High-activity ferric oxide adsorbant and its prepn
An iron oxide and adsorbent technology, applied in the field of water treatment, can solve the problems of chronic biological toxicity of aluminum ions, narrow optimized pH value range, high raw material cost, and achieve the effects of stable adsorption capacity, prolonged operation period and less loss of adsorbent.
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Embodiment 1
[0022] Prepare a 0.2wt% aqueous solution with PVA with an average molecular weight of 1,845 (polymerization degree 42), and use this solution to dissolve FeCl 3 Prepare FeCl 3 A mixed solution with a concentration of 1.5M. Precipitate the mixed solution with 10M NaOH solution under stirring at room temperature, control the final pH value of the reaction to 2.5, and stir for 30 minutes to complete the reaction. The precipitate was washed with water, dehydrated and dried to obtain adsorbent sample 1. According to the specific surface area measurement, the specific surface area of the adsorbent sample is 165.6m 2 / g, which is 40% higher than that of ordinary hydrated iron oxide; X-ray diffraction results show that the adsorbent is a completely amorphous substance.
[0023] Sample 1 was used for the adsorption of phosphorus in phosphate solution. The adsorption test was carried out at a temperature of 25°C, an initial pH of 3.0, and an initial phosphorus concentration of 50 ...
Embodiment 2
[0025] Prepare a 0.1wt% PVA solution, and use this solution to dissolve Fe 2 (SO 4 ) 3 Prepare a mixed solution with a concentration of 0.2M. The mixed solution was subjected to precipitation reaction with 1M KOH solution under stirring at room temperature, and the final pH value of the reaction was controlled to be 3.5, and the reaction was completed after stirring for 30 minutes. The precipitate was washed with water, dehydrated and dried to obtain adsorbent sample 2.
[0026] Sample 2 was used for the adsorption of phosphorus in phosphate solution. The adsorption test was carried out at a temperature of 25°C, an initial pH of 5.0, and an initial phosphorus concentration of 50 mg / L. Add 0.1g of sample 2 and 0.1g of active powdered alumina to two 100ml water samples respectively, and the measured adsorption amounts after adsorption equilibrium are: sample 2: 28.9mg-P / g; powdered activated alumina: 22.6mg -P / g. Sample 2 is 1.28 times the adsorption capacity per unit weig...
Embodiment 3
[0028] Prepare a 2.0wt% aqueous solution with an average molecular weight of 3 million (polymerization degree 43,000) PAM, and use this solution to dissolve Fe(NO 3 ) 3 Prepare a mixed solution with a concentration of 0.5M. Under room temperature stirring, the mixed solution was hydrolyzed and precipitated with 5M NaOH solution, the final pH of the reaction was controlled to be 4.5, and the reaction was completed after stirring for 30 minutes. The precipitate was washed with water, dehydrated and dried to obtain adsorbent sample 3.
[0029] Sample 3 was used for the adsorption of phosphorus in phosphate solution. The adsorption test was carried out at a temperature of 25°C, an initial pH of 5, and an initial phosphorus concentration of 50 mg / L. To reach the final equilibrium concentration of 0.5mg / L for 100ml of water sample, 0.278g of sample 3 and 0.934g of powdered activated alumina need to be added respectively, and the dosage of sample 3 is 29.8% of activated alumina. ...
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