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Macroporous biochar-based hybrid material for ultrafast removing heavy metals in water body as well as preparation method and application of macroporous biochar-based hybrid material

A biochar, heavy metal technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve problems such as slow adsorption kinetics, and achieve the effects of increasing adsorption speed, small proportion, and simple modification process

Inactive Publication Date: 2020-05-15
HUANGSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical bottleneck of slow adsorption kinetics caused by the high proportion of small pores (<2nm) in the existing biochar-based nano-hybrid materials (accounting for more than 50%), the purpose of the present invention is to provide an ultra-fast Macroporous biochar-based hybrid material for removing heavy metals in water, its preparation method and application

Method used

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  • Macroporous biochar-based hybrid material for ultrafast removing heavy metals in water body as well as preparation method and application of macroporous biochar-based hybrid material
  • Macroporous biochar-based hybrid material for ultrafast removing heavy metals in water body as well as preparation method and application of macroporous biochar-based hybrid material
  • Macroporous biochar-based hybrid material for ultrafast removing heavy metals in water body as well as preparation method and application of macroporous biochar-based hybrid material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Combine 2g peanut shells with 10g KHCO 3 Mix evenly, pyrolyze at 600°C for 1 hour under argon atmosphere to prepare macroporous biochar, then wash and dry with dilute hydrochloric acid with a mass fraction of 10%, and then screen out macroporous biochar with a particle size of 0.2-0.3mm Add to 200mL 1mol / L MnCl 2 solution, and then stirred at 60°C water bath temperature for 20h to ensure that Mn 2+ Fully diffuse into the pores of macroporous biochar, and then filter out to obtain solid materials; add the solid materials to 200mL of a mixed solution composed of NaOCl solution and NaOH solution, the active chlorine content in the mixed solution is 5%, and the mass fraction of NaOH is 10%; Stir at 25°C for 24h, then filter out the solid and wash repeatedly until the pH of the eluate is 8.5, dry the solid substance at 50°C to constant weight, and obtain the macroporous biochar-based nano manganese oxide hybrid material.

[0035] The particle size of the hybrid material is...

Embodiment 2

[0039] Mix 3g coconut shell with 12g NaHCO 3 Mix evenly, and pyrolyze at 500°C for 1 hour under an argon atmosphere to prepare macroporous biochar, then wash and dry with 15% dilute hydrochloric acid, and then filter out macroporous biochar with a particle size of 0.4-0.5mm and add it to 500mL. .5mol / L of MnSO 4 solution, and then stirred at 30°C water bath temperature for 15h to ensure that Mn 2+ Fully diffuse into the pores of macroporous biochar, and then filter out to obtain solid materials; add the solid materials to 400mL of a mixed solution composed of NaOCl solution and NaOH solution, the active chlorine content in the mixed solution is 6%, and the mass fraction of NaOH is 8%; Stir at 25°C for 18h, then filter out the solid and wash repeatedly until the pH of the eluate is 7, and dry the solid at 50°C to constant weight to obtain a macroporous biochar-based nano manganese oxide hybrid material.

[0040] The particle size of the hybrid material is 0.4-0.5mm and the su...

Embodiment 3

[0042] Mix 1g of peanut shells with 4g of KHCO 3 Mix evenly, and pyrolyze at 600°C for 1 hour under an argon atmosphere to prepare macroporous biochar, then wash and dry with 20% dilute hydrochloric acid, and then filter out macroporous biochar with a particle size of 0.1-0.2mm and add to 200mL1mol / L MnCl 2 solution, and then stirred at 60°C water bath temperature for 20h to ensure that Mn 2+ Fully diffuse into the pores of macroporous biochar, and then filter out to obtain solid materials; add the solid materials to 200mL of a mixed solution composed of NaOCl solution and NaOH solution, the active chlorine content in the mixed solution is 3%, and the mass fraction of NaOH is 5%; Stir at 25°C for 24h, then filter out the solid and wash repeatedly until the pH of the eluate is 8.5, and dry the solid at 50°C to constant weight to obtain a macroporous biochar-based nano manganese oxide hybrid material. The particle size of the hybrid material is 0.1-0.2mm, and the surface area...

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Abstract

The invention discloses a macroporous biochar-based hybrid material for ultrafast removing heavy metals in a water body as well as a preparation method and application of the macroporous biochar-basedhybrid material. The preparation method of the material comprises the following steps: (1) uniformly mixing agricultural wastes with a foaming agent, carrying out a pyrolytic reaction, cleaning withan acid solution, and drying to obtain macroporous biochar; (2) putting the macroporous biochar into a metal salt solution, stirring, and filtering to obtain a solid material; and (3) adding the solidmaterial into a mixed solution composed of a NaOCl solution and a NaOH solution, stirring, filtering out, washing with water, and drying to constant weight to obtain the target product. According tothe invention, the integration of rapid adsorption and selective adsorption functions of the hybrid material is realized through the steps of foaming and in-situ deposition, deep purification of heavymetal pollutants in various water bodies can be realized, the purification speed of heavy metals is obviously increased, the modification process is simple, and the cost is relatively low; the adsorption-saturated hybrid material can also be effectively regenerated by adopting a mixed solution of HCl and CaCl2 so as to realize recycling.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and in particular relates to a macroporous biochar-based hybrid material for ultrafast removal of heavy metals in water bodies, a preparation method and application thereof. Background technique [0002] At present, heavy metal pollution is a prominent environmental problem in the world, seriously affecting the ecological environment and economic development. Due to their high toxicity and strong accumulation, even low concentrations of heavy metals can cause irreparable damage to living organisms. The advanced treatment of heavy metals and "zero discharge" have gradually become the consensus in the field of environmental protection. Commonly used heavy metal pollution control technologies mainly include chemical precipitation, coagulation, ion exchange, membrane separation and adsorption, among which the adsorption method is favored by its advantages of easy operation, good eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/28B01J20/30C02F101/20
CPCB01J20/06B01J20/20B01J2220/485C02F1/283C02F2101/20
Inventor 万顺利李燕董丽丽马明海钱丽萍唐贵陈卫旸
Owner HUANGSHAN UNIV
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