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Preparation method and application of novel iron-based biochar

A biochar, iron-based technology, applied in application, fertilizer mixture, agriculture, etc., to achieve the effect of improving repair efficiency, enhancing treatment effect, and expanding application potential

Inactive Publication Date: 2016-07-13
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to provide a new type of iron-based biochar and its preparation method for improving the treatment effect of pollutants in soil, so as to solve the shortcomings of existing materials

Method used

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  • Preparation method and application of novel iron-based biochar
  • Preparation method and application of novel iron-based biochar
  • Preparation method and application of novel iron-based biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A novel iron-based biochar and a preparation method thereof. The material uses biochar as a carrier, and iron oxides and zero-valent iron are loaded on the surface. The specific preparation steps are as follows:

[0026] a. Preparation of biomass raw materials: Dry the biomass raw materials (including sawdust, wood shavings, branches, tree trunks, forestry waste woody products; straw, wheat straw, grain grass, corn stalks and other straws) at 70°C for 5 hours, and grind Machined into 1-20mm powder, ready for use.

[0027] b. Biomass raw material pretreatment: a certain amount of iron oxide (Fe 2 o 3 / Fe 3 o 4 ) is dissolved in the system of ethanol and water (V (alcohol): V (water) = 7: 3), mixed evenly with an appropriate amount of the above-mentioned powdery biomass raw materials, and soaked under ultrasonic conditions for 1 to 5 hours; then low temperature (60 ° C ) heating to remove the solvent and drying, loading the precipitated iron oxide on the surface of th...

Embodiment 2

[0031] The novel iron-based biochar prepared by the present invention is tested for the removal rate of dichlorobiphenyl in soil. Weigh 7 contaminated simulated soil samples with a mass of 2.0g (initial concentration 500ug / kg), add 0.1g of new iron-based biochar, adjust the humidity with 2ml of ultra-pure water, and place them indoors in a place where there is no direct sunlight , keep the room temperature at 20°C, filter at the reaction time of 1h, 2h, 3h, 5h, 12h, 24h and 36h, and put the filter residue in a freeze dryer to dry. After it is completely dry, grind and sieve it, weigh 1.0g of soil sample into a 50ml centrifuge tube, add 1.5g of anhydrous sodium sulfate to it to remove water, and then add 20ml of n-hexane-acetone mixed solution (volume ratio is 1:1) , carried out microwave extraction for 40 minutes, centrifuged after the extraction was completed, took the supernatant and carried out rotary evaporation, evaporated to 1ml, and carried out analysis on the machine. ...

Embodiment 3

[0033] The novel iron-based biochar prepared by the present invention was tested for the removal rate of heavy metal arsenic. Take 150ml of 2mg / L arsenic solution, add 0.3g of new iron-based biochar, divide into three groups of parallel experiments, put it in a constant temperature shaking box at 30°C for reaction, and take samples at regular intervals to measure the removal rate of heavy metal arsenic in water , to obtain the heavy metal removal curve of the material. From image 3It can be seen that: the material prepared by the present invention has a good removal effect on acid brilliant blue, and the reaction is rapid, and the removal rate of nearly 80% can be achieved after 30 minutes.

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Abstract

The invention relates to the field of preparation and application of novel iron-based biochar, in particular to a preparation method for a novel iron-based biochar repair material which is used for treating polluted soil. The preparation method is characterized by comprising the following steps: performing anaerobic dry distillation on a biomass raw material which is carried with an iron oxide in a dry distillation furnace; performing reducing, cracking and polymerizing reactions on the biomass to generate energy conversion; separating reductive gases, namely CO and H2; under a proper temperature, gradually reducing part iron oxide which is loaded on the surface of the biomass into zero-valent iron. Electrode potential difference exists between iron and carbon, so that a micro primary cell can be formed in soil solution; moreover, the iron oxide which remains on the surface of the biochar has a very good removal capacity to arsenic, so that the treatment effect on the pollutants in soil is enhanced very well; according to the preparation method and the application of the novel iron-based biochar, environmental effects of the biochar, the zero-valent iron and the iron oxide are combined, so that the problem of repair function loss of the biochar is solved; the repair efficiency is improved; the application potential of the novel iron-based biochar in the aspect of soil body pollution control is expanded.

Description

technical field [0001] The invention relates to the preparation and application field of a novel iron-based biochar, in particular to a preparation method of a novel iron-based biochar restoration material for contaminated soil treatment. Background technique [0002] Soil is the material basis for agricultural production and human survival. However, soil pollution has become one of the most urgent environmental problems in the world. In China, where the per capita arable land is lower than the world average, the problem of soil pollution is more prominent. In 2014 In April, the relevant ministries and commissions of the country issued the "National Soil Pollution Survey Bulletin", showing that the total soil exceeding the standard rate in the country has reached 16.1%, the area of ​​agricultural land polluted by heavy metals is about 25 million square meters, and the production of grain due to heavy metal pollution has been reduced by more than 10 million tons. , with a tot...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
CPCC05D9/00C05G3/80C05D9/02Y02P20/133
Inventor 林爱军徐从斌焦春磊邹德勋徐培发
Owner BEIJING UNIV OF CHEM TECH
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