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Preparation method of surface modified nano palladium/iron catalytic reducing agent

A surface modifier and surface modification technology, which is applied in the field of nano-environmental functional materials and water treatment, can solve the problems of reduced reactivity and easy oxidation, and achieve the effect of low energy consumption and simple process

Inactive Publication Date: 2012-08-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the strong reducibility of iron, iron-based nanoparticles are easily oxidized when they come into contact with oxygen in the air, resulting in a decrease in their reactivity.

Method used

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  • Preparation method of surface modified nano palladium/iron catalytic reducing agent
  • Preparation method of surface modified nano palladium/iron catalytic reducing agent
  • Preparation method of surface modified nano palladium/iron catalytic reducing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation method of guar gum modified nano-palladium / iron catalytic reducing agent and its removal effect to various chlorinated organics, the specific contents are as follows:

[0027] (1) Prepare FeCl with a concentration of 1.0mol / L 3 solution, add guar gum to the solution, and stir evenly, wherein the amount of guar gum added is FeCl 3 0.01% of the mass of the solution.

[0028] (2) Under a nitrogen atmosphere, a concentration of 3.1mol / L sodium borohydride solution was added dropwise to FeCl containing guar gum 3 solution (to ensure FeCl 3 completely with NaBH 4 Reaction, add excess NaBH according to the reaction equation 4 solution), stirring while dripping, until the sodium borohydride solution was added dropwise and continued to stir for 15 min, and the completely reacted solution was filtered through a Bush funnel equipped with a 0.22 μm microporous membrane, rinsed twice with deionized water and then drained , place the dried nano-iron...

Embodiment 2

[0034] Embodiment 2: the preparation method of soluble starch modified nano-palladium / iron catalytic reducing agent and its effect on the removal of various chlorinated organics, the specific contents are as follows:

[0035] (1) Prepare FeCl with a concentration of 0.8mol / L 3 solution, add soluble starch to the solution, and stir evenly, wherein the amount of soluble starch added is FeCl 3 0.15% of the mass of the solution.

[0036] (2) Under a nitrogen atmosphere, a concentration of 2.5mol / L sodium borohydride solution was added dropwise to FeCl containing soluble starch 3 solution (to ensure FeCl 3 completely with NaBH 4 Reaction, add excess NaBH according to the reaction equation 4 solution), stirring while dripping, until the sodium borohydride solution was added dropwise and continued to stir for 20 minutes, the solution that was completely reacted was filtered through a Bush funnel equipped with a 0.22 μm microporous membrane, rinsed with deionized water for 3 times...

Embodiment 3

[0042] Embodiment 3: the preparation method of polyethylene glycol modified nano-palladium / iron catalytic reducing agent and its effect on the removal of various chlorinated organics, the specific contents are as follows:

[0043] (1) Prepare FeCl with a concentration of 0.9mol / L 3 solution, add polyethylene glycol to the solution, and stir evenly, wherein the amount of polyethylene glycol added is FeCl 3 1.5% of the mass of the solution.

[0044] (2) Under a nitrogen atmosphere, a concentration of 3.5mol / L sodium borohydride solution was added dropwise to FeCl containing polyethylene glycol 3 solution (to ensure FeCl 3 completely with NaBH 4 Reaction, add excess NaBH according to the reaction equation 4 solution), stirring while dripping, until the sodium borohydride solution was added dropwise and continued to stir for 10 min, and the completely reacted solution was filtered through a Bush funnel equipped with a 0.22 μm microporous membrane, rinsed twice with deionized w...

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Abstract

The invention relates to a preparation method of a surface modified nano palladium / iron catalytic reducing agent. The nano palladium / iron catalytic reducing agent is prepared by using a liquid-phase deposition method; and by adding a surface modifier and coating the surface modifier on the outer layer of the catalytic reducing agent, hard agglomeration of the nano palladium / iron catalytic reducing agent in water is reduced. The nano palladium / iron catalytic reducing agent modified by the surface modifier has no flocculation phenomenon in water and higher dispersion degree. Compared with the normal nano palladium / iron catalytic reducing agent, the modified nano palladium / iron catalytic reducing agent prepared by the invention has the advantages of high particle purity, no oxidative inactivation phenomenon, small particle size, high catalytic reduction reaction activity and capability of increasing the removal rate for various chlorinated organic compounds in water by 9-24 percent compared with the unmodified nano palladium / iron catalytic reducing agent.

Description

technical field [0001] The invention relates to a preparation method of a surface-modified nano-palladium / iron catalytic reducing agent, in particular to a preparation method of a catalytic reducing agent for degrading chlorinated organic matter in water, and belongs to the technical field of nano-environmental functional materials and water treatment. Background technique [0002] Most of the chlorinated organic compounds (COCs) are highly toxic, refractory, and bioaccumulative in certain environments, causing direct damage and potential threats to the water environment and human health. There are many kinds of chlorinated organic compounds, which are important chemical raw materials, intermediates and organic solvents, so they are widely used in many industries. They enter the environment through volatilization, container leakage, waste water discharge, use of pesticides and insecticides, and combustion of chlorinated organic products, resulting in a large amount of chlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C02F1/70C02F101/36
Inventor 王向宇李芳祝敏平
Owner KUNMING UNIV OF SCI & TECH
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