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Ferrihydrite@bone black material for synchronously fixing anion and cation heavy metal ions

A technology of heavy metal ions, ferrihydrite

Pending Publication Date: 2021-12-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Many biochar adsorbent patents including the above two patents only focus on the fixation of cationic heavy metals, without considering the adsorption of anionic heavy metals and the simultaneous adsorption and fixation of anion and cation heavy metal ions

Method used

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  • Ferrihydrite@bone black material for synchronously fixing anion and cation heavy metal ions
  • Ferrihydrite@bone black material for synchronously fixing anion and cation heavy metal ions
  • Ferrihydrite@bone black material for synchronously fixing anion and cation heavy metal ions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] After the bovine bone charcoal is crushed and ground by a pulverizer, it is sieved with an 80-mesh sieve to make the particle size less than 2mm.

[0056] Add 1 part of bovine bone charcoal to 18 parts of deionized water according to the mass ratio, and use an ultrasonic generator to sonicate for 10 minutes.

[0057] Under magnetic stirring, add 1 part of 1mol / L ferric chloride solution in 4 parts of mixed solution according to the volume ratio, so that the mass ratio of iron element and bovine bone charcoal in the mixed solution is 1:4; then according to the solid-liquid ratio of 1:100 ( g / mL) solid sodium sulfate was added to the mixture, and the stirring was continued for 10 minutes.

[0058] Insert the electronic pH meter into the mixed solution, add 5mol / L sodium hydroxide solution drop by drop into the mixed solution under magnetic stirring, keep the rate of 1 second / drop constant until the pH value of the mixed solution rises to 8.0.

[0059] After the mixed sol...

Embodiment 2

[0064] After the pig bone charcoal is crushed and ground by a pulverizer, it is sieved with an 80-mesh sieve to make the particle size less than 2mm.

[0065] Add 1 part of pork bone charcoal to 18 parts of deionized water according to the mass ratio, and use an ultrasonic generator to sonicate for 10 minutes.

[0066] Under magnetic stirring, add 1 part of 1mol / L ferric chloride solution in 4 parts of mixed solution by volume ratio, so that the mass ratio of iron element and pig bone charcoal in the mixed solution is 1:2; then press the solid-liquid ratio of 1:50 ( g / mL) solid sodium sulfate was added to the mixture, and the stirring was continued for 10 minutes.

[0067] Insert the electronic pH meter into the mixture, add 5mol / L sodium hydroxide solution drop by drop into the mixture under magnetic stirring, keep the rate of 1 second / drop constant until the pH value of the mixture rises to 8.5.

[0068] After the mixed solution was stabilized at room temperature for 12 hou...

Embodiment 3

[0071] After the sheep bone charcoal is crushed and ground by a pulverizer, it is sieved with an 80-mesh sieve to make the particle size less than 0.20mm.

[0072] Add 1 part of sheep bone charcoal to 18 parts of deionized water according to the mass ratio, and use an ultrasonic generator to sonicate for 10 minutes.

[0073] Under magnetic stirring, add 1 part of 1mol / L ferric chloride solution into 4 parts of mixed solution according to the volume ratio, so that the mass ratio of iron element and sheep bone charcoal in the mixed solution is 1:6; then according to the solid-liquid ratio of 1:200 ( g / mL) solid sodium sulfate was added to the mixture, and the stirring was continued for 10 minutes.

[0074] Insert the electronic pH meter into the mixture, add 5mol / L sodium hydroxide solution drop by drop into the mixture under magnetic stirring, keep the rate of 1 second / drop constant until the pH value of the mixture rises to 8.2.

[0075] After the mixed solution was stabilize...

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Abstract

The invention belongs to the field of heavy metal pollution repair, and provides a ferrihydrite@bone black material for synchronously fixing anion and cation heavy metal ions, wherein the ferrihydrite@bone black material comprises 8-20 wt% of a calcium element, 8-14 wt% of a phosphorus element, and 15-30 wt% of an iron element. The method comprises the steps: adding bone black into a ferric salt solution at normal temperature, stirring, adding a certain amount of sodium sulfate solid, stirring, slowly dropwise adding a sodium hydroxide solution until the pH value of the mixed solution reaches 8.0-8.5, and keeping a stirring state in the whole reaction process; and standing and stabilizing the system at room temperature for 12 hours, filtering to obtain a solid, and drying to finally obtain ferrihydrite composite biological hydroxyapatite. The preparation process is energy-saving, low in consumption, economical, practical, green and environment-friendly, the specific surface area of the material is enlarged, the surface property of the material is changed, and the material has an adsorption effect in a combined pollution environment and can synchronously fix various anion and cation heavy metals such as Pb (II), Cd (II) and AsO2<->.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal pollution, in particular to a material for synchronously fixing negative and positive heavy metal ions. The invention also relates to the preparation method and application of the material. Background technique [0002] Bone charcoal material is rich in phosphate and calcium ions, which can adsorb heavy metals more stably through surface precipitation and ion exchange, and reduce the desorption of heavy metals due to environmental changes. However, bone char materials containing hydroxyapatite only have a good adsorption effect on cationic heavy metals, such as Pb(II), Cd(II), Cu(II), Zn(II), etc. For anionic heavy metals, such as As(III)-containing arsenite (AsO 2 - ), containing Cr(VI) dichromate (Cr 2 o 7 2- ) and other adsorption capacity is extremely low or almost no adsorption effect. [0003] Chinese patent CN111250053A discloses a method for preparing a water treatment agen...

Claims

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Application Information

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IPC IPC(8): B01J20/20B09C1/08C02F1/28B01J20/30C02F101/10C02F101/20
CPCB01J20/20B01J20/06C02F1/283B01J20/0277C02F1/281B09C1/08C02F2101/103C02F2101/20
Inventor 邱宇平洪诚一祝凌张吉琛
Owner TONGJI UNIV
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