Fiber-based adsorption material and preparation method thereof and application of fiber-based adsorption material in palladium recovery

An adsorption material and fiber-based technology, applied in the field of fiber-based adsorption materials and their preparation, can solve the problems of poor practical applicability, reduced reactivity, and poor practicability, and achieve efficient adsorption and recovery, high adsorption efficiency, and practicality strong effect

Active Publication Date: 2021-07-27
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN109438719A discloses and a kind of modified metal organic framework composite material is used for the palladium ion in the adsorption solution, and the method is simple, but the practicability is not strong
CN110394157A discloses a kind of UiO-66-NH for adsorbing palladium 2 Composite material and its preparation method. This patent proposes to modify UiO-66-NH2 with alginic acid to improve its hydrodynamic properties. In this technology, the amount of alginic acid is not easy to control, and alginic acid is easy to coat UiO-66-NH2 2 , reducing its reactivity
A SiO 2 As the adsorbent material of the matrix, it physically coats the metal-organic framework on the SiO 2 Surface, easy to fall off, poor practicality

Method used

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  • Fiber-based adsorption material and preparation method thereof and application of fiber-based adsorption material in palladium recovery

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Experimental program
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Effect test

Embodiment 1

[0025] According to method A, 10g of polyacrylonitrile fiber was immersed in 180mL of diethylenetriamine solution, heated and stirred at 130°C under reflux for 5 hours, and the obtained product was washed until neutral. Submerge the washed product (fiber) in absolute ethanol, add 20 g of bromoacetic acid and adjust the pH of the solution to 10 with sodium hydroxide, reflux at 80° C. for 10 hours, and the obtained product is a modified polyacrylonitrile fiber. The modified polyacrylonitrile fibers were immersed in a mixed solvent composed of 50 mL of water and 50 mL of DMF, and activated by adding 0.008 mol of EDC and 0.008 mol of NHS at 30° C. for 1 hour. Disperse 2.36g of zirconium chloride and 2.55g of 2-aminoterephthalic acid in a mixed solvent composed of 90mL of water and 90mL of N'N-dimethylformamide, add activated modified polyacrylonitrile fibers, and heat at 120°C Reflux for 24 hours, filter and soak with ethanol, and the resulting solid was vacuum-dried at 60°C for 1...

Embodiment 2

[0027] The operation steps are the same as those in Example 1, the difference being that 4.05g of chromium nitrate (nonahydrate) is used as the metal salt to replace zirconium chloride when preparing the fiber-based adsorbent material, and the fiber-based adsorbent material is marked as PAN-MOF2.

Embodiment 3

[0029] According to method B, add 2.36g of zirconium chloride and 2.55g of 2-aminoterephthalic acid into 200mL of DMF in sequence, disperse ultrasonically for 20 minutes, and keep it airtight at 120°C for 20 hours. After cooling to room temperature, use ethanol to centrifuge. Vacuum dry at 70°C for 12 hours to obtain solid powder; 10g of polyacrylonitrile fiber was immersed in 180mL of diethylenetriamine, heated, stirred and refluxed at 130°C for 5 hours, and the obtained product was washed until neutral. Submerge the washed product (fiber) in absolute ethanol solvent, add 20 g of chloroacetic acid and adjust the pH of the solution to 10 with sodium hydroxide, reflux at 80° C. for 10 hours, and the obtained product is modified polyacrylonitrile fiber. Immerse the modified polyacrylonitrile fiber in a mixed solvent composed of 90mL water and 90mL DMF, add 0.008mol EDC·HCl and 0.008mol NHS, stir and activate at 30°C for 1 hour, add solid powder, and reflux at 70°C for 20 hours ,...

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Abstract

The invention provides a fiber-based adsorption material. The fiber-based adsorption material is prepared by grafting a metal organic framework on polyacrylonitrile fibers, which serves as a matrix, through a chemical bonding method. The material disclosed by the invention combines the advantages of the fibers and the metal organic framework, and a chemical bonding mode is firmer than physical mixing; and the material is suitable for dynamic adsorption, is relatively high in practicability, and can realize efficient adsorption and recovery of palladium ions. The fiber-based adsorption material provided by the invention realizes selective adsorption of palladium ions and has high adsorption efficiency. According to a method for recovering palladium in the invention, the steps of calcination, alkali fusion and the like in a traditional method and the use of a strong oxidant are avoided, cost is low, and large-scale application can be achieved.

Description

technical field [0001] The invention belongs to the field of recycling and utilization of precious metal resources, and relates to the adsorption and recovery of palladium ions, in particular to a fiber-based adsorption material, a preparation method thereof, and an application for recovering palladium. Background technique [0002] As a precious metal with high industrial demand but scarce reserves, palladium has good corrosion resistance, high conductivity, thermal stability and catalytic activity, and is widely used in corrosion-resistant materials, catalysts, jewelry, and electrical and electronic components. It is an indispensable key material in high-tech fields such as aerospace, aviation, navigation, weapons and nuclear energy, as well as in the automobile manufacturing industry. With the rapid update of electronic products and electrical equipment, deactivated catalysts and waste electronic equipment have become important sources for people to recover precious metal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30D06M15/37C22B7/00C22B11/00D06M101/28
CPCB01J20/265D06M15/37C22B7/005C22B11/042B01J2220/4812D06M2101/28Y02P10/20
Inventor 冯建谢蒙李敏徐德容唐贞珍
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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