Chai Chaofan,Yang Xuefang,Yang Xiaohua,Dong Chuan,Bian Wei,Choi Martin M. F.
Abstract The utilization of nanomaterial-based probes in detecting glutathione (GSH) and cell imaging has aroused extensive attention owing to the excellent properties of nanoprobes. Herein, we have synthesized manganese dioxide-S, O co-doped graphitic carbon nitride quantum dots (MnO 2 -S, O-CNQDs) nanocomposite by in situ synthesis of MnO 2 nanosheets in S,O-CNQDs dispersion solution. It was found that GSH could specifically bind to MnO 2 -S, O-CNQDs so that the fluorescence of S, O-CNQDs could be recovered. As such, a “turn-on” MnO 2 -S, O-CNQDs nanoprobe can be fabricated and applied to rapidly determine trace amounts of GSH. Under the optimal conditions, MnO 2 -S, O-CNQDs shows sensitive response to GSH in the range 10–270 μM with a detection limit of 0.307 μM ( S / N = 3). The developed MnO 2 -S, O-CNQDs probe has demonstrated great potential to detection of GSH in biological samples and glutathione injections. What is more, MTT assay indicates that MnO 2 -S, O-CNQDs has low biotoxicity. The non-fluorescence MnO 2 -S, O-CNQDs reacts with GSH to recover the fluorescence of S, O-CNQDs in HepG2 cells. Thus, the “turn-on” fluorescence change of MnO 2 -S, O-CNQDs offers a potentially useful tool to monitor GSH of cancer cells. Graphical Abstract
Solar-driven CO 2 conversion into reusable carbon forms is an attractive strategy to. reduce CO 2 emissions and provide feedstocks for industrial production. However, most of present catalysts suffer from poor light utilization and rapid charge recombination, thus severely restricting the efficiency of CO 2 photoreduction. Herein, an innovative strategy of integrating Cs 3 Bi 2 Br 9 and MnO 2 via self-assembly was established, with the aim of designing a multimodal photothermal catalyst for CO 2 reduction under full spectrum. In this hybrid, MnO 2 could combine with CBB to create an S-scheme photocatalyst with promoted carrier separation, and simultaneously acted as a “heater” to facilitate CO 2 photoreduction by effective photothermal conversion. Upon UV–vis-NIR illumination, the CBB/MnO 2 hybrid presented an impressively high CO production rate (R CO = 189.75μmol g −1 h −1 ). Theoretical calculations combined with experimental tests indicated that the excellent catalytic activity of CBB/MnO 2 could be ascribed to the synergetic effect of greatly increased carrier transfer and high photothermal conversion efficiency, resulting in considerably enhanced solar-light-driven photothermocatalysis with no extra heat input. The as-proposed catalyst in this study provides a novel and effective approach to develop highly efficient photothermal catalysts for solar-to-fuel applications.
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