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Preparation method and application of hydroxypropyl guar gum/nanocellulose cross-linked adsorption film

A technology of hydroxypropyl guar gum and nanocellulose, applied in chemical instruments and methods, adsorption water/sewage treatment, membrane technology, etc. Limitation and other issues, to achieve good adsorption / desorption performance, low toxicity, high mechanical properties

Active Publication Date: 2018-08-31
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is worth noting that the composite membrane formed by the hydrogen bonding between -OH has low mechanical strength, is easy to disintegrate and disperse in aqueous media, and has weak pollutant adsorption capacity, which makes the hybrid membrane Applications are very limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0028] Embodiment 1: The preparation method of this hydroxypropyl guar gum / nanometer cellulose cross-linked adsorption film, concrete operation is as follows:

[0029] (1) Preparation process of nanocellulose

[0030] Weigh 5.6g of air-dried microcrystalline cellulose (if the dryness of microcrystalline cellulose is 90%, 5g of dry material / 90%=5.6g of air-dried material), transfer to a glass beaker and add 1000mL of deionized water to adjust the concentration 0.5%, pour it into the nano-grinding machine, adjust the rotation speed of the grinding disc to 1000rpm, and the distance between the grinding discs to -10μm, and circulate the grinding 10 times. After the treatment, collect the sample and continue the ultrasonic treatment in the ice-water bath. Set the ultrasonic power to 100w. Ultrasonic waves are intermittent for 1 minute every 1 minute, and the total action time is 10 minutes. The processed sample is centrifuged at 5000 rpm for 10 minutes, the upper layer liquid is co...

Embodiment 2

[0039] Embodiment 2: the preparation method of this hydroxypropyl guar gum / nanocellulose cross-linked adsorption film, concrete operation is as follows:

[0040] (1) Preparation process of nanocellulose

[0041] Weigh 8.7g air-dried microcrystalline cellulose (if the dryness of microcrystalline cellulose is 92%, 8g absolute dry material / 92%=8.7g air-dried material), transfer to a glass beaker and add 266mL deionized water to adjust the concentration 3.0%, pour it into the nano-grinder, adjust the rotation speed of the grinding disc to 2000rpm, the distance between the grinding discs to -60μm, and cycle grinding for 40 times. After the treatment, collect the sample and continue the ultrasonic treatment in the ice-water bath. Set the ultrasonic power to 900w. Ultrasound is applied for 3 minutes and intermittent for 3 minutes, and the total action time is 30 minutes. The treated samples are centrifuged at 8000 rpm for 20 minutes, the upper layer liquid is collected, and freeze-dr...

Embodiment 3

[0050] Embodiment 3: the preparation method of this hydroxypropyl guar gum / nanometer cellulose cross-linked adsorption film, concrete operation is as follows:

[0051] (1) Preparation process of nanocellulose

[0052] Weigh 21.1g air-dried microcrystalline cellulose (if the dryness of microcrystalline cellulose is 95%, 20g absolute dry material / 95%=21.1g air-dried material), transfer to a glass beaker and add 400mL deionized water to adjust the concentration 5.0%, pour it into the nano-grinder, adjust the rotation speed of the grinding disc to 3000rpm, the distance between the grinding discs to -80μm, and cycle grinding 60 times. After the treatment is completed, collect the sample and continue the ultrasonic treatment in the ice-water bath. Set the ultrasonic power to 1200w. Ultrasound is applied every 5 minutes and intermittently for 5 minutes, and the total action time is 60 minutes. The treated samples are centrifuged at 10,000 rpm for 30 minutes, the upper liquid is colle...

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Abstract

The invention discloses s preparation method of a hydroxypropyl guar gum / nanocellulose cross-linked adsorption film. The method takes hydroxypropyl guar gum and microcrystalline cellulose as main raw materials, and comprises the steps: thinning the microcrystalline cellulose in a nano grinder and a high-strength ultrasonic wave generator successively to prepare nanocellulose, then respectively dispersing and dissolving the nanocellulose and hydroxypropyl guar gum in maleic acid, then adding maleic anhydride and sodium hypophosphite, stepwise heating to carry out esterification and cross-linking reaction, centrifuging and defoaming the reactant, shaping the reactant in a mold, forming a film by drying, and cleaning and freeze-drying the film to obtain the adsorption film. The film prepared by the method is light yellow and transparent, has good adsorptive capacity on copper ions, zinc ions, led ions, methylene blue and methyl violet, and simultaneously has higher mechanical properties.

Description

technical field [0001] The invention relates to a process technology of a natural polymer adsorption film capable of comprehensively treating heavy metal ions and organic dye waste liquid, especially a preparation method and application of a hydroxypropyl guar gum / nanocellulose cross-linked adsorption film, which belongs to The technical field of natural polymer modified materials. Background technique [0002] With the rapid development of industrialization, the waste water discharged by many factories containing a large amount of pollutants such as heavy metals and organic dyes has increased sharply, and has caused serious pollution to the receiving environment. Generally, heavy metals are those that pose pollution and toxicity problems, such as lead, chromium, copper, zinc, nickel, mercury, etc. [1] . Unlike most organic pollutants, heavy metals exist in both rocks and ores; under natural conditions, their concentrations in soil, sediment, water and living organisms sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30B01D71/10B01D67/00C02F1/28C02F1/44C02F101/20C02F101/30
CPCB01D67/0006B01D71/10B01J20/24B01J20/28033C02F1/286C02F1/44C02F2101/20C02F2101/308
Inventor 高欣张恒陈克利何洁
Owner KUNMING UNIV OF SCI & TECH
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