Biomass-based nanometer lanthanum oxide dephosphorization composite adsorbent and preparation method thereof
A nano-lanthanum oxide and composite adsorption technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of complex synthesis process, toxic by-products, environmental damage, etc., and achieve simple and clean synthesis process , high adsorption selectivity, and the effect of improving the adsorption capacity
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[0017] Example 1
[0018] (1) Mix 6g of dried sawdust with 50mL of N,N-dimethylformamide, sonicate for 10min, stir at 25°C for 0.5 hour, and then heat up to 60°C; then add 30mL of epichlorohydrin at 8mL / min It was added dropwise to the mixture at a uniform speed, and the reaction was stirred at 60 °C for 1 hour; then 30 mL of urea solution was added dropwise at a constant speed of 10 mL / min, and the reaction was stirred at 60 °C for 2 hours. After the reaction, the product was washed with deionized water and ethanol, and vacuum-dried at 40° C. for 8 hours to obtain a biomass anion exchange resin containing a strong base quaternary ammonium group;
[0019] (2) Weigh 15gLa (NO 3 ) 3 ·6H 2 O was added to 150 mL of HCl solution with a concentration of 0.1 mol / L, the biomass anion exchange resin obtained in step 1 was added to it, and the mixture was stirred at 25° C. for 3 hours. The material was filtered out with a filter screen to dry, and then added to 100 mL of KOH (concen...
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[0022] Example 2
[0023] (1) Mix 10 g of dried corn stalks with 100 mL of N-N dimethylformamide, sonicate for 20 min, stir at 40 °C for 1 hour, and then heat up to 85 °C. Then, 60 ml of epichlorohydrin was added dropwise to the mixed solution at a uniform speed of 15 mL / min, and the reaction was stirred at 85° C. for 2 hours. Then, 60 mL of trimethylamine solution was added dropwise at a constant rate of 15 mL / min, and the reaction was stirred at 85° C. for 3 hours. After the reaction, the product was washed with deionized water and ethanol, and vacuum-dried at 50° C. for 12 hours to obtain a biomass anion exchange resin containing a strong base quaternary ammonium group;
[0024] (2) Weigh 25g LaCl 3 ·7H 2O was added to 200 mL of HCl solution with a concentration of 0.2 mol / L, the biomass anion exchange resin obtained in step 1 was added to it, and the mixture was stirred at 30° C. for 5 hours. The material was filtered out with a filter screen and air-dried, and then ad...
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[0027] Example 3
[0028] (1) Mix 15 g of dried rhododendron with 200 mL of N-N dimethylformamide, sonicate for 30 min, stir at 20 °C for 2 hours, and then heat up to 95 °C. Then, 100 ml of epichlorohydrin was added dropwise to the mixture at a uniform speed of 20 mL / min, and the reaction was stirred at 95° C. for 2 hours. Then, 90 mL of triethylamine solution was added dropwise at a uniform speed of 20 mL / min, and the reaction was stirred at 95° C. for 4 hours. After the reaction, the product was washed with deionized water and ethanol and dried in vacuum at 50° C. for 16 hours to obtain a biomass anion exchange resin containing a strong base quaternary ammonium group;
[0029] (2) Weigh 35gLa (NO 3 ) 3 ·6H 2 O was added to 300 mL of HCl solution with a concentration of 0.3 mol / L, the biomass anion exchange resin obtained in step 1 was added to it, and the mixture was stirred at 40° C. for 6 hours. The material was filtered out with a filter screen to dry, and then added...
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