Synergistic Effect of CdS and NH₂‐UiO‐66 on Photocatalytic Reduction of CO₂ under Visible Light Irradiation

Abstract

Photocatalytic reduction of CO 2 has drawn much attention as a promising way that can effectively alleviate the issue of global warming and energy crisis. In this work, we fabricated a series of CdS/NH 2 -UiO-66 composites with varied CdS amounts and tested their capacity for photocatalytic reduction of CO 2 . The reactions were performed in a solvent-free system and displayed excellent selectivity for CO production without liquid phase products. When the content of CdS in the composite is up to 40 %, the hybrid catalyst produces 105.41 μmol/g within 6 h, exhibiting remarkable photocatalytic performance, which is much higher than that catalyzed by mechanically mixed CdS and NH 2 -UiO-66. The brilliant catalytic performance of the composite catalyst is attributed to the formation of heterostructure between the well-dispersed CdS and NH 2 -UiO-66, which promotes the enhancement of electron transfer during photocatalysis. Figure 7. Proposed mechanism of photocatalytic reduction of CO 2 by the CdS/NH 2 -UiO-66 composite photocatalyst under visible light irradiation.

Effect of the Defect Modulator and Ligand Length of Metal–Organic Frameworks on Carbon Dioxide Photoreduction

“… Moreover, the effective photoelectron evolution rate of UiO-66-NH 2 -2ABA reaches 35 μmol g –1 h –1 (Figure a), higher than that of other previously reported photocatalysts such as CdS-decorated UiO-66-NH 2 , MIL-MOFs, and some inorganic materials (Table S3). ,,− Meanwhile, the contributions of the individual components in achieving the catalytic activity of UiO-MOFs toward CO 2 photoreduction were assessed by various controlled experiments, verifying that the existence of the catalyst, TEOA, and light is crucial for achieving effective CO production. Further, the photostability of UiO-66-NH 2 -2ABA was evaluated by recycling experiments, as shown in Figure b, and the catalytic stability is still maintained even after multiple uninterrupted cycles, and the crystalline structure and morphology of UiO-66-NH 2 -2ABA are confirmed by PXRD and SEM images to have no noticeable alteration (Figure S20).…”

Tailoring defect-type and ligand-vacancies in Zr(iv) frameworks for CO2 photoreduction

“…Pristine UiO-66-NH 2 was synthesized as previously reported with slight modification, 29 using 46.6 mg (0.2 mmol) of ZrCl 4 and 36.2 mg (0.2 mmol) of ATA in 10 mL of DMF reacted at 120 °C for 24 h under solvothermal conditions. The solid product was obtained by centrifugation, washed with DMF, EtOH and acetone, and then dried at 150 °C for 12 h.…”

Recent progress of theoretical studies on electro- and photo-chemical conversion of CO2with single-atom catalysts

“…XTaO 3 (X = Li, Na, K), InVO 4 , ZnGa 2 O 4 , etc. ; 120–125 (2) metal sulfides such as XS (X = Cd, Zn); 126–129 (3) metal nitrides such as GaN, 130 TaON; 131 (4) layered metal hydroxides (referred to as LDH), such as FeNi-LDH/g-C 3 N; 132 (5) metal organic framework materials (MOFs), such as MOF-525-Co; 133 (6) non-metallic semiconductors, such as g-C 3 N 4 , 134 and graphene. 135…”