Preparation method and application of amphoteric chelate sorbent containing agricultural straw

A technology for chelating adsorbent and straw, which is applied in the field of preparation and application of amphoteric chelating adsorbent for agricultural straw, can solve the problems of secondary pollution, single functional group, low metal ion adsorption capacity, etc., and achieves a simple and good production process. The effect of water treatment effect

Inactive Publication Date: 2010-10-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims at the disadvantages that most of the adsorbents prepared from agricultural straw only have a single functional group, and the problem of secondary pollution caused by lye pretreatment, or

Method used

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  • Preparation method and application of amphoteric chelate sorbent containing agricultural straw
  • Preparation method and application of amphoteric chelate sorbent containing agricultural straw
  • Preparation method and application of amphoteric chelate sorbent containing agricultural straw

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Take wheat straw with a particle size of 500 μm, mix it with 5 milliliters of epichlorohydrin per gram of agricultural straw, and stir in a three-necked bottle. During stirring, add 5 milliliters per gram of agricultural straw, add N,N-dimethylformamide, stirred and reacted at 100°C for 60min;

[0025] (2) Add cross-linking agent ethylenediamine into the three-necked bottle, mix each gram of agricultural straw with 2 ml of cross-linking agent, continue to stir and react for 60 minutes, and the reaction temperature is 100°C;

[0026] (3) Add a solution of grafting reactant triethylamine with a mass percentage concentration of 99%, mix each gram of agricultural straw with 5 ml of grafting reactant, and stir and react at 100° C. for 180 min;

[0027] (4) the solid product that step (3) obtains is washed successively with 0.1mol L -1 NaOH solution, 0.1mol L -1 HCl solution, volume percent concentration of 50% C 2 h 5 Wash with OH and deionized water, dry in vacuum a...

Embodiment 2

[0031] Wheat straw and epichlorohydrin are stirred and reacted, and cross-linking agent ethylenediamine is added, then triethylamine solution is added, and the batching ratio between them is wheat straw: epichlorohydrin: ethylenediamine: triethylamine solution=1g : 2ml: 1ml: 5ml, prepared wheat straw anion adsorbent A; then A is reacted with isopropanol and water stirring, and NaOH is added, then monochloroacetic acid is added, and the batching ratio between them is A: (isopropanol+ Water): NaOH: monochloroacetic acid=1g: (13.45ml+0.67ml): 0.75ml: 0.51g to obtain the wheat straw amphoteric chelate adsorbent.

[0032] The operation steps are the same as in Example 1, except that the added epichlorohydrin is 2ml and ethylenediamine is 1ml.

Embodiment 3

[0034] Wheat straw and epichlorohydrin are stirred and reacted, and cross-linking agent ethylenediamine is added, then triethylamine solution is added, and the batching ratio between them is wheat straw: epichlorohydrin: ethylenediamine: triethylamine solution=1g : 10ml: 10ml: 5ml, prepared wheat straw anion adsorbent A; then A is reacted with isopropanol and water stirring, and NaOH is added, then monochloroacetic acid is added, and the batching ratio between them is A: (isopropanol+ Water): NaOH: monochloroacetic acid=1g: (13.45ml+0.67ml): 0.5ml: 0.51g to obtain the wheat straw amphoteric chelate adsorbent.

[0035] The operation steps are the same as in Example 1, except that the added epichlorohydrin is 10ml, ethylenediamine is 10ml, and the amount of NaOH is 0.5ml.

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Abstract

The invention relates to a preparation method and application of an amphoteric chelate sorbent containing agricultural straw. The sorbent is brownish-yellow solid powder, the nitrogen content is 10.83wt%, and the specific surface area is 12.93m<2>/g. The sorbent is prepared by taking agricultural straw, epoxy chloropropane and monochloroacetic acid as raw materials, taking trimethylamine or triethylamine as a grafting reaction agent and taking ethylenediamine, diethylenetriamine or triethylenetetramine as a cross-linking agent. The method of the invention has the advantages of simple production processes, economy, practicability, reproducibility and the like and can be suitable for large-scale production. The sorbent prepared by the invention has the characteristics of good stability, good adsorption effect, wide application range and the like, can be widely applied to treatment of waste water containing heavy metal ions, and has better treatment effect.

Description

technical field [0001] The invention relates to a method for preparing an adsorbent by deep processing of agricultural straw and its application, in particular to a preparation method and application of an amphoteric chelating adsorbent for agricultural straw. Background technique [0002] According to the statistics of the United Nations Environment Program (UNEP), the straw produced by various crops grown in the world is as many as 1.7 billion tons every year, and its utilization can be roughly divided into three categories: one is industrial raw materials, which are mainly used for papermaking, accounting for about 1.7 billion tons of straw. The second is livestock feed, which is mainly used as herbivore feed, accounting for about 24.0% of the total; the third is direct combustion or as biomass energy, accounting for 31.5%, and the rest is wasted or burned on site. [0003] Heavy metal ion wastewater mainly comes from electroplating, mining, smelting, chemical industry an...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30B01J20/28C02F1/28C02F101/20
Inventor 岳钦艳钟倩倩李倩许醒高宝玉
Owner SHANDONG UNIV
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