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Sulfur-based intercalated hydrotalcite modified charcoal-based adsorption material and preparation and application thereof

An adsorption material, biochar technology, applied in water pollutants, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of small adsorption of yin and yang HMs ions, increased hydrotalcite loading, and poor adsorption performance. Achieve broad industrial application prospects, improve load stability, and enhance the effect of stability

Pending Publication Date: 2022-02-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the present invention provides a sulfur-based intercalated hydrotalcite-modified biochar-based adsorption material, its preparation and application, loading hydrotalcite on the surface of the hydrophobic and porous biochar material, and increasing the water content by hydrothermal method. The loading capacity of talc on biochar, while passing through S 2- The method of anion intercalation improves the adsorption capacity of materials for anions, ensures the coordinated adsorption of anion and cation pollutants, and solves the problem of poor adsorption performance of heavy metal ions by heavy metal adsorbents in the prior art. Technical problems such as collaborative repair

Method used

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  • Sulfur-based intercalated hydrotalcite modified charcoal-based adsorption material and preparation and application thereof
  • Sulfur-based intercalated hydrotalcite modified charcoal-based adsorption material and preparation and application thereof
  • Sulfur-based intercalated hydrotalcite modified charcoal-based adsorption material and preparation and application thereof

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preparation example Construction

[0043] The preparation method of the biochar-based adsorption material modified by a kind of sulfur-based intercalation hydrotalcite provided by the invention, such as figure 1 shown, including the following steps:

[0044] (1) After the biomass raw material is impregnated with an alkaline solution, it is placed in a non-oxygen atmosphere and pyrolytically carbonized to prepare an activated biochar material;

[0045] (2) The activated biochar material obtained in step (1) is mixed with a metal salt and an alkaline buffer to perform a hydrothermal reaction to obtain a biochar-based hydrotalcite material; the metal salt includes at least one divalent metal salt and a trivalent metal salt;

[0046] (3) The biochar-based hydrotalcite material obtained in step (2) is calcined at a high temperature so that its interlayer anions are removed in the form of carbon dioxide, and then placed in a sulfur-based intercalation solution to realize the hydrotalcite interlayer anions Intercala...

Embodiment 1

[0072] The preparation method of the biochar-based adsorption material modified by sulfur-based intercalation hydrotalcite in this embodiment is specifically carried out according to the following steps:

[0073] (a) Preparation of activated biochar materials by alkaline solution impregnation pyrolysis. Wash the selected bamboo chips with alcohol, dry them in an oven at a temperature of 70°C for 24 hours, take them out and cool them, and crush them through a 100-mesh sieve; then select 10 g of the above-mentioned biomass powder and stir in 100 mL of 2mol / L KOH solution Soak for 8-24 hours and dry to constant weight to get KOH-activated biochar;

[0074] (b) Hydrotalcite was loaded on the surface of biochar material by urea hydrothermal method. Select 15g of the above biochar, and metal salt (0.04mol Mg(NO 3 ) 2 , 0.02mol Al(NO 3 ) 3 ) together in 200ml of alkaline buffer solution, magnetically stirred for 2h, the alkaline buffer solution is prepared from 0.2mol urea, 0.04...

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Abstract

The invention belongs to the technical field of wastewater treatment and soil remediation, and particularly relates to a sulfur-based intercalated hydrotalcite modified charcoal-based adsorption material and preparation and application thereof. The preparation method comprises the following steps: dipping a biomass raw material in an alkali liquor, carrying out pyrolysis carbonization to obtain an activated biochar material, carrying out hydrotalcite loading under a hydrothermal condition by taking the biochar material as a substrate, and finally replacing interlayer anions of hydrotalcite with sulfenyl anions. The adsorbent obtained by the preparation method not only has the adsorption capacity of independent biochar and hydrotalcite on heavy metals, but also can obtain a loose and porous biochar material by activating a biomass material, and then the biochar material can be further expanded through a hydrothermal reaction, and the loading capacity and the loading stability of the hydrotalcite are improved; finally, the adsorption capacity of the heavy metal anions is remarkably improved through interlayer replacement of the sulfenyl anions.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment and soil remediation, and more specifically relates to a sulfur-based intercalation hydrotalcite-modified biochar-based adsorption material, its preparation and application. Background technique [0002] With the rapid development of the economy, the demand for basic industrial products in various industries has increased sharply, such as steelmaking, leather, semiconductors, etc., and a large amount of pollutants will inevitably be produced in the production process. Among them, heavy metals (HMs) pollution has attracted extensive attention from researchers due to its high toxicity, difficulty in remediation, and long residence time. In addition, if heavy metal pollution is not treated in time, it will spread to groundwater and soil, and further enrich in organisms and plants, threatening the safety of food and drinking water, and seriously affecting the living environment of human b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01J20/32C02F1/28B09C1/00C02F101/20
CPCB01J20/20B01J20/3078B01J20/3085B01J20/3071B01J20/32C02F1/283B09C1/00B01J2220/4825C02F2101/20
Inventor 张世红廖玮张涵周晓鸣陈卓远张雄邵敬爱杨海平王贤华陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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