Near-Infrared Photothermal Catalysis for Enhanced Conversion of Carbon Dioxide under Mild Conditions

Abstract

Enhanced conversion of carbon dioxide (CO2) for cycloaddition with epoxide derivatives is highly desired in organic synthesis and green chemistry, yet it is still a challenge to obtain satisfactory activity under mild reaction conditions of temperature and pressure. For this purpose, an unexploited strategy is proposed here by incorporating near-infrared (NIR) photothermal properties into multicomponent catalysts. Through the electrostatic adsorption of Co- or Ce-substituted polyoxometalate (POM) clusters on the surface of graphene oxide (GO) with covalently grafted polyethyleneimine (PEI), a series of composite catalysts POMs@GO-PEI are prepared. The structural and property characterizations demonstrate the synergistic advantages of the catalysts bearing Lewis acids and bases and local NIR photothermal heating from the GO matrix for dramatically enhanced CO2 cycloaddition. Noticeably, while the turnover frequency increases up to 2718 h–1, the heterogeneous catalysts exhibit photothermal stability and recyclability. With this method, the onsite NIR photothermal transformation becomes extendable to more green reaction processes.

Organophosphonic Acid-Regulating Assembly of PV–SbIII Polyoxotungstate and Its Potential in Building a Dual-Signal Readout Electrochemical Aptasensor for Carcinogen Detection

“…Simultaneously, it is worth highlighting that the Sb–O, P–O, W–O t , W–O b , and W–O c peaks in the IR spectrum of 1 @EGO are red-shifted by 5–14 cm –1 compared with 1 , while the N–H bending vibration peak in the IR spectrum of 1 @EGO red-shifts by 15 cm –1 in contrast to EGO, strongly indicating electrostatic interactions among 1a polyanions and EGO (Figure S9a). , Moreover, the ζ potential tests reveal the surface potentials of GO and EGO in aqueous solution are −29.1 and −16.2 mV, respectively (Figure S9b,c), showing that EN groups in EGO are successfully protonated (−NH 3 + and −NH 2 + ), which makes the surface potential of EGO decrease by 12.9 mV in comparison with GO. The composite of 1a polyanions with EGO increases the surface potential of 1 @EGO to −45.7 mV (Figure S9d).…”

“…This observation also proves strong electrostatic interactions between negatively charged 1a polyanions and positively changed EGO. 55,56 Furthermore, we employed the method of precipitating 1a polyanions (the resulting product is denoted as 1′) from water by adding Cs + ions to certify the stability of 1a polyanions in water. The test result shows that the IR spectrum of 1′ is almost consistent with that of 1, which testifies that the skeleton of 1a polyanions is stable in aqueous solution (Figure S10a).…”

Ionic-Nanophase Hybridization of Nafion by Supramolecular Patching for Enhanced Proton Selectivity in Redox Flow Batteries

“…The complete hydrolysis of FBC-21 was characterized by ATR-FTIR in representative membranes, where the characteristic peak of CO at 1631 cm –1 in FBC-21 slightly red shifts and finally disappears after the acid treatment (Figures S8 and b). For RN-3-3, characteristic absorption bands of W–O b –W at 891 cm –1 and W–O c –W 808 cm –1 in PW blue shift to 897 and 812 cm –1 after the acid treatment, respectively, which corresponds to the electrostatic interactions between POMs and organic ammoniums in the literature, − while the slight red shift of the asymmetric stretching vibration of −SO 3 – might be attributed to the combination of the electrostatic interactions with imines plus the hydrogen bonding with PW . The changeable noncovalent interactions among the three components were also clarified by XPS (Figure c,d).…”

NIR light‐propelled bullet‐shaped carbon hollow nanomotors with controllable shell thickness for the enhanced dye removal

“…Carbon-based nanomaterials are considered as a promising choice to construct micro/nanomotors due to their outstanding physiochemical properties, such as excellent photothermal effect, low density, high stability, and biocompatibility. [52][53][54][55][56][57] These merits endow them with promising applications in gas and polluted water treatment, catalysis, biomedical, and so on. [47,58,59] For the driving sources, light stimulation gradually becomes a promising choice to propel micro/nanomotor due to its high controllability, non-pollution, and low-cost.…”