Preparation method of novel lead removal agent

A technology for removing lead and lead ions, which is applied in chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc. Chitosan's small adsorption capacity and other problems, to achieve excellent chelation and adsorption performance, excellent adsorption and chelation performance, to achieve the effect of treatment and resource utilization

Inactive Publication Date: 2014-11-05
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have achieved certain results for heavy metal wastewater with different characteristics, but there are also some shortcomings: for example, the most commonly used chemical precipitation method will produce a large amount of sludge, which is difficult to handle and easily causes secondary pollution. The chemical precipitation method has the disadvantages of large area, small treatment capacity, and poor selectivity; the electrolysis method consumes a lot of electricity and treats a small amount of wastewater; it is difficult to use liquid membrane technology, and there are few types of surfactants used to prepare emulsified liquid membranes. The performance is poor and the demulsification technology is not good enough; the adsorption method is an effective method to deal with heavy metal pollution. Compared with other methods, the adsorption method has the advantages of simple operation, loose treatment conditions, good treatment effect, and no secondary pollution, etc. Advantages, has a wide range of application prospects
However, chitosan has disadvantages such as small adsorption capacity, difficult separation and poor selectivity, which limit its popularization and application to some extent.

Method used

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  • Preparation method of novel lead removal agent
  • Preparation method of novel lead removal agent
  • Preparation method of novel lead removal agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Adsorb lead ions with chitosan, mechanically stir at room temperature for 12 hours, wash with water until neutral, desorb with nitric acid for 1-24 hours, wash with water until there is no Pb in the washing solution 2+ Detected, alkalized for 1-24h, then washed successively with absolute ethanol and anhydrous ether, and vacuum-dried at room temperature to obtain lead ion-imprinted chitosan.

[0027] (2) Add 1.0 g of lead ion-imprinted chitosan into 50 mL, 2% acetic acid solution to dissolve to make 2% lead ion-imprinted chitosan solution, and then add 50% pentamethylene glycol in a mass ratio of 1:2 Aldehyde was used as a cross-linking agent, mechanically stirred at room temperature for 2 hours, then the solid was treated with 0.1mol / L HCl solution, then soaked in 0.1mol / L NaOH solution, filtered and washed until neutral, washed with absolute ethanol, anhydrous Washed with ether successively, dried under vacuum at room temperature, and ground into powder to obtain c...

Embodiment 2

[0032] (1) Adsorb lead nitrate solution with chitosan, mechanically stir at room temperature for 12 hours, wash with water until neutral, desorb with nitric acid for 1-24 hours, wash with water until there is no Pb in the washing solution 2+ Detected, alkalized for 1-24h, then washed successively with absolute ethanol and anhydrous ether, and vacuum-dried at room temperature to obtain lead ion-imprinted chitosan.

[0033](2) Add 2.0 g of lead ion-imprinted chitosan to 100 mL, 2% acetic acid solution to dissolve, and make 2% lead ion-imprinted chitosan solution, and then add 50% pentamethylene glycol in a mass ratio of 1:2 Aldehyde was used as a cross-linking agent, mechanically stirred at room temperature for 2 hours, then the solid was treated with 0.1mol / L HCl solution, then soaked in 0.1mol / L NaOH solution, filtered and washed until neutral, washed with absolute ethanol, anhydrous Washed with ether in turn, dried in vacuum at room temperature to obtain cross-linked imprinte...

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Abstract

The invention provides a preparation method of a novel lead removal agent. The method comprises the following steps of: blotting chitosan by using lead ions; forming through crosslinking by using glutaraldehyde after the blotting is ended to obtain lead ion blotted chitosan spherules; forming through crosslinking the lead ion blotted chitosan spherules and Fe3O4 nanoparticles by using glutaraldehyde to prepare magnetic crosslinked blotted chitosan, wherein the Fe3O4 nanoparticles are prepared by using a co-precipitation method; and finally, modifying by using sulfourea to prepare a finished product. The lead removal agent has better absorption and chelation effects on Pb<2+> and good in separation performance; the absorption performance of the novel lead removal agent is not remarkably lowered after the novel lead removal agent is recycled over ten times; and the novel lead removal agent is used for treating lead-contained wastewater so that not only can the wastewater be discharged to be up to the standard, but also lead ions in water can be recycled.

Description

technical field [0001] The invention relates to a novel chitosan-based chelating adsorbent, in particular to a preparation method of a novel lead removing agent. Background technique [0002] Lead, mercury, cadmium, chromium and arsenic are collectively known as the "five poisons" among heavy metals, which are seriously harmful to the ecological environment and human health. Since lead ions can only be transformed, transferred, and diluted in nature and cannot be biodegraded, all countries have listed lead as a priority pollutant in water. Lead and its compounds can enter the human body through the food chain and accumulate in the liver and kidneys, leading to hemoglobin synthesis disorders and anemia, which will have long-term adverse effects on human health. In addition, excessive intake of lead by the human body will harm the nerves, heart and respiratory system, leading to different degrees of lead poisoning, and the chance of lead poisoning in children far exceeds that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/62
Inventor 程爱华赵晓光冯利凡
Owner XIAN UNIV OF SCI & TECH
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