Preparation method of biological activated carbon capable of safely adsorbing cadmium in water

A biochar and water body technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of secondary pollution cost and low adsorption efficiency, so as to prevent secondary pollution and avoid The use of organic alkoxides and the effect of cumbersome operation steps

Active Publication Date: 2015-04-29
ZHEJIANG UNIV
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Problems solved by technology

The invention overcomes the three major problems of low adsorption efficiency, easy secondary pollution and high cost in the process of treating heavy metal sewage by the existing adsorption technology

Method used

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  • Preparation method of biological activated carbon capable of safely adsorbing cadmium in water
  • Preparation method of biological activated carbon capable of safely adsorbing cadmium in water
  • Preparation method of biological activated carbon capable of safely adsorbing cadmium in water

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Embodiment 1

[0042] Embodiment 1, the preparation method of biochar, carry out following steps successively:

[0043] Put the harvested elephant grass in a ventilated environment to dry naturally for a week (at this time, the moisture content is 12%), chop, grind into powder with a particle size of ≤10mm, and then put it into an oven for drying at 105°C for 3 hours; Then put it into the carbonization furnace, feed nitrogen, and raise the temperature to 500°C at a rate of 5°C / min to carry out the carbonization reaction with oxygen barrier, and feed nitrogen gas during the process of carbonization with oxygen barrier to maintain the pressure in the carbonization furnace chamber at 0.05Mpa ; Insulation reaction for 2 hours; then cooled to room temperature, and the granular product was crushed through a 60-100 mesh sieve to obtain powdered biochar (hereinafter referred to as biochar powder).

[0044] The yield of biochar powder (BC500) obtained in this embodiment is 38.72%, and its specific su...

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Abstract

The invention discloses a preparation method of biological activated carbon capable of safely adsorbing cadmium in water. The preparation method of the biological activated carbon capable of safely adsorbing cadmium in the water comprises the following steps: 1) removing impurities from harvested napiergrass, carrying out air drying, and then sequentially smashing and drying; 2) putting smashed and dried napiergrass into a carbonization furnace, heating to 480-520 DEG C at a rate of 4-6 DEG C/min, and carrying out oxygen-free carbonization reaction for 1.8-2.2 hours while heat preservation is carried out; and 3) cooling the carbonized napiergrass obtained in the step 2) to room temperature, smashing, and sieving, so that the biological activated carbon capable of safely adsorbing cadmium in the water is obtained. The preparation method of the biological activated carbon capable of safely adsorbing cadmium in the water has the advantages that the three problems that the adsorption efficiency is low, secondary pollution can be easily caused and cost is high when the existing adsorption technology is used for treating heavy metal wastewater are solved; meanwhile, carbon in plant waste is stably stored, carbon dioxide release is reduced, and obvious ecological benefit is realized.

Description

technical field [0001] The invention relates to the preparation of a biochar material, which belongs to the technical field of utilization of biomass resources. In particular, it relates to a biochar material capable of safely adsorbing cadmium in water bodies and a preparation method thereof. Background technique [0002] With the rapid development of today's industrial and agricultural production, heavy metals enter water bodies through various channels such as mining, metal smelting, chemical production wastewater, the use of pesticides and fertilizers, and domestic garbage, resulting in increasingly serious water heavy metal pollution. In addition, heavy metal pollution also has the characteristics of concealment, long-term and irreversibility, and can enter the human body through the food chain and endanger human life and health. This makes heavy metal pollution in water a social problem that needs to be solved urgently. Among them, cadmium pollution has been highly co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62
CPCB01J20/20B01J2220/485C02F1/281Y02C20/40
Inventor 杨肖娥崔孝强冯英张长宽杨倩颖戴曦
Owner ZHEJIANG UNIV
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