Fatty acid-based extractant for heavy metal ions as well as preparation method of extractant and extraction method of heavy metal ions

A technology for heavy metal ions and fatty acids, applied in separation methods, solvent extraction, chemical instruments and methods, etc., can solve problems such as difficulty in large-scale operation, large viscosity of ionic liquid, affecting efficiency, etc. Simple to use effects

Active Publication Date: 2019-10-18
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic liquids selected for this type of method generally have relatively high viscosity, and there are certain difficulties in large-scale operation, which affects its efficiency. The cost of using ionic liquids as extraction agents is also high.

Method used

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  • Fatty acid-based extractant for heavy metal ions as well as preparation method of extractant and extraction method of heavy metal ions
  • Fatty acid-based extractant for heavy metal ions as well as preparation method of extractant and extraction method of heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 1.4mL of 2mol / L NaOH solution to 5mL (about 0.028mol) heptanoic acid, which contains 0.0028mol of NaOH, that is, the molar ratio of nonanoic acid to NaOH is about 10:1, and shake to form a mixed solution; the mixed solution is added to 10mL contains 0.12mol / L copper ion (Cu 2+ ) in the aqueous solution, adjust the pH of the water phase to 6.0, and stir vigorously; 2+ That is, it is removed, and the removal rate is 99.60%.

Embodiment 2

[0047] Add 2.4mL of 2mol / L NaOH solution to 5mL (about 0.032mol) of octanoic acid, which contains 0.0048mol of NaOH, that is, the molar ratio of octanoic acid to NaOH is about 10:1.5, and shake to form a mixed solution; this mixed solution is added to 20mL containing 0.10mol / L mercury ion (Hg 2+ ) in the aqueous solution, adjust the pH of the water phase to be 6.0, stir vigorously; let stand to separate the liquid, and the Hg in the waste water 2+ That is to be removed, the removal rate is 95.34%.

Embodiment 3

[0049] Add 5.0mL of 2mol / L NaOH solution to 5mL (about 0.034mol) of heptanoic acid, which contains 0.010mol of NaOH, that is, the molar ratio of heptanoic acid to NaOH is about 10:3, and shake to form a mixed solution; add the mixed solution respectively to volumes of 10mL containing nickel ions (Ni 2+ ), lead ions (Pb 2+ ), silver ions (Ag + ), cadmium ions (Cd 2+ ) in the aqueous solution, the metal ion concentration is 0.4mol / L, 0.4mol / L, 0.8mol / L, 0.4mol / L respectively, after mixing, the pH of the water phase is adjusted to 7.0, 5.5, 5.5, 6.0 respectively, vigorously stirred, static After separating the liquid, the metal ions are recovered and removed, and the removal rates are 98.28%, 94.58%, 95.54%, and 98.57%, respectively. In this example, with Ni 2+ 、Ag + 、Cd 2+ Formed phase-separated samples such as figure 1 As shown, it can be seen that heptanoate binds metal ions (Ni 2+ 、Ag + 、Cd 2+ ) was extracted into the upper oil phase by heptanoic acid to form a visc...

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Abstract

The invention provides a fatty acid-based extractant for heavy metal ions, a preparation method of the extractant and an extraction method of the heavy metal ions. The preparation method comprises thefollowing steps: uniformly mixing a fatty acid and an alkaline solution, and performing a reaction to obtain the fatty acid-based heavy metal ion extractant, wherein the fatty acid is one or more selected from the group consisting of hexanoic acid, heptanoic acid, caprylic acid and nonanoic acid. In the extractant for the heavy metal ions provided by the invention, the fatty acid salt reacts withthe high-valence heavy metal ions to be extracted, the high-valence heavy metal ions are combined with fatty acid radicals, the product is dissolved into the fatty acid to form an upper phase, thus the heavy metal ions are extracted from a lower-phase water phase, separation can be realized through simple liquid separation, the operation is simple, and the removal speed is rapid.

Description

technical field [0001] The disclosure belongs to the field of waste water treatment and metal recovery, and relates to a fatty acid-based heavy metal ion extraction agent, a preparation method and an extraction method. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] With the development of industrialization, resource and environmental issues are increasingly attracting people's attention. The chemical industry and metal smelting industry will produce a large amount of wastewater in the production process, which still contains a large amount of metal ions, especially heavy metal ions, which can cause serious environmental pollution and a great waste of resources. Therefore, it is very important for the removal and recovery of metal ions in wastewater. [0004] At present, there are two types of purification methods for wastewater containing heav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D11/04C02F1/26C02F101/22
CPCB01D11/0492C02F1/26C02F2101/22
Inventor 郝京诚宋爱新吴志芳余利
Owner SHANDONG UNIV
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