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Ethylenediamine tetraacetic acid modified diatomite adsorbent as well as preparation method and application thereof to treatment of heavy metal ions in wastewater

A technology of ethylenediaminetetraacetic acid and diatomite, which is applied in the field of water treatment, can solve the problems of refractory biodegradation, severe toxicity or carcinogenicity of heavy metal pollutants, and achieve high adsorption efficiency, convenient raw material acquisition, and strong adsorption capacity Effect

Active Publication Date: 2017-11-24
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of pollutants are discharged into the water environment, among which heavy metal pollutants are highly toxic or carcinogenic and difficult to biodegrade

Method used

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  • Ethylenediamine tetraacetic acid modified diatomite adsorbent as well as preparation method and application thereof to treatment of heavy metal ions in wastewater
  • Ethylenediamine tetraacetic acid modified diatomite adsorbent as well as preparation method and application thereof to treatment of heavy metal ions in wastewater
  • Ethylenediamine tetraacetic acid modified diatomite adsorbent as well as preparation method and application thereof to treatment of heavy metal ions in wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of modified diatomite adsorbent is:

[0020] (1) Pretreatment of waste diatomaceous earth in breweries:

[0021] Soak the waste diatomite from the brewery in 3M NaOH solution, stir for 30 minutes, and centrifuge to obtain the waste diatomite treated with NaOH solution; then soak the waste diatomite treated with NaOH solution in 3M hydrochloric acid solution , after stirring for 30 minutes, centrifuge; then wash with distilled water several times until the washing liquid reaches neutrality. Then bake it in an oven at 120° C. for 12 hours to obtain pretreated waste diatomaceous earth from a brewery.

[0022] (2) Modification of diatomite:

[0023] Get the EDTA of 3.6g urea and 0.7g and put into successively in the flask that fills 30ml ethylene glycol, and add 1.8g through step (1) the brewery waste diatomite powder of pretreatment, under 50 ℃ in magnetic stirrer Stir for 30 minutes. Then the mixture was placed in an autoclave, heated at 200 °C ...

Embodiment 2

[0027] The preparation method of modified diatomite adsorbent is:

[0028] (1) Pretreatment of waste diatomaceous earth in breweries:

[0029] Soak the waste diatomaceous earth from the brewery in 2M NaOH solution, stir for 20 minutes, and centrifuge to obtain the waste diatomite treated with NaOH solution; then soak the waste diatomite treated with NaOH solution in 4M hydrochloric acid solution , after stirring for 20 minutes, centrifuge; then wash with distilled water several times until the washing liquid reaches neutrality. Then bake it in an oven at 120° C. for 12 hours to obtain pretreated waste diatomaceous earth from a brewery.

[0030] (2) Modification of diatomite:

[0031] Get the EDTA of 2.8g urea and 0.7g and put into successively in the flask that fills 30ml ethylene glycol, and add 1.9g through step (1) pretreated brewery waste diatomite powder, under 40 ℃ in the magnetic stirrer Stir for 30 minutes. Then the mixture was placed in an autoclave, heated at 160...

Embodiment 3

[0035] The preparation method of modified diatomite adsorbent is:

[0036] (1) Pretreatment of waste diatomaceous earth in breweries:

[0037] Soak the waste diatomite from the brewery in 4M KOH solution, stir for 20 minutes, and centrifuge to obtain the waste diatomite treated with KOH solution; then soak the waste diatomite treated with KOH solution in 2M hydrochloric acid solution , after stirring for 20 minutes, centrifuge; then wash with distilled water several times until the washing liquid reaches neutrality. Then bake it in an oven at 120° C. for 12 hours to obtain pretreated waste diatomaceous earth from a brewery.

[0038] (2) Modification of diatomite:

[0039] Get the EDTA of 4.2g urea and 0.7g and put into the flask that fills 30ml ethylene glycol successively, and add 1.7g through step (1) pretreated brewery waste diatomite powder, under 60 ℃ in magnetic stirrer Stir for 20 minutes. Then the mixture was placed in an autoclave, heated at 160 °C for 6 h, and th...

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Abstract

The invention discloses a preparation method of a modified diatomite adsorbent. The preparation method comprises the following steps: 1) pre-treating diatomite: immersing the diatomite into an alkali solution and an acid solution respectively and carrying out stirring treatment; then washing the diatomite with water until the diatomite is neutral, drying; 2) mixing urea, ethylenediamine tetraacetic acid and the diatomite treated by step 1) in an organic solvent; stirring at 40 DEG C to 60 DEG C for 20min to 30min; then putting an obtained mixture into a reaction kettle and carrying out heating reaction at 160 DEG C to 200 DEG C for 6h to 8h; cooling to room temperature, washing and drying. The invention further discloses the ethylenediamine tetraacetic acid modified diatomite adsorbent and application thereof to adsorption of heavy metal ions in wastewater. The ethylenediamine tetraacetic acid modified diatomite adsorbent takes waste diatomite of a beer factory as a raw material; the price is low and the raw material is convenient to obtain; a modified material has no dangers and no pollution; a whole operation process is simple and the obtained adsorbent has a strong adsorption capability and has relatively high adsorption and removal efficiency on hexavalent chromium and divalent nickel in the wastewater; no other pollutants are produced in a whole adsorption and removal process.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to an ethylenediaminetetraacetic acid-modified diatomite (EDTA-diatomite waste, EDTA-DW) adsorbent, a preparation method thereof and an application for treating heavy metal ions in waste water. Background technique [0002] With the rapid development of industrial production and human society, the problem of environmental pollution has become increasingly serious. A large number of pollutants are discharged into the water environment, among which heavy metal pollutants are highly toxic or carcinogenic and difficult to biodegrade. In addition, heavy metal pollutants are easy to accumulate in organisms and then accumulate in organisms or humans through the food chain. [0003] In view of the harmfulness of chromium and nickel / and its wide application in various industrial production and manufacturing processes, it is of great significance to effectively remove chromium and ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/14B01J20/30C02F1/28C02F1/62C02F101/22
CPCB01J20/14B01J20/22B01J20/3085B01J2220/4887C02F1/288C02F1/62C02F2101/22
Inventor 吴云海张冰沙海涛
Owner HOHAI UNIV
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