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Preparation and application of layered double hydroxides with diethylenetriaminepentaacetic acid intercalation

A technology of diethylenetriaminepentaacetic acid and hydroxide, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problems of biomass reduction, plant root activity, and chlorophyll content decline, achieving low consumption and low cost , the effect of simple use

Inactive Publication Date: 2011-03-30
AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that diethylenetriaminepentaacetic acid (DTPA) can inhibit the growth of plants, reduce their biomass and chlorophyll content, and reduce the root activity of plants, so there are certain risks and hazards when used alone

Method used

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  • Preparation and application of layered double hydroxides with diethylenetriaminepentaacetic acid intercalation
  • Preparation and application of layered double hydroxides with diethylenetriaminepentaacetic acid intercalation
  • Preparation and application of layered double hydroxides with diethylenetriaminepentaacetic acid intercalation

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Embodiment 1

[0026] Embodiment 1: Preparation of Mg-Al-DTPA LDH

[0027] Weigh 135.63g MgCl 2 ·6H 2 O and 80.48g AlCl 3 ·6H 2 0, dissolved in 2000ml deionized water under agitation; take 32.45g DTPA, add 37ml weight percent concentration and be 25% ammonia solution, mix for subsequent use; measure 210ml 25% ammoniacal water, add 840ml deionized water to dilute for subsequent use; Under the condition of vigorous stirring, add the prepared DTPA solution and ammonia solution into the mixed salt solution, stir vigorously for 20 minutes and then leave it to age for 60 minutes; transfer the mixed solution to a Buchner funnel, rinse it repeatedly with deionized water and Suction filter 8 times to remove excess ammonia water, collect the gel filter cake in the Buchner funnel into a jar, place in an oven at a constant temperature of 80°C, take out the gel in the jar after 24 hours, dry at 65°C, and grind After that, the diethylenetriaminepentaacetic acid-intercalated layered double metal hydrox...

Embodiment 2

[0028] Embodiment 2: Mg-Al-DTPA LDH adsorption aqueous solution Pb 2+ Applications

[0029] Configure a series of different Pb 2+ Concentration of the solution as the working solution, respectively measure 50ml and put it in a 100ml centrifuge tube, weigh 0.05g of Mg-Al-DTPA LDH and add the added Pb 2+ In the centrifuge tube contaminated with the working solution, the ratio of Mg-Al-DTPA LDH to the dirty solution is 1g / L, shake at constant temperature for 12 hours, take the supernatant after high-speed centrifugation, and measure the Pb in the solution with an atomic absorption spectrophotometer 2+ Concentration, according to Pb in the working solution 2+ The concentration difference before and after the concentration was used to calculate the adsorption amount of Mg-Al-DTPA LDH.

[0030] The results show that: Mg-Al-DTPA LDH has a good adsorption effect on Pb pollution in the solution, such as figure 2 As shown, its adsorption isotherm conforms to Freundlich adsorption i...

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Abstract

The invention provides a preparation method of layered double hydroxides (LDHs) with diethylenetriaminepentaacetic acid (DTPA) intercalation, wherein, Mg-Al LDH is taken as a matrix, and DTPA is introduced into positive charge of a layer balance Mg-Al LDH laminate panel by a coprecipitation method. The preparation method comprises the following steps: dissolving magnesium chloride hexahydrate and aluminum chloride hexahydrate into water to obtain solution A; dissolving the DTPA into ammonia water to obtain solution B; diluting ammonia water with water to obtain solution C; mixing and stirring the three types of solution, keeping standing and aging; and washing and filtering the obtained mixed solution, collecting a gel filter cake, drying the filter cake at constant temperature, and grinding to obtain the product, wherein, the product can be used as a heavy metal adsorbing material. The invention has the advantages that the adsorbing material contains a large quantity of active functional groups, thus having good adsorbing effect; the adsorbing material can obtain better effect with less consumption when in use and has low cost and no pollution; and the adsorbing material is mainly applied to repairing a heavy metal polluted water body and has obvious effect on combined pollution caused by a plurality of heavy metal elements such as lead, cadmium and the like.

Description

technical field [0001] The invention relates to a preparation technology of a heavy metal adsorption material, in particular to a preparation method of a diethylenetriaminepentaacetic acid intercalated layered double metal hydroxide and its application as a heavy metal adsorption material. Background technique [0002] Heavy metals generally exist in nature in natural concentrations. With the development of industrial and agricultural production, a large amount of heavy metals are discharged into the environment. According to incomplete statistics, the world currently emits about 15,000 tons of mercury, about 3.4 million tons of copper, about 5 million tons of lead, about 15 million tons of manganese, and about 1 million tons of nickel, etc., which make the concentration of heavy metals in many areas significantly high. on the background value. After entering the environment, heavy metals cannot be biodegraded, but often participate in the food chain cycle, and eventually a...

Claims

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Application Information

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IPC IPC(8): C01F7/02
Inventor 梁学峰徐应明王林孙约兵臧运波孙扬秦旭
Owner AGRO ENVIRONMENTAL PROTECTION INST OF MIN OF AGRI
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