Single-layer hydrotalcite nano material and application thereof in efficient mineralization removal of high-concentration heavy metal ions in wastewater

A technology of heavy metal ions and nano-materials, which is applied in the field of mineralization treatment, can solve the problems of large consumption and weak stability, and achieve the effects of high-efficiency removal, large specific surface area, and improved adsorption rate and capacity

Pending Publication Date: 2022-01-04
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commonly used adsorbents include activated carbon, hydroxyapatite, lime, etc., which have problems such as large consumption and weak stability in acidic heavy metal waste liquid. The development of high-performance adsorption mineralizers is the core issue in this field.

Method used

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  • Single-layer hydrotalcite nano material and application thereof in efficient mineralization removal of high-concentration heavy metal ions in wastewater
  • Single-layer hydrotalcite nano material and application thereof in efficient mineralization removal of high-concentration heavy metal ions in wastewater
  • Single-layer hydrotalcite nano material and application thereof in efficient mineralization removal of high-concentration heavy metal ions in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Preparation of single-layer MgAl-LDH nanomaterials:

[0040] 0.01875mol Mg(NO 3 ) 2 ·6H 2 O, 0.00625mol Al(NO 3 ) 3 9H 2 O plus 0.0.0625 molH 3 BO 3 Dissolve in 100mL to remove CO 2 water and recorded as solution A. 0.075mol NaOH dissolved in 100 mL to remove CO 2 water and recorded as solution B. where the excess base is used to neutralize the H 3 BO 3 Excess H carried + . Solution A and solution B were simultaneously and uniformly poured into a fully back-mixed rotary liquid film reactor with a rotating speed of 3000 rpm and back-mixed for 2 minutes to obtain a suspension.

[0041] Preparation of single-layer hydrotalcite peeling: the product after centrifugation of the suspension is peeled with acetone, and finally washed with ethanol until neutral, and then placed in a vacuum oven for drying.

[0042] Preparation of multilayer hydrotalcite: centrifuge the suspension, wash with deionized water, and dry in a vacuum oven.

[0043]2. Prepare the solut...

Embodiment 2

[0048] Preparation of single-layer NiFe-LDH material:

[0049] 0.01875mol Ni(NO 3 ) 2 ·6H 2 O, 0.00625mol Fe(NO 3 ) 3 9H 2 O plus 0.0.0625mol H 3 BO 3 Dissolve in 100mL to remove CO 2 water and recorded as solution A. Dissolve 0.075mol NaOH in 100mL to remove CO 2 water and recorded as solution B. where the excess base is used to neutralize the H 3 BO 3 Excess H carried + . Solution A and solution B were poured into a colloid mill with a rotating speed of 3000 rpm at a constant speed and mixed for 2 minutes to obtain a suspension.

[0050] Preparation of single-layer hydrotalcite peeling: the product after centrifugation of the suspension is peeled with acetone, and finally washed with ethanol to neutrality, then vacuum rotary evaporated and dried.

[0051] Preparation of multi-layer hydrotalcite: centrifuge the suspension, wash with deionized water, and dry by vacuum rotary evaporation.

[0052] To characterize the material: e.g. Image 6 As shown, there is n...

Embodiment 3

[0054] Preparation of monolayer CoFe-LDH material:

[0055] 0.01875mol Co(NO 3 ) 2 ·6H 2 O, 0.00625mol Fe(NO 3 ) 3 9H 2 O plus 0.0.0625mol H 3 BO 3 Dissolve in 100mL to remove CO 2 water and recorded as solution A. Dissolve 0.075mol NaOH in 100mL to remove CO 2 water and recorded as solution B. where the excess base is used to neutralize the H 3 BO 3 Excess H carried + . Solution A and solution B were poured into a colloid mill with a rotating speed of 3000 rpm at a constant speed and mixed for 2 minutes to obtain a suspension.

[0056] Preparation of single-layer hydrotalcite peeling: the product after centrifugation of the suspension is peeled with acetone, and finally washed with ethanol until neutral, and then placed in a vacuum oven for drying.

[0057] Preparation of multilayer hydrotalcite: centrifuge the suspension, wash with deionized water, and dry in a vacuum oven.

[0058] Characterize the material: according to Figure 9 As shown, the monolayer Co...

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Abstract

The invention discloses a single-layer hydrotalcite nano material and an application thereof in efficient mineralization removal of high-concentration heavy metal ions in wastewater. Boric acid is added into a mixed solution of soluble divalent metal salt and soluble trivalent metal salt, the boric acid is combined in an aqueous solution to obtain [B4O5(OH)4]<2->, then the [B4O5(OH)4]<2-> and an alkali solution are simultaneously added into a full-backmixing rotating liquid membrane reactor to obtain intercalated hydrotalcite with uniform particle size, and the relatively large steric hindrance of the [B4O5(OH)4]<2-> increases the interlayer plate spacing of the hydrotalcite; and then peeling is carried out by using an interlayer plate inhibitor acetone, finally, washing is carried out to be neutral by using ethanol to obtain a single-layer hydrotalcite nanosheet, and the single-layer hydrotalcite nanosheet is dried to obtain single-layer hydrotalcite nano material powder. The prepared single-layer hydrotalcite nano material has a large specific surface area, can provide more adsorption active sites, improves the adsorption rate and capacity of heavy metal ions, and can achieve a high-speed and efficient removal effect on common heavy metal ions in various electroplating wastewater.

Description

technical field [0001] The invention belongs to the technical field of mineralization treatment of wastewater containing heavy metal ions, and in particular relates to a single-layer hydrotalcite nanometer material and its application in efficient mineralization to remove high-concentration heavy metal ions in wastewater. Background technique [0002] At present, the treatment methods of heavy metal ions in wastewater mainly include: chemical method, adsorption method, electrochemical method, ion exchange method and biological method, but each method has disadvantages to varying degrees. Among them, chemical methods usually use neutralization precipitation, sulfide precipitation, etc., but such methods are usually incomplete, and it is difficult to directly meet the country's discharge requirements for corresponding heavy metal ions; electrochemical methods usually use direct current to remove heavy metal ions, and its energy consumption Relatively large, and not suitable fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/06B01J20/04B01J20/30C02F1/28C02F101/20
CPCB01J20/08B01J20/06B01J20/041B01J20/3085B01J20/3071C02F1/281C02F2101/20
Inventor 赵宇飞宋宇飞来天艺
Owner BEIJING UNIV OF CHEM TECH
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