Preparation and application for straw cellulose/graphene oxide composite material

A technology of straw cellulose and composite materials, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as uneconomical and time-consuming, and achieve easy operation, preparation cost and energy consumption Low, the effect of reducing the cost of use

Inactive Publication Date: 2019-10-18
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The invention provides a preparation method and application of a straw cellulose / graphene oxide composite material, which is used to solve the time-consuming and uneconomical problems of the current preparation method

Method used

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  • Preparation and application for straw cellulose/graphene oxide composite material
  • Preparation and application for straw cellulose/graphene oxide composite material
  • Preparation and application for straw cellulose/graphene oxide composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1 Preparation of straw cellulose / graphene oxide composite material

[0040] (1) Graphite oxide adopts the modified Hummers method, 0.5 g of graphite oxide is added to 100 mL of deionized water and ultrasonically oscillated for 0.5 h. Then add 0.5mL of straw cellulose, and stir at room temperature for 10 minutes; then add a solution containing NaOH and urea, and continue stirring for 10 minutes to obtain a straw cellulose / graphene oxide mixture;

[0041] (2) Freeze the straw cellulose / graphene oxide mixture for 120 minutes, take it out and stir for 10 minutes, then add NaCl-containing HNO 3 , the centrifuged product was washed several times with deionized water, 50 o C vacuum drying, grinding to obtain straw cellulose / graphene oxide powder product.

[0042] like figure 1 As shown, the prepared straw cellulose / graphene oxide composite material,

[0043] like figure 2 As shown, the prepared straw cellulose material,

[0044] like image 3 As shown, graphen...

Embodiment 2

[0045] Embodiment 2 to heavy metal Cd in water 2+ The removal experiment

[0046] Take 100mL of heavy metal Cd containing 50mg / L 2+ Put the solution in a 250mL Erlenmeyer flask, adjust the pH to 8 with nitric acid or sodium hydroxide, add 100mg of the straw cellulose / graphene oxide composite material prepared in Example 1, shake the solution for 1 hour at room temperature, and then centrifuge the solution . The separated supernatant was analyzed by ICP-MS for the remaining heavy metal Cd in the solution. 2+ The ion concentration was detected, and the detection results were compared with the Cd in the solution before adsorption. 2+ After comparing the initial concentrations of ions, the effect of the straw cellulose / graphene oxide composite on the heavy metal Cd 2+ The adsorption capacity is 49.86mg / g.

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Abstract

The invention relates to a preparation method and an application for a straw cellulose/graphene oxide composite material. The preparation method is to compound straw cellulose/graphene oxide. The application refers to the application in wastewater treatment. The method for the application comprises the following steps: adjusting a pH value of wastewater to 2 to 8, adding the straw cellulose/graphene oxide composite material, carrying out shaking at a room temperature for 30 to 120 min, and centrifuging an obtained solution so as to obtain purified wastewater. The adsorption material provided by the invention has simple preparation method, mild experimental conditions, low cost and energy consumption, good adsorption effect on heavy metal ions, and high wastewater treatment efficiency; andthe composite material has high reutilization efficiency and is free secondary pollution after dissociative adsorption.

Description

technical field [0001] The invention belongs to the technical field of adsorption materials, and in particular relates to the preparation and application of a straw cellulose / graphene oxide composite material. Background technique [0002] Graphene (G), which is a periodic honeycomb two-dimensional carbonaceous new material formed by sp2 hybridized carbon atoms arranged in a hexagon, has a thickness of only 0.335nm. Compared with traditional materials, graphene has many unique advantages, such as a theoretical specific surface area of ​​up to 2630m 2 / g (much higher than conventional activated carbon), high electron mobility of the material itself, good chemical stability, etc. However, there are strong π-π interactions between the graphene material sheets, the surface chemical properties are not active, and the graphene material has poor dispersion performance in aqueous solution and is easy to agglomerate, resulting in a decrease in the specific surface area available in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/24B01J2220/4825C02F1/286C02F2101/20
Inventor 谢敏熊锋培刘小波陈宏丁建韩娟娟吴鑫刘旺
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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