Preparation method of modified biomass charcoal composite chitosan-based adsorbent

A biochar and chitosan technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants, etc., can solve the problems of low density, small size of biochar, difficult to separate, etc., and achieve adsorption performance Improve the effect of simple synthesis process and great application prospects

Pending Publication Date: 2021-11-19
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of small size, low density and di

Method used

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  • Preparation method of modified biomass charcoal composite chitosan-based adsorbent
  • Preparation method of modified biomass charcoal composite chitosan-based adsorbent
  • Preparation method of modified biomass charcoal composite chitosan-based adsorbent

Examples

Experimental program
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Example Embodiment

[0036] Example 1

[0037] A modified method for preparing chitosan-based biomass carbon composite adsorbent, comprising the steps of:

[0038] 1) Preparation of modified biomass chars: 2g of natural cotton waste dispersed 7mol / L KOH solution in 50mL, sonicated for 30 minutes, then immersed in vacuo 20h. Then, the excess KOH solution was filtered, dried to obtain a cotton / KOH mixture was dried for 24 hours. The mixture was placed in a horizontal tube furnace, heated at 400 deg.] C under nitrogen for 0.5h, then warmed to 800 deg.] C at a rate of 5 ℃ / min and kept 1h. After the sample was cooled, which was repeatedly washed with pure water until neutral pH, then dried at 80 ℃. Then, the dried sample was dispersed in 50mL 5mol / L HNO 3 Solution, IH After magnetic stirring, allowed to stand overnight. Finally, filter out HNO 3 Solution, and the sample is washed with pure water until neutral the pH, the sample was dried to obtain a modified biomass chars.

[0039] 2) Weigh 2.6625g...

Example Embodiment

[0041]Example 2

[0042] A modified method for preparing chitosan-based biomass carbon composite adsorbent, comprising the steps of:

[0043] 1) Preparation of modified biomass chars: 2g of natural cotton waste dispersed 7mol / L KOH solution in 50mL, sonicated for 30 minutes, then immersed in vacuo 20h. Then, the excess KOH solution was filtered, dried to obtain a cotton / KOH mixture was dried for 24 hours. The mixture was placed in a horizontal tube furnace, heated at 400 deg.] C under nitrogen for 0.5h, then warmed to 800 deg.] C at a rate of 5 ℃ / min and kept 1h. After the sample was cooled, which was repeatedly washed with pure water until neutral pH, then dried at 80 ℃. Then, the dried sample was dispersed in 50mL 5mol / L HNO 3 Solution, IH After magnetic stirring, allowed to stand overnight. Finally, filter out HNO 3 Solution, and the sample is washed with pure water until neutral the pH, the sample was dried to obtain a modified biomass chars.

[0044] 2) Weigh 2.8673g ...

Example Embodiment

[0046] Example 3

[0047] A modified method for preparing chitosan-based biomass carbon composite adsorbent, comprising the steps of:

[0048] 1) Preparation of modified biomass chars: 2g of natural cotton waste dispersed 7mol / L KOH solution in 50mL, sonicated for 30 minutes, then immersed in vacuo 20h. Then, the excess KOH solution was filtered, dried to obtain a cotton / KOH mixture was dried for 24 hours. The mixture was placed in a horizontal tube furnace, heated at 400 deg.] C under nitrogen for 0.5h, then warmed to 800 deg.] C at a rate of 5 ℃ / min and kept 1h. After the sample was cooled, which was repeatedly washed with pure water until neutral pH, then dried at 80 ℃. Then, the dried sample was dispersed in 50mL 5mol / L HNO3 solution, IH magnetic stirring, overnight. Finally, HNO3 solution was filtered off, and until a neutral pH sample was washed with pure water, dried sample was obtained a modified biomass chars.

[0049] 2) Weigh 3.0720g of KOH was dissolved in 5mL ...

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Abstract

The invention belongs to the technical field of composite materials, and relates to a preparation method of a modified biomass charcoal composite chitosan-based adsorbent, which comprises the following steps: weighing potassium hydroxide, dissolving in deionized water, placing in an ice bath, dropwise adding acrylic acid for neutralization, adding modified biomass charcoal when the neutralization degree reaches 60-80%, and ultrasonically stirring uniformly to obtain a solution A; ultrasonically dissolving chitosan and disodium ethylene diamine tetraacetate in deionized water, and obtaining a solution B; uniformly mixing potassium persulfate and N'N-methylene bisacrylamide according to a volume ratio of 1: 1 to obtain a solution C, adding potassium persulfate serving as an initiator and N'N-methylene bisacrylamide serving as a cross-linking agent, carrying out ultrasonic treatment for 1 hour, reacting at 70 DEG C for 2 hours to obtain a hydrogel crude sample, soaking and washing with absolute ethyl alcohol for multiple times, carrying out vacuum drying at 70 DEG C for 24 hours, grinding into powder, drying and storing. The prepared adsorbent can be applied to adsorption of pollutants in water. The raw materials are low in cost and easy to obtain, the synthesis process is simple, the adsorption performance of the hydrogel is improved, waste is turned into wealth, and the product has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and relates to an adsorbent, in particular to a preparation method of a modified biomass charcoal composite chitosan-based adsorbent. Background technique [0002] Chitosan (chitosan, CS) is a natural polysaccharide chitin deacetylated product, because of its wide range of sources, high biocompatibility, non-toxic and degradable advantages. In addition, the molecular structure of CS contains abundant hydroxyl and amino functional groups, which will react in acidic solution (H + Exist in large quantities) are protonated to generate positively charged -NH 3 + and -OH 2 + , has good adsorption properties for heavy metal ions and dyes. Chitosan is also widely used in textile industry, food industry, beauty industry, medical fiber, medical dressing, artificial tissue material, drug sustained release material, gene transduction carrier, biomedical field, medical absorbable material, ti...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/265B01J20/28047B01J20/3078B01J20/3085B01J20/3071B01J20/3021C02F1/288B01J2220/4825C02F2101/20C02F2101/308
Inventor 樊祥博王晓红蔡耀涛谢弘灏郝臣
Owner JIANGSU UNIV
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