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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] Example 1

[0028] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 18 mol of calcium chloride with an aqueous solution containing 6 mol of ferric chloride, add N-methylpyrrolidone dispersant and 7.5 mol (molar amount) Graphene (calculated by carbon), add 0.2mol urea precipitant, and hydrothermally react at 140 degrees Celsius for 5 days to obtain graphene-containing iron-calcium layered bimetallic hydroxide. After cooling, it is centrifuged and washed to pH 7.0 with alcohol. Wash twice and dry; (2) Fixation of graphene-containing iron-calcium layered double metal hydroxide: Combine the graphene-containing iron-calcium layered double hydroxide after step (1) drying with 300g The molten waste glass is collided with a spray method to form microspheres of layered double metal hydroxide fixed by microporous glass.

[0029] Take 200g of prepared microspheres of layered bimetallic hydroxide fixed by microporous glass into 10L of an aqueous solution wit...

Example Embodiment

[0030] Example 2

[0031] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 15 mol of calcium chloride with an aqueous solution containing 6 mol of iron sulfate, add N-methylpyrrolidone dispersant and 7.5 mol (molar amount to Carbon meter), add 0.2mol of urea precipitant and hydrothermally react at 150 degrees Celsius for 4 days to obtain graphene-containing iron-calcium layered bimetallic hydroxide. After cooling, it is centrifuged, washed with water to pH 7.0, and washed with alcohol. 2 times, drying; (2) Fixation of graphene-containing iron-calcium layered double metal hydroxide: melt the dried graphene-containing iron-calcium layered double hydroxide of step (1) with 300g The waste glass is sprayed to form microspheres of layered double metal hydroxide fixed by microporous glass.

[0032] Take 200g of prepared microspheres of layered bimetallic hydroxide fixed by microporous glass into 10L of an aqueous solution with a lead content of 0.5mg / L, a merc...

Example Embodiment

[0033] Example 3

[0034] (1) Preparation of iron-calcium layered double metal hydroxide: After mixing 18 mol of calcium chloride with an aqueous solution containing 6 mol of ferric chloride, add N-methylpyrrolidone dispersant and 7.5 mol (molar amount) Graphene (calculated by carbon), add 0.2mol hexamethylenetetramine precipitant, hydrothermally react at 155 degrees Celsius for 4 days to obtain graphene-containing iron-calcium layered bimetallic hydroxide. After cooling, centrifuge and wash until pH7.0, washed twice with alcohol, and dried; (2) Fixation of graphene-containing iron-calcium layered bimetallic hydroxide: Step (1) dried graphene-containing iron-calcium layered bimetal The hydroxide and 300 g of molten waste glass are collided with a spray method to form microspheres of layered double hydroxide fixed by microporous glass.

[0035] Take 200g of prepared microspheres of layered bimetallic hydroxide fixed by microporous glass into 10L of an aqueous solution with a lead c...

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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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