A method for removing heavy metal cadmium in shellfish enzymatic hydrolysis solution
An enzymatic hydrolysate, heavy metal technology, applied in the directions of alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve the problem of adsorption equilibrium time and removal time long, adsorption effect to be improved, chitosan Sugar adsorption capacity is low and other problems, to achieve the effect of good adsorption capacity and selectivity, eliminating local concentration unevenness and agglomeration, and improving adsorption and chelation rate
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Embodiment 1
[0038] (1) Preparation of Fe 3 o 4 magnetic nanoparticles
[0039] FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 Dissolve in deionized water to obtain a mixed solution, FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 The molar ratio is 2:1; add excess ammonia water dropwise to the mixed solution to maintain the pH at 10 to form a black precipitate. Under stirring conditions, heat in a water bath at 80°C for 30 minutes, separate the black precipitate with an external magnetic field, and wash it with deionized water until The pH is neutral and dried in vacuum to obtain Fe 3 o 4 Magnetic nanoparticles, ready to use.
[0040] (2) Preparation of SiO 2 Core-shell magnetic microspheres
[0041] Take 0.4g Fe 3 o 4 After pretreatment, the magnetic nanoparticles were added to the mixed solution of ethanol and water. The mass ratio of ethanol to water in the mixed solution was 4:1. After ultrasonic dispersion, 0.18mL tetraethyl orthosilicate and 0.9mL absolute ethanol were slowly ...
Embodiment 2
[0055] (1) Preparation of Fe 3 o 4 magnetic nanoparticles
[0056] FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 Dissolve in deionized water to obtain a mixed solution, FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 The molar ratio is 2:1; add excess ammonia water dropwise to the mixed solution to maintain the pH at 10 to form a black precipitate. Under stirring conditions, heat in a water bath at 85°C for 25 minutes, separate the black precipitate with an external magnetic field, and wash it with deionized water until The pH is neutral and dried in vacuum to obtain Fe 3 o 4Magnetic nanoparticles, ready to use.
[0057] (2) Preparation of SiO 2 Core-shell magnetic microspheres
[0058] Take 0.5g Fe 3 o 4 After pretreatment, the magnetic nanoparticles were added to the mixed solution of ethanol and water. The mass ratio of ethanol to water in the mixed solution was 5:1. After ultrasonic dispersion, 0.2mL tetraethyl orthosilicate and 1.1mL absolute ethanol were slowly ad...
Embodiment 3
[0072] (1) Preparation of Fe 3 o 4 magnetic nanoparticles
[0073] FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 Dissolve in deionized water to obtain a mixed solution, FeCl 3 ·6H 2 O and Fe(NH 4 ) 2 (SO 4 ) 2 The molar ratio is 2:1; add excess ammonia water dropwise to the mixed solution to maintain the pH at 10 to form a black precipitate. Under stirring conditions, heat in a water bath at 82°C for 28 minutes, separate the black precipitate with an external magnetic field, and wash it with deionized water until The pH is neutral and dried in vacuum to obtain Fe 3 o 4 Magnetic nanoparticles, ready to use.
[0074] (2) Preparation of SiO 2 Core-shell magnetic microspheres
[0075] Take 0.45g Fe 3 o 4 After pretreatment, the magnetic nanoparticles were added to the mixed solution of ethanol and water. The mass ratio of ethanol to water in the mixed solution was 4.5:1. After ultrasonic dispersion, 0.19mL tetraethyl orthosilicate and 1.0mL absolute ethanol were slow...
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