Preparation method of lanthanum hydrate oxide modified chitosan adsorbent
A technology of oxides and chitosan, which is applied in chemical instruments and methods, water pollutants, adsorption water/sewage treatment, etc., can solve the problems of slow adsorption speed and achieve fast adsorption speed, environmental friendliness and large adsorption capacity Effect
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Embodiment 1
[0019] A kind of preparation method of lanthanum hydrated oxide modified chitosan adsorbent, described preparation method comprises the following steps:
[0020] Step 1. Weigh 4 parts by mass of chitosan and add 20 parts by mass of 5mol / L NaOH solution, stir until completely dissolved, then add 0.5 part by mass of lanthanum hydrated oxide, stir evenly, let stand for 1 hour, and filter the precipitate.
[0021] Step 2. Rinse the precipitate with deionized water, then dry it at 100°C for 5 hours, take it out, grind it, and sieve it until the particle size is less than 0.1mm to obtain lanthanum hydrated oxide-modified chitosan.
[0022] Step 3. Take 2 parts by mass of activated carbon and add 10 parts by mass of 5wt.% NaOH solution, soak for 6 hours and then filter with suction, then wash with deionized water until neutral, then add 20 parts by mass of 3wt.% HCl solution, soak for 6 hours and then filter with suction , and then washed with deionized water until neutral, and dried...
Embodiment 2
[0026] A kind of preparation method of lanthanum hydrated oxide modified chitosan adsorbent, described preparation method comprises the following steps:
[0027] Step 1. Weigh 7 parts by mass of chitosan and add 30 parts by mass of 5mol / L NaOH solution, stir until completely dissolved, add 1.4 parts by mass of lanthanum hydrated oxide, stir evenly, let stand for 2h, and filter the precipitate.
[0028] Step 2. Rinse the precipitate with deionized water, then dry it at 120°C for 8 hours, take it out, grind it, and sieve it until the particle size is less than 0.1mm to obtain lanthanum hydrated oxide-modified chitosan.
[0029] Step 3. Take 5 parts by mass of activated carbon and add 18 parts by mass of 5wt.% NaOH solution, soak for 8 hours and then filter with suction, then wash with deionized water until neutral, then add 30 parts by mass of 3wt.% HCl solution, soak for 8 hours and then filter with suction , and then washed with deionized water until neutral, and dried at a te...
Embodiment 3
[0033] A kind of preparation method of lanthanum hydrated oxide modified chitosan adsorbent, described preparation method comprises the following steps:
[0034] Step 1. Weigh 6 parts by mass of chitosan and add 25 parts by mass of 5mol / L NaOH solution, stir until completely dissolved, add 1 part by mass of lanthanum hydrated oxide, stir evenly, let stand for 1.5h, and filter the precipitate.
[0035] Step 2. Rinse the precipitate with deionized water, then dry it at 110°C for 7 hours, take it out, grind it, and sieve it until the particle size is less than 0.1mm to obtain lanthanum hydrated oxide modified chitosan.
[0036] Step 3. Take 4 parts by mass of activated carbon and add 15 parts by mass of 5wt.% NaOH solution, soak for 7 hours and then filter with suction, then wash with deionized water until neutral, then add 25 parts by mass of 3wt.% HCl solution, soak for 7 hours and then filter with suction , and then washed with deionized water until neutral, and dried at a tem...
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