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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

Pending Publication Date: 2020-04-10
中科元和环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, the technical problem to be solved in the present invention is to overcome the defect of low efficiency of removing hexavalent chromium by iron-containing substances in the prior art, thereby providing a kind of iron-modified biochar particles related to the efficient removal of hexavalent chromium in groundwater, The iron-modified biochar particles are doped with Fe 0 , Fe 2+ and γ-Fe 2 o 3 and other iron-containing oxides, where Fe 0 and Fe 2+ Effectively improve the reducing ability of biochar, and γ-Fe 2 o 3 Plays a key role in the adsorption of hexavalent chromium

Method used

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

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preparation example Construction

[0032] Such as figure 2 As shown, the invention provides a kind of preparation method of iron-modified biochar particles, comprising the following steps:

[0033] Put the biomass material at a concentration of 0.5mol L -1 After soaking in the soluble iron salt solution for 1.5-3 days, take out the soaked biomass material, dry it at 45-80°C, and crack it at 700-900°C for 2 hours;

[0034] Wherein the mass ratio of the iron element in the biomass to the soluble iron salt is (3-7):1, preferably 5:1.

[0035] The invention prepares the iron-modified biochar particles with a specific surface area of ​​400-700m 2 g -1 .

[0036]The soluble iron salt is one or a mixture of ferric chloride, ferrous sulfate or ferric nitrate.

[0037] The biomass material is tree plant, preferably poplar and / or willow.

[0038] An iron-modified biochar particle prepared by the method is characterized in that, the particle size is 0.5-2mm, and the iron-modified biochar is doped with Fe 0 , Fe 2...

Embodiment 1

[0042] Such as figure 2 As shown, the embodiment of the present invention provides a method for preparing iron-modified biochar particles, comprising the following steps:

[0043] Step S11, prepare ferric chloride solution: weigh a certain amount of ferric chloride solid and dissolve it in ultrapure water, add a small amount of hydrochloric acid to prevent the precipitation of ferric iron, stir it with a glass rod until it is completely dissolved, then put it into a volumetric flask to constant volume , dubbed molar concentration of 0.5mol L -1 ferric chloride solution;

[0044] Step S12, preparing biomass: After crushing the biomass poplar, select particles with a particle size of 0.5-2mm, and dry them at 60°C.

[0045] Step S13, preparing iron-modified biomass: the above 0.5mol L -1 Mix and soak the ferric chloride solution and biomass according to the mass ratio of biomass and iron 5:1. During the soaking process, stir with a glass rod to make the biomass fully absorb t...

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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.

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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Application Information

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IPC IPC(8): C02F1/28C02F1/70C02F101/22
CPCC02F1/281C02F1/283C02F1/70C02F1/705C02F2101/22
Inventor 刘鹏侯巧玲赵晶
Owner 中科元和环保科技有限公司
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