Iron-modified biochar particle as well as preparation method and application thereof

A biochar and particle technology, applied in chemical instruments and methods, water pollutants, adsorbed water/sewage treatment, etc., can solve the problems of low efficiency of hexavalent chromium, and achieve low production cost, good removal effect, and simple synthesis. Effect
CN110980862APending Publication Date: 2020-04-10中科元和环保科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
中科元和环保科技有限公司
Publication Date
2020-04-10

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Abstract

The invention discloses an iron-modified biochar particle as well as a preparation method and an application thereof. The preparation method comprises the steps: placing a biomass material in a soluble ferric salt solution with the concentration of 0.5 mol*L<-1>, soaking for 1.5-3 days, taking out the soaked biomass material, drying at the temperature of 45-80 DEG C, and cracking at the temperature of 700-900 DEG C for 2 hours. A filling material of a permeable reactive barrier integrates the characteristics of high specific surface area and high porosity of biochar and the reducing capacity of iron, hexavalent chromium is reduced into trivalent chromium with relatively low toxicity through a reduction effect in underground water, and then the trivalent chromium is fixed through an adsorption effect and a complexing effect; the filling material of the permeable reactive barrier has good permeability, can efficiently remove hexavalent chromium for a long time in acidic and weakly alkaline environments, and is wide in raw material source, low in manufacturing cost and simple and convenient to synthesize.
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Description

technical field

[0001] The present invention relates to the field of remediation of polluted groundwater, in particular, to an iron-modified biochar particle that can efficiently remove hexavalent chromium in groundwater; Biochar particle filling material; further, the present invention is also filled with the permeable reaction wall of the filling material. Background technique

[0002] Toxic heavy metal pollution in groundwater has become a major environmental problem. Among them, chromium is a common groundwater pollutant, mainly produced in metal plating, metal finishing, steel factory manufacturing, chromite mining, leather tanning and pigment synthesis, etc. in industrial activities. Due to improper disposal of chromium-containing waste, a large amount of chromium ions enter the underground aquifer through leaching and seepage, causing serious pollution of groundwater. Therefore, the remediation of chromium-contaminated groundwater is urgent.

[0003] Permeable reac...

Claims

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