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Nano-cus/tio immobilized on corn stover and regenerated cellulose 2 Preparation method and application of composite aerogel

A technology of regenerated cellulose and composite airgel, which is applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, water/sludge/sewage treatment, etc., and can solve problems without high added value Utilization, high recombination rate of photogenerated carriers, low utilization rate of sunlight and other problems, to achieve low cost, improve catalytic efficiency, and improve catalytic activity

Inactive Publication Date: 2021-01-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, titanium dioxide still has the following disadvantages: The band gap is wide (3.2 eV), and the corresponding absorption spectrum is 387 mm. It can only absorb ultraviolet light, has no response in the visible light range, and has a low utilization rate of sunlight (about 4%); The high recombination rate of photogenerated carriers leads to low photocatalytic efficiency, which restricts the wide application of this technology
Corn stalks are one of the three major straw resources in my country. Due to the constraints of their own characteristics and transformation technology, they have not been used with high added value. Now they are mainly used as livestock feed or even incinerated, and there are very few industrial applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: Loading CuS / TiO 2 The preparation method of the regenerated cellulose composite airgel, the specific operations are as follows:

[0036] (1) Preparation process of corn stalks

[0037] The corn stalks are air-dried to control the moisture content to 7%, and the pith cores are taken and cut into sticks with a length of 10 mm and a width of 1 mm for later use;

[0038] (2) Extraction of cellulose

[0039] Adopt hydrogen peroxide and malonic acid mixed solution to carry out extraction cellulose treatment to qualified stalk core, wherein hydrogen peroxide and malonic acid mixed solution are hydrogen peroxide and malonic acid with a mass percent concentration of 30% in a volume ratio of 1: 3, the mass percent concentration of the dry stalk core material in the mixture is 8%, and then treated at 60°C for 48 hours. After the reaction is completed, the material is deionized and washed to neutrality and freeze-dried to obtain corn pith cellulose;

[0040] The spec...

Embodiment 2

[0051] Example 2: Loading CuS / TiO 2 The preparation method of the regenerated cellulose composite airgel, the specific operations are as follows:

[0052] (1) Preparation process of corn stalks

[0053] The corn stalks are air-dried to control the moisture content to 20%, and the pith cores are cut into sticks with a length of 40 mm and a width of 3 mm for later use;

[0054] (2) Extraction of cellulose

[0055] Hydrogen peroxide and malonic acid mixed solution are used to extract cellulose from qualified stalk cores, wherein the mass percent concentration is 35% hydrogen peroxide and malonic acid are mixed in a volume ratio of 3:1 to obtain hydrogen peroxide and malonic acid. Malonic acid mixed solution, the mass percent concentration of dry pith core raw materials in the mixed solution is 15%, and then treated at 100°C for 12 hours, after the reaction is completed, the material is deionized, washed to neutrality and freeze-dried to obtain corn core cellulose;

[0056] Th...

Embodiment 3

[0067] Example 3: Loading CuS / TiO 2 The preparation method of the regenerated cellulose composite airgel, the specific operations are as follows:

[0068] (1) Preparation process of corn stalks

[0069] The corn stalks are air-dried to control the moisture content to 10%, and the pith cores are taken and cut into 20mm in length and 2mm in width for later use;

[0070] (2) Extraction of cellulose

[0071]Using hydrogen peroxide and malonic acid mixed solution to extract cellulose from qualified stalk cores, wherein the mass percentage concentration is 32% hydrogen peroxide and malonic acid are mixed in a volume ratio of 1:1 to prepare hydrogen peroxide and malonic acid. Malonic acid mixed solution, the mass percentage concentration of the dry stalk core raw material in the mixed solution is 10%, and then treated at 80°C for 36 hours, after the reaction is completed, the material is deionized, washed to neutrality and freeze-dried to obtain the stalk core cellulose;

[0072]...

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Abstract

The invention discloses a kind of corn straw regenerated cellulose solid-supported nano-CuS / TiO 2 The preparation method of the composite aerogel is to cut and prepare air-dried corn straw, use the malonic acid / hydrogen peroxide method to extract cellulose from the pith core, and dissolve the freeze-dried cellulose in the DMAc / LiCl system; To TiO 2 Add CuCl dropwise into the suspension 2 and Na 2 S aqueous solution, centrifuge, wash and dry after reaction to obtain CuS / TiO 2 Granular powder; disperse it in DMAc, then add it to the cellulose solution containing glycerol, mix evenly, drop the blended cellulose into the template, regenerate in water, wash and freeze-dry to obtain CuS / TiO 2 Regenerated cellulose composite aerogel; the composite aerogel prepared by the method of the present invention has the advantages of light weight, rich pores, renewable, wide photocatalytic response range, high catalytic degradation efficiency of dye organic matter, and has good performance in the degradation of industrial dye wastewater. application prospects.

Description

technical field [0001] The invention relates to a method of preparing loaded CuS / TiO by using agricultural solid waste --- corn stalks 2 The invention relates to regenerated cellulose airgel of nanoparticles, which is a process technology for catalytically degrading organic dyes, and belongs to the technical field of natural polymer modified materials. Background technique [0002] At present, the problem of industrial dye wastewater is very serious. With the rapid development of China's economy, the discharge of organic wastewater from various industries is increasing year by year. Most of the wastewater is highly toxic. If it is discharged directly without treatment, it will affect the surface and groundwater to varying degrees, resulting in The death of animals and plants even threatens human health. At present, the main organic wastewater treatment methods include biochemical methods, physical adsorption methods and chemical catalytic methods. Because most of the dye m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J31/38B01J35/00C02F1/30C02F101/30
CPCB01J31/06B01J31/38C02F1/30C02F2305/10C02F2101/308B01J35/39B01J35/23
Inventor 谭天高欣唐晓宁
Owner KUNMING UNIV OF SCI & TECH
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