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Compared with the traditional liquid-liquid extraction method, solid-phase extraction agents are of great significance for the recovery of indium metal due to their convenience, free of organic solvents, and fully exposed activity. In this study, P 2 O 4 (di-2-ethylhexyl phosphoric acid) was chemically modified by using UiO-66 to form the solid-phase extraction agent P 2 O 4 -UiO-66-MOFs (di-2-ethylhexyl phosphoric acid-UiO-66-metal-organic frameworks) to adsorb In(III). The results show that the Zr of UiO-66 bonds with the P-OH of P 2 O 4 to form a composite P 2 O 4 -UiO-66-MOF, which was confirmed by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FT-IR). The adsorption process of indium on P 2 O 4 -UiO-66-MOFs followed pseudo first-order kinetics, and the adsorption isotherms fit the Langmuir adsorption isotherm model. The adsorption capabilities can reach 192.8 mg/g. After five consecutive cycles of adsorption-desorption-regeneration, the indium adsorption capacity by P 2 O 4 -UiO-66-MOFs remained above 99%. The adsorption mechanism analysis showed that the P=O and P-OH of P 2 O 4 molecules coated on the surface of P 2 O 4 -UiO-66-MOFs participated in the adsorption reaction of indium. In this paper, the extractant P 2 O 4 was modified into solid P 2 O 4 -UiO-66-MOFs for the first time. This work provides a new idea for the development of solid-phase extractants for the recovery of indium., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022. Published by Elsevier B.V.)

The tris(dimethyldithioarsinato) complexes M(S2AsMe2)3 (M = Al, Ga, In and Tl) have been prepared from NaS2AsMe2·2H2O as anhydrous powders. The Al and Ga, but not the In and Tl, complexes add water molecules seen in the IR(KBr) spectra. The Al and Ga coordinate, while the In and Tl complexes attract and polarize water in CDCl3 resulting in more than one signal for H2O in the 1H NMR spectra. All four complexes are desulfurized by Ph3P but the expected M(SAsMe2)3 are unstable and decompose to Me2As-S-AsMe2 and other products. [ABSTRACT FROM AUTHOR]