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Eggshell heavy metal ion adsorbent and preparation method thereof

A technology of heavy metal ions and adsorbents, which is applied in the fields of waste resource utilization and water treatment, can solve problems such as environmental pollution, and achieve the effects of avoiding environmental pollution, increasing contact area, and strong adsorption capacity.

Active Publication Date: 2012-09-12
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a kind of waste, eggshells are usually disposed of in landfills, which can easily cause serious environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Eggshells, which are wastes from food production and daily life, are taken for cleaning, and added to 20% NaOH solution for soaking for 2 to 3 days to remove the inner membrane of the eggshells. The eggshells are removed, washed and filtered, then dried in a drying oven. The eggshells from which the inner film has been removed are placed in a heat treatment furnace and calcined at 750° C. for 2 hours. After cooling, powder with a fineness of 80-100 mesh can be obtained, which is the eggshell heavy metal ion adsorbent.

[0017] At 25°C, 2.5 g of the eggshell heavy metal ion adsorbent prepared in this example was added to 1 liter of acidic industrial wastewater (pH=3), and the heavy metal ion Cd 2+ , Pb 2+ 、Cu 2+ 、Ni 2+ etc. are completely adsorbed, Cr 3+ and Cr 2+ The adsorption rate is 80%. At the same time, the acidic industrial wastewater is neutralized, and the pH value of the wastewater after adsorption treatment is 7.

Embodiment 2

[0019] Eggshells, which are wastes from food production and daily life, are taken for cleaning, and added to 20% NaOH solution for soaking for 2 to 3 days to remove the inner membrane of the eggshells. The eggshells are removed, washed and filtered, then dried in a drying oven. The eggshell with the inner film removed is placed in a heat treatment furnace and calcined at 1000°C for 3 hours. After cooling, a powder with a fineness of 60-75 mesh can be obtained, which is the eggshell heavy metal ion adsorbent.

[0020] At 25°C, 2.5 g of the eggshell heavy metal ion adsorbent prepared in this example was added to 1 liter of acidic industrial wastewater (pH=3), and the heavy metal ion Cd 2+ , Pb 2+ 、Cu 2+ 、Ni 2+ etc. are completely adsorbed, Cr 3+ and Cr 2+ The adsorption rate is 82.5%. At the same time, the acidic industrial wastewater is neutralized, and the pH value of the wastewater after adsorption treatment is 7.

Embodiment 3

[0022] Eggshells, which are wastes from food production and daily life, are taken for cleaning, and added to 20% NaOH solution for soaking for 2 to 3 days to remove the inner membrane of the eggshells. The eggshells are removed, washed and filtered, then dried in a drying oven. The eggshell with the inner film removed is placed in a heat treatment furnace and calcined at 1200°C for 4 hours. After cooling, a powder with a fineness of 40-55 mesh can be obtained, which is the eggshell heavy metal ion adsorbent.

[0023] At 25°C, 2 g of the eggshell heavy metal ion adsorbent prepared in this example was added to 1 liter of acidic industrial wastewater (pH=3), and the heavy metal ion Cd 2+ , Pb 2+ 、Cu 2+ 、Ni 2+ etc. are completely adsorbed, Cr 3+ and Cr 2+ The adsorption rate is 85%. At the same time, the acidic industrial wastewater is neutralized, and the pH value of the wastewater after adsorption treatment is 7.

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Abstract

The invention provides an eggshell heavy metal ion adsorbent and a preparation method thereof. The preparation method comprises the following steps: cleaning the concentrated eggshells, soaking the eggshells into NaOH solution with the concentration of 20 percent for 2 to 3 days, and removing intimas from the eggshells, taking out the eggshells, washing the eggshells completely, filtering and drying in a drying box; and placing the dried eggshells into a heat treatment furnace, calcining at the temperature ranging from 750 to 1,200 DEG C for 2 to 4 hours, and cooling to obtain the white powdered eggshell heavy ion adsorbent. The adsorbent has the power size of 40 to 100 meshes. The adsorbent is applicable to treatment on acidic industrial waste water with the pH value of 3 to 6, wherein the adding amount of the adsorbent is 2 to 2.5 g / L.

Description

technical field [0001] The invention belongs to the technical field of waste resource utilization and water treatment, and in particular relates to a natural mineral heavy metal ion adsorbent and a preparation method thereof. Background technique [0002] With the rapid development of mining, metal smelting, metal processing, electroplating, and electronic industries, the resulting heavy metal ions can enter water bodies through soil, water, and air. The harm of industrial wastewater to the natural environment is becoming more and more serious, especially through the enrichment through the food chain. As a class of toxic substances, trace amounts of heavy metals can produce toxic effects and cause irreversible harm to human health. How to eliminate the pollution of soil and water resources caused by heavy metal ions has become an urgent problem to be solved in environmental protection. The currently widely used heavy metal adsorbents have limited sources, high cost, and co...

Claims

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Application Information

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IPC IPC(8): B01J20/24C02F1/28
Inventor 田如锦
Owner DALIAN JIAOTONG UNIVERSITY
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