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Adsorbent for removing fluorine ions in water body and preparation method and application method of adsorbent

An application method and adsorbent technology, applied in the direction of chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of secondary pollution adsorption performance, narrow pH application range, complex preparation process, etc., and achieve physical Strong chemical stability, low equipment requirements and simple process

Active Publication Date: 2012-07-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the commonly used adsorbents still have some shortcomings, such as complex preparation process, high cost, narrow pH range, secondary pollution or poor adsorption performance, and the adsorption capacity of fluoride ions is generally only 3-30 mg·g-1 about

Method used

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  • Adsorbent for removing fluorine ions in water body and preparation method and application method of adsorbent
  • Adsorbent for removing fluorine ions in water body and preparation method and application method of adsorbent
  • Adsorbent for removing fluorine ions in water body and preparation method and application method of adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 Preparation of iron-aluminum composite oxide nanoparticle adsorbent

[0019] Take 0.5g of sodium lauryl sulfate and add it to 100mL of deionized water, place it in a 500mL four-neck flask, and add 1mol / L NaOH (about 1-2 drops) dropwise to make the pH value about 11. Take 3.89g of FeCl 3 ·6H 2 O and 2.29 g FeCl 2 4H 2 O (the molar ratio is 1.25:1) is miscible in 50mL of 0.25mol / L hydrochloric acid solution, and then added dropwise to the four-necked flask reactor, and N 2 , fully stirred at 80°C (240-260r / min) for 1.5h, and adjusted the pH with NaOH to maintain the pH at about 11.0. After cooling, standing, and washing with deionized water for 3 times, ultrasonic for 10 minutes, then add 5.73gAl 2 (SO 4 ) 3 18H 2 O, adjust the pH to 5.0, blow nitrogen, stir at 70°C (240-260r / min) for 1.5 hours, cool, let stand, and wash with deionized water for 3 to 6 times, and put the washed product into an oven at 60°C Dry to constant weight and dry to obtain the...

Embodiment 2

[0022] At room temperature, use 100 mg of the adsorbent prepared in Example 1 for 100 mL of 10.64 mg L -1 The fluorine-containing solution was subjected to adsorption reaction, and the reaction time was 7 hours; the initial pH of the fluoride-containing solution was adjusted to 2.15, 3.15, 4.02, 5.10, 6.14, 7.11, 7.92, 9.06, 10.02, 10.95, and 11.94. After adsorption, the solution was filtered with sand core, and the concentration of fluoride ion in the filtrate was determined by fluoride ion selective electrode method. Table 1 shows the fluoride ion concentration and adsorption rate after adsorption at different initial pH values ​​of the solution. It was found that in the range of pH 4-10, the removal rate of fluorine ion by the adsorbent reaches about 90%.

[0023] Table 1

[0024]

Embodiment 3

[0026] At room temperature, with 100 mg of the adsorbent prepared in Example 1, the initial pH of the 100 mL solution is 7.0, and the F-concentration is 9.01 mg L -1 The solution undergoes adsorption reaction, wherein the reaction time is controlled at 5, 10, 20, 40, 60, 90, 120, 180, 240, 330, 420 min. After the reaction, the mixed solution was filtered and collected in a dry beaker, and the concentration of fluoride ions in the filtrate was determined by a fluoride ion selective electrode method. Table 2 shows the solution concentration and adsorption rate of fluoride ions under different reaction times.

[0027] It can be seen that the adsorbent of the present invention has a fast adsorption rate for fluorine ions, and the adsorption equilibrium is reached after 2 hours of reaction, and the adsorption rate has reached about 94%. (GB5749-2006).

[0028] Table 2

[0029]

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Abstract

The invention relates to an adsorbent for removing fluorine ions in a water body, and a preparation method and an application method of the adsorbent. The preparation method of the adsorbent comprises the steps of: dissolving FeCl3.6H2O and FeCl2.4H2O in hydrochloric acid solution, dropwise adding into 0.2-0.5% of lauryl sodium sulfate solution, stirring at a temperature of 70-90 DEG C, washing, ultrasonically processing, adding Al2(SO4)3.18H2O, stirring at the temperature of 70 DEG C, cooling and standing, filtering, washing, and drying to obtain the adsorbent. The adsorbent is simple in preparation process, low in cost, magnetic and easy in solid-liquid separation; the adsorbent has good effect of removing fluorine ions in the water body and no secondary pollution; fluorine-containing solution with a fluorine concentration of lower than 10mg / L is treated by the adsorbent at room temperature, and the fluorine concentration in the water treated by the adsorbent is lower than 1mg / L, so that the adsorption speed is fast; the adsorbent is wide in pH range and high in adsorption rate; and the adsorption amount of fluorine ions is large and can reach 63.8mg / g.

Description

technical field [0001] The invention belongs to the technical field of adsorbents and water treatment thereof, and specifically relates to an adsorbent for removing fluoride ions in water bodies and a preparation and application method thereof, which are suitable for deep purification of industrial waste water, as well as drinking water, groundwater, lakes, rivers, etc. Removal of fluoride ions in water. Background technique [0002] Fluoride ions are highly polar active anions. High concentrations of fluoride ions in industrial circulating water lead to accelerated corrosion of pipeline equipment, shorten the service life of equipment pipelines, and reduce production efficiency. Moreover, the discharge of high-concentration fluorine-containing wastewater causes environmental pollution and seriously affects the safety of drinking water for residents. Long-term drinking of high-fluoride water can lead to dental fluorosis and skeletal fluorosis. In my country, most provinces,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/30C02F1/28C02F1/58
Inventor 杨卫春柴立元赵娜杨志辉王海鹰李青竹
Owner CENT SOUTH UNIV
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