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Modified biomass charcoal for treating arsenic pollution as well as preparation method and application of modified biomass charcoal

A biomass charcoal, biomass raw material technology, applied in the recovery of water pollutants, polluted soil, chemical instruments and methods, etc., can solve the problems of high energy consumption, cumbersome operation process, no cost saving, etc. The effect of short, wide adaptability and low application cost

Inactive Publication Date: 2016-09-21
INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has a certain control effect on arsenic and cadmium complex polluted soil, but the operation process of this method is relatively cumbersome, and it needs to continue high temperature above 500°C for 14 hours, and above 300°C for 27-55 hours, which consumes a lot of energy and does not save costs, and its corresponding products There are relatively many types of reagents involved in

Method used

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  • Modified biomass charcoal for treating arsenic pollution as well as preparation method and application of modified biomass charcoal
  • Modified biomass charcoal for treating arsenic pollution as well as preparation method and application of modified biomass charcoal
  • Modified biomass charcoal for treating arsenic pollution as well as preparation method and application of modified biomass charcoal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A preparation method of modified biochar, such asfigure 1 shown, including the following steps:

[0069] (1) Crush the straw and pass it through a 100-mesh sieve, and then carbonize it in a carbonization furnace at a temperature of 500°C for 6 hours, then cool it to 30°C to obtain biochar (such as figure 2 (a));

[0070] (2) React the solid-liquid ratio of 1g:10mL biochar with the concentration of 1mol / L hydrochloric acid solution under the condition of stirring speed of 120r / min, the reaction temperature is 30°C, and the reaction time is 12h. After the reaction, the solid liquid separation to obtain a solid substance, the solid substance was washed with distilled water until the pH value was neutral, press-filtered, the obtained solid substance was dried at 70°C, and crushed to 100 mesh to obtain pretreated biochar;

[0071] (3) Pretreated biochar with a solid-to-liquid ratio of 1g:10mL and FeCl with a concentration of 0.5mol / L 3 The solution was reacted for 24 hour...

Embodiment 2-4

[0074] Except that the wheat stalks in step (1) were replaced by cotton stalks, rice straws and corn stalks, the rest were the same as in Example 1, and modified cotton stalk charcoal, modified rice straw charcoal and modified corn stalk charcoal were respectively obtained.

[0075] The main chemical components of the biochar in Examples 1-4 before and after modification were analyzed, and the analysis results are shown in Table 1.

[0076] Table 1 The main chemical components and specific surface area of ​​biochar before and after modification

[0077]

[0078] Among them, "-" means no data.

[0079] It can be seen from Table 1 that compared with unmodified, the specific surface area of ​​the modified biochar increased by 8.15-30.3 times; the iron content increased greatly, and its mass percentage could reach 59.52%. The increase in the specific surface area means that The increase of adsorption sites and adsorption capacity, and the increase of iron content indicate that...

Embodiment 5

[0081] A preparation method of modified biochar, comprising the steps of:

[0082] (1) Wheat straw was crushed through a 100-mesh sieve, placed in a carbonization furnace at 500°C for 8 hours, and cooled to room temperature to prepare biochar;

[0083] (2) Add 400mL of hydrochloric acid solution with a concentration of 1mol / L to every 50g of biochar, stir and react for 12h, press filter, wash with distilled water for more than 3 times until the pH is neutral, and obtain a solid substance, which is dissolved in 80 °C drying and crushing, passing through a 100-mesh sieve to obtain pretreated biochar;

[0084] (3) Add 500 mL of FeCl with a concentration of 0.5 mol / L to 50 g of pretreated biochar 3 solution, adjust the pH to 7 with sodium hydroxide solution, stir at 30°C for 48 hours, press filter to obtain a mud cake;

[0085] (4) Dry the mud cake at 100°C for 12 hours, cool it to room temperature, smash it through a 100-mesh sieve, wash it with pure water until the effluent is...

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Abstract

The invention provides modified biomass charcoal for treating arsenic pollution as well as a preparation method and an application of the modified biomass charcoal. The preparation method of the modified biomass charcoal comprises steps as follows: (1) biomass raw materials are charred, and the biomass charcoal is obtained; (2) the biomass charcoal is subjected to a reaction with a hydrochloric acid solution, solid-liquid separation is performed, a solid substance is obtained, is washed till the pH is neutral and then is dried, and the pretreated biomass charcoal is obtained; (3) the pretreated biomass charcoal and a FeCl3 solution are subjected to a reaction under the condition that the solution pH is neutral, solid-liquid separation is performed after the reaction, and mud cake is obtained; (4) the mud cake is dried and then washed till the pH is neutral, solid-liquid separation is performed, an obtained solid is dried for a second time, and the modified biomass charcoal is obtained. The modified biomass charcoal has large specific surface area and high iron content; the preparation method is simple and easy to operate; the modified biomass charcoal can be applied to treatment of arsenic waste and passivation of arsenic in farmland soil, and food safety is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of environmental maintenance, and relates to a modified biochar for controlling arsenic pollution, its preparation method and application, and in particular to an iron-modified biochar prepared by using agricultural waste straw as a raw material, and its The preparation method and its use for removing arsenic in water and soil. Background technique [0002] Arsenic is a heavy metal-like element that widely exists in soil. If humans are exposed to arsenic-containing environment for a long time, it can cause skin ulcers, cancer, kidney disease, etc., causing serious damage to human health and ecological environment risks. Since the last century, there have been many incidents of arsenic pollution poisoning around the world, such as the United States, Spain, Bangladesh, India and other places, especially in some countries in Southeast Asia. The geological process has caused the arsenic content in the groundwat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B09C1/00C02F101/10
CPCB01J20/20B01J20/02B01J20/0229B01J20/04B09C1/00C02F1/281C02F1/288C02F2101/103
Inventor 李莲芳朱昌雄刘小诗耿兵李红娜吴翠霞刘雪田云龙李峰叶婧郭萍
Owner INST OF ENVIRONMENT & SUSTAINABLE DEV IN AGRI CHINESE ACADEMY OF AGRI SCI
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