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Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt

A technology of heavy metal ions and kaolin, applied in non-metallic elements, chemical instruments and methods, silicates and other directions, can solve the problems of affecting the adsorption performance of heavy metals, large particle size, poor dispersibility, etc., and achieves increased adsorption capacity, convenient and simple preparation. , The effect of low preparation cost

Active Publication Date: 2013-09-25
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Magnesium-aluminum basic salt has a certain ability to adsorb heavy metals, but it is a water-insoluble crystalline substance with large particle size and poor dispersion, and cannot be suspended and dispersed in the liquid phase solution, which affects its adsorption performance for heavy metals

Method used

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  • Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt
  • Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt
  • Method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt

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Embodiment 1

[0030] Embodiment 1: the preparation of heavy metal ion adsorbent of the present invention

[0031] Weigh 15g of kaolin, with Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O separately prepared Mg 2+ 、Al 3+ The molar concentration is 0.75mol L -1 , 0.25mol·L -1 For each 100mL solution, weigh 3g NH 4 HCO 3 ; kaolin, magnesium aluminum solution, NH 4 HCO 3 After the solution is fully mixed, place it on a magnetic stirrer and stir evenly, and slowly add 1mol·L -1 Na 2 CO3 Solution until the pH value of the mixed solution is 8.0; then put it in a constant temperature water bath for 24 hours (aging temperature 60°C), and then filter the supernatant; finally move the filtered mixture into a constant temperature of 120°C Dry in an oven for 24 hours; after natural cooling, grind to powder and pass through a 100-mesh sieve to obtain a heavy metal ion adsorbent.

Embodiment 2

[0032] Embodiment 2: the preparation of heavy metal ion adsorbent of the present invention

[0033] Weigh 14g of kaolin, with Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O separately prepared Mg 2+ 、Al 3+ The molar concentration is 0.7mol L -1 , 0.20mol·L -1 For each 100mL solution, weigh 3g NH 4 HCO 3 ; kaolin, magnesium aluminum solution, NH 4 HCO 3 After the solution is fully mixed, place it on a magnetic stirrer and stir evenly, and slowly add 1mol·L -1 Na 2 CO 3 Solution until the pH value of the mixed solution is 7.8; then put it in a constant temperature water bath and let it stand for 12 hours (aging temperature 50°C), then filter the supernatant; finally move the filtered mixture into a constant temperature of 110°C Dry in an oven for 25 hours; after natural cooling, grind to powder and pass through a 100-mesh sieve to obtain a heavy metal ion adsorbent.

Embodiment 3

[0034] Embodiment 3: the preparation of heavy metal ion adsorbent of the present invention

[0035] Weigh 9g of kaolin, with Mg(NO 3 ) 2 ·6H 2 O and Al(NO 3 ) 3 9H 2 O separately prepared Mg 2+ 、Al 3+ The molar concentration is 0.6mol L -1 , 0.20mol·L -1 For each 100mL solution, weigh 3g NH 4 HCO 3 ; kaolin, magnesium aluminum solution, NH 4 HCO 3 After the solution is fully mixed, place it on a magnetic stirrer and stir evenly, and slowly add 1mol·L -1 Na 2 CO 3 Solution until the pH value of the mixed solution is 7.5; then put it in a constant temperature water bath and let it stand for 24 hours (aging temperature 70°C), then filter the supernatant; finally move the filtered mixture into a constant temperature of 115°C Dry in an oven for 22 hours; after natural cooling, grind to powder and pass through a 100-mesh sieve to obtain a heavy metal ion adsorbent.

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Abstract

The invention provides a method for preparing modified kaolin heavy metal ion adsorbent by using magnalium basic salt. The method comprises the following steps of: 1) mixing the kaolin, magnalium solution and NH4HCO3 solution according to a mass ratio of (3-5):(6-10):1 and uniformly stirring, meanwhile, and dropwise adding Na2CO3 to adjust pH value to be 7.5-8.5 to obtain mixed liquid; 2) filling the mixed liquid in a constant-temperature water bath, standing and aging at the temperature of 50-70 DEG C for 12-14 hours, and filtering off supernatant to obtain mixture; and 3) drying the mixture, cooling and then grinding into powder. The method for preparing the heavy metal ion adsorbent is simple, low in preparation cost and suitable for industrial production; in addition, as shown by an early experiment, the adsorbent prepared through modification of the invention has obviously increased adsorption quantity to heavy metal ion, which is about 2-10 times that of the original kaolin; the adsorption effect is minimally influenced by the pH value; and the method is suitable for treatment of heavy metal-containing wastewater of different pH values produced in an actual industrial production process.

Description

technical field [0001] The present invention relates to a kind of preparation method of adsorbent, further refers to utilizing magnesium aluminum basic salt ([Mg 0.25 Al 0.75 (OH) 2 ] 0.75+ (NO 3 - ) 0.75 mH 2 O) A method for preparing a heavy gold ion adsorbent by modifying kaolin. Background technique [0002] With the development of mining, electroplating, chemical industry, tanning, smelting and other industries, the discharge of a large amount of industrial wastewater without proper treatment has led to aggravation of heavy metal pollution in water. Because heavy metals are not easy to decompose and destroy by physical, chemical or biological methods, but can only transfer their existing positions or change their physical and chemical forms, and they are enriched, they are extremely harmful to the ecological environment and human health. In this regard, various water quality standards promulgated by various countries in the world have put forward strict restrict...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/16
Inventor 施周邓林陈世洋罗璐
Owner HUNAN UNIV
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