Beta cyclodextrin and magnetic oxidized graphene composite and preparation method and applications thereof

A technology of β-cyclodextrin and rock oxide, which is applied in the direction of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problems of limiting the application of adsorbents, and achieve many surface adsorption sites, High adsorption efficiency and high removal efficiency

Inactive Publication Date: 2013-10-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its solubility in water limits its application as an adsorbent in wastewater treatment.

Method used

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  • Beta cyclodextrin and magnetic oxidized graphene composite and preparation method and applications thereof
  • Beta cyclodextrin and magnetic oxidized graphene composite and preparation method and applications thereof
  • Beta cyclodextrin and magnetic oxidized graphene composite and preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A kind of β cyclodextrin of the present invention and magnetic graphene oxide compound, this compound is prepared by the following method:

[0024] (1) Mix 3.0g graphite, 2.5gK 2 S 2 o 8 , 2.5gP 2 o 5 and 1~20mLH 2 SO 4 After mixing, heat to 60~100°C in a water bath, add 0.5L ultrapure water after 4 hours of reaction, let stand for 12 hours after cooling, wash with ultrapure water to remove residual acid, dry in vacuum at 60°C, add the dried product to 120mL temperature H at 0°C 2 SO 4 (98%), add 2.5gNaNO 3 , 15g KMnO 4 , and shake at 20°C for 4h, then react at 35°C for 2h, then add 250mL of water to ensure that the reaction temperature is controlled at 90°C, continue to shake for 1h, then add 0.5L of water and 20mL of H 2 o 2 (30%), shake at room temperature for 2h, then wash repeatedly with HCl (10%) and water, then ultrasonicate at 50°C for 2h, and obtain graphene oxide with a concentration of 5.2g / L after constant volume;

[0025] (2) At room temperature...

Embodiment 2

[0030] Applying the β-cyclodextrin and magnetic graphene oxide composite prepared in Example 1 to the treatment of hexavalent chromium ion wastewater includes the following steps: taking three hexavalent chromium solutions with initial concentrations of 10, 20 and 40 mg / L respectively , adjust the pH value of the solution to 3.0, add the β-cyclodextrin and magnetic graphene oxide composite prepared in Example 1, the dosage of the composite is 0.17g / L, and carry out oscillation adsorption at 30°C with an air bath constant temperature oscillator Reaction, the rotation speed is 180rpm, after 24 hours, the complex is separated from the waste water with a magnet, and the content of unadsorbed hexavalent chromium in the waste water is measured by ultraviolet spectrophotometry. The calculated adsorption results are shown in Table 1.

[0031] Table 1: Adsorption data of chromium by β-cyclodextrin and magnetic graphene oxide composites under different initial concentrations of chromium ...

Embodiment 3

[0035] The β cyclodextrin prepared in Example 1 and the magnetic graphene oxide compound are applied to the treatment of hexavalent chromium ion wastewater, comprising the following steps: taking a hexavalent chromium solution with an initial concentration of 10 mg / L, and adjusting the pH value of the solution to 3.0, add the β-cyclodextrin and magnetic graphene oxide composite prepared in Example 1, the consumption of the composite is 0.17g / L, and the adsorption reaction is carried out in an air bath constant temperature oscillator at 10, 30 and 50°C respectively, The rotation speed was 180rpm. After 24 hours, the complex was separated from the waste water with a magnet, and the content of unadsorbed hexavalent chromium in the waste water was measured by ultraviolet spectrophotometry. The calculated adsorption results are shown in Table 2.

[0036] Table 2: Adsorption data of chromium by β-cyclodextrin and magnetic graphene oxide composites under different temperature conditio...

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Abstract

The invention discloses a method for removing the hexavalent chromium in waste water by using beta cyclodextrin and magnetic oxidized graphene composite. The method comprises the steps of: adding the composite into hexavalent chromium waste water with the concentration of 5-100g / L, wherein the usage amount of the composite is 0.1-1g / L; regulating the pH to be 3-8, conducting oscillation adsorption reaction for 1-49h at 10-50 DEG C, and then separating the composite from the waste water through a magnet. The beta cyclodextrin and magnetic oxidized graphene composite and the preparation method and applications thereof have the advantages of low cost, simple technique, high adsorptive property, easiness in separation, environmental protection and the like.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and specifically relates to a composite of β-cyclodextrin and magnetic graphene oxide and its preparation method and application. Background technique [0002] With the rapid development of industry, a large amount of wastewater containing heavy metal pollutants is discharged into water bodies. These pollutants are usually highly toxic and cannot be degraded. They can directly or indirectly enter the human body through the food chain, accumulate and concentrate in the human body, causing teratogenicity and carcinogenicity. , mutagenic hazards. As a toxic heavy metal, chromium is highly toxic and bioaccumulative, and it can cause serious health problems even at very low concentrations. Normally, chromium exists in two stable states of trivalent chromium and hexavalent chromium in wastewater. Among them, hexavalent chromium is far more mutagen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F1/48
Inventor 王慧刘云国胡新将曾光明李婷婷李华英
Owner HUNAN UNIV
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