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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

Inactive Publication Date: 2016-01-06
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently widely used carriers such as commercial ion exchange resins such as D001, D201, and IRA900 use a large amount of highly toxic raw materials such as styrene, nitrobenzene, and chloromethyl ether in the synthesis, and the synthesis process is complicated and produces toxic by-products. Great damage to the environment

Method used

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  • Biomass-based nanometer lanthanum oxide dephosphorization composite adsorbent and preparation method thereof
  • Biomass-based nanometer lanthanum oxide dephosphorization composite adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Mix 6g of dried sawdust with 50mL N,N-dimethylformamide, ultrasonicate for 10min, stir at 25°C for 0.5h, then heat up to 60°C; then add 30mL of epichlorohydrin at 8mL / min Add dropwise to the mixture at a constant speed, stir and react at 60°C for 1 hour; then add 30mL of urea solution dropwise at a constant speed of 10mL / min, stir and react at 60°C for 2 hours. After the reaction, the product was washed with deionized water and ethanol and dried in vacuum 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 therein, and stirred at 25° C. for 3 hours. The material was filtered out with a strainer and dried, and then added to 100 mL of KOH (2.5 wt%) + KCl (2.5 wt%) alkali salt solution, stirred and reacted at 25°C for 4 hours. After ...

Embodiment 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, 60ml of epichlorohydrin was added dropwise at a speed of 15mL / min to the mixed solution at a constant speed, and stirred and reacted at 85°C for 2 hours. Then, 60 mL of trimethylamine solution was added dropwise at a constant speed of 15 mL / min, and stirred and reacted at 85° C. for 3 hours. After the reaction, the product was washed with deionized water and ethanol and dried in vacuum at 50°C for 12 hours to obtain a biomass anion exchange resin containing a strong base quaternary ammonium group;

[0024] (2) Weigh 25gLaCl 3 ·7H 2O was added to the 200 mL HCl solution with a concentration of 0.2 mol / L, the biomass anion exchange resin obtained in step 1 was added therein, and stirred at 30° C. for 5 hours. The material was filtered out with a strainer to dry, and then added to 200 mL of NaOH (5 wt%)+NaCl (5 wt%) alka...

Embodiment 3

[0028] (1) Take 15g of dried Arundos reed and mix it with 200mL N-N dimethylformamide, sonicate for 30min, stir at 20°C for 2 hours, then raise the temperature to 95°C. Then, 100ml of epichlorohydrin was added dropwise at a speed of 20mL / min into the mixture, and stirred at 95°C for 2 hours. Then, 90 mL of triethylamine solution was added dropwise at a constant speed of 20 mL / min, and stirred and reacted 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 strong base quaternary ammonium groups;

[0029] (2) Weigh 35gLa(NO 3 ) 3 ·6H 2 O was added to the 300 mL HCl solution with a concentration of 0.3 mol / L, the biomass anion exchange resin obtained in step 1 was added therein, and stirred at 40° C. for 6 hours. The material was filtered out with a strainer to dry, and then added to 300 mL of KOH (5 wt%)+KCl (5 wt%) alkali salt solution,...

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Abstract

The invention discloses a biomass-based nanometer lanthanum oxide dephosphorization composite adsorbent and a preparation method thereof. According to the composite adsorbent, biomass anion exchange resin is taken as a matrix, and nanometer lanthanum oxide is loaded on the biomass anion exchange resin; the load of the nanometer lanthanum oxide is 0.5 to 22.6 percent by weight percentage of lanthanum; the biomass anion exchange resin is alkali quaternary ammonium group-contained biomass anion exchange resin, and is prepared by performing aminated modification on a biomass material by taking N,N-dimethylformamide as solvent, epichlorohydrin as an etherifying agent and trimethylamine or triethylamine or urea as an aminating agent; the biomass material is selected from maize straw, soybean straw, cassava straw, rice straw, wheat straw, bamboo reed, saw dust or a mixture thereof. The composite adsorbent disclosed by the invention is low in cost and high in adsorption capacity.

Description

technical field [0001] The invention relates to a phosphorus removal adsorbent, in particular to a biomass exchange resin with lanthanum oxide loaded on the surface. Background technique [0002] Phosphorus is one of the key causes of water eutrophication, and it is also a non-renewable precious mineral resource. Therefore, it is of great significance to ensure the discharge of phosphorus in the biochemical tail water and realize the recovery of phosphorus. Relevant studies have shown that metal oxides have a high specific surface area and surface hydroxyl density, have a high degree of adsorption selectivity for group IV elements (including arsenic, phosphorus, etc.), and can be regenerated by adjusting the pH value, so they have been widely used. Adsorption and removal of phosphorus in water. Through the comparison of the adsorption and phosphorus removal performance of various metal oxides, it is found that hydrated lanthanum oxide has excellent adsorption performance f...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/58
Inventor 邱慧梁晨赵云霞许正文刘刚朱敦学谢鑫苗陈旭斌
Owner NANJING UNIV OF INFORMATION SCI & TECH
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