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Chromium-based metal organic skeleton composite material for adsorbing and separating palladium and preparation methods of composite material

An organic framework and composite material technology, applied in chemical instruments and methods, and other chemical processes, can solve the problems of various raw materials, poor practicability, and cumbersome steps, and achieve improved hydrodynamic properties, saving production costs, and simple operations. Effect

Active Publication Date: 2019-11-01
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The different forms of palladium in palladium-containing waste liquid is one of the important reasons for the decrease of palladium recovery rate
[0004] CN107130114A discloses a method for the separation and recovery of palladium in palladium-containing waste liquid, which adopts chitosan derivatives and palladium waste liquid to form flocs to realize the separation of palladium and waste liquid, and the above-mentioned method is more loaded down with trivial details
CN 109438719 A discloses a modified metal-organic framework composite material and a preparation method. This patent proposes the concept of using a metal-organic framework modified material as an adsorption material, but the modification operation of the metal-organic framework material used in this technical solution Complex, with a wide variety of raw materials
A Chromium Terephthalate-Based Solid with Unusually LargePore Volumes and Surface Area, Science, 309 (2005) 2040-2042 reported a chromium-based metal-organic framework material, which adopted a hydrothermal synthesis method, but its publicly used There are many kinds of raw materials, cumbersome steps and poor practicability

Method used

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  • Chromium-based metal organic skeleton composite material for adsorbing and separating palladium and preparation methods of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to method A, add 12g of chromium nitrate (nonahydrate), 1.81g of 2-aminoterephthalic acid, 250mL of water and 50mL of N,N-dimethylformamide into a round-bottomed flask, mix well, and store at 150°C Stir and reflux reaction for 5 hours; after the reaction is completed, add 20 mL of sodium alginate aqueous solution with a mass concentration of 1% to the reaction mixture, stir well, then add hydrochloric acid to adjust the pH value to 1, filter with suction, and the obtained green precipitate is washed with After rinsing with liquid water, ethanol and acetone, the resulting solid was vacuum-dried at 80° C. for 6 hours to prepare a chromium-based metal-organic framework composite material, marked as Cr-MOF-AA1.

Embodiment 2

[0026] The operation steps are the same as in Example 1, the difference is that when preparing the chromium-based metal-organic framework composite material, the addition of chromium nitrate (nonahydrate) is changed to 4 g, the amount of water is changed to 100 mL, and the mass concentration of the sodium alginate aqueous solution is changed to 0.34 %, the final composite material is marked as Cr-MOF-AA2.

Embodiment 3

[0028] According to method B, 12g of chromium nitrate (nonahydrate) and 1.81g of 2-aminoterephthalic acid are added to 150mL of water, after stirring evenly, the mixed solution is transferred to a stainless steel reaction kettle equipped with a polytetrafluoroethylene liner, Let stand at 220°C for 24 hours, cool to room temperature and then centrifuge. The obtained green precipitate is soaked with washing liquid N,N-dimethylformamide and ethanol in turn, and then vacuum-dried at 150°C for 12 hours; the dried Disperse the solid in 200mL of water, disperse evenly by ultrasonic, add 20mL of sodium alginate aqueous solution with a mass concentration of 1% to the dispersion, add hydrochloric acid to adjust the pH value to 1, continue to stir for 6 hours, filter with suction, and wash the filter cake with After rinsing with liquid water, ethanol and acetone, the obtained solid was vacuum-dried at 80° C. for 6 hours to prepare a chromium-based metal-organic framework composite materia...

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Abstract

The invention discloses a chromium-based metal organic skeleton composite material for adsorbing and separating palladium. The composite material is composed of a chromium-based metal organic skeletonand alginic acid. The invention also discloses two preparation methods of the composite material. The preparation processes involved in the invention are simple to operate, and have mild conditions and low costs; and the chromium-based metal organic skeleton composite material prepared by the optimized preparation process realizes selective adsorption of the palladium ions, has large adsorption capacity, and can be reused.

Description

technical field [0001] The invention belongs to the field of separation, recovery and utilization of precious metals, in particular to a chromium-based metal-organic framework composite material for selectively adsorbing and separating palladium from palladium-containing wastes and a preparation method thereof. Background technique [0002] Palladium is a platinum group metal that can be used in electroplating, catalysts, dental alloys, brazing alloys and various contact materials. It has unique physical and chemical properties and is widely used in industrial catalysis, aerospace, microelectronics, exhaust gas purification It plays a key and central role in some cutting-edge science and modern industries such as petrochemical, electrical and electronic, environmental protection, biopharmaceuticals, and national defense. With the increasing awareness of environmental protection and the in-depth development and application of catalysts, the demand for metal palladium is growi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30
CPCB01J20/226
Inventor 冯建李敏肖鹏孟晓静蒋松山唐思汪麒林
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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