A two-dimensional Cu(II) metal-organic framework and its g-C3N4 heterojunction composite for high efficient photodegradation of organic dyes

• Published in: Journal of solid state chemistry Vol. 326; p. 124173
• Main Authors: Li, Le-Yan, Wang, Xing, Ma, Li-Xiao, Zhou, Wen-Jing, Li, Bao-Long, Li, Hai-Yan, Hu, Chuan-Jiang
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.10.2023
• Subjects: MOF; MOF composite; Photocatalytic mechanism; Structure; MOF composite; Photocatalytic mechanism; Structure; MOF
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2023.124173

A two-dimensional Cu(II) MOF {[Cu2(OH)(mtrb)(suc)1.5(H2O)2]·H2O·0.5DMA}n (Cu(mtrb)) (mtrb = 1,3-bis((1,2,4-triazol-4-ylmethyl)benzene, H2suc = succinic acid, DMA = N, N-dimethylacetamide) was obtained using solvothermal synthesis. Cu(mtrb) has a two-dimensional (6,3) network with the point symbol of 63. A series of Cu(mtrb)/wt%g-C3N4 composites were obtained by coupling Cu(mtrb) and semiconductor g-C3N4 to give heterojunctions by the grinding method. The composite samples were investigated with XRD, FT-IR, SEM, EDS, XPS, TGA, UV–Vis, PL and EIS to analyze the purity, functional groups, surface morphology, elemental distribution, valence electron, thermal stability, visible-light absorption and electron-hole pair separation status. Photocatalytic degrade methylene blue (MB), methyl orange (MO) and rhodamine B (RhB) were investigated. Cu(mtrb) can degrade 93.6% MB in 30 min, 87.0% MO in 135 min and 92.0% RhB in 90 min. Cu(mtrb)/10%g-C3N4 could degrade 96.2% MB in 15 min, 87.0% MO in 45 min and 92.3% RhB in 60 min, respectively. The coupling of Cu(mtrb) with g-C3N4 resulted in the formation of heterojunctions in Cu(mtrb)/wt%g-C3N4 composites and inhibited the rapid recombination of electron-hole pairs. The main reactive species for MB degradation were •OH and h+. Cu(mtrb) and Cu(mtrb)/10%g-C3N4 composites are the good photocatalysts. A 2D Cu-MOF Cu(mtrb) and a series of Cu(mtrb)/wt%g-C3N4 composites were synthesized and characterized. Cu(mtrb) can degrade 93.6% MB in 30 min, 87.0% MO in 135 min and 92.0% RhB in 90 min. Cu(mtrb)/10%g-C3N4 could degrade 96.2% MB in 15 min, 87.0% MO in 45 min and 92.3% RhB in 60 min, respectively. The main reactive species for MB degradation were •OH and h+. Cu(mtrb) and Cu(mtrb)/10%g-C3N4 are the good photocatalysts. [Display omitted] •A Cu-MOF Cu(mtrb) and its g-C3N4 composite were synthesized and characterized.•Cu(mtrb) can degrade 93.6% MB in 30 min, and Cu(mtrb)/10%g-C3N4 could degrade 96.2% MB in 15 min.•Cu(mtrb)/10%g-C3N4 could degrade 87.0% MO in 45 min and 92.3% RhB in 60 min.•The main reactive species for MB degradation were .•OH and h+.•A Cu-MOF Cu(mtrb) and Cu(mtrb)/10%g-C3N4 composite are the good photocatalysts.