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Method for rapidly removing trace nano-material in water

A nano-material and water removal technology, applied in the field of environmental chemistry, can solve problems such as no research reports, and achieve high-efficiency enrichment, good stability, and large volume

Inactive Publication Date: 2020-01-07
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, to the best of our knowledge, no rapid removal of nanomaterials based on membrane filtration has been reported
There is no research report on the application of microporous membranes to remove nanomaterials

Method used

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  • Method for rapidly removing trace nano-material in water
  • Method for rapidly removing trace nano-material in water
  • Method for rapidly removing trace nano-material in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The standard addition removal of nano-silver in the actual water of embodiment 1

[0031] The microporous membrane removes nano-silver in four kinds of actual water samples, and the actual water samples do not need any pretreatment. Add nano-silver to 1.0L sewage treatment plant inlet water and outlet water, river water and lake water to 1mg / L, and then add 0.1g of PVDF microporous membrane with a pore size of 0.45μm to the actual water sample containing nano-silver , shake at 300rpm at room temperature for 1h, complete the adsorption, and take out the filter membrane.

[0032] The concentration of nano-silver in the actual water sample after adsorption is measured and the filter membrane after adsorption is characterized: take 1mL of the above-mentioned actual water sample after adsorption by the microporous filter membrane, add 2.0mL concentration of 5% ( v / v) HNO 3 After the aqueous solution, the concentration of silver in the above water sample solution was measur...

Embodiment 2

[0033] Embodiment 2 adopts microporous membrane filtration mode to remove nanoparticles in water

[0034] The PVDF microporous filter membrane with a pore size of 0.45 μm is installed in the replaceable membrane filter head, and the construction is as follows: figure 2 device shown. After sucking 1L of samples (respectively, four kinds of actual water solutions containing 10μg / L nano-silver, river water, lake water, sewage treatment plant inlet water and outlet water) into the syringe, they were all pushed out of the syringe at a speed of 60mL / min. The content of nanomaterials in aqueous solution after microporous membrane filtration.

[0035] The experimental results show that when the concentration of nano-silver in the actual water body is 10 μg / L, the removal efficiency of nano-silver in four kinds of actual water solutions is all above 92%. Considering that the sample matrix is ​​complex and the standard addition level ( Nano silver content) is extremely low, so this r...

Embodiment 3

[0037] a. Add 0.1g of polyvinylidene fluoride (PVDF), polyethersulfone (PES), nylon (Nylon) and mixed cellulose (MCE) microporous membranes with a pore size of 0.45 μm to 1L containing 30mg / L nano silver In the aqueous solution, the pH of the aqueous solution is 4, 5, 6, 7, 8, 9 respectively, 300rpm oscillating adsorption at room temperature for 120min, the adsorption removes the nano-silver in the aqueous solution, and the adsorption ends, and the content of the nano-silver in the aqueous solution is tested after the adsorption is completed. .

[0038] b. Add 0.1g of polyvinylidene fluoride (PVDF), polyethersulfone (PES), nylon (Nylon) and mixed cellulose (MCE) microporous membranes with a pore size of 0.45 μm to 1L containing 50mg / L nano-gold In the aqueous solution, the pH of the aqueous solution is 4, 5, 6, 7, 8, 9 respectively, 300rpm vibration adsorption at room temperature for 120min, the adsorption removes the nano-gold in the aqueous solution, the adsorption is comple...

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Abstract

The invention discloses a method for rapidly removing a nano-material in water. The method comprises the steps: adding a microporous filter membrane into a nano-material aqueous solution with the concentration of more than or equal to 1 [mu]g / L, oscillating and adsorbing for 10-300 min at room temperature, and removing a nano-material in the aqueous solution, wherein the ratio of the mass of the microporous filter membrane to the volume of the aqueous solution is 0.025 g:(0.1-2) L; or, allowing the nano-material aqueous solution with the concentration larger than or equal to 1 [mu]g / L to passthrough the microfiltration membrane at the flow speed smaller than or equal to 60 mL / min, and filtering to remove the nano-material in the aqueous solution, wherein the pore diameter of the microfiltration membrane is 0.22-1 [mu]m. The removal process is controlled by an injection pump, so that the nano-material with the concentration as low as 1 [mu]g / L can be quickly removed. The method is simple to operate, can realize semi-automatic and speed-controllable filtering removal through an injection pump, is suitable for large-size samples and high in removal efficiency, and can be used for simultaneously removing various nano-materials.

Description

technical field [0001] The invention belongs to the field of environmental chemistry, and in particular relates to a method for rapidly removing trace nanometer materials in water. Background technique [0002] Nanomaterials have been widely used in water treatment materials due to their excellent physical and chemical properties. In recent years, studies have found that these water treatment materials containing nanomaterials will inevitably be released into the water environment during production, use and treatment, causing secondary pollution, and potentially causing serious damage to human health, living environment and social safety. harm. Studies have shown that nanomaterials are genotoxic and cytotoxic, and can accumulate in organisms and amplify in the food chain (YJ Kim, SL Yang, JCRyu, Mol. Cell. Toxicol. 2010, 6, 119-125). Therefore, how to effectively control / remove the pollution of nanomaterials in water has become a hot spot in the field of environmental rese...

Claims

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Application Information

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IPC IPC(8): C02F1/44C02F1/28G01N21/71
CPCC02F1/28C02F1/44G01N21/71
Inventor 周小霞闫兵
Owner GUANGZHOU UNIVERSITY
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