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A kind of nano-palladium-silver alloy catalytic material for catalytic reduction of nitrate in water and its preparation method and application

A catalytic material, palladium-silver alloy technology, applied in chemical instruments and methods, reduced water/sewage treatment, nanotechnology for materials and surface science, etc., can solve the problem that nitrate has not been eliminated and is difficult to be widely used and treated Low efficiency and other problems, to achieve the effect of easy operation, easy industrial production, and simple equipment

Active Publication Date: 2020-08-11
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the physical method is widely used in industry, the nitrate has not been eliminated, but only collected, and post-processing is still required
The treatment efficiency of biological method is very low, it is difficult to widely apply

Method used

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  • A kind of nano-palladium-silver alloy catalytic material for catalytic reduction of nitrate in water and its preparation method and application
  • A kind of nano-palladium-silver alloy catalytic material for catalytic reduction of nitrate in water and its preparation method and application
  • A kind of nano-palladium-silver alloy catalytic material for catalytic reduction of nitrate in water and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 10 grams of dry silicon oxide to 400 milliliters of absolute ethanol, stir for 0.5 hours, add 1 milliliter of 3-aminopropyltriethoxysilane, put it in a 70 ° C water bath, stir for 24 hours by reflux, and then wash , and dried in vacuum at 40°C for 12 hours to obtain amino-modified silica. Add 0.22 g of sodium chloride and 0.167 g of palladium chloride into 40 ml of deionized water, and sonicate for 10 minutes, at which time the palladium chloride is completely dissolved to obtain a sodium chloride solution of palladium chloride. Take a beaker, add 500 ml of deionized water, add the prepared amino-modified silicon oxide, after stirring evenly, add the sodium chloride solution of palladium chloride, saturated adsorption at room temperature for 1 hour, then add 40 ml of dissolved 2 grams of fresh solution of potassium borohydride, continue to stir for 0.5 hours, rinse 3-5 times with 50 milliliters of deionized water, and dry in a vacuum oven at 40°C for 12 hours.

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Embodiment 2

[0046] Add 1 kg of dry silicon oxide to 40 liters of absolute ethanol, stir for 0.5 hours, add 100 ml of 3-aminopropyltriethoxysilane, put it in a 70°C water bath, stir for 24 hours by reflux, and then wash , and dried in vacuum at 40°C for 12 hours to obtain amino-modified silica. 22 grams of sodium chloride and 16.7 grams of palladium chloride were added to 4 liters of deionized water, and ultrasonication was performed for 10 minutes. At this time, the palladium chloride was completely dissolved to obtain a sodium chloride solution of palladium chloride. Take a beaker, add 50 liters of deionized water, add amino-modified silicon oxide, stir evenly, add the sodium chloride solution of palladium chloride, saturated adsorption at room temperature for 1 hour, then add 4 liters of dissolved 200 grams The fresh solution of potassium borohydride was continuously stirred for 0.5 hours, washed 3-5 times with 5 liters of deionized water, and dried in a vacuum oven at 40°C for 12 hours...

Embodiment 3

[0049] Add 178 milliliters of deionized water in the 200 milliliter flask, get the PdAg / SiO that 0.4 gram embodiment 1 prepares 2 -NH 2 Catalyst, ultrasonically dispersed for 5 minutes, passed nitrogen for 15 minutes to remove dissolved oxygen in water, then added 20 ml of nitrate and 2 ml of formic acid / sodium formate solution, tightly stoppered, and stirred under closed conditions. figure 2 It shows the results of nitrate reduction catalyzed by the catalyst under different formic acid and sodium formate concentrations.

[0050] a. When the concentration of nitrate in water is 100 mg / liter, and the concentration ratio of formic acid / sodium formate is 8 / 2 mmol / liter, the concentration of nitrate in water after 1 hour of reaction is 23 mg / liter.

[0051] b. When the concentration of nitrate in water is 100 mg / liter, and the concentration ratio of formic acid / sodium formate is 8 / 4 mmol / liter, the concentration of nitrate in water after 1 hour of reaction is 7 mg / liter.

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Abstract

The invention discloses a nano palladium-silver alloy catalytic material for catalytic reduction of nitrate radicals in water and a preparation method and an application thereof, and belongs to the fields of environmental protection technology and nano material preparation technology. A silver element is successfully introduced into palladium nanoparticles by a technology means of combining surface modification with sequential continuous reduction, and palladium-silver alloy nanoparticles with the size of 2-5 nm are uniformly loaded on an amino modified silica carrier. Under a condition with formic acid as a reducing agent, the palladium-silver alloy nano catalytic material can well decompose formic acid to produce an in situ hydrogen source and a buffer agent carbon dioxide, thereby improving the reaction rate and selectivity for catalytic reduction of the nitrate radicals, so as to solve the problems of hydrogen gas leakage, high requirements of reaction equipment in common hydrogen reduction process, especially poor selectivity of traditional unit catalytic materials.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and preparation of nanometer materials, and in particular relates to a nano-palladium-silver alloy catalytic material for catalyzing the reduction of nitrate in water, a preparation method and application thereof. Background technique [0002] Due to the rapid development of industry and agriculture, underground and surface water has been seriously polluted, especially the excessive discharge of chemical companies and excessive fertilization in agriculture, resulting in a sharp increase in nitrate content in water. High concentrations of nitrates in drinking water pose serious hazards to human health. Nitrate is converted into nitrite by nitrate-reducing bacteria in the human body, and nitrite will react with hemoglobin in the blood, which has the function of transporting oxygen, to form methemoglobin, thereby affecting the oxygen transport capacity in the blood. In adult blood, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B82Y30/00C02F1/70
CPCB01J23/44B01J23/50B82Y30/00C02F1/70C02F2101/163
Inventor 李琦杨炜沂丁亚军孙武珠
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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