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Application of longan shell in adsorbing heavy metal ion and method for adsorbing heavy metal ion with longan shell

A technology for adsorbing heavy metals and heavy metal ions, which is applied in chemical instruments and methods, water/sludge/sewage treatment, and other chemical processes. It can solve the problem of no longer obvious advantage of cheap raw materials, cumbersome pretreatment process, and long adsorption time. and other problems, to achieve the effect of simple and easy pretreatment, fast adsorption rate and low cost

Inactive Publication Date: 2010-06-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Of course, the adsorption performance of chitosan to heavy metal ions can be greatly improved after cross-linking or chemical modification, but the cost input brought by the modification process makes the cheap advantage of the raw material itself no longer obvious, and also makes the adsorption of natural polymer heavy metal ions more difficult. Adsorbents have lost the most fundamental advantage that they can compete with synthetic adsorbents for the market
[0005] In summary, it can be found that the current natural heavy metal ion adsorbents have problems such as cumbersome pretreatment process, relatively long adsorption time, and low adsorption rate. However, to find a low-cost, simple pretreatment, high adsorption rate, and the ability to simultaneously adsorb multiple A natural heavy metal ion adsorbent for heavy metal ions is very important

Method used

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  • Application of longan shell in adsorbing heavy metal ion and method for adsorbing heavy metal ion with longan shell
  • Application of longan shell in adsorbing heavy metal ion and method for adsorbing heavy metal ion with longan shell
  • Application of longan shell in adsorbing heavy metal ion and method for adsorbing heavy metal ion with longan shell

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Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0033] Take 50 mg of longan shell and put it into 25 mL of lead nitrate solution at 30°C with an initial concentration of 200 mg / L, stirring and adsorbing for 2 hours. After filtering with filter paper, the residual lead ion content in the filtrate was titrated by EDTA complexometric titration. The adsorption rate was 46.9%, and the adsorption capacity was 46.9 mg / g. Under the same conditions, changing the amount of adsorbent for 100 mg, 200 mg, 300 mg, and 400 mg, respectively, the adsorption rates were 59.4%, 81.2%, 83.3%, and 83.3%, and the adsorption capacities were 29.7 mg / g, 20.3 mg / g, 13.9mg / g, 13.9mg / g.

[0034] Therefore, the longan shell can be used to adsorb lead ions with an initial lead ion concentration of 200 mg / L. When the dosage of the longan shell is 300 mg, the adsorption rate reaches the maximum value of 83.3%.

Embodiment 6～13

[0036] Take 300 mg of longan shells and put them into 25 mL of lead nitrate solution at 30 °C with an initial concentration of 200 mg / L, stirring and adsorbing for 3 minutes. After filtering with filter paper, the residual lead ion content in the filtrate was titrated by EDTA complexometric titration. The adsorption rate was 65.8%, and the adsorption capacity was 11.0 mg / g. Under the same conditions, changing the adsorption time to 5 minutes, 10 minutes, 20 minutes, 30 minutes, 60 minutes, 120 minutes, and 180 minutes, respectively, the obtained adsorption rates were 72.4%, 75.0%, 77.0%, 78.6%, 80.6%, 83.3% and 83.2%, and the adsorption capacities were 11.0 mg / g, 12.1 mg / g, 12.5 mg / g, 12.8 mg / g, 13.1 mg / g, 13.9 mg / g and 13.9 mg / g, respectively.

[0037] Therefore, it can be obtained that the equilibrium adsorption time of longan shell adsorbing lead ions with an initial lead ion concentration of 200 mg / L is 120 minutes.

Embodiment 14～15

[0039] Take 300 mg of longan shell and put it into 25 mL of lead nitrate solution at 30°C with an initial concentration of 50 mg / L, stirring and adsorbing for 2 hours. After filtering with filter paper, the residual lead ion content in the filtrate was titrated by EDTA complexometric titration. The adsorption rate was 86.7%, and the adsorption capacity was 3.6 mg / g. Under the same conditions, the initial concentration of the treated lead nitrate solution was changed to 20 mg / L, and the residual lead ion content in the filtrate was detected by inductively coupled plasma emission spectrometry (ICP). 1.5mg / g.

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Abstract

The invention discloses the application of a longan shell in the heavy metal ion adsorption. The application has the beneficial effects that the longan shell is waste material, so the application belongs to the waste utilization, and the cost is very low. Meanwhile, in the same type sorbent, the pretreatment of the longan shell is very simple and easy without the special treatment process.

Description

technical field [0001] Application of longan shell in adsorbing heavy metal ions and method for adsorbing heavy metal ions using longan shell Background technique [0002] With the rapid development of industrialization, heavy metals, as one of the indispensable materials for industrial production, play an increasingly important role in human production and life. However, most of them have major hazards to human beings and the ecological environment. For example, metals such as mercury, lead, and chromium are very harmful to organisms, and may enter the human body through the enrichment of the food chain. Therefore, harmful metal pollution has become a hot issue of global concern. At present, there are many ways to control harmful metal pollution. In recent years, adsorbent adsorption method has received more and more attention due to its low cost and high efficiency. Among many adsorbents, natural adsorbents are favored by people because of their abundant raw material so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/24B01J20/22C02F1/62C02F1/58
Inventor 黄美荣李舒李新贵
Owner TONGJI UNIV
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