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
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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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