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Method for removing heavy metals in wastewater by using magnetic nano-chloroapatite adsorbent

A technology of chloroapatite and magnetic nano, which is applied in the direction of adsorption of water/sewage treatment, alkali metal compounds, chemical instruments and methods, etc., and can solve problems such as application limitations of nanomaterials, difficulty in solid-liquid separation, and eutrophication of water bodies. Achieve the effect of remarkable removal effect, wide application prospect and short time consumption

Inactive Publication Date: 2019-01-29
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanomaterials that exist in the form of powder solids have defects such as difficult solid-liquid separation and low sedimentation rate in practical applications; and once discharged into the environment with wastewater, it is easy to cause eutrophication of the water body
These problems limit the application of nanomaterials

Method used

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  • Method for removing heavy metals in wastewater by using magnetic nano-chloroapatite adsorbent
  • Method for removing heavy metals in wastewater by using magnetic nano-chloroapatite adsorbent
  • Method for removing heavy metals in wastewater by using magnetic nano-chloroapatite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation method of the magnetic nanometer chloroapatite adsorbent that the inventive method adopts comprises the following steps:

[0037] (1) 1.85mmol of FeCl 2 4H 2 O and 3.7 mmol FeCl 3 ·6H 2 O was dissolved in 30 mL of deoxygenated water and sonicated for 10 min. Under the condition of continuous stirring, 10 mL of ammonia solution with a concentration of 25% was added to obtain a mixed solution.

[0038] (2)CaCl 2 Solution preparation: weigh 1.9698g CaCl 2 2H 2 O into a beaker, add an appropriate amount of ultrapure water to dissolve and transfer to a 500mL volumetric flask, use ultrapure water to make up the volume to the mark, and shake well to obtain a concentration of 26.8mM CaCl 2 solution.

[0039] Na 3 PO 4 Solution preparation: weigh 3.04g Na 3 PO 4 12H 2 0 into a beaker, add an appropriate amount of ultrapure water to dissolve and transfer to a 500mL volumetric flask, use ultrapure water to make the volume up to the mark, and shake well t...

Embodiment 2

[0046] A kind of method utilizing magnetic nano chloroapatite adsorbent of the present invention to remove heavy metals in waste water comprises the following steps:

[0047] (a) Take three kinds of heavy metal ions (Pb 2+ 、Cd 2+ , Zn 2+ ) concentration of 2mM wastewater, and adjust the pH value of the wastewater to 10.0±0.1 with 1M NaOH solution.

[0048] (b) Add the magnetic nano-chloroapatite adsorbent in Example 1 to the waste water of 20mL step (a) respectively, the consumption of adsorbent is 1g / L, shake at a constant temperature of 25°C, and the oscillation speed is 120r / min . After 24 hours, the magnetic nano-chloroapatite adsorbent was separated from the above solution with a magnet to remove heavy metal ions in the wastewater; Unadsorbed Pb 2+ 、Cd 2+ , Zn 2+ content. The measurement results are shown in Table 1.

[0049] Table 1: Removal rate of heavy metals in wastewater

[0050] Heavy Metal Ions in Wastewater

Embodiment 3

[0052] A kind of method utilizing magnetic nano chloroapatite adsorbent of the present invention to remove heavy metals in waste water comprises the following steps:

[0053] (a) Take three kinds of heavy metal ions (Pb 2+ 、Cd 2+ , Zn 2+ ) concentration of 2mM wastewater, and adjust the pH value of the wastewater to 5.0±0.1 with 1M HCl solution respectively.

[0054] (b) Add the magnetic nano-chloroapatite adsorbent of Example 1 to 20mL of the waste water of step (a) respectively, the amount of adsorbent is 1g / L, shake at a constant temperature of 25°C, and the oscillation speed is 120r / min. After 24 hours, the magnetic nano-chloroapatite adsorbent was separated from the above solution with a magnet to remove heavy metal ions in the wastewater; Unadsorbed Pb 2+ 、Cd 2+ , Zn 2+ content. The measurement results are shown in Table 2.

[0055] Table 2: Removal rate of heavy metals in wastewater

[0056] Heavy Metal Ions in Wastewater

[0057] From the experimenta...

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Abstract

The invention discloses a method for removing heavy metals in waste water by using a magnetic nano chlorapatite adsorbent. The method comprises the following steps: adding the magnetic nano chlorapatite adsorbent in the waste water; oscillating at constant temperature; and then magnetically separating the magnetic nano chlorapatite adsorbent from the solution so as to remove heavy metal ions in the waste water, wherein the magnetic nano chlorapatite adsorbent comprises nano chlorapatite and magnetic powder Fe2O3, and the molar ratio of the magnetic powder Fe2O3 to the nano chlorapatite is 1-11:1. The method is simple to operate, high in removal rate of heavy metals, low in cost, clean and pollution-free, and does not have toxic or harmful effects on the environment.

Description

technical field [0001] The invention belongs to the field of treatment of heavy metals in waste water, and in particular relates to a method for removing heavy metals in waste water by using a magnetic nano-chloroapatite adsorbent. Background technique [0002] With the acceleration of economic globalization and the rapid development of industry and agriculture, the environmental pollution caused by heavy metal emissions has gradually become prominent. Toxic heavy metal ions flow into rivers and rivers along with the discharged wastewater, and penetrate into the groundwater, seriously damaging the ecological environment. How to solve the problem of heavy metal pollution has become an important research topic all over the world. [0003] At present, as an emerging technology, magnetic separation technology has been widely concerned in the field of water treatment. Magnetic separation technology is a physical method to separate substances with different magnetic properties by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/48B01J20/04B01J20/06B01J20/28B01J20/30C02F101/20
CPCB01J20/048B01J20/06B01J20/28009C02F1/281C02F1/488C02F2101/20
Inventor 万佳赖萃曾光明黄丹莲胡亮文米黄超程敏姜丹妮
Owner HUNAN UNIV
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