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Controlled-release potassium ferrate complex and its preparation and application

A potassium ferrate and complex technology, applied in iron compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of low efficiency and instability in one-time dosing, achieve long maintenance time, improve stability, and purity. high effect

Active Publication Date: 2016-01-20
SOUTH CHINA NORMAL UNIVERSITY
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  • 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 potassium ferrate complex and its preparation and application
  • Controlled-release potassium ferrate complex and its preparation and application
  • Controlled-release potassium ferrate complex and its preparation and application

Examples

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preparation example Construction

[0049] A method for preparing a controlled-release potassium ferrate complex includes the following steps:

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

[0051] 2) Pour the mixture in 1) into the emulsifying medium to solidify, the solidification temperature is 0℃~20℃, and stir at 10~30rpm until the solvent volatilizes completely, suction filter, take the filter residue, and dry 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 to 0.3 parts of potassium ferrate, 0.8 to 2.0 parts of high molecular polymer, 10 to 20 parts of organic solvent, 0.1 to 0.3 parts of dispersant, and 1.0 part of porogen ~7.0 parts, 60~80 parts of emulsifying medium.

[0053] Preferably, the high mol...

Embodiment 1

[0070] Example 1 Preparation of controlled-release potassium ferrate complex

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

[0072] a) Weigh 60g of KOH into 100mL of water to dissolve, cool to room temperature, and place 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 to produce Cl 2 Pour into the 0.6g / mL KOH solution in the 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 to the saturated hypochlorite solution prepared in b). Add 5g every 5 minutes and stir slowly to make it fully dissolved to enhance the alkalinity of the solution. The operation should be done on ice. It is carried out under the condition of bath to prevent the decomposition of KClO, and then filtered to remove the white ...

Embodiment 2

[0082] Example 2 Preparation of controlled-release potassium ferrate complex

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

[0084] 2) Dissolve 2g of cellulose acetate in 10g of acetone solvent, use a heat-collecting thermostatic magnetic stirrer to control its temperature to 40℃, and control its stirring speed to 20rpm to make it completely dissolved;

[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 solidification, where the solidification temperature is 4 ℃, and use a heat-collecting thermostatic magnetic stirrer to control the stirring speed to 30rpm. After stirring for 30min to completely volatilize the solvent, vacuum filter, take the filter residue, and dry at 60~80℃ to obtain spherical controlled-release potassium ferrate complex , Its particle size is 0.5 ~ 1.5cm.

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Abstract

The invention discloses a controlled-release potassium ferrate complex and its preparation and application. Its preparation method is to use a biodegradable and environmentally friendly polymer as a skeleton material, dissolve it in a low-boiling organic solvent, and then add a porogen, a dispersant and high-purity potassium ferrate, and make the mixture It is added into the medium to emulsify and solidify, and the solidified product is filtered and dried to become a controlled-release potassium ferrate complex. When the complex is in the water environment, the hydrophilicity of the porogen makes the inert framework material form a network pore structure, effectively assisting the release of potassium ferrate from the complex, and avoiding the impact of the active ingredient due to the dense texture of the framework material. The problem of dissolution; the complex is different from the traditional one-time oxidant, the release rate in water can be adjusted, the rate is more uniform, the maintenance time is long, and the storage stability is good. It has broad application prospects in the in-situ repair of polluted groundwater .

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 Patents(China)
IPC IPC(8): C02F1/72C02F1/52C02F1/28C02F1/50C02F1/62C01G49/00
Inventor 蓝冰燕李来胜王颖馨舒月红
Owner SOUTH CHINA NORMAL UNIVERSITY
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