Exploration of double Z-type ternary composite long-afterglow/graphitic carbon nitride@metal-organic framework for photocatalytic degradation of methylene blue

被引:39
作者
Chen, Mao -Long [1 ]
Li, Shan -Shan [1 ]
Wen, Li [1 ]
Xu, Zhou [1 ]
Li, Hong -Hui [1 ]
Ding, Li [1 ]
Cheng, Yun-Hui [1 ,2 ]
机构
[1] Changsha Univ Sci & Technol, Sch Food Sci & Bioengn, Changsha, Hunan, Peoples R China
[2] Qilu Univ Technol, Sch Food Sci & Engn, Jinan, Shandong, Peoples R China
关键词
Novel double Z-type ternary composite; Degradation methylene blue; Long-afterglow; Graphitized carbon nitride; Metal-organic framework; Photocatalysis; HETEROJUNCTION; G-C3N4; CONSTRUCTION; NANOPARTICLES; PERFORMANCE; REMOVAL; IONS; DYES;
D O I
10.1016/j.jcis.2022.08.189
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Methylene blue (MB) is a very widely used cationic dye for color cotton and silk products. The harmful MB has a complex aromatic structure that is difficult to be degraded in natural aqueous. In this study for the first time, a novel double Z-type ternary composite long-afterglow/graphitic carbon nitride@metal-organic framework (SrAl2O4:Eu2+,Dy3+/g-C3N4@NH2-UiO-66, SGN) has been synthesized by solvothermal method, and was used as a new photocatalyst for removal of MB. The photocatalytic performance of the composited photocatalyst SGN was largely improved compared to that of the non-composite. After 30 min of photocatalysis, the degradation ratio of SGN was 5.86, 4.04 and 10 times more efficient than that of long-afterglow (SAO), g-C3N4 and NH2-UiO-66, respectively. The high photocatalytic activity of the SGN could be ascribed to the double Z-type electron transfer mechanism. More importantly, due to the luminescence of SAO, the degradation ratio of ternary SGN can reach about 50 % after 5 h in the dark. Superoxide anion (.O-2(-)) was verified to be the main active substance in the photocatalytic process by quenching experiments and electron spin resonance (ESR) spectra analysis. The total organic matter contents (TOC) and partial degradation products were measured, which confirmed that some MB was mineralized into H2O and CO2, and some was degraded into smaller molecules. Moreover, the excellent stability and recyclability of this catalyst were also investigated. Here, a new promising material with high degradation performance for water pollution treatment is presented. (c) 2022 Elsevier Inc. All rights reserved.
引用
收藏
页码:409 / 421
页数:13
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