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Crystalline organic hybrid metal chalcogenides have exhibited effective photocatalytic degradation ability for organic pollutants. However, few strategies have been applied to enhance its inherent photocatalytic degradation activity. Here, we used an organic hybrid indium sulfide [In 8 S 13 (S) 1/2 (SH)][In 4 S 6 (S 3) 1/2 (SH)](TMDPH 2) 5 (HCF-1) (TMDP = 4,4′-trimethylenedipiperidine) as pristine material, by immersing HCF-1 into AgNO 3 solution, the surface of HCF-1 crystal was decorated by Ag+ ions via electrostatic interaction. Compared with the pristine HCF-1, the as-modified Ag@HCF-1 exhibited enhanced photocatalytic degradation performance for organic dyes (RhB and MO) and antibiotics (TC and ENR). The decoration of Ag+ ions on the surface of HCF-1 can broaden the range of light absorption, and promote the separation of photo-generated carriers, and thus boost the photocatalytic activity. In addition, photocatalytic mechanism was studied by free radical capture experiments, which proved the dominant roles of h+ and •O 2 − in the degradation process. [Display omitted] • The surface of an organic hybrid indium sulfide was modified by Ag + ion decoration. • Ag@HCF-1 displayed enhanced photocatalytic degradation ability for organic dyes and antibiotics. • Mechanism study proved the dominant roles of h+ and.•O 2 − in the degradation process. [ABSTRACT FROM AUTHOR]

[Display omitted] • A two-dimensional layered organic hybrid selenidostannate was used as a photocatalyst for Cr(VI) reduction. • NPTS@PANI-15 exhibited excellent photocatalytic Cr(VI) reduction performance in different water bodies. • NPTS@PANI-15 can reduce 100% of Cr(VI) (100 mg/L) within 15 min under sunlight irradiation. • The Cr(VI) reduction can take place in the interior of NPTS crystal. Given the threat of Cr(VI) to the environment and human health, it is urgent to develop new photocatalysts for efficient photocatalytic reduction of Cr(VI). Herein an organic hybrid selenidostannate [Ni(phen) 3 ][Sn 3 Se 7 ]·1.5H 2 O (NPTS) was coupled with polyaniline (PANI) to form NPTS@PANI- x (x = 15, 50, 100) composites, where all the NPTS@PANI- x composites surprisingly exhibited excellent photocatalytic performances for Cr(VI) reduction. In particular, NPTS@PANI-15 can reduce 100% of Cr(VI) (100 mg/L) in 10 min. Moreover, NPTS@PANI-15 possesses a strong ability to resist interference from various anions, cations, and NOM. In addition, under sunlight irradiation, NPTS@PANI-15 can reduce 100% of Cr(VI) (100 mg/L) in 15 min. The superior photocatalytic performance of NPTS@PANI-15 can be attributed to three factors: Firstly, the large distance between the [Sn 3 Se 7 ] n 2n– layers could offer sufficient space for transporting Cr(VI) into the interlayers; Secondly, the [Ni(phen) 3 ]2+ cations located between the [Sn 3 Se 7 ] n 2n– layers can interact with Cr(VI) oxyanions via electrostatic attraction, and thereby promote the adsorption of Cr(VI); and Thirdly, the coupling of NPTS and PANI accelerates the separation rate of electron-hole pairs, which facilitates the Cr(VI) reduction process. Our research demonstrates that organic hybrid metal chalcogenides can be used as a new type of high efficiency photocatalyst for Cr(VI) reduction. [ABSTRACT FROM AUTHOR]

In the synthesis of organic hybrid metal chalcogenides, piperazine (pip) has been widely applied as a template or charge-balancing agent in the structure assembly, but application of piperazine as a solvent to synthesize organic hybrid metal chalcogenides has not been reported. In this work, two new two-dimensional layered organic hybrid silver chalcogenidoantimonates, namely [pipH 2 ] 0.5 [Ag 2 SbS 3 ] (1), [pipH 2 ] 0.5 [Ag 2 SbSe 3 ] (2), have been synthesized by using piperazine as reaction medium. Both compounds possess the similar honeycombed anionic bilayers, and the biprotonated piperazine cations are resided between the bilayers. Thermal stabilities and optical properties of compounds 1 and 2 have been studied. Moreover, compounds 1 and 2 exhibited excellent photocatalytic activities for reducing aqueous Cr(VI) under visible light irradiation. [Display omitted] • Two new silver chalcogenidoantimonates were prepared by using piperazine as reaction medium. • Both compounds showed excellent photocatalytic activity for reducing Cr(VI) under visible light irradiation. • The effects of pH value and initial concentration on the catalytic performance were studied. [ABSTRACT FROM AUTHOR]