Preparation method and dye degrading method of calcium alginate coated zero-valent iron

A calcium alginate, coated technology, applied in the field of water pollution control, can solve the problems of high cost, easy passivation, difficult recovery, etc., and achieve the effects of easy recovery, enhanced reaction performance, and enhanced dispersion.

Inactive Publication Date: 2017-11-24
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

[0005] However, zero-valent iron has the limitations of being easily passivated, agglomerated, and difficult to recycle in environmental water restoration; the advanced oxidation method using Fenton's reagent requires the use of a large amount of hydrogen peroxide solution, and the cost is high, so it is necessary Provide a new type of material to overcome the deficiencies of existing technologies

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  • Preparation method and dye degrading method of calcium alginate coated zero-valent iron
  • Preparation method and dye degrading method of calcium alginate coated zero-valent iron

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Embodiment 1

[0045] A preparation method of calcium alginate-coated zero-valent iron, comprising the following steps

[0046] 1) Prepare a sodium alginate aqueous solution with a mass concentration of 2.5%, stir magnetically until the solution is completely clear and transparent, and let it stand for defoaming;

[0047] 2) Add 5 mL of prepared sodium alginate aqueous solution to 20 mL of 0.3 M CaCl at a rate of 1 mL / min. 2 and 0.15M FeCl 3 in the mixed solution; oscillating coordination for 12 hours; after the coordination is completed, wash repeatedly with ultrapure water for 3 times, that is, calcium alginate-coated iron ion gel balls are prepared;

[0048] 3) The prepared calcium alginate-coated iron ion gel balls were placed in a container bottle, and 15 mL of 0.2 M potassium borohydride (KBH 4 ) aqueous solution, after shaking and reacting for 30 minutes, washed repeatedly 3 times with ethanol aqueous solution (V alcohol: V water = 1:1), that is, calcium alginate-coated zero-valent ...

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Abstract

The invention provides a preparation method and a dye degrading method of calcium alginate coated zero-valent iron. According to the preparation method, sodium alginate serves as a substrate, the sodium alginate, calcium ions and iron ions are coordinated in a cross-linking manner to obtain calcium alginate coated iron ion gel balls, and calcium alginate coated zero-valent iron gel balls are prepared by the aid of a potassium borohydride liquid phase reduction method. According to the dye degrading method, reduction technique of the zero-valent iron and Fenton reaction are jointly used for pollutant reduction and oxidative degradation. Targeted pollutants are thoroughly removed by the aid of a pollutant control technique.

Description

technical field [0001] The invention belongs to the technical field of water pollution control, and in particular relates to the preparation of calcium alginate-coated zero-valent iron and a method for degrading dyes. Background technique [0002] With the rapid development of science and technology, metal iron materials are widely used in the restoration of environmental pollution, and the treatment effect is good. Due to the strong electron transfer ability of iron materials, it has a particularly important impact on the movement, transformation and degradation of pollutants, respectively. Among the restoration technologies related to iron, the reduction of zero-valent iron and Fenton oxidation are the most significant. [0003] Zero-valent iron is the cheapest iron-based source in environmental materials. With the rapid development of science and technology, it is widely used in environmental pollution remediation, and the treatment effect is good. The large specific su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28C02F1/72C02F101/30
CPCB01J31/28C02F1/722C02F1/725C02F2101/308
Inventor 张环魏俊富傅敏孔志云李爽爽
Owner TIANJIN POLYTECHNIC UNIV
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