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Preparation method of magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation

A technology of composite pollution and adsorption materials, which is applied in the field of preparation of magnetic biochar adsorption materials, can solve problems such as difficult separation and poor arsenic adsorption capacity, and achieve the effect of simple preparation process, low cost, and realization of arsenic and cadmium composite pollution repair

Active Publication Date: 2017-05-31
ZHEJIANG UNIV
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Problems solved by technology

[0021] The technical problem to be solved by the present invention is to provide a method for preparing a magnetic biochar adsorption material for repairing arsenic and cadmium composite pollution. The present invention can overcome the disadvantages of poor arsenic adsorption capacity and difficult separation of existing biochar adsorption materials

Method used

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  • Preparation method of magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation
  • Preparation method of magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation
  • Preparation method of magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation

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Embodiment 1

[0044] Embodiment 1, a kind of preparation method of magnetic biochar adsorption material, carries out following steps successively:

[0045] 1), drying the rice straw to a moisture content of ≤10%, and then pulverizing it until it can pass through a 20-mesh sieve, as biomass;

[0046]2), weigh 11.12g (0.04mol) FeSO 4 ·7H 2 O and 21.64g (0.08mol) FeCl 3 ·6H 2 O was placed in a 1L three-necked flask and dissolved in 400mL deionized water to prepare a mixed solution of 0.1mol / L ferrous iron and 0.2mol / L ferric iron-iron salt solution, and add 5mol / L NaOH under stirring Adjust the pH of the iron salt solution to 11-12; add 20 g of the biomass obtained in step 1), heat and stir in a water bath at 60° C. for 2 hours, and finally cover the beaker with plastic wrap and let stand for 24 hours.

[0047] 3) The product obtained in step 2) is subjected to suction filtration, and vacuum-dried at 500-1500 Pa and 50°C for 24 hours; a dried solid is obtained.

[0048] Add calcium carbon...

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Abstract

The invention discloses a preparation method of a magnetic biochar adsorbing material for arsenic-cadmium combined pollution remediation. The preparation method comprises the following steps: 1) drying and smashing plant straw as biomass; 2) dissolving ferrous compound and ferric compound into water to obtain ferric salt solution according to a molar ratio of ferric ion to ferrous iron as (1.8 to 2.2) to 1; firstly adjusting a pH value of the ferric salt solution to 11 to 12, then adding the biomass obtained in the step 1), stirring at temperature of 60 + / - 10 DEG C for 2 + / -0.5 hours and finally standing for 22 to 26 hours under a sealed condition, wherein solid-fluid weight ratio of the biomass to the ferric salt solution is 4.5 to 5.5%; 3) drying solid obtained in the step 2), adding calcium carbonate powder of 0.8 to 1.2% of the weight of dried solid and pyrolyzing in 400 + / - 50 DEG C for 2 + / - 0.5 hours under inert gas atmosphere to obtain the magnetic biochar material.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a preparation method of a magnetic biochar adsorption material for repairing arsenic and cadmium composite pollution. Background technique [0002] The rapid development of industrial and agricultural modernization has caused serious heavy metal pollution in water. Heavy metals are difficult to degrade and volatilize, and can be enriched through the food chain, eventually threatening human life. Among the many heavy metals that pollute the environment, cadmium (Cd) has the strongest accumulation and toxicity in organisms. Inorganic As(III) and As(V) are the main forms of arsenic in water. Among them, inorganic arsenic(III) is the most toxic. Long-term exposure to arsenic can cause serious diseases such as skin cancer and lung cancer. Therefore, it is an urgent task for environmental protection workers to find a repair material with strong repair ability, stable effect an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F101/20
CPCB01J20/20B01J20/28009B01J2220/4825C02F1/281C02F2101/103C02F2101/20
Inventor 徐建明吴骥子刘杏梅
Owner ZHEJIANG UNIV
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