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Method for adsorbing and removing phosphates from water body by using zirconium oxide modified carbon nano tubes

A technology of carbon nanotubes and phosphate, which is applied in the field of removing phosphate in water and adsorption method to remove phosphate in water, achieving remarkable results, improving water treatment efficiency, and mild adsorption treatment conditions

Inactive Publication Date: 2014-07-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Carbon nanotubes are modified by zirconia and applied to the adsorption and removal of phosphate, but there are no related reports so far.

Method used

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  • Method for adsorbing and removing phosphates from water body by using zirconium oxide modified carbon nano tubes
  • Method for adsorbing and removing phosphates from water body by using zirconium oxide modified carbon nano tubes
  • Method for adsorbing and removing phosphates from water body by using zirconium oxide modified carbon nano tubes

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Put 5.0 g of carbon nanotubes in a muffle furnace and burn at 300-350 °C for 1-1.5 h to remove amorphous carbon and graphite fragments attached to the surface of carbon nanotubes; after cooling to room temperature, add to 250 mL of 70 wt. % sodium hypochlorite solution, ultrasonically dispersed for 0.5-1 h, reflux reaction in a constant temperature water bath at 85 °C for 4-6 h to remove metal impurities contained in the carbon nanotubes, and finally washed to neutrality and vacuum-dried. Weigh 1.0 g of purified carbon nanotubes in a certain volume of 65.0-68.0% concentrated nitric acid solution, ultrasonically disperse for 0.5-1 h, then reflux in an oil bath at 110-140 °C for 8-12 h, wash with water and dry.

[0024] Disperse 100 mg of pretreated carbon nanotubes (denoted as MWNT-0) to 80 mL of a certain concentration (2 mmol L -1 , 4 mmol·L -1 , 10 mmol·L -1 ) in an aqueous solution of zirconium oxychloride, ultrasonically dispersed for 0.5-1 h, hydrothermally react...

Embodiment 2

[0027] The zirconia-modified carbon nanotube MWNT-Zr-10 (weighted average particle size: 4.91 nm) synthesized in Example 1 was used as an adsorbent to treat phosphate-containing water. Static adsorption was carried out in a 40 mL EPA bottle with tetrafluoroethylene gasket, the mass ratio of adsorbent to phosphate-containing water was 1:2000, pH=6.0±0.2, and the initial concentration of phosphate was 64.5 mg L -1 , the water does not contain NaCl and other coexisting anions, the adsorption temperature is 25°C, and the adsorption time is 24 h. After adsorption equilibrium, filter through a 45 μL aqueous filter head, and the phosphate concentration in the filtrate is measured at 700 nm by molybdenum blue colorimetry. The measured adsorption amount of phosphate (calculated as phosphorus, the same below) is 17.60 mg·g-1 , the adsorption capacity of phosphate after standardization by zirconia is 38.60 mg·g -1 ZrO 2 .

Embodiment 3

[0029] The operating conditions for adsorption removal are the same as in Example 2, the adsorbent is MWNT-Zr-4, its weighted average particle size is 3.74nm, and the phosphate adsorption capacity is 13.84 mg g -1 , the adsorption capacity of phosphate after standardization by zirconia is 54.06 mg·g -1 ZrO 2 .

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Abstract

The invention discloses a method for adsorbing and removing phosphate in water using zirconium oxide-modified carbon nanotubes. The pretreated carbon nanotubes are ultrasonically dispersed in a zirconium oxychloride solution, and a hydrothermal synthesis method is used to synthesize the carbon nanotubes. Modification of zirconium oxide is performed to prepare zirconium oxide-modified carbon nanotubes; the zirconium oxide-modified carbon nanotubes are added to the phosphate-containing water to adsorb and remove the phosphate in the water. This invention uses this material as an adsorbent for the first time and applies it to the treatment of phosphorus-containing water. The adsorbent shows good removal effect on phosphate, and the adsorbent is acid and alkali resistant, has short adsorption time, mild treatment conditions and high treatment efficiency. The invention has good economic and environmental benefits when applied to remove phosphate in water.

Description

technical field [0001] The invention belongs to the technical field of synthesis of inorganic materials and water treatment, and relates to a method for removing phosphate in water by an adsorption method, in particular to a method for removing phosphate in water by using zirconia-modified carbon nanotubes as an adsorbent . Background technique [0002] Phosphorus is a limiting nutrient element required for the growth of aquatic organisms. When its content is excessive, it will cause eutrophication of water bodies. The main sources of phosphorus in water bodies are divided into point sources and non-point sources, among which point sources are mainly domestic sewage and industrial wastewater discharged in a concentrated manner, and urban rainfall runoff discharged through drainage pipes, etc.; non-point sources are mainly urban garbage dumped illegally and industrial waste water. Waste, farmland surface runoff, manure and flushing water discharged from livestock and poultry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
Inventor 许昭怡宗恩敏万海勤郑寿荣魏丹万玉秋王文娟朱东强韩玉香周娟还中科彭渡
Owner NANJING UNIV
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