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Composite material of silver-silver halide supported iron nanometer minerals and preparation method for composite material

A composite material and silver halide technology, which is applied in the field of environmental wastewater pollution control, can solve problems such as unstable chemical properties, low specific surface area, and low conversion rate, and achieve the effects of short preparation cycle, low preparation cost, and increased contact area

Active Publication Date: 2018-01-05
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the single iron oxide type Fenton catalyst has low specific surface area, low activity, chemical instability and Fe 3+ to Fe 2+ The disadvantages of low conversion rate

Method used

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  • Composite material of silver-silver halide supported iron nanometer minerals and preparation method for composite material
  • Composite material of silver-silver halide supported iron nanometer minerals and preparation method for composite material

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preparation example Construction

[0018] A preparation method of a silver-silver halide-loaded iron nano-mineral composite material specifically comprises the following steps:

[0019] S100: first synthesize iron nano-minerals;

[0020] Among the series of iron oxide Fenton catalytic materials that have been studied, iron nano-minerals have the characteristics of wide range in nature, large surface area and many surface active groups. There are many types of iron nano-minerals, such as: ferrihydrite, Shi's minerals, iron hydroxide, iron oxide, goethite, etc., which are abundant in the natural environment and can be selected from nature. In this embodiment, ferrihydrite and schwartzite are preferably used as iron nano-minerals.

[0021] The preparation method of ferrihydrite and Shi's minerals can be synthesized or prepared by using the prior art for ferrihydrite and Shi's minerals. Next, this article will describe in detail the preparation methods of the ferrihydrite and Shi's mineral used in this embodiment...

Embodiment 1

[0050] A preparation method of a silver-silver halide-loaded iron nano-mineral composite material, comprising the following steps:

[0051] 1) Take 16.2g of ferric nitrate nonahydrate reagent and add it to a beaker containing 40mL of ultrapure water, and stir it ultrasonically to dissolve it. Add 2.4 g of sodium hydroxide particles to another beaker containing 50 mL of ultrapure water, and dissolve them by ultrasonic stirring. Use a peristaltic pump to slowly drop the above two solutions into another 250mL beaker to stabilize the final pH at about 7, and continue stirring for 30min. After centrifuging and washing the obtained suspension several times, place it in a freeze dryer to freeze-dry, grind it and pass it through a 200-mesh sieve to obtain the prepared ferrihydrite sample;

[0052] 2) Take by weighing 0.188g (12%) silver nitrate and dissolve it in 20mL ultrapure water, add 1g of the ferrihydrite prepared in step 1 therein, stir for 30min to make the silver ions fully ...

Embodiment 2

[0064] A preparation method of a silver-silver halide-loaded iron nano-mineral composite material, comprising the following steps:

[0065] 1) Take 16.2g of ferric nitrate nonahydrate reagent and add it to a beaker containing 40mL of ultrapure water, and stir it ultrasonically to dissolve it. Add 2.4 g of sodium hydroxide particles to another beaker containing 50 mL of ultrapure water, and dissolve them by ultrasonic stirring. Use a peristaltic pump to slowly drop the above two solutions into another 250mL beaker to stabilize the final pH at about 8, and continue to stir for 45min. After centrifuging and washing the obtained suspension several times, place it in a freeze dryer to freeze-dry, grind it and pass it through a 220-mesh sieve to obtain the prepared ferrihydrite sample;

[0066] 2) Take by weighing 0.251g (16%) silver nitrate and dissolve it in 20mL ultrapure water, add 1g of ferrihydrite prepared in step 1 therein, stir for 30min to make the silver ions fully dispe...

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Abstract

The invention provides a composite material of silver-silver halide supported iron nanometer minerals, and a preparation method for the composite material of the silver-silver halide supported iron nanometer minerals, and relates to the field of environmental wastewater pollution control. The preparation method comprises the following steps: adding the iron nanometer minerals into a silver nitratesolution to obtain a first mixed solution; adding an alkali metal halide solution for enabling silver nitrate to completely form silver halide precipitates into the first mixed solution, so as to obtain a second mixed solution; adding a hole trapping agent into the second mixed solution, and carrying out a photoreduction reaction on a part of silver halide with ultraviolet light to generate elemental silver, so as to obtain a third mixed solution; and carrying out freeze-drying on the third mixed solution after centrifugally washing repeatedly. The preparation method is low in cost and high in recycling rate, and can lower the wastewater treatment cost. The prepared composite material has the advantages of uniform particle size, less agglomeration, high dispersibility and the like, can effectively remove organic pollutants in water under visible light, and further is high in times of repeated use and low in iron dissolving-out quantity to avoid secondary pollution, thereby being an environmentally-friendly and economical process technology.

Description

technical field [0001] The invention belongs to the field of environmental waste water pollution control, and specifically relates to a silver-silver halide-loaded iron nano-mineral composite material and a preparation method thereof. Background technique [0002] Industrial wastewater has a large amount of discharge, complex components, and strong toxicity. It is difficult to completely degrade it using traditional water treatment and purification technologies, so it cannot meet the discharge standards. In recent years, heterogeneous Fenton catalysis, an advanced oxidation technology, has been widely used in the advanced treatment of biochemically refractory wastewater due to its wide application range, strong oxidation ability, rapid and thorough degradation, and easy separation and recovery. However, the single iron oxide type Fenton catalyst has low specific surface area, low activity, chemical instability and Fe 3+ to Fe 2+ The disadvantage of low conversion rate. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/128B01J37/03B01J37/16B01J37/32C02F1/30C02F101/34
Inventor 朱润良朱雁平陈情泽刘晶朱建喜何宏平
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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