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Starch grafted coal gangue coated nano zero-valent iron composite material and preparation method thereof

A technology of nano-zero-valent iron and starch grafting, which is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc., can solve problems such as cumbersome steps, high cost, and environmental health threats, and achieve treatment Simple method, anti-oxidation, and low-cost effects

Pending Publication Date: 2021-01-26
YULIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The toxicity of hexavalent chromium is far greater than that of trivalent chromium, which poses a huge threat to people's environmental health
However, the method is cumbersome and expensive
In addition, there is no literature report on the application of coal gangue-loaded nano-iron to remove Cr(VI) pollution in water bodies

Method used

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  • Starch grafted coal gangue coated nano zero-valent iron composite material and preparation method thereof
  • Starch grafted coal gangue coated nano zero-valent iron composite material and preparation method thereof
  • Starch grafted coal gangue coated nano zero-valent iron composite material and preparation method thereof

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Embodiment 1

[0045] A preparation method of starch-grafted coal gangue-coated nano-zero-valent iron composite material, comprising the following steps:

[0046] S1. Prepare starch into 5-10 wt% starch aqueous solution, and gelatinize in a 90°C water bath for 30-60min to obtain starch gelatinization liquid, wherein the concentration of the starch aqueous solution is preferably 5-8 wt%;

[0047] S2. After mixing the dispersant and surfactant, the suspension obtained by ultrasonic dispersion is added to the starch gelatinized liquid prepared in step S1 whose temperature has dropped to 40°C and stirred, and an inert gas is introduced to keep the whole reaction process under control. in an inert atmosphere;

[0048] S3. Add the modified coal gangue to the mixed solution composed of ferrous sulfate heptahydrate and potassium borohydride under the protection of nitrogen, and vigorously stir to obtain the mixed solution a;

[0049] S4. Slowly add the sodium hydroxide solution into the beaker cont...

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Abstract

The invention relates to the field of composite material preparation, in particular to a starch grafted coal gangue coated nano zero-valent iron composite material and a preparation method thereof. Inthe reversed-phase suspension polymerization, a reversed-phase suspension polymerization system consists of a water phase and an oil phase; the water phase is composed of water, starch, an initiator,a cross-linking agent, a polymeric monomer, ferrous sulfate heptahydrate, potassium borohydride and a surfactant, and the oil phase is composed of a dispersing agent; the volume ratio of the water phase to the oil phase is 1-5. The composite material obtained by the invention not only has good adsorption capacity of coal gangue, but also fully utilizes a complex three-dimensional network structure and various active functional groups of starch to stabilize and disperse nano zero-valent iron, can effectively prevent the oxidation of the nano zero-valent iron, and has a good treatment effect onCr (VI) containing water.

Description

technical field [0001] The invention relates to the field of composite material preparation, in particular to a starch-grafted coal gangue-coated nanometer zero-valent iron composite material and a preparation method thereof. Background technique [0002] With the industrial activities such as chromium salt production, electroplating, and leather, as well as agricultural activities such as sewage irrigation and sludge application, hexavalent chromium (Cr(VI)) continuously enters the water body, seriously polluting the water body environment. The United States stipulates that the allowable concentration of chromium in water is set at 50ppb. The toxicity of hexavalent chromium is far greater than that of trivalent chromium, which poses a huge threat to people's environmental health. Scientific research has found that Cr(VI) compounds have carcinogenic effects in the body. Therefore, how to effectively remediate Cr(VI) pollution in water has always been the research focus of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/22
CPCB01J20/02B01J20/24C02F1/281C02F1/286C02F2101/22
Inventor 张岩高平强王蕊
Owner YULIN UNIV
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