Studies and development of morphology-controlled synthesis of I−V−VI ternary semiconductor chalcogenide nanostructures with the use of earth-abundant, less toxic, and more environmentally friendly metals are in the forefront of current research due to their remarkable physical, chemical, and optoelectronic properties. Herein, we report the solvothermal synthesis of a ternary metal chalcogenide nanostructured material, wittichenite (Cu 3 BiS 3 ) with 1D, 2D, and 1D−2D morphologies at three different temperatures, using the deep eutectic solvent (DES) of choline chloride/thiourea (ChCl/TU). The unique advantages of DES are that it acts as a safer solvent, an in situ source of sulfur, and a nonaqueous soft template for making the reaction system much simpler. The synthesis temperature plays a key role in the morphological evolution and anisotropic growth of copper-bismuthsulfide nanostructures via oriented attachment, self-assembly, and Ostwald ripening mechanisms. The as-synthesized nanostructures of Cu 3 BiS 3 exhibit multifunctional features, including photoconductivity, photothermal and catalytic activity for 4-nitrophenol reduction. This work provides a unique strategy for the design and synthesis of morphology-controlled metal chalcogenide nanostructures using DES as an "all-in-one" reactant, template, and green reaction medium.

We report a chelating agent‐assisted synthesis of Bi2WO6 nanomaterials using a facile hydrothermal method. The presence of a chelating agent (EDTA) influences the degree of crystallinity, morphology, and surface area of Bi2WO6. Analysis by electron microscopy revealed morphological changes of Bi2WO6 from flower‐like to multilayered disc‐like structures after introducing EDTA. The surface area of pristine Bi2WO6 NMs is significantly increased from 31 to 50 m2 g−1. We demonstrated the catalytic properties of Bi2WO6 and EDTA‐Bi2WO6 for 4‐nitrophenol (4‐NP), methyl orange (MO), congo red (CR), and [Fe(CN)6]3− reductions in the presence of NaBH4. It was observed that EDTA‐Bi2WO6 exhibited higher catalytic activity compared to the pristine Bi2WO6 NMs. The reduction reactions followed pseudo‐first‐order kinetics and the rate constant values of EDTA‐Bi2WO6 for 4‐NP, MO, CR, and [Fe(CN)6]3− reductions were found to be 0.847, 0.584, 0.702, and 0.463 min−1, respectively. The reduction proceeds through electron transfer process over an EDTA‐Bi2WO6 catalyst in the presence of NaBH4. Furthermore, EDTA‐Bi2WO6 also showed ultrafast catalytic performance to dichromate (Cr2O72−) reduction, compared to pristine Bi2WO6. The EDTA‐Bi2WO6 catalyst could be recycled up to five times without undergoing a significant loss in activity.

Thiol-ene/yne click reactions play a significant role in creating carbon-sulfur (C-S) bonds, and there has been a growing interest in using visible-light photoredox catalysis for their formation. In this study,...