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Preparation method of polyphenol iron oxide adsorption material for heavy metal wastewater treatment

A technology for wastewater treatment and adsorption materials, applied in the directions of alkali metal oxides/hydroxides, alkali metal compounds, water/sewage treatment, etc., can solve the problems of long adsorption equilibrium time, complex synthesis process, low adsorption performance, etc. The effect of short time-consuming, simple synthesis steps and high adsorption efficiency

Pending Publication Date: 2022-01-14
NANJING UNIV OF INFORMATION SCI & TECH
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  • Description
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Problems solved by technology

[0005] Aiming at the problems of low adsorption performance, high cost, complicated synthesis process and long adsorption equilibrium time of common metal chelate adsorbents, the present invention provides a preparation method of polyphenolic iron oxide adsorption material for heavy metal wastewater treatment

Method used

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  • Preparation method of polyphenol iron oxide adsorption material for heavy metal wastewater treatment
  • Preparation method of polyphenol iron oxide adsorption material for heavy metal wastewater treatment
  • Preparation method of polyphenol iron oxide adsorption material for heavy metal wastewater treatment

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Embodiment 1

[0026] Add 10 mL of 100 mg / mL ellagic acid solution to a 25 mL centrifuge tube, then add 2 mL of 20 mg / mL FeCl to the ellagic acid solution 3 ·6H 2 O solution, adjust the pH to 7.2 with NaOH solution, shake and mix evenly in a shaker, let it stand for 1h, centrifuge and wash it, then add 10mL 0.1mol / L NaOH solution to it and stir for 2h, wash until neutral and dry The polyphenol iron oxide adsorption material for heavy metal wastewater treatment can be obtained.

[0027] Such as figure 1 As shown, using the polyphenol-iron oxide adsorbent material prepared in this embodiment, the scanning electron microscope of the material was observed. Compared with the HFO material, it was observed that the material was more dispersed, and the adsorbent material had excellent dispersion performance.

Embodiment 2

[0029] In a 25mL centrifuge tube, add 8mL of 50mg / mL tannic acid solution, and then add 0.864mL of 40mg / mL Fe(NO 3 ) 3 solution, with NaHCO 3 Adjust the pH of the solution to 7.2, vortex and mix evenly, centrifuge and wash, then add 10mL 0.1mol / L NaOH solution and stir for 1.5h, wash until neutral and freeze-dried to obtain polyphenolic iron oxide adsorption for heavy metal wastewater treatment Material.

[0030] The polyphenol-iron oxide adsorbent material prepared by this embodiment can be synthesized within 3 hours at room temperature, the operation is simple, the source of raw materials is wide, safe and environmentally friendly, and the adsorption capacity reaches 340 mg / g.

[0031] Using the polyphenol-iron oxide adsorbent material prepared in this embodiment, the adsorption isotherm experiment was carried out, and 0.025g of the material was weighed in a 250mL conical flask, and 50mL of Pb with different concentrations were added 2+ Put the solution into a shaker for ...

Embodiment 3

[0034] Add 20mL of 50mg / mL gallic acid solution to a 25mL centrifuge tube, and then add 4mL of 80mg / mL FeCl to the gallic acid solution 3 solution, adjust the pH to 7.2 with KOH solution, shake on a shaking table for 1 hour, centrifuge and wash it, then add 10 mL of 0.2 mol / L NaOH solution and stir for 3 hours, wash until neutral and freeze-dried to obtain heavy metal wastewater treatment. Phenolic iron oxide adsorption material.

[0035] The polyphenol-iron oxide adsorbent material prepared by this embodiment can be synthesized at normal temperature, with simple operation, wide sources of raw materials, safety and environmental protection, and has specific adsorption for heavy metals in the presence of competing ions.

[0036] Using the polyphenol-iron oxide adsorbent material prepared in this embodiment, a competitive ion experiment was carried out, and 0.025g of the material was weighed in a 250mL Erlenmeyer flask, and 50mL of 200mg / L Pb was added respectively. 2+ solution...

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Abstract

The invention relates to a preparation method of a polyphenol iron oxide adsorption material for heavy metal wastewater treatment, and belongs to the technical field of environmental functional material preparation. According to the polyphenol iron oxide adsorption material for heavy metal wastewater treatment, a net-shaped cross-linked structure is formed through plant polyphenol and Fe < 3 + >, polyphenol contains a large number of phenolic hydroxyl groups and is prone to chelation reaction with metal ions, a stable metal-polyphenol network structure is formed through the strong interaction of the metal ions and catechol on the polyphenol, the material has high electronegativity because of a large number of phenolic hydroxyl groups contained, positive ions can be gathered to the periphery of the material to achieve a pre-enrichment effect, and the adsorption efficiency of the material can be improved. In addition, iron ions react with polyphenol, then an alkaline solution is added for in-situ precipitation, and therefore the polyphenol iron oxide adsorption material for heavy metal wastewater treatment is obtained, and the polyphenol iron oxide adsorption material for heavy metal wastewater treatment is simple in synthesis step, short in time consumption, low in raw material cost, easy to obtain and high in adsorption efficiency.

Description

technical field [0001] The invention relates to a preparation method of a polyphenol iron oxide adsorption material for heavy metal wastewater treatment, and belongs to the technical field of preparation of environmental functional materials. Background technique [0002] At present, among the various methods using metal chelation (such as chemical precipitation and ion exchange), the adsorption method is promising because of its simple operation, large processing capacity, high processing efficiency, and low processing cost. Currently existing commercial adsorbents, such as commercial ion exchange resins, have high adsorption capacity but poor selectivity, and cannot selectively adsorb toxic heavy metal ions well in the presence of competing ions. Hydrated iron oxide is widely used in the field of material adsorption due to its excellent physical and chemical properties, and has excellent selective adsorption. However, due to the extremely fine particles of hydrated iron ox...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28C02F1/28B01J20/30C02F101/20
CPCB01J20/22B01J20/06B01J20/28009C02F1/281C02F1/285C02F2101/20B01J2220/46
Inventor 邱慧杨璐阳倪文翔王励珽方昊陈凯
Owner NANJING UNIV OF INFORMATION SCI & TECH
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