Preparation method of stratiform bimetallic oxide sorbent capable of effectively removing low-concentrated phosphate radical
A layered bimetal and oxide technology is applied in the field of nanomaterials to achieve the effect of thin lamellae, small particle size and large specific surface area
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Embodiment 1
[0027] 1) Weigh MgCl respectively 2 ·6H 2 O and AlCl 3 9H 2 O, add deionized water to prepare a total metal ion concentration of 0.45mol / L, MgCl 2 and AlCl 3 The molar concentration ratio is 2:1; N,N-dimethylformamide (DMF) and hydrophobic ionic liquid BmimPF are added to the mixed salt solution 6 , where mixed saline solution, DMF and BmimPF 6 The volume ratio of the solution was 4:48:48, stirred magnetically at room temperature for 40 minutes, and the inverse microemulsion A was prepared after the solution changed from turbid to transparent;
[0028] 2) Take a certain volume concentration of 25% ammonia water, add DMF and BmimPF to it 6 , make 25% ammonia water, DMF and BmimPF 6 The volume ratio of the solution was 4:48:48, magnetically stirred at room temperature for 40 minutes, and the inverse microemulsion B was prepared after the solution changed from turbid to transparent;
[0029] 3) Under the condition of magnetic stirring, titrate the inverse microemulsion A ...
Embodiment 2
[0032] 1) With reference to the method and preparation conditions in Example 1 step 1), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio is 7:46.5:46.5, and the inverse microemulsion A is prepared;
[0033] 2) With reference to the method and preparation conditions in Example 1 step 2), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio of is 7:46.5:46.5, and the inverse microemulsion B is prepared;
[0034] 3) Using the method and preparation conditions in step 3) of Example 1, the precursor small particle size ultra-thin hydrotalcite-like nanosheets are obtained;
[0035] 4) Using the method and preparation conditions in Step 4) of Example 1, calcining the precursor small particle size ultra-thin hydrotalcite-like nanosheets obtained in the previous step to obtain a layered double metal oxide adsorbent, denoted as LDO b .
Embodiment 3
[0037] 1) With reference to the method and preparation conditions in Example 1 step 1), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio of is 7:31:62, and the inverse microemulsion A is prepared;
[0038] 2) With reference to the method and preparation conditions in Example 1 step 2), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio of is 7:31:62, and the inverse microemulsion B is prepared;
[0039] 3) Using the method and preparation conditions in step 3) of Example 1, the precursor small particle size ultra-thin hydrotalcite-like nanosheets are obtained;
[0040] 4) Using the method and preparation conditions in Step 4) of Example 1, calcining the precursor small particle size ultra-thin hydrotalcite-like nanosheets obtained in the previous step to obtain a layered double metal oxide adsorbent, denoted as LDO c .
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