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Preparation and application of chitosan-stabilized ferrous sulfide composite biochar material

A technology of ferrous sulfide and biochar, applied in the field of environmental restoration, can solve problems such as dioxins that cannot meet the emission standards and environmental threats

Inactive Publication Date: 2021-05-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pyrolysis method has relatively good adaptability, but the dioxins in the exhaust gas cannot meet the discharge standards, which poses a great threat to the environment

Method used

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  • Preparation and application of chitosan-stabilized ferrous sulfide composite biochar material
  • Preparation and application of chitosan-stabilized ferrous sulfide composite biochar material
  • Preparation and application of chitosan-stabilized ferrous sulfide composite biochar material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: material preparation

[0029] 1) Preparation of biochar: crush the cleaned and dried highland barley stalks, pass through a 40-mesh standard sieve for later use. Measure 50mL of 98% concentrated sulfuric acid into a 250mL round bottom flask, add 65g of highland barley straw powder, add 1.3g of asphalt, raise the temperature to 200°C, keep it for 2h, after cooling to room temperature, add deionized water, and stir for 15min Filtrate, wash and filter repeatedly until the filter residue has a pH value of 7, put it in a vacuum drying oven, set the temperature at 150°C, dry for 16 hours, and pass through a 100-mesh standard sieve to obtain biochar.

[0030] 2) Preparation of FeS: Weigh 3.1591g FeSO 4 ·7H 2 O was dissolved in 50mL of deionized water, stirred on a magnetic stirrer for 30min, and weighed 2.7273gNa 2 S·9H 2 O was dissolved in 30mL of deionized water, sonicated with an ultrasonic cleaner for 15min to make it completely dissolved, then transferre...

Embodiment 2

[0033] Example 2: Comparative experiment on the effect of different materials to remove Cr(Ⅵ)

[0034] Weigh 0.1g of biochar, FeS, FeS-chitosan, and FeS-chitosan-biochar, respectively, and add them to 50mL of simulated wastewater with an initial chromium concentration of 100mg / L, seal and place in a water bath with a constant temperature of 25°C In the shaker, samples were taken for analysis after 24 hours of reaction, and the experiment was set up for parallel experiments. The comparison of the removal rate obtained by analysis and calculation is as followsfigure 1 shown.

Embodiment 3

[0035] Example 3: Experiment of the Cr(Ⅵ) removal rate of FeS-chitosan-biochar as a function of time

[0036] Weigh 0.1 g of FeS-chitosan-biochar, add it to 50 mL of simulated wastewater with an initial chromium concentration of 100 mg / L, seal it and place it in a constant temperature 25°C water bath shaker, and react at 10, 20, 30, After 60, 90, 120, 180, 360, 540, 720, and 1440 minutes, samples were taken for analysis, and the experiments were set up for parallel experiments. The removal rate obtained by analysis and calculation changes with time as figure 2 shown.

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PUM

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Abstract

The invention relates to the field of environmental restoration, in particular to preparation and application of a chitosan-stabilized ferrous sulfide composite biochar material. The highland barley crop straw in the plateau area is used as a biochar raw material, and chitosan is used as a stabilizer of ferrous sulfide, so that the stability of the ferrous sulfide is improved, the ferrous sulfide is more uniformly loaded on the biochar, and the treatment effect on hexavalent chromium is enhanced. The invention provides an efficient, green and environment-friendly environmental remediation material, not only overcomes the defect that nano ferrous sulfide is easy to agglomerate, but also realizes resource utilization, effectively improves the removal efficiency of pollutants, and does not cause secondary pollution.

Description

technical field [0001] The invention relates to the field of environmental restoration, in particular to the preparation and application of a chitosan-stabilized ferrous sulfide composite biochar material. Background technique [0002] Chromium is a common heavy metal in surface water and groundwater, usually from various industrial processes such as metallurgy, chromate manufacturing, textile dyeing, tanning, wood preservation, and metal plating, among others. Due to its carcinogenicity, persistence and bioaccumulation, it may pose a high risk to ecosystems and public health. Generally, chromium exists in the natural environment as trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). Cr(III) is less toxic and usually exists in the form of precipitates, namely Cr(OH) 3 and Cr 2 o 3 , compared with Cr(III), Cr(VI) is highly toxic, usually soluble, easy to migrate, and exists in the form of oxyanions (CrO 4 2- , HCrO 4 - , Cr 2 o 7 2- ). In China, Cr(Ⅵ) i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70C02F101/22
CPCC02F1/283C02F1/70C02F2101/22
Inventor 林爱军秦璐瑶魏文侠何理杨文杰
Owner BEIJING UNIV OF CHEM TECH
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