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Natural adsorbent for removing heavy metal ions in water and preparation method and application thereof

A technology of heavy metal ions and adsorbents, applied in chemical instruments and methods, adsorption of water/sewage treatment, water pollutants, etc., to achieve economic and environmental protection sources, conducive to mass production, and low ecological risk

Inactive Publication Date: 2010-04-07
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the idea of ​​using its excellent pore structure to prepare heavy metal ion adsorption materials has not been reported yet.

Method used

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  • Natural adsorbent for removing heavy metal ions in water and preparation method and application thereof
  • Natural adsorbent for removing heavy metal ions in water and preparation method and application thereof
  • Natural adsorbent for removing heavy metal ions in water and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0024] 1) shell cleaning: remove the dirt (sludge and attached organisms) and residual carrion on the shell surface with clean water;

[0025] 2) Drying at low temperature: drying the cleaned shells at 80-90°C for 12 hours;

[0026] 3) Coarse crushing: Preliminary crushing of the dried shells by a crusher;

[0027] 4) Fine crushing: the coarsely crushed shells are pulverized and ground with a ball mill, and the particle size is controlled to be 200-400 mesh to obtain the shell powder adsorbent.

Embodiment 2

[0029] Aqueous solutions with lead ion concentrations of 50-500 mg / l are used as water to be treated. Adjust the pH of the treated water to 5.3±0.1. Add 0.06 g of the prepared shell powder adsorbent to 200 mL of the treated water, shake at 25° C. for 24 h (adsorption reaches equilibrium). According to the concentration of lead ions in the treated water after equilibrium, the highest adsorption capacity of lead ions under this condition can reach 555.6 mg / g (attached figure 1 ).

Embodiment 3

[0031] An aqueous solution with a cadmium ion concentration of 10-300 mg / L is used as the water to be treated. Adjust the pH of the treated water to 5.3±0.1. Add 0.06 g of the prepared shell powder adsorbent to 100 mL of the treated water, shake at 25° C. for 24 h (adsorption reaches equilibrium). According to the concentration of cadmium ions in the treated water after equilibrium, the highest adsorption capacity of cadmium ions under this condition can reach 204.1 mg / g (attached figure 2 ).

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Abstract

The invention relates to natural adsorbent for removing heavy metal ions in water and the preparation method and the application thereof, belonging to the filed of the water treatment technology and the application thereof. The preparation method and the application of the natural adsorbent for removing heavy metal ions in water comprises the following steps: cleaning shells and removing the dirt on the surfaces of the shells and the residual carrion; baking the cleaned shells dry; crushing preliminarily the shells by a crusher; and grinding the crushed shells with a ball grinder to obtain the shell powder adsorbent. The natural adsorbent prepared by the raw material of the shells has the characteristics of strong adsorption capacity and is economical and environmental friendly, and the sources of shells are enough.

Description

technical field [0001] The invention relates to water treatment technology and application, in particular to a natural adsorbent for removing heavy metal ions in water, a preparation method and application thereof. Background technique [0002] With the development of society, especially the acceleration of industrialization, a serious problem that follows is that more and more heavy metals enter natural water bodies through various channels such as industrial sewage and atmospheric deposition, and natural water bodies are polluted by heavy metals to varying degrees. . Because heavy metals cannot be degraded naturally, they can easily enter the human body through the food chain and seriously endanger human health. Therefore, heavy metal pollution in water bodies has attracted more and more attention. [0003] Traditional heavy metal-polluted wastewater treatment technologies include precipitation, ion exchange, electrochemical and activated carbon adsorption. These methods...

Claims

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Application Information

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IPC IPC(8): B01J20/02B01J20/30C02F1/28C02F1/62C02F101/20C02F101/22
Inventor 祝凌燕杜洋
Owner NANKAI UNIV
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