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LDH (layered double hydroxide) microspheres for sewage treatment and preparation method

A layered bimetallic and hydroxide technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as difficult removal of heavy metals, achieve excellent adsorption and prevent shedding effects

Inactive Publication Date: 2018-02-09
LINYI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For heavy metal polluted water is difficult to remove the defect of heavy metals, the first purpose of the present invention is to provide a kind of layered double metal hydroxide microspheres for treating sewage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 18mol of calcium chloride and 6mol of ferric chloride in an aqueous solution, add N-methylpyrrolidone dispersant and 7.5mol (molar amount (calculated as carbon) graphene, then add 0.2mol urea precipitant, 140 degrees Celsius hydrothermal reaction for 5 days to obtain iron-calcium layered double metal hydroxide containing graphene, centrifuge after cooling, wash with water to pH7.0, alcohol Wash 2 times and dry; (2) fixation of graphene-containing iron-calcium layered double hydroxide: mix the graphene-containing iron-calcium layered double hydroxide with 300g Molten waste glass is sprayed and collided to form layered double hydroxide microspheres fixed by microporous glass.

[0029]Get 200g of prepared microspheres of layered double metal hydroxide fixed by microporous glass and drop into 10L of aqueous solution with lead content 0.5mg / L, mercury content 0.1mg / L, chromium content 0.2mg / L, stir ...

Embodiment 2

[0031] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 15 mol of calcium chloride and 6 mol of ferric sulfate in an aqueous solution, add N-methylpyrrolidone dispersant and 7.5 mol (mole Carbon meter) graphene, then add 0.2mol urea precipitant, 150 degrees Celsius hydrothermal reaction for 4 days to obtain graphene-containing iron-calcium layered double metal hydroxide, after cooling, centrifuge, wash with water to pH7.0, wash with alcohol 2 times, drying; (2) fixation of graphene-containing iron-calcium layered double hydroxides: the iron-calcium layered double hydroxides containing graphene after step (1) was dried with 300g of molten The waste glass was collided by spray method to form layered double metal hydroxide microspheres fixed by microporous glass.

[0032] Get 200g of prepared microspheres of layered double metal hydroxide fixed by microporous glass and drop into 10L of aqueous solution with lead content 0.5mg / L, mercury content 0.1mg / L...

Embodiment 3

[0034] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 18mol of calcium chloride and 6mol of ferric chloride in an aqueous solution, add N-methylpyrrolidone dispersant and 7.5mol (molar amount (calculated as carbon) graphene, then add 0.2mol hexamethylenetetramine precipitant, 155 degrees centigrade hydrothermal reaction for 4 days to obtain iron-calcium layered double metal hydroxide containing graphene, centrifuge after cooling, wash with water until pH 7.0, washed twice with alcohol and dried; (2) Fixation of graphene-containing iron-calcium layered bimetallic hydroxide: The graphene-containing iron-calcium layered bimetallic hydroxide after step (1) was dried Hydroxide and 300g of molten waste glass are sprayed and collided to form microspheres of layered double metal hydroxide fixed by microporous glass.

[0035] Get 200g of prepared microspheres of layered double metal hydroxide fixed by microporous glass and drop into 10L of aqueous solution...

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PUM

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Abstract

The invention relates to the field of sewage treatment materials, in particular to LDH (layered double hydroxide) microspheres for sewage treatment and a preparation method. The LDH microspheres for sewage treatment are prepared with the method as follows: (1) after a calcium salt solution and a ferric salt solution are mixed uniformly, a dispersant and graphene are added, a precipitator is added,the mixture is subjected to a hydrothermal reaction, and ferric-calcium LDH containing graphene is obtained, cooled, centrifuged, subjected to water washing until the pH is 6.5-7.5, subjected to alcohol washing 1-2 times and then dried; (2) the dried ferric-calcium LDH containing graphene in the step (1) and molten waste glass are subjected to collision with a spraying method, and the LDH microspheres fixed by porous glass are formed. Heavy metals are transferred to the LDH through adsorption for storage; the porous glass not only fixes graphene oxide to prevent graphene oxide from falling off, but also can be recycled.

Description

technical field [0001] The invention relates to the field of sewage treatment materials, in particular to layered double metal hydroxide microspheres used for sewage treatment and a preparation method. Background technique [0002] my country's water pollution is serious, especially heavy metals, arsenic, fluorine, and organic pollutants in water. Adopting effective water pollution control technologies is a major demand for protecting ecological environment safety and human health. However, the current water treatment process is costly and inefficient, making it difficult to effectively remove toxic pollutants. In particular, heavy metals contained in wastewater are a kind of permanent pollutants, persistent pollution, difficult to remove, and great harm, which has seriously threatened the normal life safety and quality of residents. Therefore, the treatment of heavy metal wastewater has become a major issue in the field of environmental protection in the world. [0003] C...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/205C02F1/281C02F1/283C02F2101/20C02F2101/22
Inventor 陈庆曾军堂
Owner LINYI UNIVERSITY
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