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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantages of small size, low density and difficult separation of biochar limit its further development.

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
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of modified biochar composite chitosan-based adsorbent, comprising the steps of:

[0038] 1) Preparation of modified biochar: Disperse 2 g of natural cotton waste into 50 mL of 7 mol / L KOH solution, sonicate for 30 minutes, and then soak in vacuum for 20 h. Then, the excess KOH solution was filtered and dried for 24 hours to obtain a dry cotton / KOH mixture. The mixture was placed in a horizontal tube furnace and heated at 400°C under nitrogen for 0.5h, then raised to 800°C at a rate of 5°C / min and kept for 1h. After the sample was cooled, it was repeatedly washed with pure water until the pH was neutral, and then dried at 80 °C. Then, the dried sample was dispersed in 50mL 5mol / L HNO 3 solution, after magnetic stirring for 1 h, it was left overnight. Finally, filter out the HNO 3 solution, and the sample was washed with pure water until the pH value was neutral, and the sample obtained after drying was modified biochar.

[0039] 2) Weigh 2.6625...

Embodiment 2

[0042] A preparation method of modified biochar composite chitosan-based adsorbent, comprising the steps of:

[0043] 1) Preparation of modified biochar: Disperse 2 g of natural cotton waste into 50 mL of 7 mol / L KOH solution, sonicate for 30 minutes, and then soak in vacuum for 20 h. Then, the excess KOH solution was filtered and dried for 24 hours to obtain a dry cotton / KOH mixture. The mixture was placed in a horizontal tube furnace and heated at 400°C under nitrogen for 0.5h, then raised to 800°C at a rate of 5°C / min and kept for 1h. After the sample was cooled, it was repeatedly washed with pure water until the pH was neutral, and then dried at 80 °C. Then, the dried sample was dispersed in 50mL 5mol / L HNO 3 solution, after magnetic stirring for 1 h, it was left overnight. Finally, filter out the HNO 3 solution, and the sample was washed with pure water until the pH value was neutral, and the sample obtained after drying was modified biochar.

[0044] 2) Weigh 2.8673...

Embodiment 3

[0047] A preparation method of modified biochar composite chitosan-based adsorbent, comprising the steps of:

[0048] 1) Preparation of modified biochar: Disperse 2 g of natural cotton waste into 50 mL of 7 mol / L KOH solution, sonicate for 30 minutes, and then soak in vacuum for 20 h. Then, the excess KOH solution was filtered and dried for 24 hours to obtain a dry cotton / KOH mixture. The mixture was placed in a horizontal tube furnace and heated at 400°C under nitrogen for 0.5h, then raised to 800°C at a rate of 5°C / min and kept for 1h. After the sample was cooled, it was repeatedly washed with pure water until the pH was neutral, and then dried at 80 °C. Then, the dried sample was dispersed in 50mL 5mol / L HNO3 solution, stirred by magnetic force for 1h, and left overnight. Finally, the HNO3 solution was filtered out, and the sample was washed with pure water until the pH value was neutral, and the sample obtained after drying was modified biochar.

[0049] 2) Weigh 3.0720...

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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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