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Magnetic chaff charcoal for removing lead and cadmium in water and preparation and application method thereof

A technology of biochar and chaff, applied in chemical instruments and methods, water pollutants, alkali metal compounds, etc., can solve the problems of magnetization that have not been reported yet, and achieve the effect of simple operation

Inactive Publication Date: 2016-07-27
湖南德宝恒嘉环保生物科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic research on magnetic materials loaded on the surface of biochar is still in the initial stage. It is easier to realize magnetic loading on neutral or alkali-modified biochar materials. The reason is that magnetization needs to be carried out under alkaline conditions, while acid-modified There is no relevant report on the magnetization of permanent biochar materials. The present invention aims to develop an acid-modified biochar magnetic material, which is effective for Pb in water. 2+ and Cd 2+ It has a huge adsorption capacity, and can be quickly separated and recycled by magnetism, which is of great significance to the treatment of heavy metal wastewater in my country

Method used

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  • Magnetic chaff charcoal for removing lead and cadmium in water and preparation and application method thereof
  • Magnetic chaff charcoal for removing lead and cadmium in water and preparation and application method thereof
  • Magnetic chaff charcoal for removing lead and cadmium in water and preparation and application method thereof

Examples

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Effect test

Embodiment 1

[0033] 1. Preparation of magnetic chaff biochar (BC-300-Fe)

[0034] (1) Wash and dry the chaff raw materials, heat at 300°C for 6 hours under nitrogen, carbonize and crush through a 100-mesh sieve, wash with 0.005mol / L nitric acid at a solid-to-liquid ratio of 1:10 to remove ash, and use ultrapure water Wash until neutral, and dry at 70°C to obtain chaff biochar;

[0035] (2) Take a certain amount of carbonized chaff and place it in 2mol / L nitric acid at a solid-to-liquid ratio of 1:20, and oxidize it at 110°C for 1.5h, stirring occasionally during this period. After cooling, wash with distilled water until the pH of the supernatant is neutral, and dry to obtain acid-modified chaff biochar;

[0036] (3) A certain proportion of FeCl3 6H 2 O and FeCl 2 4H 2 O mixed and dissolved in 0.5mol / L HCl solution, added to 0.9mol / L ammonia solution to form black Fe 3 o 4 Colloidal precipitate. Add a certain amount of carbonized rice husk, stir for 30 minutes, stand for separation,...

Embodiment 2

[0045] 1. Preparation of magnetic chaff biochar (BC-400-Fe)

[0046] (1) Wash and dry the chaff raw materials, heat at 400°C for 4 hours under nitrogen, carbonize and crush through a 100-mesh sieve, wash with 0.007mol / L nitric acid at a solid-to-liquid ratio of 1:15 to remove ash, and use ultrapure water Wash until neutral, and dry at 70°C to obtain chaff biochar (BC-400);

[0047] (2) Take a certain amount of carbonized chaff and place it in 2mol / L nitric acid at a solid-to-liquid ratio of 1:10, and oxidize it at 110°C for 2 hours, stirring occasionally during this period. After cooling, wash with distilled water until the pH of the supernatant is neutral, and dry to obtain acid-modified chaff biochar (BC-400-HNO 3 );

[0048] (3) A certain proportion of FeCl 3 ·6H 2 O and FeCl 2 4H 2 O mixed and dissolved in 0.4mol / L HCl solution, added to 0.7mol / L ammonia solution to form black Fe 3 o 4 Colloidal precipitate. Add a certain amount of carbonized rice husk, stir for 3...

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Abstract

The invention discloses magnetic chaff charcoal for removing lead and cadmium in water and a preparation and application method thereof.The preparation method of the magnetic chaff charcoal includes the steps of (1) preparing chaff charcoal; (2) performing acid modification on the chaff charcoal, namely modifying the chaff charcoal through nitric acid to obtain acid-modified chaff charcoal; (3) and magnetizing the acid-modified chaff charcoal to obtain loaded nano Fe3O4 modified chaff charcoal particles (BC-Fe).The magnetic chaff charcoal can remove heavy metals in water, such as Pb and Cd, not only has high removal rate of heavy metals, but also is low in cost without secondary pollution.In addition, the magnetic chaff charcoal can be recycled and widely applied to the field of treatment of wastewater with heavy metals such as Pb and Cd.

Description

technical field [0001] The invention relates to the field of lead and cadmium pollution in water bodies, in particular to a magnetic chaff biochar for removing lead and cadmium in water bodies and a preparation and application method thereof. Background technique [0002] Heavy metal pollution has become a worldwide environmental problem. Toxic heavy metal elements such as lead (Pb) and cadmium (Cd) can enter animals and plants through air, water, soil, etc., and are difficult to degrade in the environment. They can be enriched and absorbed by aquatic animals and plants, endangering the aquatic ecological environment, and entering the food chain May endanger human and animal safety. In addition, direct drinking or skin contact with water containing toxic heavy metals can cause them to enter the human body and cause harm to human health. [0003] After excessive heavy metals enter the water body, they can change the fine structure of aquatic plant cells, inhibit the activit...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/20B01J20/30C02F1/28C02F101/20
CPCB01J20/0229B01J20/20B01J20/28009B01J2220/485B01J2220/4881C02F1/281C02F1/283C02F1/288C02F2101/20
Inventor 廖柏寒周航曹玮杜文琪鲍恒
Owner 湖南德宝恒嘉环保生物科技有限公司
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