Method for preparing nanometer iron-loaded amine-modified bio-char and application thereof

An amino-modified, biological carbon technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of improving surface characteristics and stability, improving surface properties, and increasing adsorption capacity

Inactive Publication Date: 2016-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the agglomeration problem of nano-zero-valent iron itself, it will greatly reduce its removal performance for pollutants.
In recent years, engineers and technicians have loaded nano-iron on porous materials, but most of these patents are based on activated carbon, which is limited by factors such as output and price, and it is difficult to achieve large-scale production and application.
Although a small number of patents use biochar as the matrix, they have not been modified on the surface before loading nano-iron, which restricts the further improvement of the adsorption capacity of the material.

Method used

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  • Method for preparing nanometer iron-loaded amine-modified bio-char and application thereof
  • Method for preparing nanometer iron-loaded amine-modified bio-char and application thereof
  • Method for preparing nanometer iron-loaded amine-modified bio-char and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Nano-iron-loaded amino-modified biochar, its preparation and application process are as follows:

[0030] (1) Freeze-dry 2 kg of water hyacinth bulbs, crush them, put them in a tube furnace, pass nitrogen gas for 10 minutes, flow rate is 0.5L / min, and rapidly raise the temperature, and keep constant temperature for 5 hours after reaching 350°C to obtain water hyacinth biochar;

[0031] (2) Take 10g of water hyacinth biochar and place it in 1mol / L dilute hydrochloric acid, stir at constant temperature to remove ash, and filter to obtain a solid; take 5g of solid, add a mixed solution of 50ml concentrated sulfuric acid and 50ml concentrated nitric acid in a volume ratio, and then mechanically stir the reaction 4 hour, suction filtration, cleaning and drying;

[0032] (3) Add the dried product in step (2) to 15 mL of ammonia water, mechanically stir for 15 minutes, add 25 g of sodium dithionite, stir at a constant speed for 24 hours, filter, wash and dry to obtain amino-mo...

Embodiment 2

[0036] The preparation and application process of nano-iron loaded amino-modified bio-carbon is as follows:

[0037] (1) 4 kg of water hyacinth bulbs were freeze-dried and pulverized, placed in a tube furnace, fed with nitrogen for 15 minutes, with a flow rate of 0.7 L / min, and rapidly heated up to 375°C and kept at a constant temperature for 5.5 hours to obtain water hyacinth biochar;

[0038] (2) Take 10g of water hyacinth biochar and place it in 0.5mol / L dilute hydrochloric acid, stir at constant temperature to remove ash, and filter to obtain a solid; take 5g of solid, add a mixed solution of 50ml concentrated sulfuric acid and 60ml concentrated nitric acid in a volume ratio, and then mechanically stir the reaction 4 hours, suction filtration, cleaning and drying;

[0039] (3) Add the dried product in step (2) to 18 mL of ammonia water, stir mechanically for 30 minutes, add 28 g of sodium dithionite, stir at a constant speed for 24 hours, filter, wash and dry to obtain ami...

Embodiment 3

[0043] The preparation and application process of nano-iron loaded amino-modified bio-carbon is as follows:

[0044] (1) 6 kg of water hyacinth bulbs were freeze-dried and pulverized, placed in a tube furnace, ventilated with nitrogen for 20 minutes, with a flow rate of 0.8 L / min, and rapidly raised the temperature to 400°C and kept at a constant temperature for 6 hours to obtain water hyacinth biochar;

[0045] (2) Take 10g of water hyacinth biochar and place it in 0.8mol / L dilute hydrochloric acid, stir at constant temperature to remove ash, and filter to obtain a solid; take 5g of solid, add a mixed solution of 50ml concentrated sulfuric acid and 55ml concentrated nitric acid in a volume ratio, and then mechanically stir the reaction 4 hours, suction filtration, cleaning and drying;

[0046] (3) Add the dried product in step (2) to 20 mL of ammonia water, mechanically stir for 40 minutes, add 30 g of sodium dithionite, stir at a constant speed for 24 hours, filter, wash and...

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Abstract

The invention relates to the preparation and application of nano-iron-loaded amino-modified biological carbon. In this method, the biochar treated with deashing is used as the substrate, and its surface characteristics and reactivity are improved through amino modification; the nano-iron produced by the reaction is fully and uniformly loaded on the amino-modified bio-char, and the obtained nano-iron Amino-loaded modified biochar has stable properties, is not easy to agglomerate, and has a greatly increased adsorption capacity. Applying it to the degradation of heavy metal Cd can significantly reduce the problem of activity reduction caused by the agglomeration effect of nano-iron itself. The adsorption effect of biochar and the reduction effect of nano-iron are exerted, and the treatment effect is significantly enhanced.

Description

technical field [0001] The invention belongs to the field of nano-biological carbon environmental functional materials and heavy metal pollution control, and in particular relates to a preparation method and application of nano-iron-loaded amino-modified biological carbon. Background technique [0002] Heavy metal pollution in water is an increasingly serious environmental problem. Heavy metals are highly toxic, persistent and non-biodegradable, and can easily become a major threat to human health through the enrichment of food chains. [0003] As a new type of environmental functional material, biochar has the characteristics of wide source of raw materials, simple preparation method, and high adsorption capacity. At the same time, biochar is also a good way to utilize waste. For example, water hyacinth biochar prepared from water hyacinth as a raw material provides a new way to control flooded water hyacinth. However, the biochar prepared from natural materials has the di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/70C02F101/20
CPCB01J20/20B01J20/0229B01J2220/4843C02F1/281C02F1/705C02F2101/20
Inventor 利锋沈凯旋谢晓杰
Owner SOUTH CHINA UNIV OF TECH
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