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Preparation method and application of ultrasonic impregnation modified resin

A modified resin and ultrasonic impregnation technology, applied in the field of water treatment, can solve problems such as increasing the difficulty of removing nitrate, and achieve the effects of easy regeneration and repeated use, simple preparation process and excellent removal.

Inactive Publication Date: 2015-11-04
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional anion exchange resins select the order of adsorbed ions to increase the difficulty of removing nitrates, and the method of removing nitrates by using ultrasonic impregnation to produce iron oxyhydroxide loaded on the surface of the resin has not been reported yet.

Method used

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  • Preparation method and application of ultrasonic impregnation modified resin
  • Preparation method and application of ultrasonic impregnation modified resin
  • Preparation method and application of ultrasonic impregnation modified resin

Examples

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Effect test

Embodiment 1

[0028] A preparation method for ultrasonic impregnation modified resin, comprising the following steps:

[0029] (1) Take a certain volume of fresh resin, add it to 5% to 20% sodium chloride solution at a volume ratio of 1:5 and soak for 2 to 6 hours, then rinse it with deionized water until it is colorless, and dry it naturally to constant weight reserve;

[0030] (2) Weigh the pretreated resin obtained in step (1), and KMnO with a concentration of 2.0g / L~15.0g / L 4 The solution was mixed and impregnated at a volume ratio of 1:2 to 5, and stirred rapidly for 2 hours; then washed and filtered with deionized water until the filtrate was colorless;

[0031] (3) Add the impregnated resin obtained in step (2) to 85.0g / L~176.3g / L FeSO at a volume ratio of 1:2~5 4 ·7H 2 O solution, sealed and ultrasonically impregnated for 30min to 60min, after full reaction, alternately rinsed three times with 1% sodium bicarbonate solution and deionized water, then quickly rinsed with deionized ...

Embodiment 2

[0034] Ultrasonic impregnation modified resin of the present invention is used for processing the nitrate in water body, comprises the following steps:

[0035] The ultrasonic impregnation modified resin prepared in Example 1 was added to 5 groups of 250mL nitrate water bodies with initial concentrations of 5mg / L, 10mg / L, 20mg / L, 40mg / L and 50mg / L respectively, and ultrasonic impregnation The dosage of the modified resin is 0.2g, the initial pH value of the water body is 7.0±0.2, and the constant temperature oscillation reaction is carried out in a water bath at 25°C. After 12 hours, the material is separated from the water body with filter paper, and the ion chromatography is used to The remaining nitrate concentration in the water was measured, and the removal rate of nitrate was calculated. The results are shown in Table 1.

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Abstract

The invention discloses a preparation method and application of an ultrasonic impregnation modified resin. The preparation method comprises: adding a certain volume of fresh resin into a sodium chloride solution to conduct soaking pretreatment; subjecting the pretreated resin and a KMnO4 solution to mixing impregnation, and conducting rapid stirring, then performing washing with deionized water and conducting filtration until the filtrate is colorless; adding the obtained impregnated resin rapidly into an FeSO4.7H2O solution by certain volume ratio, and carrying out sealing and ultrasonic impregnation, after full reaction, using a sodium bicarbonate solution and deionized water to perform alternating flushing to neutral pH, and conducting vacuum drying, thus obtaining the ultrasonic impregnated FeOOH modified resin. Compared with unmodified resin, the resin provided by the invention has greatly improved nitrate removal performance, has a removal rate to 10mg / L nitrate water up to 100%, shows very high adsorption efficiency, and can be widely applied in the field of water treatment.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a preparation method and application of ultrasonic impregnation modified resin. Background technique [0002] With the development of industry, agriculture and social economy, the pollution of water bodies caused by oxidative pollutants has gradually increased. These oxidative substances mainly include nitrate, bromate, perchlorate and volatile organic substances such as chloroform. The most representative pollutant among oxidative pollutants is nitrate. The problem of nitrate pollution in groundwater in my country began to appear at the beginning of this century. In 2005, it was found in the detection report of groundwater in plain agricultural areas of Beijing that: nitrate in shallow groundwater in this area Severely exceeded the drinking water standard in my country (10mg / L); the shallow groundwater with a depth of 3-6m had the worst water quality, with an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F103/06C02F101/16
Inventor 钟宇李小明杨麒赵建伟徐秋翔李思蓓姚福兵曾光明
Owner HUNAN UNIV
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