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Preparation method and application of bentonite composite material for adsorbing and degrading site odor substances

A composite material, adsorption and degradation technology, applied in the field of in-situ chemical remediation of organically polluted sites, can solve the problems of few types of commercially available products, short odor diffusion control time, high price, and achieve stable product properties, easy operation and mild reaction. Effect

Active Publication Date: 2021-02-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research and development of odor control materials mainly focus on broad-spectrum deodorants, plant extract deodorants, biodegradable bacteria agents, foam odor inhibitors, etc., but most of them are in the laboratory research stage, and there are fewer types of commercially available products and lower prices. High, odor diffusion control time is short

Method used

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  • Preparation method and application of bentonite composite material for adsorbing and degrading site odor substances
  • Preparation method and application of bentonite composite material for adsorbing and degrading site odor substances
  • Preparation method and application of bentonite composite material for adsorbing and degrading site odor substances

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Experimental program
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Effect test

Embodiment 1

[0028]Preparation of bentonite composite material: raw materials (mass parts) mainly include bentonite (100), cetyltrimethylammonium chloride (5), chitosan (1), calcium chloride (50), hydrogen peroxide (200), cetyltrimethylammonium bromide (0.02), ammonia water (accounting for 5% of the volume fraction of the reaction system). Dissolve 5g of cetyltrimethylammonium chloride in 500mL of distilled water and mix evenly, add 100g of sodium bentonite, and stir at a high speed in a water bath at 60°C until it becomes emulsion; add 1% acetic acid solution containing 1g of chitosan, and ultrasonically After 60 minutes, the product was washed three times with ethanol solution and distilled water; after drying at 102°C, it was ground through a 200-mesh sieve to obtain organically modified bentonite; take 500 mL of cetyltrimethylammonium bromide (0.02 g) aqueous solution , add 50g calcium chloride, ultrasonic 90min, add organic modified bentonite, ultrasonic 120min to obtain mixed solutio...

Embodiment 2

[0033] Verification of the barrier performance of bentonite composite materials for soil odor substances: the preparation method of bentonite composite materials is the same as in Example 1, and the experimental device is shown in Figure 4 . The inner diameter of the experimental device: length 30cm×width 30cm×height 20cm, filled with soil mixed with odorous substances (height 10cm, about 15kg soil, odorous substance release surface 0.09m 2 ), respectively fill in methyl mercaptan (200mg / kg), xylene (200mg / kg), trichlorethylene (200mg / kg) contaminated soil, set the soil moisture content to 25%, and evenly spray 18g of bentonite on the surface of the contaminated soil Composite material (200g / m 2 ). To avoid loss of odorous substances, the experimental setup was sealed with adhesive tape. Turn on the nitrogen gas bottle, pass clean nitrogen gas from one end of the device at a certain gas flow rate, and use a pollutant recovery bottle filled with n-hexane solution (1L) to ab...

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Abstract

The invention discloses a preparation method and application of a bentonite composite material for adsorbing and degrading site odorous substances. Bentonite is subjected to intercalation modificationby adopting an organic modifier and chitosan, after modified bentonite is obtained, an in-situ reaction process is utilized, calcium chloride and hydrogen peroxide are used as preparation raw materials, nano-micron calcium peroxide particles are generated in situ between layered structures of the bentonite under an alkaline condition under the promotion action of a cationic surfactant, and finally the modified bentonite loaded calcium peroxide composite material is prepared. The bentonite composite material has larger interlayer spacing and specific surface area, the loaded micro-nano calciumperoxide can continuously release hydrogen peroxide within a long time while efficient adsorption of the odorous substances is ensured, oxidative degradation of the odorous substances is realized, continuous supply of adsorption points is ensured, The bentonite composite material can be used for adsorption and degradation of the soil odorous substances on a non-disturbance interface of a pesticide industry site and atmospheric emission control.

Description

technical field [0001] The invention belongs to the technical field of in-situ chemical remediation of organic polluted sites, and in particular relates to a preparation method and application of a bentonite composite material for absorbing and degrading site odor substances. Background technique [0002] Pesticide production is a heavily polluting industry. Due to the wide variety of products, all kinds of raw and auxiliary materials, intermediates and finished products used in the production process enter the soil and groundwater and other environmental media through leakage or leakage accidents, causing serious pollution. . With the rapid development of my country's economy, the adjustment of industrial structure and the acceleration of urbanization, in recent years, there have been many industrially polluted sites left over from the relocation of pesticide production enterprises, and there are generally organic pollutants with strong odor, and these pollutants are in sho...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/04B01J20/30B01D53/02
CPCB01J20/12B01J20/041B01D53/02Y02A50/20
Inventor 张猛冯美云林匡飞陈秀荣徐仲均张婷婷史仪白雪
Owner EAST CHINA UNIV OF SCI & TECH
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