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Preparation method of esterified vegetable sponge and application thereof in organic matter absorption

A technology of esterifying silk and loofah, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of high regeneration cost of activated carbon, large loss of matrix, exhaustion of activated carbon, etc., and achieve good physical Chemical stability and thermal performance, excellent performance, and improved effect of esterification

Inactive Publication Date: 2010-03-10
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the adsorption of activated carbon is still one of the effective methods to concentrate organic pollutants and reduce the concentration from drains, but the regeneration cost of activated carbon is high and the matrix loss is considerable
In addition, activated carbon can be consumed prematurely if insolubles and ions compete for adsorption sites on the carbon.

Method used

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  • Preparation method of esterified vegetable sponge and application thereof in organic matter absorption
  • Preparation method of esterified vegetable sponge and application thereof in organic matter absorption
  • Preparation method of esterified vegetable sponge and application thereof in organic matter absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Alkali pretreatment: crush the natural loofah with a pulverizer and sieve, mix 30-80 mesh loofah with an appropriate amount of NaOH ethanol solution with a concentration of 30% by weight, alkalinize at room temperature for 24 hours, and then microwave intermittently at 700W Irradiate for 15 minutes; then transfer to a three-necked flask, reflux in a 70°C constant temperature water bath for 3h, wash with deionized water until neutral, and dry at 70°C;

[0044] Preparation of esterified loofah: immerse the loofah after alkali pretreatment in acetic anhydride for 24 hours, then irradiate intermittently under 700W microwave conditions for 1min, 3min, 5min, 10min, 15min and 20min, and wash with deionized water until neutral Finally, dry at 70°C to obtain loofah powders with different esterification rates. The relationship between esterification rate and microwave radiation time is shown in the appendix figure 2 .

Embodiment 2

[0046] Alkali pretreatment: crush the natural loofah with a pulverizer and sieve, mix 30-80 mesh loofah with an appropriate amount of 30% NaOH / ethanol solution, soak for 24 hours, then take out the loofah, Spread it on a surface dish, irradiate intermittently under 700W microwave conditions for 1min, then extract it to neutral with deionized water, and dry it at 70°C to obtain alkali-treated loofah;

[0047] Preparation of esterified loofah: immerse the alkali-pretreated loofah in acetic anhydride for 24 hours, then take out the loofah, spread it on a watch glass, irradiate intermittently under 700W microwave conditions for 1min, and then extract it to medium with deionized water. After drying, dry at 70°C to obtain esterified loofah.

Embodiment 3

[0049] UV-Vis spectrophotometer was used to determine the adsorption capacity of esterified loofah on nitrobenzene.

[0050] (1) First measure the absorbance-concentration standard working curve of the nitrobenzene aqueous solution with an ultraviolet-visible spectrophotometer, and fit the equation to obtain the relationship between the absorbance and the concentration;

[0051] (2) Get 8 20mL test tubes, add 0.016g of different esterified loofahs respectively, then add 15mL of known nitrobenzene aqueous solution in each test tube, track the absorbance with the change of adsorption time with a UV-Vis spectrophotometer, And calculate the unit adsorption capacity Q of loofah at a certain moment according to the standard working curve equation A :

[0052] Q A = ρ A V A ( A ...

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Abstract

The invention discloses a preparation method of esterified vegetable sponge and the application thereof in organic matter, particularly in organic matter absorption in water system, belonging to the technical fields of natural high molecular material modification and wastewater treatment. The method comprises the following steps of: dipping natural vegetable sponge with proper NaOH / ethanol solution; basifying by means of microwave intermittent radiation; reflowing, washing and drying in thermostatic waterbath; and dipping with acetic oxide; intermittently reacting under the condition of microwave radiation, washing and drying to obtain the esterified vegetable sponge. The esterified vegetable sponge has relative simple process technology, has the better performance of organic pollutant absorption than that of the natural vegetable sponge, can partially replace synthetic high molecular material in wastewater treatment, and has the characteristics of wide source, low cost, biological degradation, environmental protection and the like.

Description

technical field [0001] The invention relates to a preparation method of esterified loofah and its application as an adsorbent in the adsorption of organic matter, especially organic matter in a water system, and belongs to the technical field of natural polymer material modification or water treatment. The loofah used in the experiment has rich sources, large modification space, and no side effects on the environment. It can partially replace synthetic polymer materials in sewage treatment, and has a good development prospect. Background technique [0002] Resource shortage and environmental pollution have become two major problems in today's world. It is imminent to develop environmentally friendly products and technologies using natural renewable resources. As the most abundant renewable resource on earth, cellulose has the characteristics of wide sources, low price, biodegradability and environmental friendliness. [0003] In recent years, my country's water pollution ac...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 刘引烽杨红冒海燕陆强冉明浩
Owner SHANGHAI UNIV
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