Preparation method of adsorbing material based on natural polysaccharides

An adsorption material, a technology of natural polysaccharides, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve problems such as poor mechanical strength, salt intolerance, etc., to improve mechanical strength, low cost, source of wide effect

Inactive Publication Date: 2016-04-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, hemicellulose rich in xylan and acrylic acid can be grafted and copolymerized to prepare hydrogels with adsorption capacity for heavy metal ions (PengXW, ZhongLX, RenJL, et al. ,60(15):3909-3916.), and magnetic nano Fe 3 o 4 The composite gel obtained by covalent cross-linking of particles has potential application value in the field of drug controlled release and protein separation (ZhaoW, OdeliusK, EdlundU, et al. , but traditional polymer gels have defects such as poor mechanical strength and intolerance to salt

Method used

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  • Preparation method of adsorbing material based on natural polysaccharides
  • Preparation method of adsorbing material based on natural polysaccharides

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 0.10g of hemicellulose in a glass bottle filled with 1mL, 1mol / L NaOH solution in advance, slowly add 0.01g of nano-clay particles, stir for 1h to disperse the nano-clay particles evenly, add 0.15g of PEGDE, and stir again for 15-20min, Then place the glass bottle in a water bath at 50°C, heat for 4 hours, then take out the product and place it in a beaker filled with distilled water for 48 hours, during which the distilled water is replaced regularly to remove unreacted substances, and the hydrogel is freeze-dried to obtain adsorption material, and its SEM photograph as figure 1 As shown in the figure, it can be seen that the prepared adsorbent has a porous structure with a pore size of 100-200 μm, and the surface is covered with negatively charged nano-clay particles, which is conducive to the penetration and adsorption of methylene blue cations. Take 0.10 g of the dried adsorbent material and place it in a methylene blue solution with a pH of 5 and an initia...

Embodiment 2

[0027]Dissolve 0.10g of hemicellulose in a glass bottle filled with 1mL, 1mol / L NaOH solution in advance, slowly add 0.03g of nano-clay particles, stir for 1h to disperse the nano-clay particles evenly, add 0.15g of PEGDE, stir for 15-20min, and then Place the glass bottle in a 60°C water bath, heat for 2 hours, then take out the product and place it in a beaker filled with distilled water for 48 hours, during which the distilled water is replaced regularly to remove unreacted substances, then freeze-dry the hydrogel to obtain adsorption Material. Take 0.10 g of the dried adsorption material and place it in a methylene blue solution with a pH of 5 and a concentration of 50 mg / L for oscillating adsorption at room temperature for 2 h, and the adsorption capacity is 47 mg / g.

Embodiment 3

[0029] Dissolve 0.10g hemicellulose in a glass bottle filled with 1mL, 1mol / L NaOH solution in advance, add 0.15g PEGDE, stir for 15-20min, then place the glass bottle in a water bath at 60°C, heat for 3h, then take out the product and store Place in a beaker filled with distilled water for 48 hours, during which the distilled water is replaced regularly, after removing unreacted substances, the hydrogel is freeze-dried to obtain the adsorption material. Take 0.10 g of the dried adsorbent material and place it in a methylene blue solution with a pH of 5 and a concentration of 50 mg / L for oscillating adsorption at room temperature for 1 h, and the adsorption capacity is 32 mg / g.

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Abstract

The invention relates to a preparation method of an adsorbing material based on natural polysaccharides. According to the method, nano clay particles and hemicellulose polysaccharides separated from agricultural waste cornstalks are used as raw materials and have chemical crosslinking with polyethylene glycol diglycidyl ether under the mild alkaline condition, the adsorbing material adopting a three-dimensional net structure is prepared, and the adsorbing material based on the natural polysaccharides is obtained. Compared with the prior art, the method has the advantages that the material has the efficient adsorbing effect on methylene blue dye ions in water, and the adsorbing capacity can be adjusted through factors such as the adsorbing temperature, pH (potential of hydrogen), initial concentration of dye ions, the usage amount of nano clay and the like. The source of the raw materials adopted by the adsorbing material is wide, the cost is low, the preparation technology is simple and reliable, and the adsorbing material has broad application prospect in the field of dye wastewater treatment.

Description

technical field [0001] The invention belongs to the field of organic dye adsorption materials, in particular to a preparation method of an adsorption material based on natural polysaccharides. Background technique [0002] With the development of industry, organic dyes are more and more widely used in printing and dyeing, textile, papermaking, food and other fields, and the problem of dye wastewater discharge is also becoming more and more serious. According to statistics, in the dyestuff that produces every year, have 2% to be discharged directly in the water body (XuD, HeinS, LooLS, etal. .), due to the carcinogenic and teratogenic effects of organic dyes, the discharge of dye wastewater brings great harm to aquatic organisms and the ecological environment, and further affects other organisms through the food chain. Therefore, how to remove dye ions in water is an environmental protection field. Difficult problems to be solved. At present, the commonly used methods mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28
Inventor 程合丽王启刚
Owner TONGJI UNIV
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