Photocatalytic Chemical CO₂ Fixation by Cu-BDC Nanosheet@Macroporous–Mesoporous-TiO₂ under Mild Conditions

Abstract

Growing greenhouse gas CO2 is driving the research on the chemical fixation of CO2. Here, the organic reaction of CO2 with benzyl halogen for chemical CO2 fixation under ambient conditions with irradiation of ultraviolet light is successfully catalyzed by Cu-BDC nanosheet@macroporous–mesoporous-TiO2 (Cu-BDC@macro–meso-TiO2), which shows high photocatalytic activity for both benzyl chloride and bromide reacting with CO2. Meanwhile, the prepared Cu-BDC@macro–meso-TiO2 possesses a three-scale porous structure, including macropores, mesopores, and micropores. In the uniform hierarchical structure, the microporous Cu-BDC nanosheet is confined in the macropore of macroporous–mesoporous-TiO2, while the ordered mesoporous structure is in the macroporous walls. This multilevel porous distribution can significantly improve the active surface areas and mass transfer efficiency of Cu-BDC@macro–meso-TiO2. Therefore, this finding has opened a field of research on photocatalytic chemical CO2 fixation.

Co‐Doped Mn3O4 Nanocubes via Galvanic Replacement Reactions for Photocatalytic Reduction of CO2 with High Turnover Number

“…Brunauer‐Emmett‐Teller (BET) and CO 2 adsorption isotherm results (Figure S5) reveal that the Co x Mn 3‐ x O 4 nanocubes have a surface area of 69.6 m 2 g −1 with a pore size distribution of 4–50 nm, and a maximum CO 2 uptake of 5.1 cm 3 g −1 (25 °C, 1 atm), which is higher than that of ZnIn 2 S 4 (4 cm 3 g −1 ) and Cu 2 O (2.2 cm 3 g −1 ) [30] . The presence of mesoporous structure can offer large amounts of catalytic active sites and promote the adsorption and local concentration of CO 2 , which accelerates mass/charge transfer and enhances the photocatalytic performance of CO 2 reduction [31] …”

“…[30] The presence of mesoporous structure can offer large amounts of catalytic active sites and promote the adsorption and local concentration of CO 2 , which accelerates mass/charge transfer and enhances the photocatalytic performance of CO 2 reduction. [31] The photocatalytic performances of the Co x Mn 3-x O 4 nanocubes for CO 2 reduction are evaluated by using visible light (λ > 400 nm, 200 mW cm À 2 ) in a CO 2 -saturated H 2 O/acetonitrile mixture under mild reaction conditions (25 °C). [Ru-(bpy) 3 ]Cl 2 • 6H 2 O (bpy = 2, 2'-bipyridine) and triethanolamine (TEOA) are used as the photosensitizer and electron donor, respectively.…”

Encapsulation of Porphyrin‐Fe/Cu Complexes into Coordination Space for Enhanced Selective Oxidative Dehydrogenation of Aromatic Hydrazides

“…[ 29,30 ] The Cu 2p XPS signals appeared at 935.58 and 954.29 eV for Cu 2p 3/2 and Cu 2p 1/2 , respectively (Figure S16, Supporting Information). [ 31 ] The C 1s peaks of HZ@TCPP‐Fe and HZ@TCPP‐Fe/Cu can be fitted into C=C (284.43 eV), C=N (285.55 eV), C−O (286.58 eV), and C=O (288.06 eV) (Figure 2g). [ 32,33 ] The N 1s peaks could be assigned to oxidized N species (NO 3 − ) (406.57 eV) and 2‐methylimidazole (399.48 eV) (Figure 2h).…”

Interface Engineering of Co‐LDH@MOF Heterojunction in Highly Stable and Efficient Oxygen Evolution Reaction

“…[16] It has uniform pore diameter distribution and ultrahigh surface area, making it a feasible choice for endowing the electrocatalyst with the structural advantages of large surface areas and reasonably distributed pores to improve its catalytic performance. [17][18][19][20] Scheme 1. Schematic illustration of growth pathway to prepare Co-LDH@ZIF-67, Co-LDH, and ZIF-67.…”