Hiberarchy biomass carbon fiber/TiO2 photocatalytic degradation ammonia nitrogen material and preparation method thereof

A biomass charcoal, hierarchical structure technology, applied in physical/chemical process catalysts, chemical instruments and methods, water pollutants, etc. Efficient and rapid removal of ammonia nitrogen

Inactive Publication Date: 2018-12-28
EAST CHINA JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, for low-concentration ammonia nitrogen, biological treatment is more common; however, under the condition of high polluting ammonia nitrogen concentration, biological treatment is relatively harsh on cond

Method used

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  • Hiberarchy biomass carbon fiber/TiO2 photocatalytic degradation ammonia nitrogen material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Hierarchical Structure Biomass Carbon Fiber / TiO 2 The preparation method of photocatalytic degradation ammonia nitrogen material comprises the following steps:

[0033] a) Cut the waste cotton into pieces, add 100mL alkali solution to 40g of biomass raw material, add it to a sodium hydroxide solution with a mass fraction of 3wt%, stir it for 4 hours at 80°C, take it out and use deionized water Wash until neutral, tumble dry. Prepare 2wt% NaClO 2 solution and adjust the pH value to 4 with acetic acid, and disperse the above dried sample in NaClO 2 Bleach was carried out in the solution, stirred at 70°C for 5 hours, then washed with deionized water and ethanol until neutral, and dried in an oven at 70°C for 12 hours to obtain biomass fibers.

[0034] b) Place the biomass fiber in a tube furnace, raise the temperature up to 400°C at a rate of 5°C / min, calcinate for 2 h under the protection of nitrogen, and cool naturally to obtain the biomass carbon fiber.

[0035] c) ...

Embodiment 2

[0040] Hierarchical Structure Biomass Carbon Fiber / TiO 2 The preparation method of photocatalytic degradation ammonia nitrogen material comprises the following steps:

[0041]a) After cutting the waste cotton into pieces, add 50g of biomass raw material into 100mL alkali solution, add it into the sodium hydroxide solution with a mass fraction of 9wt%, stir it for 4 hours at 80°C, take it out and use deionized water Wash until neutral, tumble dry. Prepare 5wt% NaClO 2 solution and adjust the pH value to 4 with acetic acid, and disperse the above dried sample in NaClO 2 Bleaching was carried out in the solution, stirred at 70°C for 5 hours, then washed with deionized water and ethanol until neutral, and dried in an oven at 70°C for 12 hours to obtain biomass fibers.

[0042] b) Put the biomass fibers in a tube furnace, raise the temperature up to 500°C at a rate of 8°C / min, calcinate for 3 h under the protection of nitrogen, and cool naturally to obtain biomass carbon fibers....

Embodiment 3

[0048] Hierarchical Structure Biomass Carbon Fiber / TiO 2 The preparation method of photocatalytic degradation ammonia nitrogen material comprises the following steps:

[0049] a) After shredding hemp, add 60g of biomass raw material to 100mL alkali solution, add it to sodium hydroxide solution with a mass fraction of 5wt%, stir for 4 hours at 80°C, take it out and wash it with deionized water to neutral, tumble dry. Prepare 8wt% NaClO 2 solution and adjust the pH value to 4 with acetic acid, and disperse the above dried sample in NaClO 2 Bleaching was carried out in the solution, stirred at 70°C for 5 hours, then washed with deionized water and ethanol until neutral, and dried in an oven at 70°C for 12 hours to obtain biomass fibers.

[0050] b) Put the biomass fibers in a tube furnace, raise the temperature up to 600°C at a rate of 10°C / min, calcinate for 4 h under the protection of nitrogen, and cool naturally to obtain biomass carbon fibers.

[0051] c) Prepare the mixe...

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Abstract

The invention belongs to the technical field of composite material preparation, relates to a photocatalytic degradation ammonia nitrogen material, and in particular relates to a hiberarchy biomass carbon fiber/TiO2 photocatalytic degradation ammonia nitrogen material which consists of a biomass carbon fiber and hiberarchy TiO2 nanowires, wherein the biomass carbon fiber is prepared by extracting cellulose and carbonizing biomass as a raw material and has the diameter of 2-10mu m; the hiberarchy TiO2 nanowires are made through seed method hydrothermal in-situ growth, have the diameter of 100-200nm and have the length of 1-5mu m. The invention further discloses a preparation method of the material, and application of the material as a photocatalyst for removing ammonia nitrogen in water. Thepreparation process is controllable, the reaction conditions are simple, and with the combination of a high specific surface area of the biomass fiber and the photocatalytic performance of TiO2, thepurpose of effectively and rapidly removing ammonia nitrogen can be achieved. Removal of ammonia nitrogen wastewater is simulated through experiments, and results show that the removal rate is as highas 97.3% under radiation of ultraviolet rays, and reliable theoretical and practical support are provided for actual application.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to photocatalytic degradation of ammonia nitrogen materials, in particular to a hierarchical structure biomass carbon fiber / TiO 2 The photocatalytic degradation ammonia nitrogen material and the preparation method thereof are suitable for preparing the photocatalytic degradation ammonia nitrogen material in the water body. Background technique [0002] In recent years, due to excessive fertilization and unreasonable use of pesticides, a large amount of nitrogen elements have been input into rivers, rivers, and lakes, resulting in worsening water environment, especially eutrophication of water bodies has become more and more frequent, causing dissolved oxygen in water bodies to decrease and water quality to deteriorate. , thereby disrupting the ecological balance of the water body. Ammonia nitrogen treatment methods are divided into physical, biological and chem...

Claims

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Application Information

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IPC IPC(8): B01J21/18C02F1/32C02F101/16
CPCB01J21/18B01J35/004C02F1/32C02F2101/16
Inventor 胡锋平王敏邱风仙彭小明张涛胡玉瑛戴红玲罗文栋
Owner EAST CHINA JIAOTONG UNIVERSITY
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