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Zirconium loaded biological composite adsorbent used for removing fluorine in water, and regeneration method and applications thereof

A composite adsorption and biological technology, applied in water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of hindering adsorption mass transfer efficiency, lack of nano-size effect, low working adsorption capacity, etc. Work efficiency and application space, realize the effect of purification and safety control, and easy control of production process

Inactive Publication Date: 2019-08-09
ZHEJIANG SHUREN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the carriers commonly used in the carrier immobilization technology are polarized, such as activated carbon and ultra-high cross-linked resin carriers, etc., which are mainly micropores. The fine microporous structure of this kind of composite functional adsorption material carrier hinders the adsorption and mass transfer efficiency. The high-speed (20-100BV / h) fluid adsorption system has the disadvantage of low working adsorption capacity; for zeolite and macroporous resin carriers, the channels are wide, although the adsorption and mass transfer performance of composite materials is beneficial, but its macroporous structure often This leads to particle growth and local agglomeration of the loaded inorganic adsorbent, resulting in the loss of nano-size effect and low adsorption capacity

Method used

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  • Zirconium loaded biological composite adsorbent used for removing fluorine in water, and regeneration method and applications thereof
  • Zirconium loaded biological composite adsorbent used for removing fluorine in water, and regeneration method and applications thereof
  • Zirconium loaded biological composite adsorbent used for removing fluorine in water, and regeneration method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Preparation of zirconium-loaded biocomposite adsorbent 1

[0032] 4g zirconium oxychloride (ZrOCl 2 ) was dissolved in 100 mL of water, and after being stirred by a stirrer, 20% sodium hydroxide was added, and the pH was adjusted to 6.5 with dilute hydrochloric acid. Heated in a water bath at 70°C, suction-filtered the white precipitate, washed the precipitate with distilled water until neutral, dried at 110°C for 1 hour, cooled and pulverized. Weigh 4 g of Artemia egg shells, wash them with deionized water until neutral, and dry them. The activated zirconia and Artemia egg shells after the above treatment were placed in 100 mL of absolute ethanol solution, and ultrasonicated at room temperature for 4 hours at a frequency of 60 Hz. Afterwards, magnetic stirring was performed for 4 hours to carry out the in-situ precipitation reaction, and zirconium hydroxide was generated in the pores of Artemia eggshells, and all the eggshells sank to the bottom of the con...

Embodiment 2

[0033] Embodiment 2: Preparation 2 of loaded zirconium biocomposite adsorbent

[0034] 15g zirconium oxychloride (ZrOCl 2 ) was dissolved in 150 mL of water, and after being stirred by a stirrer, 20% sodium hydroxide was added, and the pH was adjusted to 7.0 with dilute hydrochloric acid. Then heat in a water bath at 50°C, suction filter the white precipitate, wash the precipitate with distilled water until neutral, then dry at 100°C for 2 hours, cool and pulverize. Weigh 5 g of Artemia egg shells, wash them with deionized water until neutral, and dry them. The activated zirconia and Artemia egg shells after the above treatment were placed in 150 mL of absolute ethanol solution, and ultrasonicated at room temperature for 6 hours at a frequency of 100 Hz. Afterwards, magnetic stirring was performed for 5 hours to carry out in-situ precipitation reaction, and zirconium hydroxide was generated in the pores of Artemia eggshells, and all the eggshells sank to the bottom of the co...

Embodiment 3

[0035] Example 3: Removal of fluoride ions in water and regeneration 1 by using zirconium-loaded biocomposite adsorbent

[0036] Put 6g of the above-mentioned zirconium-loaded biocomposite adsorbent in a glass adsorption column (ф12×220mm), and fluoride-contaminated water (F - =1.5mg / L and SO 4 2- =100mg / L, Cl - =100mg / L, NO 3 - =100mg / L, pH=6) flow through the adsorption column equipped with biocomposite material from top to bottom, the temperature is controlled at 15°C, the flow rate is 10BV / h, and the concentration of fluorine ion in the effluent after adsorbent treatment is 1.0mg / L Below, the processing capacity is as high as 1000BV. When there is obvious leakage of adsorption (F - >1.0mg / L), stop the adsorption. Regenerate with 50mL NaOH and NaCl mixed solution (NaOH mass concentration is 3%; NaCl mass concentration is 2%), control regeneration flow rate to 1BV / h, temperature 25°C, complete regeneration after 4BV desorption reaction (desorption rate is as high as 9...

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Abstract

The invention discloses a zirconium loaded biological composite adsorbent used for removing fluorine in water, and a regeneration method and applications thereof. The zirconium loaded biological composite adsorbent used for removing fluorine in water is prepared from zirconium oxychloride, artemia salina egg shell, sodium hydroxide, and ethanol, can be used for removing trace amount fluorinion inwater, and is capable of maintaining relatively large adsorption capacity and relatively high selectivity when there are other co-existing ions in water body. According to fluorine-containing sewage processed using the zirconium loaded biological composite adsorbent, when the discharged water fluorinion concentration is higher than 1.0mg / L, adsorption is stopped, and a mixed solution of NaOH and NaCl is adopted for regeneration of the zirconium loaded biological composite adsorbent. The zirconium loaded biological composite adsorbent is excellent in fluorine removing effect; production technology is easy to control; production cost is relatively low; the zirconium loaded biological composite adsorbent can be stored steadily for about 1 year, and can be used for processing of drinking water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a zirconium-loaded biocomposite adsorbent for removing fluorine in water, a regeneration method and application. Background technique [0002] Fluorine is one of the essential trace elements for the human body. It usually exists in the atmosphere, water and soil in a combined form, and the fluorine pollution caused by humans is the main factor. Fluorine pollution mainly comes from glass manufacturing industry, metal processing industry, chemical industry, and high-tech industries such as semiconductor manufacturing. When these wastewaters are directly discharged, the groundwater will be seriously polluted. If you drink high-concentration fluoride-containing water for a long time, it will affect the metabolism of calcium and phosphorus in the human body, and make the body's metabolism and physiological functions hinder, resulting in some fluorosis such as denta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/14
CPCB01J20/06B01J20/24C02F1/288C02F2101/14
Inventor 陆胤张雯冯佳宇玛青叶明立陈川许晓路许惠英
Owner ZHEJIANG SHUREN UNIV
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