Dye adsorbent capable of effectively removing anions from wastewater and preparation method of dye adsorbent

An anionic dye and adsorbent technology, applied in chemical instruments and methods, textile industry wastewater treatment, adsorption water/sewage treatment, etc., can solve the problems of poor stability, slow sedimentation, easy dissolution, etc., and achieve good stability and simple operation , the effect of high adsorption capacity

Inactive Publication Date: 2014-07-02
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chitosan itself also has problems, such as easy solubility in acidic solution, slow sedimentation, poor stability, etc., which affect its application.

Method used

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  • Dye adsorbent capable of effectively removing anions from wastewater and preparation method of dye adsorbent
  • Dye adsorbent capable of effectively removing anions from wastewater and preparation method of dye adsorbent
  • Dye adsorbent capable of effectively removing anions from wastewater and preparation method of dye adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-11

[0019] Weigh 20 mg of the prepared metal zirconium-chitosan composite microspheres and add to 100 mL, pH=2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 50 mg / L and 100 mg / L orange yellow In II dye solution, wherein, pH=2,3,4,5,6,7,8,9,10,11,12 respectively correspond to embodiment 1,2,3,4,5,6,7,8, 9, 10, 11; Stir at room temperature for 24 hours, stand to separate, and use UV-visible spectrophotometry to measure the concentration of dye in the solution. The test results of dye adsorption and removal rate in wastewater are shown in Table 1. As can be seen from the test results in Table 1, when the pH value of the solution was less than 5, the adsorption capacity of the metal zirconium-chitosan composite microspheres to the dye was close to the maximum adsorption capacity, and the removal rate of the dye was greater than 95%; when the pH value of the solution was greater than At 11 o'clock, the metal zirconium-chitosan composite microspheres hardly adsorbed the dye, and the removal rate was...

Embodiment 12-19

[0023] Weigh 20 mg of the prepared metal zirconium-chitosan composite microspheres and add them to 100 mL, pH=2, initial concentration of 50, 80, 100, 120, 150, 180, 200, 250, 300 mg / L orange II dye solution , wherein, the initial concentration is 50, 80, 100, 120, 150, 180, 200, 250, 300mg / L respectively corresponding to Example 12, 13, 14, 15, 16, 17, 18, 19; stirring at room temperature for 24h, static The concentration of the dye in the solution was measured by UV-Vis spectrophotometry, and the test results of dye adsorption and removal rate in the wastewater are shown in Table 2. It can be concluded from Table 2 that the adsorption capacity increases gradually with the increase of the initial concentration, while the removal rate decreases; when the initial concentration is greater than 200mg / L, the adsorption capacity increases slowly, indicating that the adsorbent is about to reach saturation at this time. When the concentration of the solution is less than 100mg / L, the...

Embodiment 20-22

[0028] Weigh 20 mg of the prepared metal zirconium-chitosan composite microspheres and add them to 100 mL, pH=2, and the initial concentration of 50, 100, 200 mg / L orange II dye solution, wherein the initial concentration is 50, 100, 200 mg / L L corresponds to Examples 20, 21, and 22 respectively; water bath temperature control, stirring at 4°C, 20°C, and 40°C for 24 hours, standing for separation, and using UV-visible spectrophotometry to measure the concentration of the dye in the solution. The adsorption capacity and removal rate test results are shown in Table 3. From the experimental data in Table 3, it can be concluded that with the increase of temperature, the adsorption amount of metal zirconium-chitosan composite microspheres to dye molecules increases gradually, and the removal effect becomes better. This indicated that the adsorption process of this adsorbent to dye molecules was an endothermic reaction, and the increase in temperature was beneficial to the removal o...

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Abstract

The invention relates to a dye adsorbent for effectively removing anions from wastewater. The dye adsorbent is zirconium metal and chitosan composite microspheres. A preparation method comprises the following specific steps: dissolving chitosan powder in 2% acetic acid solution; adding 0.1mol / L zirconium oxychloride, stirring for 2 to 3 hours at normal temperature to form a uniform composite solution; spraying ammonia water or sodium hydroxide solution into the solution in a spraying mode and solidifying the solution to obtain a solidified solution; adding a glutaraldehyde solution with the mass fraction of 5 percent for performing cross-linking; stirring for 2 to 4 hours; putting the glutaraldehyde solution in the environment at 2 to 6 DEG C and continuously performing cross-linking for 10 to 14 hours; washing the glutaraldehyde solution to neutral by using deionized water after the cross-linking reaction; freezing and drying so as to obtain the zirconium metal and chitosan composite microspheres. The zirconium metal and chitosan composite microspheres adsorbent prepared by the invention has the high acid resistance and the high adsorption capacity; the density of the zirconium metal and chitosan composite microspheres adsorbent is greater than that of water; the natural sedimentation separation is realized; the preparation method is easy to operate, environmentally-friendly and low in cost, and has a good application prospect.

Description

【Technical field】 [0001] The invention relates to the technical field of new environmental functional materials, in particular to an adsorbent for efficiently removing anionic dyes in wastewater and a preparation method thereof. 【Background technique】 [0002] Dyes are closely related to our life, and the colorful world is inseparable from dyes. However, the production and use of dyes will generate a large amount of industrial wastewater, which is one of the main harmful industrial wastewater. Most of the organic matters in dye wastewater are aromatic compounds with chromogenic groups, which are highly polluting. The acidity of dye wastewater will directly affect the normal pH of the water body, and the pollutant components are complex and high in content, with high chromaticity, chemical oxygen demand and biological oxygen demand. The development in the direction of decomposing, anti-oxidation, and anti-degradation makes the treatment of dye wastewater more difficult. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F103/30
Inventor 张玲帆张文清陈林枭夏玮徐志珍
Owner EAST CHINA UNIV OF SCI & TECH
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