Magnetic covalent bond type chitosan-based modified flocculant and preparation method and application thereof
A technology of chitosan and covalent bond, which is applied in the field of magnetic covalent bond chitosan-based modified flocculant and its preparation, can solve the problem of high price of graphene oxide, unfavorable large-scale application, poor flocculation effect, etc. problems, to achieve good chemical stability, broaden the applicable range of pH, and improve the demulsification ability
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[0040] The invention provides a preparation method of a magnetic covalent bond type chitosan-based modified flocculant, comprising the following steps:
[0041] (1) The magnetic Fe 3 O 4 Nanoparticles were dispersed in a mixed solvent of ethanol and water to obtain Fe 3 O 4 Dispersions;
[0042] (2) the Fe 3 O 4 The dispersion liquid is mixed with ammonia water to obtain alkaline Fe 3 O 4 Dispersions;
[0043] (3) the basic Fe 3 O 4 The dispersion is mixed with tetraethyl orthosilicate reaction to obtain Fe 3 O 4 @SiO 2 Material;
[0044] (4) the Fe 3 O 4 @SiO 2 Material, ethanol and silane coupling agent are mixed to carry out the first graft copolymerization reaction to obtain Fe grafted with silane coupling agent 3 O 4 @SiO 2 ;
[0045] (5) Grafting Fe with the silane coupling agent 3 O 4 @SiO 2 , water, modified chitosan (MCS) and an initiator are mixed to carry out the second graft copolymerization reaction to obtain a magnetic covalent bond type ...
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[0060] Example 1
[0061] (1) 2g magnetic Fe 3 O 4 The nanoparticles were added to a mixed solution of 200 mL of anhydrous ethanol and 50 mL of deionized water, and sonicated for 20 min until the magnetic nuclei were uniformly dispersed to obtain Fe. 3 O 4 Dispersions;
[0062] (2) 8mL ammoniacal liquor is added to the Fe of step (1) 3 O 4 In the dispersion liquid, ultrasonicate for 10 minutes to make it fully mixed, so that the pH of the mixed solution is 9 to 10, to obtain alkaline Fe 3 O 4 Dispersions;
[0063] (3) basic Fe gained in step (2) 3 O 4 The dispersion liquid was placed in a water bath, and the temperature was kept at 40 °C. 3 mL of tetraethyl orthosilicate was added dropwise using a peristaltic pump, and the mixture was stirred electrically at 400 rpm for 6 h. After the reaction was completed, the mixture was magnetically separated. After washing with water ethanol and deionized water for 3 times in turn, vacuum drying at 60 °C for 12 h to obtain Fe 3...
Example Embodiment
[0067] Example 2
[0068] (1) 2g magnetic Fe 3 O 4 The nanoparticles were added to a mixed solution of 200 mL of anhydrous ethanol and 50 mL of deionized water, and sonicated for 20 min until the magnetic nuclei were uniformly dispersed to obtain Fe. 3 O 4 Dispersions;
[0069] (2) 8mL ammoniacal liquor is added to the Fe of step (1) 3 O4 In the dispersion liquid, ultrasonicate for 10 minutes to make it fully mixed, so that the pH of the mixed solution is 9 to 10, to obtain alkaline Fe 3 O 4 Dispersions;
[0070] (3) basic Fe gained in step (2) 3 O 4 The dispersion liquid was placed in a water bath, and the temperature was kept at 40 °C. 3 mL of tetraethyl orthosilicate was added dropwise using a peristaltic pump, and the mixture was stirred electrically at 400 rpm for 6 h. After the reaction was completed, the mixture was magnetically separated. After washing with water ethanol and deionized water for 3 times in turn, vacuum drying at 60 °C for 12 h to obtain Fe 3 O...
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