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We synthesized a new iodoargentate [Co(2,2′-bipy)3]Ag3I6 (1) (2,2′-bipy = 2,2′-bipyridine) via the reaction of AgI, KI, 2,2′-bipy and Co(NO3)2 in dimethylformamide (DMF) solvent at room temperature. The [Co(2,2′-bipy)3]3+ complex cation directs the formation of the 0 D cluster [Ag3I6]3− anion that features an irregular double-level gear wheel with a maximum diameter of 5.512 Å. The iodoargentate possesses the characteristics of semiconductors with a band gap of 2.03 eV. It exhibits excellent ion-exchange behavior for adsorbing crystal violet (CV) and methylene blue (MB), and it can function as a promising photocatalyst for degrading rhodamine B (RhB). The improved photocatalytic activity can be ascribed to the hole structure in the anions of iodoargentates. [ABSTRACT FROM AUTHOR]

Photocatalytic degradation of organic pollution by biochar was a sustainable strategy for waste water remediation, nevertheless, it still suffers drawbacks like low efficiency due to the poor photocatalytic properties of pristine biochar. Herein, amino groups were grafted on the edge sites/defects of biochar by Friedel-Crafts acylation to enhance the degradation of high concentration dye solutions. The results suggested that the amino groups played an important role in imparting photocatalytic properties to biochar. Owing to the strong Lewis basicity and electron-donating ability of amino groups, their interaction with oxygen-containing functional groups/aromatic structures in biochar was improved, which enhanced the electron exchange ability of biochar under visible light irradiation, resulting in excellent degradation performances of high concentration RhB (∼10 times faster than ungrafted biochar). In this work, amino-grafted garlic peel biochar delivered a new idea for the future direction of biochar-based photocatalysis in wastewater remediation. [Display omitted] • Preparation of amino-grafted biochar by Friedel-Crafts acylation. • Amino groups were grafted on the edge sites/defects of biochar. • Amino groups form electron exchange system with different structures of biochar. • Biochar can effectively degrade high concentration RhB as a photocatalyst. [ABSTRACT FROM AUTHOR]