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Preparation method and use method of magnetic porous biochar for removing chromium in water

A biochar and water removal technology, applied in chemical instruments and methods, water pollutants, biofuels, etc., can solve the problems of easy agglomeration, difficult recovery, inactivation, etc., and achieve easy separation, multiple effective sites, and low cost. Effect

Active Publication Date: 2020-05-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of nano-zero-valent iron usually requires the use of additional reducing agents, and the chemical properties of the finished product are active, easy to agglomerate, deactivate, and difficult to recycle

Method used

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  • Preparation method and use method of magnetic porous biochar for removing chromium in water
  • Preparation method and use method of magnetic porous biochar for removing chromium in water
  • Preparation method and use method of magnetic porous biochar for removing chromium in water

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preparation example Construction

[0049] A preparation method of magnetic porous biochar that removes chromium in water, using Fe(III) as a magnetic precursor, slow pyrolysis and in-situ carbon reduction after impregnation and loading, to prepare Artemia egg shells into magnetic porous biochar carbon.

[0050] The biomass raw material of the biochar is Artemia eggshell, which belongs to the waste of the aquatic industry, has low cost, and can realize waste utilization at the same time; the magnetism is derived from nano-Fe 3 o 4 Particles, Nano Fe 3 o 4 The average particle size is about 70nm, and its precursor is Fe(III). During the slow pyrolysis process of egg shells, part of Fe(III) is reduced to Fe(II) in situ by the generated carbon without additional Adding other reducing agents, the preparation method is simple;

[0051] The porous structure is a microscopic multi-level channel structure with a pore size of 200nm-2μm, nano-Fe 3 o 4 The particles are evenly distributed in the multi-level channels....

Embodiment 1

[0066] Weigh 5g of Artemia egg shells washed with ethanol solution and soak in 200mL of 1mol / L FeCl 3 The solution was stirred at 25°C for 24h, then the solid was filtered out and dried at 60°C.

[0067] The above-mentioned dried solids were placed in a tube furnace, and after nitrogen protection, the temperature was raised to 450°C at a heating rate of 12.5°C / min, and the heating was stopped after keeping for 5 hours to complete slow pyrolysis and in-situ carbon reduction. process.

[0068] After the material was cooled to room temperature, it was ground, rinsed with deionized water, and dried at 60°C to obtain magnetic porous biochar.

[0069] Such as figure 1 As shown, the magnetic porous biochar retains a complete multi-level pore structure, and the nanoparticles are evenly distributed in the pores. 3 o 4 form exists, figure 2 Its XRD characteristic diffraction peak.

Embodiment 2

[0071] Take 0.025 g of the magnetic porous biochar prepared in Example 1, and add it to K with an initial Cr(VI) concentration of 50 mg / L. 2 Cr 2 o 7 solution, the volume of the solution was 50 mL, and the pH was adjusted to 2.0 with NaOH and HCl. The above system was shaken at 160 rpm for 24 hours at 25°C. After the reaction, the biochar was magnetically separated, and the remaining chromium ion concentration in the liquid phase was measured by diphenylcarbazide spectrophotometry. The calculated Cr(VI) adsorption amount was 143.89 mg / g, and the removal rate was 94.26%.

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Abstract

The invention discloses a preparation method and a use method of magnetic porous biochar for removing chromium in water. Fe (III) is used as a magnetic precursor; by carrying out low-speed pyrolysis and in-situ carbon reduction after dipping and loading, artemia cyst shells are prepared into the magnetic porous biochar; the magnetic porous biochar can be used for removing Cr (VI) and Cr (III) in water, when the magnetic porous biochar is used, the magnetic porous biochar is put into chromium-containing water, the magnetic porous biochar adsorbent is subjected to magnetic separation or standingprecipitation separation after a certain period of time, chromium removal is completed, and when common anions in water coexist, a high chromium removal rate can still be obtained, and meanwhile, themagnetic porous biochar can be repeatedly used.

Description

technical field [0001] The invention relates to an adsorbent for removing heavy metals in water, in particular to a magnetic porous biochar for removing chromium, which belongs to the water heavy metal pollution treatment technology. Background technique [0002] Due to chromium salt production, tanning, electroplating, wood preservation, dye printing and dyeing, and industrial production activities of rubber and ceramics, a large amount of chromium-containing wastewater is produced, of which chromium mainly exists in the form of chromate and dichromate. Cr(VI) enters the human body through skin contact, the respiratory system and digestive system, and is transported to the liver and kidneys and other organs through the blood to cause toxic accumulation, damage kidney function, cause DNA damage, and lead to cancer. Cr(Ⅲ) has certain toxicity to aquatic organisms, and may also show toxic reactions to human cells at high doses. [0003] Chromium removal technologies in water ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/48C02F1/52C02F101/22
CPCB01J20/20B01J20/28009B01J20/28054C02F1/283C02F1/488C02F1/5236C02F2101/22B01J2220/4881Y02E50/10
Inventor 孙奇娜刘欣超贾清川张庆瑞韩梦星牛一卉李才才
Owner YANSHAN UNIV
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