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Modified bagasse pith lignin, and preparation method and application thereof

A technology of lignin and sugarcane pith, which is applied in the field of heavy metal pollution control in environmental protection, can solve the problem of not improving the adsorption capacity of heavy metals, and achieve the effects of improving the adsorption capacity of heavy metals, good mechanical strength, and simple preparation process

Inactive Publication Date: 2020-07-17
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified alkali lignin in the above method only improves the resistance to Pb 2+ 、Cd 2+ 、Cr 3+ The adsorption capacity of the three metal ions, the adsorption capacity of other types of heavy metals has not improved

Method used

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  • Modified bagasse pith lignin, and preparation method and application thereof
  • Modified bagasse pith lignin, and preparation method and application thereof
  • Modified bagasse pith lignin, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of sugarcane pith lignin is separated from sugarcane pith by alkaline sulfite method, then acidified and precipitated by 20% sulfuric acid, the separated black liquor is collected, and the black liquor is concentrated. Take 1000ml of the concentrated black liquor and add Sodium hydroxide, adjust the pH to 13, filter to remove insoluble matter, adjust the supernatant to pH 2 with sulfuric acid, then let it stand for precipitation, wash with distilled water until neutral, and dry at 70°C to obtain pith lignin. At room temperature, mix 2g pith lignin with 20g water, adjust its pH to 4, add 0.5g sodium periodate to oxidize to obtain oxidized pith lignin, extract, wash until neutral, and dry at 70°C ,spare.

[0039] Take 2g of oxidized cane pith lignin after drying and put it into a three-necked flask equipped with a stirrer and a thermometer, add 45ml of sodium hydroxide with a concentration of 10wt%, 15g of epichlorohydrin, and 10ml of absolute ethanol at 80°...

Embodiment 2

[0042] The preparation of sugarcane pith lignin is separated from sugarcane pith by alkaline sulfite method, then acidified and precipitated by 20% sulfuric acid, the separated black liquor is collected, and the black liquor is concentrated. Take 1000ml of the concentrated black liquor and add Sodium hydroxide, adjust the pH to 13, filter to remove insoluble matter, adjust the supernatant to pH 2 with sulfuric acid, then let it stand for precipitation, wash with distilled water until neutral, and dry at 70°C to obtain pith lignin. At room temperature, mix 2 g of pith lignin with 50 g of water, adjust its pH to 4, add 0.3 g of sodium periodate for oxidation treatment to obtain oxidized pith lignin, extract, wash until neutral, and dry at 70 ° C ,spare.

[0043] Take 2g of oxidized cane pith lignin after drying and put it into a three-necked flask equipped with a stirrer and a thermometer, add 50ml of sodium hydroxide with a concentration of 10wt%, 18g of epichlorohydrin, and 10...

Embodiment 3

[0046] The preparation of sugarcane pith lignin is separated from sugarcane pith by alkaline sulfite method, then acidified and precipitated by 20% sulfuric acid, the separated black liquor is collected, and the black liquor is concentrated. Take 1000ml of the concentrated black liquor and add Sodium hydroxide, adjust the pH to 13, filter to remove insoluble matter, adjust the supernatant to pH 2 with sulfuric acid, then let it stand for precipitation, wash with distilled water until neutral, and dry at 70°C to obtain pith lignin. At room temperature, mix 2 g of pith lignin with 50 g of water, adjust its pH to 4, add 0.5 g of sodium periodate to oxidize to obtain oxidized pith lignin, extract, wash until neutral, and dry at 70 ° C ,spare.

[0047] Take 2g of oxidized cane pith lignin after drying and put it into a three-necked flask equipped with a stirrer and a thermometer, add 50ml of sodium hydroxide with a concentration of 10wt%, 20g of epichlorohydrin, and 10ml of absolut...

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Abstract

The invention discloses modified bagasse pith lignin, and a preparation method and application thereof. The preparation method comprises the following steps: preparing bagasse pith lignin by adoptingan acid precipitation method, adding an oxidant to prepare oxidized bagasse pith lignin, adding sodium hydroxide, epoxy chloropropane and absolute ethyl alcohol to obtain epoxidized bagasse pith lignin, and adding diethylenetriamine, highly-branched polyamine, an alkaline solution and formaldehyde to obtain aminated bagasse pith lignin. The heavy metal adsorption capacity of the modified bagasse pith lignin is greatly improved.

Description

technical field [0001] The invention relates to the technical field of heavy metal pollution control in environmental protection, in particular to a modified sugarcane pith lignin, a preparation method and an application thereof. Background technique [0002] At present, there are many methods for the treatment of heavy metal wastewater, the common ones are chemical method, membrane method, ion exchange method and adsorption method. However, comparing several methods, from the perspective of operating cost and operational stability, although the chemical method and the membrane method are very effective methods, the chemical method has high requirements for some treatment equipment, and the sludge containing heavy metals produced The cost is high, and the cost of equipment maintenance is relatively high. Membrane equipment is relatively expensive, and the operation and maintenance costs are also high, and the processing capacity is very limited. Both ion exchange and adsor...

Claims

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Application Information

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IPC IPC(8): C08H7/00B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24C02F1/286C02F2101/20C08H6/00
Inventor 刘新亮王双飞王加宝刘静覃程荣梁辰聂双喜张健
Owner GUANGXI UNIV
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