Shell powder and chitosan composite microspheres for absorbing heavy metals, and preparation method of shell powder chitosan composite microspheres
A technology for adsorbing heavy metals and composite microspheres, applied in alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc. , to achieve the effect of improving complexing ability, high mechanical strength and increasing mechanical stability
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[0018] Example 1:
[0019] A shell powder chitosan composite microsphere capable of adsorbing heavy metals, wherein the weight ratio of chitosan powder to shell powder in the composite microsphere is 1:0.3-0.45, and the diameter of the composite microsphere is 0.4-0.6 mm.
[0020] A preparation method of shell powder chitosan composite microspheres for adsorbing heavy metals, including coarse shell powder preparation, nano shell powder preparation, composite microsphere preparation, and composite microsphere modification, specifically including the following steps:
[0021] 1) Preparation of coarse shell powder: clean the shells, soak them in dilute acid solution for 4-5h, then neutralize and wash with dilute lye to remove impurities on the surface of the shells, finally wash with water, dry, and then at 900-1000℃ After calcination for 2-3h, cool to room temperature, pass through a 150-200 mesh sieve after grinding to obtain coarse shell powder;
[0022] 2) Preparation of nano shell p...
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[0027] Example 2:
[0028] A shell powder chitosan composite microsphere capable of adsorbing heavy metals, the weight ratio of chitosan powder to shell powder in the composite microsphere is 1:0.45, and the diameter of the composite microsphere is 0.4-0.6 mm.
[0029] A preparation method of shell powder chitosan composite microspheres for adsorbing heavy metals specifically includes the following steps:
[0030] 1) Preparation of coarse shell powder: clean the shells, soak them in dilute acid solution for 5h, then neutralize and wash with dilute lye to remove impurities on the surface of the shells, finally wash with water, dry, and then calcinate at 900℃ for 3h, Cool to room temperature, pass through a 150-mesh sieve after grinding to obtain coarse shell powder;
[0031] 2) Preparation of nano shell powder: add 2.2% of the weight of the coarse shell powder to the coarse shell powder, and then use a nano pulverizer to pulverize to obtain the nano shell powder with a particle size of...
Example Embodiment
[0036] Example 3:
[0037] A shell powder chitosan composite microsphere capable of adsorbing heavy metals, wherein the weight ratio of chitosan powder to shell powder in the composite microsphere is 1:0.38, and the diameter of the composite microsphere is 0.4-0.6 mm.
[0038] A preparation method of shell powder chitosan composite microspheres for adsorbing heavy metals, including coarse shell powder preparation, nano shell powder preparation, composite microsphere preparation, and composite microsphere modification, specifically including the following steps:
[0039] 1) Preparation of coarse shell powder: clean the shells, soak them in dilute acid solution for 4.5h, then neutralize and wash with dilute lye to remove impurities on the surface of the shells, finally wash with water, dry, and then calcinate at 950℃ for 2.5 h, cool to room temperature, pass through a 180-mesh sieve after grinding to obtain coarse shell powder;
[0040] 2) Preparation of nano shell powder: Add 2.0% of t...
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