Preparation method of pei modified carboxylated chitosan heavy metal wastewater adsorbent by microfluidic control
A carboxylated chitosan and adsorbent technology, which is applied in chemical instruments and methods, alkali metal compounds, adsorption water/sewage treatment, etc., can solve the problem of long treatment cycle, high operating cost and raw material cost, and small single treatment volume and other problems, to achieve the effect of improving the adsorption rate and adsorption capacity, good industrial application prospects, and simple and effective preparation methods
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Embodiment 1
[0021] Example 1: Utilize this patent to prepare polyethyleneimine modified carboxylated chitosan adsorbent to adsorb copper ions in copper sulfate solution.
[0022] Step one: the chitosan aqueous solution prepared by 2wt% carboxylated chitosan (viscosity 200mPa S) and 1.5wt% glacial acetic acid is used as dispersed phase, the n-octanol solution that will add 2wt% Span 80 surfactant As a continuous phase; by means of a single-channel syringe pump and a dual-channel syringe pump, the dispersed phase and the continuous phase are respectively passed into the focusing flow microfluidic chip to obtain carboxylated chitosan micro-droplets with uniform particle size;
[0023] Step 2: Pass the carboxylated chitosan micro-droplet of gained in step 1 into the cross-linking solidification liquid (0.7wt% glutaraldehyde, 2wt% n-octane solution of Span 80), stir slowly, react 1 Hours, after the chitosan droplets are fully cross-linked; sequentially wash 3-4 times with diluted 20% ethanol s...
Embodiment 2
[0027] Example 2: Utilize this patent to prepare polyethylenimine modified carboxylated chitosan adsorbent to adsorb cobalt ions in cobalt chloride solution.
[0028] Polyethyleneimine modified carboxylated chitosan adsorbent was prepared according to Example 1.
[0029] Weigh 0.3g polyethyleneimine modified carboxylated chitosan adsorbent and add it to 200mL cobalt chloride solution with initial pH value of 5 and cobalt ion concentration of 1000ppm. Stand for adsorption, and take 5mL of cobalt chloride solution after the reaction is balanced, and measure it with an ICP plasma spectrometer. Finally, it was measured that the modified chitosan adsorbent reached adsorption equilibrium after 116 hours, and the final adsorption amount of cobalt ions was 56.7 mg / g. Experiments have proved that the chitosan adsorbent of the present invention has better adsorption performance on cobalt ions.
Embodiment 3
[0030]Example 3: The modified chitosan adsorbent prepared by the present invention is used to selectively adsorb copper ions in the mixed solution of copper sulfate and aluminum chloride.
[0031] Polyethyleneimine modified carboxylated chitosan adsorbent was prepared according to Example 1.
[0032] Weigh 0.3g polyethylenimine modified carboxylated chitosan adsorbent and add it to 200mL copper sulfate and aluminum chloride mixed solution with initial pH value of 5 and copper ion and aluminum ion concentration of 1000ppm. Stand for adsorption, and take 5mL of the mixed solution after the reaction is balanced, and measure it with an ICP plasma spectrometer. It was finally measured that the polyethylenimine modified carboxylated chitosan adsorbent reached the adsorption equilibrium after 102 hours, the final adsorption capacity of copper ions was 68.7 mg / g, and the final adsorption capacity of aluminum ions was 0.2 mg / g. Experiments have proved that the polyethylenimine modifie...
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