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Controlled release type potassium ferrate composite as well as preparation method and application thereof

A technology of potassium ferrate and composites, applied in iron compounds, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of low efficiency and instability of one-time dosage, achieve long maintenance time and improve stability Sexuality, the effect of avoiding side effects

Active Publication Date: 2014-07-02
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above problems, the present invention uses the advantages of potassium ferrate to control arsenic-containing groundwater, and overcomes its instability and low efficiency of one-time dosage, and prepares a controlled-release potassium ferrate complex, whose release rate can be adjusted , to achieve the dual purpose of improving its stability and controlling arsenic-containing groundwater, providing a new idea for in-situ treatment of groundwater

Method used

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  • Controlled release type potassium ferrate composite as well as preparation method and application thereof
  • Controlled release type potassium ferrate composite as well as preparation method and application thereof
  • Controlled release type potassium ferrate composite as well as preparation method and application thereof

Examples

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preparation example Construction

[0049] A preparation method of controlled-release potassium ferrate complex, comprising the following steps:

[0050] 1) Add the high molecular polymer into the organic solvent with a boiling point of 40°C to 80°C, stir to dissolve it completely, then add potassium ferrate, porogen, and dispersant, and mix well;

[0051] 2) Pour the mixture in 1) into the emulsification medium to solidify. The solidification temperature is 0°C-20°C, and it is stirred at a speed of 10-30rpm. After the solvent is completely evaporated, filter it with suction, take the filter residue, and dry it to obtain Spherical controlled-release potassium ferrate complex with a particle size of 0.5 to 1.5 cm;

[0052] Among them, the amount of each raw material is weighed according to the following parts by mass: 0.1-0.3 parts of potassium ferrate, 0.8-2.0 parts of high molecular polymer, 10-20 parts of organic solvent, 0.1-0.3 parts of dispersant, 1.0 parts of porogen ~7.0 parts, emulsification medium 60~8...

Embodiment 1

[0070] Example 1 Preparation of Controlled-release Potassium Ferrate Complex

[0071] 1) Preparation of high-purity potassium ferrate:

[0072] a) Weigh 60g KOH and add it into 100mL water to dissolve, cool to room temperature, and put it in an ice-water bath;

[0073] b) Weigh 33.4g of potassium permanganate powder, add 220mL of concentrated hydrochloric acid dropwise to it, and react under slow stirring, the resulting Cl 2 Pass it into the 0.6g / L KOH solution in an ice bath in a) until the solution turns yellow-green and a small amount of white crystals are precipitated to obtain a saturated hypochlorite solution;

[0074] c) Weigh 60g of potassium hydroxide solid and add it into the saturated hypochlorite solution prepared in b), add 5g every 5 minutes, stir slowly to make it fully dissolve, so as to enhance the alkalinity of the solution, and operate under ice To prevent KClO from decomposing, then filter to remove KOH and KCl white crystals to obtain a relatively pure...

Embodiment 2

[0082] Example 2 Preparation of Controlled-release Potassium Ferrate Complex

[0083] 1) Preparation of high-purity potassium ferrate: same as that in Example 1;

[0084] 2) Dissolve 2g of cellulose acetate in 10g of acetone solvent, use a collector type constant temperature magnetic stirrer to control its temperature to 40°C, and control its stirring speed to 20rpm to completely dissolve it;

[0085] 3) Add 0.3g of potassium ferrate, 6g of polyethylene glycol, and 0.1g of Tween-80 to the solution in step 1), mix well and pour it into 60g of liquid paraffin for curing, where the curing temperature is 4 ℃, and use a collector-type constant temperature magnetic stirrer to control the stirring speed to 30rpm, stir for 30min to completely evaporate the solvent, vacuum filter, take the filter residue, and dry at 60-80℃ to obtain spherical controlled-release potassium ferrate complex , and its particle size is 0.5 to 1.5 cm.

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Abstract

The invention discloses a controlled release type potassium ferrate composite as well as a preparation method and application thereof. The preparation method is as follows: by taking a high polymer which is biodegradable and environment-friendly as a framework material, dissolving the high polymer in a low-boiling point organic solvent, adding a pore-foaming agent, a dispersing agent and high-purity potassium ferrate, adding the mixture into a medium for emulsifying and curing, and filtering and drying the cured product to obtain the controlled release type potassium ferrate composite. The composite is in a water environment, so that a net-shaped duct structure is formed in an inert framework material by virtue of the hydrophilcity of the pore-foaming agent, and therefore, the potassium ferrate is effectively aided to release from the composite, and a problem that dissolution of active ingredients is affected due to texture compaction of the framework material is avoided; the composite is different from the conventional disposable oxidant, controllable in release speed in water, uniform in velocity, long in holding time, good in storage stability, and has wide application prospect on in-situ repairing polluted underground water.

Description

technical field [0001] The invention belongs to the field of groundwater pollution restoration technology and application, and discloses a potassium ferrate complex with controlled release function and its preparation and application. Background technique [0002] In recent years, with the development of industrial and agricultural production, the problems of wastewater discharge and atmospheric pollutant deposition have become increasingly serious, and arsenic pollution in water bodies has become a global environmental problem. According to the water arsenic standards of the World Health Organization (WHO), the exposed population in my country's arsenic poisoning hazards is as high as 15 million, and more than tens of thousands of patients have been diagnosed. According to the survey on the distribution of endemic arsenic poisoning in China (general report), endemic arsenic poisoning in drinking water is distributed in 8 provinces, municipalities, and 40 county-level cities...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/52C02F1/28C02F1/50C02F1/62C01G49/00
Inventor 蓝冰燕李来胜王欣馨舒月红
Owner SOUTH CHINA NORMAL UNIVERSITY
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