Rare earth elements contained laminated dihydroxy composite metal oxide, and preparation method and application thereof

A layered double hydroxyl, rare earth element technology, applied in copper compounds, chemical instruments and methods, inorganic chemistry and other directions, to achieve the effects of effective removal, high utilization efficiency and convenient preparation

Inactive Publication Date: 2013-02-13
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional LDHs are composed of divalent magnesium ions and trivalent aluminum ions. So far, there are no related research rep

Method used

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  • Rare earth elements contained laminated dihydroxy composite metal oxide, and preparation method and application thereof
  • Rare earth elements contained laminated dihydroxy composite metal oxide, and preparation method and application thereof

Examples

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Example Embodiment

[0024] Example 1:

[0025] like Figure 1-2 As shown, a method for preparing a layered double-hydroxyl composite metal oxide containing rare earth elements, and the application of the layered double-hydroxyl composite metal oxide containing rare earth elements for adsorption and removal of arsenic, the steps are as follows:

[0026] (1) Prepare 100ml of solution 1, and solution 1 contains Cu 2+ , Mg 2+ , Fe 3+ , La 3+ , where Cu 2+ The concentration is 20mmol·L -1 , Mg 2+ The concentration is 60mmol·L -1 , Fe 3+ The concentration is 20mmol·L -1 , La 3+ The concentration is 20mmol·L -1 ;Add 100ml of solution 2, the solution 2 contains Na 2 CO 3 and NaOH, Na 2 CO 3 The concentration is 400mmol·L -1 , the concentration of NaOH is 400 mmol·L -1 .

[0027] (2) The above-mentioned configured solution 1 and solution 2 are added dropwise to a beaker containing 100ml of deionized water at a certain speed, vigorous stirring is performed during the dropping process, and...

Example Embodiment

[0030] Example 2:

[0031] (1) Prepare 50ml of solution 1, and solution 1 contains Cu 2+ , Mg 2+ , Fe 3+ and La 3+ , where Cu 2+ The concentration is 500mmol·L -1 , Mg 2+ The concentration is 500mmol·L -1 , Fe 3+ The concentration is 500mmol·L -1 , La 3+ The concentration is 500mmol·L -1 ;Add 50ml of solution 2, the solution 2 contains Na 2 CO 3 and NaOH, Na 2 CO 3 The concentration of 2000mmol·L -1 , the concentration of NaOH is 2000 mmol·L -1 .

[0032] (2) The above-mentioned configured solution 1 and solution 2 were added dropwise to a beaker containing 200ml of deionized water at a certain speed, and the beaker was vigorously stirred during the dropwise addition, and the pH value of the reaction process was controlled to be maintained at about 10.

[0033] (3) The reacted solution was aged at 35° C., centrifuged, and washed repeatedly with deionized water until the pH value of the supernatant became neutral. Dry at 120°C and grind into powder with a mort...

Example Embodiment

[0035] Example 3

[0036] A method for preparing a layered double-hydroxyl composite metal oxide containing rare earth elements, characterized in that the method comprises the following steps:

[0037] (1) Preparation of solution

[0038] The Cu(NO 3 ) 2 , Mg(NO 3 ) 2 , Fe(NO 3 ) 3 and La(NO 3 ) 3 Dissolved in deionized water to prepare solution 1, Cu in solution 1 2+The concentration is 100mmol·L -1 , Mg 2+ The concentration is 20mmol·L -1 , Fe 3+ The concentration is 30mmol·L -1 , La 3+ The concentration is 30mmol·L -1 ; take Na 2 CO 3 and NaOH dissolved in deionized water to prepare solution 2, which contains Na 2 CO 3 and NaOH concentrations of 800 mmol·L -1 ;

[0039] (2) Synthesis process

[0040] Mix solution 1 and solution 2 with each other into deionized water to make Cu 2+ , Mg 2+ , Fe 3+ , La 3+ The sum of the amounts of the four metal ion species and Na 2 CO 3 The ratio with the sum of the amount of NaOH substance is 0.1:1, and the react...

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Abstract

The invention relates to a rare earth elements contained laminated dihydroxy composite metal oxide, and a preparation method and an application thereof. The rare earth elements contained laminated dihydroxy composite metal oxide is synthesized through treating a salt containing metal elements comprising La, Cu, Mg and Fe as a raw material, and is used for adsorbing and removing As in water. The preparation method comprises the following technological steps: preparing a solution 1 containing certain concentrations of La, Cu, Mg and Fe, and preparing a solution 2 containing certain concentrations of sodium hydroxide and sodium carbonate; adding the solution 1 and the solution 2 into a beaker containing a certain amount of deionized water at certain speeds in a dropwise manner while stirring; and ageing a solution obtained after a reaction and containing a precipitate at a certain temperature for a period of time, centrifuging, repeatedly flushing the precipitate with deionized water until the supernatant is neutral, and drying to obtain the rare earth element contained laminated dihydroxy composite metal oxide which is an adsorbent product. Compared with products in the prior art, the product provided by the invention can realize the effective treatment and purification of the water polluted by As, and has the advantages of high utilization rate, low cost and the like.

Description

technical field [0001] The invention belongs to the technical field of treatment of arsenic and heavy metal pollution in water, and relates to the use of chemical reagents to synthesize a layered double hydroxyl compound metal oxide containing copper, magnesium, iron and rare earth elements as an adsorbent, and to apply it to arsenic in water and the removal of heavy metal ions to achieve the purification of polluted water. Background technique [0002] The harm of arsenic pollution to human health is a worldwide problem. At present, arsenic pollution incidents in large areas have occurred in more than a dozen countries in the world. my country is one of the countries with serious pollution in this area. Arsenic pollution has always affected the safety of drinking water for rural residents in Northwest China and other places. At present, the removal methods of arsenic in water include coagulation, co-precipitation, membrane separation, adsorption and so on. The adsorption ...

Claims

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Application Information

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IPC IPC(8): C01G3/00B01J20/06B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 朱志良郭艳微仇雁翎
Owner TONGJI UNIV
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