p-Toluenesulfonic Acid-Based Deep-Eutectic Solvents for Solubilizing Metal Oxides

被引：145

作者：

Rodriguez, Nerea Rodriguez ^{[1
,2
]}

Machiels, Lieven ^{[1
,2
]}

Binnemans, Koen ^{[1
]}

机构：

[1] Katholieke Univ Leuven, Dept Chem, Celestijnenlaan 200F,POB 2404, B-3001 Leuven, Belgium

[2] SIM Vzw, Technol Pk 935, B-9052 Zwijnaarde, Belgium

来源：

ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2019年 / 7卷 / 04期

关键词：

Deep-eutectic solvents; Ionic liquids; Metal oxides; Solvometallurgy; p-Toluenesulfonic acid monohydrate; CHOLINE CHLORIDE; IONIC LIQUIDS; PHYSICAL-PROPERTIES; ETHYLENE-GLYCOL; RARE-EARTHS; EXTRACTION; DISSOLUTION; SEPARATION; TEMPERATURE; MEDIA;

D O I：

10.1021/acssuschemeng.8b05072

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Combinations of p-toluenesulfonic acid monohydrate with different hydrogen-bond acceptors (i.e., choline chloride, tetraethylammonium chloride, tetrabutylammonium chloride, betaine hydrochloride, beta-alanine, tetrabutylphosphonium chloride, ethylammonium chloride, methyltriphenylphosphonium bromide, and benzyltriphenylphosphonium chloride) were tested for deep-eutectic solvent (DES) formation. Only p-toluenesulfonic acid monohydrate:choline chloride, p-toluenesulfonic acid monohydrate:tetrabutylammonium chloride, and p-toluenesulfonic acid monohydrate:tetrabutylphosphonium chloride at a 1:1 molar ratio remained liquid at room temperature. The obtained deep-eutectic solvents were characterized by determining their density and viscosity as a function of temperature and their thermal operational window (i.e., decomposition temperature and melting point/glass transition temperature). Moreover, IR spectroscopy was used to elucidate the formation of hydrogen bonds. The solubility of different metal oxides in the DES p-toluenesulfonic acid monohydrate:choline chloride was experimentally determined. The effect of the hydrogen-bond donor:hydrogen-bond acceptor molar ratio (2:1, 1:1, and 1:2) on metal oxide solubility was explored. A comparison was made with metal oxide solubilities in other choline chloride-based DESs and in acidic aqueous solutions.

引用

页码：3940 / 3948

页数：17

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