 O4 doping amount ranged from 0.5wt; to 5. 0wt;, of which the 2-NiFe/CN sample with 2.0wt; NiFe2 O4 loading exhibited the best degradation activity and stability for the photocatalytic degradation of methyl orange (5 mg· L-1 ) under visible light irradiation.It's ascribed to the heterojunction structure of NiFe 2 O4/g-C3 N4 sample formed between narrow energy band (1.5 eV) of NiFe2 O4 and wide energy band (2.7 eV) of g-C3 N4 , which facilities the speed transmission of photoexcited carriers at the interface of NiFe 2 O4 and g-C3 N4 , and enhances the effective separation of electron-hole pairs.

Key words: The supported photocatalysts NiFe 2 O4/g-C3 N4 with different NiFe2 O4 content were synthesized by impregnation method and performed on the photocatalytic degradation of methylene orange ( MO ) under visible-light region.Several techniques, including XRD, FT-IR, N2-adsorption, ICP-IOS SEM, TEM and XPS, were employed to obtain the physical and chemical properties of NiFe 2 O4/g-C3 N4 samples.The results indicate that the supported catalyst NiFe 2 O4/g-C3 N4 exhibited higher photocatalytic activity of MO compared to NiFe 2 O4 and g-C3 N4 .The catalytic activity of NiFe 2 O4/g-C3 N4 sample increased and then decreased with the increasing NiFe 2 O4 doping amount ranged from 0.5wt; to 5. 0wt;, of which the 2-NiFe/CN sample with 2.0wt; NiFe2 O4 loading exhibited the best degradation activity and stability for the photocatalytic degradation of methyl orange (5 mg· L-1 ) under visible light irradiation.It's ascribed to the heterojunction structure of NiFe 2 O4/g-C3 N4 sample formed between narrow energy band (1.5 eV) of NiFe2 O4 and wide energy band (2.7 eV) of g-C3 N4 , which facilities the speed transmission of photoexcited carriers at the interface of NiFe 2 O4 and g-C3 N4 , and enhances the effective separation of electron-hole pairs.

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