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Method for removing nanoparticles in water body

A nanoparticle, water body technology, applied in the field of water treatment

Inactive Publication Date: 2012-12-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been some studies on the removal of nanoparticles in water by coagulation, but these studies are limited to those traditional coagulants, such as FeCl3, AlCl3 , Al2(SO4)3 and PAC (polyaluminum chloride), the applied research on PFS (polyferric sulfate) has been be ignored

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Preparation of nanoparticle suspension: 30 mg / L nano-titanium dioxide suspension was prepared with tap water, ultrasonically dispersed for 30 min, and the turbidity was measured as 275 NTU after ultrasonic testing.

[0018] Configuration of polymeric ferric sulfate coagulant: commercially available polymeric ferric sulfate powder containing 21.3% iron is configured into a coagulant stock solution with a mass fraction of 8% with deionized water, such as weighing 4g of polymeric ferric sulfate powder to dissolve In 46g deionized water.

[0019] Add 0.3mM polyferric sulfate coagulant stock solution to the ultrasonic suspension, immediately stir rapidly at 650rpm for 1min, then slowly stir at 150rpm for 15min, and let it settle for 30min after stirring. After precipitation, the remaining turbidity was measured to be 58.0 NTU, that is, the removal rate was 78.9%. Further, the supernatant was filtered with a 0.45 μm filter membrane, and the turbidity of the filtrate after fi...

Embodiment 2

[0021] Preparation of nanoparticle suspension: same as Example 1. The turbidity measured after ultrasound was 256 NTU.

[0022] The configuration of polyferric sulfate coagulant: with embodiment 1.

[0023] Add 0.1mM polyferric sulfate coagulant stock solution to the ultrasonic suspension, immediately stir rapidly at 500rpm for 30s, then slowly stir at 100rpm for 10min, and let it settle for 30min after stirring. After precipitation, the remaining turbidity was measured to be 57.3 NTU, that is, the removal rate was 77.6%. Further, the supernatant was filtered with a 0.45 μm filter membrane, and the turbidity of the filtrate after filtration was measured to be 4.61 NTU, that is, the removal rate reached 98.2%.

Embodiment 3

[0024] Example 3: Preparation of nanoparticle suspension: same as Example 1. The turbidity measured after ultrasound was 353 NTU.

[0025] The configuration of polyferric sulfate coagulant: with embodiment 1.

[0026] Add 1mM polyferric sulfate coagulant stock solution to the ultrasonic suspension, immediately stir rapidly at 700rpm for 2min, then slowly stir at 200rpm for 20min, and let it settle for 60min after stirring. After precipitation, the remaining turbidity was measured to be 85.2 NTU, that is, the removal rate was 75.9%. Further, the supernatant was filtered with a filter membrane of 0.45 μm, and the turbidity of the filtrate after filtration was measured to be 6.49 NTU, that is, the removal rate reached 98.2%.

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a method for removing nanoparticles in water body. The method specifically comprises the following step of adding 0.1-1mM (counting as the adding quantity of Fe) of polymeric ferric sulfate coagulant into a nanoparticle suspension liquid for mixing and flocculating, wherein the mixing and flocculating stage comprises (1) a quick stirring stage of 30 seconds-2 minutes at the rotation speed is 500-700rpm, (2) a slow stirring stage of 10-20 minutes at the rotation speed is 100-200rpm and (3) a precipitating stage in which precipitation time is 20min at least. The removal rate of the turbidity is more than 75% after the precipitation, and the removal rate is more than 98% after the water is filtered by a filter film which is less than 1mu m. The method for removing the nanoparticles in the water body has the characteristics that operation is simple and convenient and cost is low, and is very high in removal rate.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for removing nanoparticles in a water body. Background technique [0002] In recent years, the development speed of the nano industry has been significantly accelerated. Nanomaterials are widely used in many fields, including herbicides, cosmetics, printers, electronics, groundwater remediation, sewage and wastewater treatment, etc. However, the potential harm of nanomaterials has gradually attracted people's attention. For example, the biological toxicity of nanoparticles has become a research hotspot in recent years. Considering the biological toxicity of nanoparticles and the potential exposure risk caused by their wide application, relevant researches have been carried out on the aggregation or dispersion characteristics of nanoparticles in water and their removal efficiency in recent years. Therefore, it is necessary to find a traditional meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 王洪涛戚菁王焘李风亭
Owner TONGJI UNIV