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Cadmium-arsenic absorbing material and preparing method and application thereof

An adsorption material and application technology, applied in the field of soil pollution remediation, can solve the problem that the simultaneous removal ability of arsenic and cationic metal pollutants is not considered, the simultaneous removal ability of cationic metal pollutants is not considered, and the adsorption material arsenic removal efficiency is poor. and other problems to achieve the effect of reducing the risk of secondary dissolution, improving the physical and chemical properties of soil, reducing safety risks and human health hazards

Active Publication Date: 2015-09-30
中科康成农业科技浙江有限公司
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Problems solved by technology

The document "Removal of As(V) from aqueous solutions by iron coated rice husk" proposes an iron modification method, which gradually forms simple moieties on the surface of biochar after mixing biochar with iron salt and adding strong alkali solution dropwise. Iron hydroxide precipitation, but the iron hydroxide precipitation formed by this simple acid-base titration has a low adsorption capacity for arsenic, which makes the removal efficiency of the final adsorption material for arsenic poor, and it is not used in the modification design process. The simultaneous removal of cationic metal pollutants is not considered, and the high iron loading will cause acidification of the adsorbent, which will inhibit the adsorption performance of the obtained adsorbent for cationic metal pollutants.
The literature "Preparation and characterization of a novel magnetic biochar for arsenic removal" and "Arsenate adsorption onto iron oxide amended rice husk char" proposed a variety of similar iron modification methods, by loading magnetite on the surface of biochar to achieve the The removal of arsenic in the polluted solution also does not take into account how to maintain the material's ability to simultaneously remove the arsenic and cationic metal pollutants that exist in combination; moreover, this magnetite-loaded biochar has strong magnetic properties. The literature is all about water pollution, and magnetism is helpful for the recovery of adsorption materials, but if this adsorption material is applied to the soil, it will have an impact on the magnetic environment of the soil
The patent (CN 104388094 A) proposes a restoration material that combines the environmental effects of biochar and zero-valent iron. Although the removal of arsenic and cadmium pollutants is considered at the same time, the zero-valent iron introduced has a strong reducing ability , will also have a certain impact on the soil environment; at the same time, its preparation process needs to involve reduction and emulsification processes, and there are many process steps

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  • Cadmium-arsenic absorbing material and preparing method and application thereof
  • Cadmium-arsenic absorbing material and preparing method and application thereof
  • Cadmium-arsenic absorbing material and preparing method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1 Preparation of different modified adsorption material samples and comparison of their adsorption properties

[0033] Collect rice straw, pulverize it with a particle size of <10cm, rapidly heat up to 500°C at a rate of 30°C / min under oxygen-limited conditions, thermally crack until complete carbonization, cool naturally to room temperature, and crush through a 10-mesh sieve to obtain the precursor of the adsorption material , and then mixed with ferric chloride solution at a solid-to-liquid ratio of 1g:40mL, wherein the mixed mass percentages of the adsorbent material precursor and iron are 100:0, 99:1, 49:1, 19:1, and 9:1 , stirred and mixed for 12 hours, then reacted at 120°C for 12 hours, cooled naturally to room temperature, washed with water to remove the residual free iron salt on the surface of the material, dried at 80°C, crushed through a 10-mesh sieve, and obtained five different cadmium and arsenic adsorption Material.

[0034] Wherein the mixed ...

Embodiment 2

[0040] Example 2 Adsorbent material C's removal ability test for cadmium and arsenic present in complex

[0041] The adsorption material C was analyzed by scanning electron microscopy, EDS energy spectrum scanning and XRD diffraction, see Figure 2A , 2B , 2C, 2D. 2A and 2B are the surface morphology maps of the adsorption material C. It can be found that iron particles are loaded on the surface of the carbon-based cadmium-arsenic adsorption material, and the size is about 1-5nm. At the same time, the results of 2C energy spectrum scanning also prove that the adsorption material C contains a certain amount of Fe element. Furthermore, multiple diffraction peaks related to the iron mineral goethite were also observed in the 2D XRD diffraction results.

[0042] The adsorption material C is evaluated for the removal ability of cadmium and arsenic in complex existence: by adding 10g / L adsorption material to the configured metal pollution solution (containing 100mg / L arsenate a...

Embodiment 3

[0043] Example 3 Adsorbent material B is tested for the removal capacity of cadmium and arsenic present in complex

[0044] The adsorption material B is evaluated for the removal ability of cadmium and arsenic in complex existence: add 10g / L adsorption material B to the polluted solution (containing 100mg / L arsenate and 100mg / L cadmium ions), and finally the adsorption material B has no effect on the removal of arsenic. The adsorption capacity reaches 4.0 mg / g, and the adsorption capacity for cadmium can also reach 6.6 mg / g, while the same dose of adsorption material A can only remove 0.8 mg / g arsenic and 10.4 mg / g cadmium at the same time, lacking the removal of arsenic capacity, the same dose of adsorption material D can only remove 8.0 mg / g arsenic and 3.3 mg / g cadmium at the same time, lacking the ability to remove cadmium; Adding 10g / L of adsorption material to the medium, the adsorption capacity of the adsorption material to arsenic can reach 5.8mg / g, and the adsorptio...

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Abstract

The invention discloses a cadmium-arsenic absorbing material and a preparing method and application thereof. The cadmium-arsenic absorbing material includes the steps that biomass is smashed and heated to 500 DEG C quickly under the limited oxygen or oxygen-free condition, then thermal cracking is conducted till the biomass is totally carbonized, the biomass is cooled naturally to the room temperature, smashing is conducted, and an absorbing material precursor is obtained; the absorbing material precursor is mixed with a ferric salt solution, a mixture of the absorbing material precursor and the ferric salt solution is prepared, the mixture is placed at the temperature of 110 DEG C to 150 DEG C to conduct reaction for 12 hours and then is cooled to the room temperature, dissociative ferric salt remaining on the surface of the material is washed out, and the cadmium-arsenic absorbing material is obtained after being dried at 80 DEG C. The cadmium-arsenic absorbing material and the preparing method and application can be used for absorbing cadmium and / or arsenic and restoring soil or water polluted by heavy metal; secondary pollution is avoided; the soil physicochemical property is improved; meanwhile, biomass waste is converted into a soil restoration material, the cadmium-arsenic absorbing material is low in cost and wide in source, and the soil restoration cost is lowered.

Description

technical field [0001] The invention relates to the field of soil pollution restoration, in particular to a cadmium and arsenic adsorption material, a preparation method and an application. Background technique [0002] With the rapid development of the economy, human activities have caused a large amount of pollutant discharge, and environmental problems have become increasingly prominent. Among them, soil heavy metal pollution is an important issue that people pay attention to. These heavy metal pollutants are absorbed by crops and transmitted through the food chain, which may further affect human health. At the same time, with rainfall / runoff, heavy metal pollution in soil will also migrate to surface water bodies and groundwater, and cause serious harm to the human body through drinking water intake and other ways. Therefore, remediation of heavy metal-contaminated soil has become a hot spot. However, metal pollutants in soil come from a wide variety of sources and can...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/62B09C1/00C02F1/58
Inventor 蔡超张又弛朱永官邢贞娇欧洁连
Owner 中科康成农业科技浙江有限公司
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