Cerium/aluminum modified montmorillonite fluoride removal adsorbing agent and preparation method thereof

A technology of montmorillonite and adsorbent, which is applied in the field of fluorine removal adsorbent based on modified montmorillonite and its preparation, can solve the problems of reducing fluorine removal cost and high cost of fluorine removal, and achieves cost saving and wide application of pH , cost reduction effect

Inactive Publication Date: 2017-06-13
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a cerium and aluminum co-modified montmorillonite defluoridation adsorbent and a preparation method thereof, in order to enable active components between cerium and aluminum and montmorillonite to play an active role. Synergistic effect to obtain good adsorption capacity, and at the same time overcome the disadvantage of high cost of adsorption and removal of fluorine by using rare earth metal or rare earth metal modified montmorillonite, and further reduce the cost of fluoride removal

Method used

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  • Cerium/aluminum modified montmorillonite fluoride removal adsorbing agent and preparation method thereof
  • Cerium/aluminum modified montmorillonite fluoride removal adsorbing agent and preparation method thereof
  • Cerium/aluminum modified montmorillonite fluoride removal adsorbing agent and preparation method thereof

Examples

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Embodiment 1

[0040] This embodiment prepares cerium / aluminum modified montmorillonite defluoridation adsorbent according to the following steps:

[0041] (1) Place the montmorillonite at 105° C. for 2 h, after cooling, put 10 g of montmorillonite and 0.5 g of sodium carbonate into a beaker, add 200 mL of deionized water to form a suspension with a mass ratio of 5%, Swell overnight, then stir at high speed for 1.5h to obtain a montmorillonite suspension;

[0042] (2) Prepare 0.2mol / L (calculated by aluminum) aluminum chloride solution, prepare 0.1mol / L (calculated by cerium) cerium nitrate solution; according to the molar ratio of cerium and aluminum is 1:5, the aluminum chloride The solution and the cerium nitrate solution are evenly mixed to make a cerium-aluminum mixed solution;

[0043] (3) Configure a 1.0mol / L sodium hydroxide solution, slowly add sodium hydroxide to the above-mentioned cerium-aluminum mixture at 60°C and keep stirring, and finally the aluminum and OH - The molar rat...

Embodiment 2

[0049] In this example, a cerium / aluminum modified montmorillonite fluorine-removing adsorbent was prepared by the same method as in Example 1.

[0050] Use nitric acid and sodium hydroxide solution to prepare sodium fluoride solutions with a fluoride ion concentration of 4 mg / L at a pH of 2.0, 4.0, 6.0, 8.0, 10.0, and 12.0.

[0051] Weigh 0.1 g of the cerium-aluminum modified montmorillonite fluorine-removing adsorbent of this embodiment, add it to 50 mL of the above-mentioned sodium fluoride solution with different pH values, seal it with a plastic wrap, and place it in a shaker at 25 ° C. 160r / min. Take it out after 12 hours, extract the supernatant and detect the concentration of fluoride ion, aluminum ion and cerium ion in the solution after centrifugal filtration. Make 3 parallel samples. Experimental results such as figure 1 shown.

[0052] Depend on figure 1 It can be seen that when the pH of the water sample is between 4.0 and 8.0, the adsorption effect of the ce...

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Abstract

The invention discloses a cerium / aluminum modified montmorillonite fluoride removal adsorbing agent and a preparation method thereof. The adsorbing agent comprises a montmorillonite carrier and active ingredients of the carrier: cerium and aluminum. The preparation method comprises the following preparation processes: sodium treatment of montmorillonite, preparation of pillar liquid, pillar modification of the montmorillonite, calcination, smashing and sieving of modified montmorillonite solids and the like. According to the fluoride removal adsorbing agent, a synergistic effect can be achieved between the active ingredients and the montmorillonite, so that the adsorbing agent is good in adsorption capacity and wide in applicable pH range; the defect of high cost of fluoride removal by adsorption with a single rare-earth metal or rare-earth metal modified montmorillonite is overcome, so as to lower the cost of fluoride removal; in addition, secondary pollution is not caused, so that the adsorbing agent can be used for treating high fluorine drinking water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to an adsorbent that can be used to treat high-fluorine water and a preparation method thereof, in particular to a modified montmorillonite-based fluorine removal adsorbent and a preparation method thereof. Background technique [0002] Fluorine is one of the essential trace elements for the human body. It is an important component of teeth and bones. Adequate intake of fluorine can improve the resistance of tooth enamel to bacterial acid corrosion and prevent dental caries, but excessive fluorine can be harmful to the human body. Long-term drinking of high-fluoride water can lead to chronic fluorosis, which seriously damages teeth and bones, and affects the cardiovascular and nervous systems. The specific manifestations are enamel damage, premature tooth loss, osteoporosis, bone deformation, and brain damage. my country's "Drinking Water Hygienic Standards" (GB5749-2006) stip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/14
CPCB01J20/12B01J20/0207B01J20/0248C02F1/281C02F2101/14
Inventor 王文静陈天虎徐翘胡真虎王飞鸽
Owner HEFEI UNIV OF TECH
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