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Modified-nano-hydroxyapatite capable of effectively absorbing methylene blue dyes and preparation method and application of modified-nano-hydroxyapatite

A nano-hydroxyapatite and methylene blue dye technology, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water pollutants and other directions, can solve the problems of large discharge of printing and dyeing wastewater, high cost, and difficult biochemical treatment.

Inactive Publication Date: 2016-06-22
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Printing and dyeing wastewater containing methylene blue has a large amount of discharge, is highly polluting, and is difficult to treat with biochemical methods. Although the effect of activated carbon adsorption is better, it is expensive and difficult to promote

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  • Modified-nano-hydroxyapatite capable of effectively absorbing methylene blue dyes and preparation method and application of modified-nano-hydroxyapatite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The method for preparing modified nano-hydroxyapatite:

[0029] (1) Dissolve humic acid with 0.1mol / L sodium hydroxide solution or potassium hydroxide solution, adjust the pH value to 5.0 with 0.1mol / L hydrochloric acid, add water to form a 1000mg / L aqueous solution.

[0030] (2) Add nano-hydroxyapatite (particle size not exceeding 100nm) to the above aqueous solution to prepare a mixed solution with a mass concentration of nano-hydroxyapatite of 10 g / L, and stir or shake the mixed solution for 24 hours.

[0031] (3) centrifuging to remove the upper layer solution, and freeze-drying the lower layer solid to obtain humic acid-modified modified nano-hydroxyapatite.

[0032] Application of modified nano-hydroxyapatite to adsorb methylene blue:

[0033] Weigh 50 mg of modified nano-hydroxyapatite into a 150 mL Erlenmeyer flask, add 50 mL of methylene blue solution (pH=7.0) whose methylene blue concentration does not exceed 500 mg / L. Place the Erlenmeyer flask on a shaker ...

Embodiment 2

[0035] The method for preparing modified nano-hydroxyapatite:

[0036] (1) Dissolve humic acid with 0.1mol / L sodium hydroxide solution or potassium hydroxide solution, adjust the pH value to 5.0 with 0.1mol / L hydrochloric acid, add water to form a 2000mg / L aqueous solution.

[0037] (2) Add nano-hydroxyapatite (particle size not exceeding 100nm) to the above aqueous solution to prepare a mixed solution with a mass concentration of nano-hydroxyapatite of 10 g / L, and stir or shake the mixed solution for 24 hours.

[0038] (3) centrifuging to remove the upper layer solution, and freeze-drying the lower layer solid to obtain humic acid-modified modified nano-hydroxyapatite.

[0039] Application of modified nano-hydroxyapatite to adsorb methylene blue:

[0040] Weigh 50 mg of humic acid-modified nano-hydroxyapatite and place it in a 150 mL Erlenmeyer flask, add 50 mL of a methylene blue solution (pH=7.0) whose methylene blue concentration does not exceed 500 mg / L. Place the Erlenme...

Embodiment 3

[0042] The method for preparing modified nano-hydroxyapatite:

[0043] (1) Dissolve humic acid with 0.1mol / L sodium hydroxide solution or potassium hydroxide solution, adjust the pH value to 5.0 with 0.1mol / L hydrochloric acid, add water to form a 5000mg / L aqueous solution.

[0044] (2) Add nano-hydroxyapatite (particle size not exceeding 100nm) to the above aqueous solution to prepare a mixed solution with a mass concentration of nano-hydroxyapatite of 10 g / L, and stir or shake the mixed solution for 24 hours.

[0045] (3) centrifuging to remove the upper layer solution, and freeze-drying the lower layer solid to obtain humic acid-modified modified nano-hydroxyapatite.

[0046] Application of modified nano-hydroxyapatite to adsorb methylene blue:

[0047] Weigh 50 mg of modified nano-hydroxyapatite into a 150 mL Erlenmeyer flask, add 50 mL of methylene blue solution (pH=7.0) whose methylene blue concentration does not exceed 500 mg / L. Place the Erlenmeyer flask on a shaker ...

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Abstract

The invention relates to modified-nano-hydroxyapatite capable of effectively absorbing methylene blue dyes and a preparation method and application of the modified-nano-hydroxyapatite. The modified-nano-hydroxyapatite is prepared in the mode that natural macromolecular humic acid is combined to the surface of the nano-hydroxyapatite under the surface complexation coordination effect. The preparation process is simple in operation, and the prepared modified-nano-hydroxyapatite has good dispensability in water. The prepared modified-nano-hydroxyapatite has high capability of absorbing methylene blue in a water solution under the electrostatic interaction of humic acid and the synergistic effect of the huge specific surface area of the nano-hydroxyapatite and has wide applciation prospect in the field of dye wastewater treatment.

Description

[0001] This research was supported by the National Natural Science Foundation of China (No.41303081) and the Doctoral Discipline Fund of the Ministry of Education (New Teacher Category) (No.20133207120019). technical field [0002] The invention relates to a new material and its preparation method and application, in particular to a modified nano-hydroxyapatite modified by humic acid and its preparation method, which is applied to efficiently adsorb methylene blue dye in aqueous solution. Background technique [0003] In recent years, environmental problems caused by printing and dyeing wastewater pollution have become increasingly prominent. Most of the dyes have complex aromatic ring structures, are highly toxic and bioaccumulative, and are difficult to degrade under natural conditions. At present, the methods commonly used in the industry to treat printing and dyeing wastewater include coagulation, oxidation, biodegradation, adsorption and other methods. Compared with ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F101/38
CPCB01J20/22C02F1/285B01J20/24C02F2101/308B01J2220/4812
Inventor 魏巍施梦琦徐敏魏晟任琳琳邹彩瑜杨磊崔静魏正贵钟文辉李时银
Owner NANJING NORMAL UNIVERSITY
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