Synthesis, Crystal Structure, and Excellent Selective Pb2+ Ion Adsorption of New Layered Compound (NH4)In3(SO4)2(OH)6. Issue 47 (10th December 2019)

• Record Type: Journal Article
• Authors: Zhao, Yu; Hu, Keyan; Wang, Dong; Zhang, Shaoning; Wang, Peng; Dong, Wujie; Chen, Haijie; Zhao, Wei; Huang, Fuqiang
• Is Part Of: European journal of inorganic chemistry. Issue 47(2019)
• Page Start: 5000
• Page End: 5007
• Publication Date: 2019-12-10
• Subjects: Hydrothermal synthesis -- Layered compounds -- Alunite -- Structure elucidation -- Lead; Chemistry, Inorganic -- Periodicals; Organometallic chemistry -- Periodicals; Bioinorganic chemistry -- Periodicals; Solid state chemistry -- Periodicals; 546
• DOI: 10.1002/ejic.201901015
• Languages: English
• ISSNs: 1434-1948

Abstract

Abstract : (NH4 )In3 (SO4 )2 (OH)6, a new indium incorporated synthetic compound belonging to the alunite supergroup, is successfully prepared by hydrothermal reaction. The crystal structure is determined by single‐crystal X‐ray diffraction. (NH4 )In3 (SO4 )2 (OH)6 crystallizes in space group R 3 m of a = b = 7.69(8) Å, c = 17.71(2) Å and Z = 3, and it adopts a layered structure with alternating corrugated two‐dimensional 2 ∞ [In3 (SO4 )2 (OH)6 – ] anionic network and interstitial NH4 + ions. The measurements of X‐ray powder diffraction pattern, Fourier transform infrared spectroscopy spectrum, differential Scanning Calorimeter and X‐ray photoelectron spectroscopy have been performed on this new compound. The title compound is air‐ and water‐stable and starts thermal decomposition to In2 O3 at 620 K. Interstitial NH4 + ions between two‐dimensional 2 ∞ [In3 (SO4 )2 (OH)6 – ] layers are exchangeable by cations like Pb 2+ . The maximum adsorption capacity of Pb 2+ ions reaches 990 mg/g at pH 6.5, and the selectivity is observed with a very high distribution coefficient Kd of 1.1 × 10 6 mL/g compared with other completive cations. The unique layered framework composed of [InO6 ] 9– octahedra and [SO4 ] 2– tetrahedra is chemically stable to enable excellent cycling performance. This investigation will advocate the alunite supergroup minerals for efficient and recyclable adsorption of toxic metal ions in contaminated water. Abstract : A novel compound (NH4 )In3 (SO4 )2 (OH)6 with excellent ion exchange property was successfully prepared. The crystal structure consists of a layered structure with alternating corrugated 2D 2 ∞ [In3 (SO4 )2 (OH)6 – ] anion network and interstitial NH4 + ions. The obtained compound exhibited an impressive saturation adsorption capacity of 990 mg/g at pH 6.5 towards Pb 2+ ions, high Kd value of 1.1 × 10 6 mL/g and excellent cycling performance.