Modified 4A type molecular sieve and preparation method and application thereof
A molecular sieve and modification technology, applied in chemical instruments and methods, A-type crystalline aluminosilicate zeolite, radioactive purification, etc., can solve problems such as poor selective adsorption effect and low concentration
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[0027] The invention provides a kind of preparation method of modified 4A type molecular sieve, comprises the following steps:
[0028] Sodium aluminate, sodium hydroxide, silica sol and water are mixed, obtain initial gel; Described sodium aluminate, sodium hydroxide and silica sol are respectively with Al 2 o 3 、Na 2 O and SiO 2 Calculated, the mol ratio of described sodium aluminate, sodium hydroxide, silica sol and water is 1:3:2:140;
[0029] The initial gel is subjected to aging and static hydrothermal crystallization in sequence to obtain a type 4A molecular sieve;
[0030] The 4A type molecular sieve is mixed with the lithium ion solution to carry out ion exchange reaction to obtain the modified 4A type molecular sieve.
[0031] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.
[0032] The present invention mixes sodium aluminate, sodium hydroxide, silica sol...
Embodiment 1
[0055] (1) Preparation of modified 4A molecular sieve
[0056] 5.68g of sodium aluminate and 3.391g of sodium hydroxide were added to 67.2g of deionized water and stirred and mixed for 20min at room temperature to obtain a mixed solution; 7.92g of silica sol (SiO 2content of 40%) at room temperature for 40 minutes, then left to stand for 1 hour to obtain an initial gel; the initial gel was left to age in a 75°C water bath for 6 hours, and then the resulting aged product was placed in a reaction kettle, and then Put it in a 95°C oven for static hydrothermal crystallization for 3 hours, centrifuge the obtained product system, wash the obtained solid product with water, and then dry it at 75°C to obtain a 4A molecular sieve; mix the 4A type molecular sieve with 1mol / L Lithium nitrate solution was mixed according to 1g:50mL, ion exchanged at 65°C for 1.5h, exchanged three times, filtered, and the obtained solid product was washed with water and dried at 70°C for 9h to obtain a mod...
Embodiment 2
[0075] According to the method of embodiment 1, prepare 1L containing Sr 2+ Radioactive wastewater, where Sr 2+ The initial concentration is 100mg / L. The modified 4A type molecular sieve prepared by 1g embodiment 1 and comparative example 1 was added to the above-mentioned 1L Sr-containing 2+ In the radioactive waste water, stir at a constant temperature of 25°C with a rotation speed of 300rpm. The control adsorption time is respectively 30s, 1min, 2min, 3min, 5min, 20min, 40min, 60min, suction filtration (22 μm microporous filter membrane), detects Sr in the obtained filtrate according to the method of embodiment 1 2+ Concentration, calculate modified 4A molecular sieve to Sr 2+ The removal rate, the test results are shown in Table 3 and figure 2 (Example 2) and image 3 (comparative example 1) shows, image 3 Among them, Qt represents the adsorption capacity of molecular sieve at time t, and R represents the removal rate of strontium ions.
[0076] Table 3 Effect of ...
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