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Preparation method of thiourea-modified SiO2 composite material, product thereof, and application of product

A composite material and thiourea-based technology, applied in chemical instruments and methods, silicon compounds, and other chemical processes, can solve the problems of reduced palladium recovery rate, various raw material components, and complicated modification operations, and achieve the same adsorption performance , easy coordination, good selectivity

Inactive Publication Date: 2019-10-22
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Modification of SiO with thiourea groups 2 The composite material is prepared as follows:

[0022] 1) Add 60g of chromatographic silica gel and 500mL of 6mol / L hydrochloric acid solution into a 1000mL three-neck flask, heat to 110°C, stir and reflux for 8h, wash it with a large amount of deionized water until neutral after the reaction is completed, and place it at 110°C Drying for 12 hours under the hood to obtain activated silica gel.

[0023] 2) Weigh 5.0g of activated silica gel in a 250mL three-neck flask, add 100mL of toluene as a solvent, add 5mL of γ-aminopropyltriethoxysilane under stirring conditions, and finally add 0.2mL of aniline, and heat Stir and reflux the reaction at 110°C for 24 hours. After suction filtration, dry the solid in a drying oven at 110°C for 12 hours. The dried product taken out is amino silica gel.

[0024] 3) Weigh 1.5g of NaOH in a 250mL three-necked flask, add 120mL of absolute ethanol as a solvent, and dissolve it fully under heat...

Embodiment 2

[0026] Modification of SiO with thiourea groups 2 The composite material is prepared as follows:

[0027] 1) Add 60g of chromatographic silica gel and 500mL of 1mol / L sulfuric acid solution into a 1000mL three-neck flask, heat to 120°C, stir and reflux for 24h, wash it with a large amount of deionized water until neutral after the reaction is completed, and place it at 110°C Drying for 12 hours under the hood to obtain activated silica gel.

[0028] 2) Weigh 5.0g of activated silica gel in a 250mL three-neck flask, add 100mL of toluene as a solvent, add 5mL of γ-aminopropyltriethoxysilane under stirring conditions, and finally add 0.2mL of aniline, and heat Stir and reflux at 110°C for 24 hours, and then dry in a drying oven at 110°C for 12 hours after suction filtration. The dried product taken out is amino silica gel.

[0029] 3) Weigh 1.5g of NaOH in a 250mL three-neck flask, add 120mL of absolute ethanol as a solvent, and dissolve it fully under heating and stirring to ...

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PUM

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Abstract

The invention discloses a preparation method of a thiourea-modified SiO2 composite material, a product thereof, and an application of the product. Activated silica gel is aminated to obtain an amino group-containing silica gel composite material, and the amino group-containing silica gel composite material is further modified with allyl thiourea to obtain the thiourea-modified SiO2 composite material. The thiourea-modified silica gel composite material prepared in the invention has a high adsorption rate to palladium ions, has a good selectivity to ions in a solution, can be reused multiple times, and keeps the adsorption performance substantially unchanged when reused.

Description

technical field [0001] The invention belongs to the field of separation, recovery and utilization of palladium ions, in particular to a SiO modified with thiourea group 2 Preparation methods of composite materials and their products and applications. 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 chemical catalysis, aerospace, microelectronics technology, exhaust gas purification It plays a key and central role in cutting-edge science and modern industries such as petrochemical, electrical and electronic, environmental protection, biopharmaceuticals, and national defense. With the increasing importance of environmental protection and the in-depth development and application of catalysts, the demand for metal palladium is growing rapidly. Facing the sustainable utilization of resou...

Claims

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Application Information

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IPC IPC(8): B01J20/10C02F1/28B01J20/30
CPCB01J20/103C02F1/281
Inventor 李敏冯建肖鹏蒋松山孟晓静唐思
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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