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Sulfur-doped nano ferroferric oxide/biochar composite material as well as preparation method and application thereof

A technology of ferroferric oxide and composite materials, which is applied in the field of sulfur-doped nanometer ferroferric oxide/biochar composite materials and its preparation and application, can solve problems such as inability to solve remediation problems and difficult to achieve soil remediation goals, and achieve Maintain magnetic separation characteristics, efficiently adsorb heavy metals, and have a wide range of sources

Active Publication Date: 2020-11-13
EAST CHINA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] At present, nano-iron / biochar composite materials are widely used in the removal of heavy metal pollution in water and some organic pollutants and have achieved good results. However, there are relatively few reports on the application of this material to the remediation of heavy metal pollution in soil.
Although the above-mentioned methods can realize the simultaneous remediation of one or more heavy metal pollution in soil, most of them are aimed at the remediation of cationic metals, and it is difficult to achieve soil remediation for soils polluted by anionic metals or contaminated soils with both anionic and cationic metals. target, there are still some deficiencies, which cannot solve the practical repair problems in engineering applications

Method used

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  • Sulfur-doped nano ferroferric oxide/biochar composite material as well as preparation method and application thereof
  • Sulfur-doped nano ferroferric oxide/biochar composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: Preparation of sulfur-doped nano-ferric oxide / biochar composite material

[0041] Step 1: Wash the mung bean shell, the raw material of biomass, dry at 80° C. for 48 hours, and pass through a 10-mesh sieve after crushing. The processed mung bean shell raw material is put into a tube furnace, and oxygen is isolated under the protection of nitrogen. The temperature rise program is set at 15°C / min to raise the temperature to 700°C, and it is pyrolyzed at 700°C for 2 hours under oxygen-limited conditions, and finally cooled to obtain biochar.

[0042] Step 2: Grind the biochar obtained above, pass through a 100-mesh sieve, and set aside.

[0043] Step 3: ultrasonically disperse 60mmol of thiourea, 20mmol of ferric nitrate nonahydrate and an appropriate amount of biochar in 50mL of n-butylamine for 30min, respectively. First, mix thiourea and ferric nitrate nonahydrate solution in a 250mL three-necked flask, and react the mixed solution at 60°C for 30min under...

Embodiment 2

[0045] Embodiment 2: Preparation of sulfur-doped nano-ferric oxide / biochar composite material

[0046] Step 1: Dry the water hyacinth root powder at 80°C for 48h as a biomass raw material, put it into a tube furnace, set the temperature rise program at 15°C / min to raise the temperature to 700°C, pyrolyze it at 700°C for 2h under oxygen-limited conditions, and finally cool down to obtain biochar .

[0047] Step 2: Grind the biochar obtained above, pass through a 100-mesh sieve, and set aside.

[0048] Step 3: ultrasonically disperse 60 mmol of thiourea, 20 mmol of ferric nitrate nonahydrate and an appropriate amount of biochar in 50 mL of n-butylamine for 30 min, respectively. First, mix thiourea and ferric nitrate nonahydrate solution in a 250mL three-necked flask, and react the mixed solution at 60°C for 30min under the protection of continuous stirring and inert gas. Then the biochar suspension was added, and the reaction was continued for 2 h. After removing the heat sou...

Embodiment 3

[0050] Example 3: Determination of the removal performance of heavy metal arsenic and lead in soil by sulfur-doped nano-ferric oxide / biochar composite material

[0051] Soil remediation experiment (conducted in an air environment): Measure 10mL of deionized water and add it to an Erlenmeyer flask containing 2g of contaminated soil, shake well, then add 0.02g of the prepared sample, and shake in a water bath for 12h. Each sampling volume is 1ml, and after filtering through a 0.45 μm filter membrane, use an atomic absorption spectrophotometer and an atomic fluorescence spectrometer to measure the concentrations of Pb and As therein, and calculate the removal rate.

[0052] Figure 1a and Figure 1b Respectively, the sulfur-doped iron ferric oxide nanomaterials involved in Example 2 of the present invention remove arsenic and lead from soil. From Figure 1a and Figure 1b It can be seen that the removal rate of arsenic in soil to the sulfur-doped nano ferric oxide / biochar compo...

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Abstract

The invention discloses a sulfur-doped nano ferroferric oxide / biochar composite material, a preparation method thereof and application thereof in remediation of heavy metal arsenic and / or lead contaminated soil. The composite material is prepared by loading sulfur-doped nano ferroferric oxide on a biochar carrier, and biomass raw materials used for preparing the biochar carrier comprise agricultural waste. In the preparation process of the sulfur-doped nano ferroferric oxide / biochar composite material, solid loading and vulcanization modification are combined at the same time, so that the composite material has an efficient adsorption performance, reduction performance and recovery potential, and the purpose of efficiently removing arsenic and lead pollutants in soil at the same time can be achieved. According to the method, the limitation of solely using biochar or a nano-iron material is broken, the problem that arsenic existing in an anionic form and lead existing in a cationic formare difficult to remove efficiently at the same time in the actual soil remediation process is solved, and the composite material has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of modification materials for heavy metal polluted soil in environmental protection, in particular to a sulfur-doped nano ferric oxide / biochar composite material and its preparation method and its application in remediation of heavy metal arsenic and / or lead polluted soil . Background technique [0002] According to the data of the National Soil Pollution Survey Bulletin released by the Ministry of Environmental Protection and the Ministry of Land and Resources of the People's Republic of China in 2014, the national soil environment situation is not optimistic, and soil pollution is serious. The total national soil exceeding rate is 16.1%. According to data from the Eco-Environmental Research Center of the Chinese Academy of Sciences, nearly 20 million hectares of soil in my country are currently polluted by heavy metals such as Pb, As, and Hg, accounting for about 20% of the total cultivated land area. Amo...

Claims

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Application Information

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IPC IPC(8): C09K17/00B01J20/20B01J20/30B09C1/00
CPCB01J20/20B09C1/00C09K17/04
Inventor 张卫王戈慧桑丽卞浩李倩楠季晓雯曹心德付融冰楼紫阳邱宇平
Owner EAST CHINA UNIV OF SCI & TECH
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