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Preparation method of absorbing-enriching material for persistent organic pollutants

A technology for organic pollutants and persistence, applied in water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve problems such as poor interception capacity, achieve short adsorption time, good adsorption performance, and simple preparation process Effect

Inactive Publication Date: 2012-07-25
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main disadvantage of using such highly cross-linked sorbents is the poor retention due to hydrophobicity during the extraction of polar compounds

Method used

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  • Preparation method of absorbing-enriching material for persistent organic pollutants
  • Preparation method of absorbing-enriching material for persistent organic pollutants

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: material preparation method

[0021] Soluble magnesium nitrate is selected as the skeleton material. Magnesium nitrate plus deionized water was prepared into a solution with a concentration of 0.2 M, sodium silicate plus deionized water was prepared into a solution with a concentration of 0.3 M, and antistatic agent SN was prepared into a solution with a concentration of 0.2 M. Add the antistatic SN solution to the magnesium nitrate solution according to the molar ratio of magnesium nitrate: sodium silicate: SN=1:1.5:1, mix well and then add sodium silicate solution, and the obtained precipitate is washed by centrifugation and then dried for use.

Embodiment 2

[0022] Example 2: Adsorption of persistent organic pollutants

[0023] Add 0.01% SN-magnesium silicate adsorption material to the solutions of naphthalene, anthracene, pyrene and fluorene containing 50 μg / L respectively, mix well, transfer the mixed solution, add cyclohexane liquid-liquid extraction after centrifugation, concentrate and use GC / MS measurement, the measurement data are shown in Table 1. In the case of 0.01% adsorption material addition, the removal rate of persistent organic pollutants can reach 20-100%, and the distribution coefficient in SN-magnesium silicate material is greater than the octanol-water distribution of persistent organic pollutants themselves Coefficient (Log K o / w ), indicating that SN has a good adsorption effect on non-polar persistent organic pollutants. And as the octanol-water partition coefficient of the compound itself increases (i.e. Log K o / w increase) the partition coefficient in the adsorbent material increases.

[0024] Table 1...

Embodiment 3

[0026] Example 3: Adsorption of Polar Organic Compounds

[0027] Prepare a series of 10 mL 10 ~ 140 × 10 -3 mM Acid Green 25 (C.I.61570), Acid Blue 7 (C.I.42080) and Reactive Red 2 (C.I.18200) standard solutions, add 0.01% SN-magnesium silicate adsorption material respectively, mix well and then centrifuge to determine the supernatant Liquid dye concentration. The data results are shown in Table 2. Experiments show that in the case of a small amount of addition, SN-magnesium silicate adsorption material shows better adsorption capacity than other adsorption materials, and the saturated adsorption capacity is between 290-560 mg / g. This shows that the SN-magnesium silicate material is beneficial to the adsorption of polar compounds in persistent organic pollutants.

[0028] Table 2. Adsorption of weakly acidic green GS by SN-magnesium silicate material and comparison with other adsorbents

[0029]

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Abstract

The invention relates to a preparation method of absorbing-enriching material for persistent organic pollutants. The absorbing-enriching material is white in appearance, takes magnesium silicate material as a framework, and is formed by hybridization through an antistatic agent SN (dimethy octadecyl hydroxyethyl ammonium nitrate). The preparation method comprises the steps of mixing the antistatic agent SN and magnesium salt (magnesium nitrate, magnesium chloride and the like) uniformly, then conducting the synthesis reaction on the mixture and silicic acid or silicate in water solution, then settling, separating, crushing and sieving to obtain SN-magnesium silicate absorbing-enriching material. The material has the advantages of wide raw material resources, simple preparation method, good absorbing and enriching effect and short contact time, and can be applied to the absorption and enrichment of trace amount of persistent organic pollutants in environmental water.

Description

technical field [0001] The invention relates to a preparation method of an adsorption and enrichment material for persistent organic pollutants (POPs), and belongs to the technical field of environmental pollution detection and control. Background technique [0002] Drinking water is one of the most common substances that people come into contact with in daily life. In recent years, the pollution of persistent organic pollutants caused by human activities to the water environment has become increasingly serious. Due to long-term exposure, persistent organic pollutants in water It has environmental persistence, bioaccumulation, long-distance migration and high toxicity, even in extremely low concentrations, it will cause serious harm to human health, so it has become a hot spot of widespread concern in the scientific community and governments of various countries. [0003] Persistent organic pollutants in the water environment have the characteristics of multi-component and l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30C02F1/28C02F101/30
Inventor 刘颖魏艳平赵建夫
Owner TONGJI UNIV
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