Molecular Catalysis ( IF 3.9 ) Pub Date : 2020-06-12 , DOI: 10.1016/j.mcat.2020.111050 Arpita Hazra Chowdhury , Ipsita Hazra Chowdhury , Surajit Biswas , Sk. Manirul Islam
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We have designed mesoporous AgNPs decorated COF (Ag/TFPG-DMB COF) nanomaterial which has been formed by an easy ex-situ synthetic method. The synthesized material is characterized by FTIR, PXRD, UV–vis, N2 adsorption–desorption studies, TEM, FESEM and XPS. The material showed the generation of identical mesopore at 3.9 nm. It is observed that the material can perform as both thermally and photochemically active catalyst for carbamate synthesis and one-pot reduction and N-formylation of nitroarenes respectively. The catalytic activity of the Ag/ TFPG-DMB COF nanomaterial is checked for green synthesis of carbamates from different amines and alcohols under 1 atmospheric pressure of CO2 with excellent yield (upto 95 %) as well as with high TOF value (182 h−1) and high selectivity. Additionally, the Ag/ TFPG-DMB COF nanomaterial is also applied as a potentially active photocatalyst for one-pot nitroarene reduction along with N-formylation reaction under sunlight irradiation in green reaction conditions with exceptionally high yield of formylated products upto 99 % as well as with high TOF value (762 h −1). The catalyst efficiently reduced and formylated para-nitrophenol, a potential water pollutant, which elaborates its scope as an efficient catalyst for water purification also. The catalyst recyclability is also checked for five reaction cycles for both the reactions and the Ag/TFPG-DMB COF material showed outstanding recycling ability without any noticeable leaching of active metal or catalyst degradation.
中文翻译:
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Ag / TFPG-DMB COF在阳光下通过CO 2固定反应和硝基芳烃一锅还原N-甲酰化在氨基甲酸酯合成中的应用
我们设计了介孔AgNPs修饰的COF(Ag / TFPG-DMB COF)纳米材料,该材料是通过易位合成方法形成的。合成材料的特征在于FTIR,PXRD,UV-vis,N 2吸附-解吸研究,TEM,FESEM和XPS。该材料在3.9 nm处显示出相同的中孔的产生。观察到该材料既可以作为热活性催化剂也可以作为光化学活性催化剂,分别用于氨基甲酸酯的合成以及硝基芳烃的一锅还原和N-甲酰化。对于Ag / TFPG-DMB COF纳米材料的催化活性下1个大气压的CO压力检查从不同的胺和醇的氨基甲酸酯的绿色合成2具有优异的产率(高达95%),以及与高TOF值(182ħ - 1个)和高选择性。另外,Ag / TFPG-DMB COF纳米材料还可用作潜在的活性光催化剂,用于在绿色反应条件下在阳光照射下一锅还原硝基芳烃以及进行N-甲酰化反应,甲酰化产物的收率极高,高达99%,并且TOF值高(762 h -1)。该催化剂有效地还原和甲酰化了对硝基苯酚(一种潜在的水污染物),从而进一步阐明了其作为水净化有效催化剂的范围。对于两个反应,还检查了五个反应循环的催化剂再循环能力,并且Ag / TFPG-DMB COF材料显示出优异的再循环能力,而没有任何明显的活性金属浸出或催化剂降解。