Method for separating lead ions in waste water by utilizing single-arm bonded alicyclic crown ether silicone resin

A silicone resin and alicyclic technology, which is applied in the field of heavy metal ion separation, can solve the problems of crown ether loss, inability to guarantee reusability, etc., and achieves the effects of fast separation speed, excellent thermal stability and cost reduction.

Active Publication Date: 2013-01-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crown ether molecules in this material are only adsorbed on the substrate by physical force, and the crown ether will inevitably be lost during the separation application process, so that its reusability cannot be guaranteed.

Method used

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  • Method for separating lead ions in waste water by utilizing single-arm bonded alicyclic crown ether silicone resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure 10 mL of heavy metal wastewater feed solution with a lead ion concentration of 50 ppm into a stoppered glass test tube, add 1.0 g of single-arm bonded alicyclic crown ether silicone resin; place the test tube in a constant temperature water bath at 25 °C, and use After 60 min of electromagnetic stirring, the single-arm bonded cycloaliphatic crown ether silicone resin and heavy metal wastewater were separated by a microporous membrane, and the residual concentration of lead ions in the liquid phase was determined by inductively coupled plasma emission spectrometer (ICP-AES) , the calculated removal rate of lead ions was 97.3%; the isolated one-arm bonded alicyclic crown ether silicone resin was eluted with 0.1mol / L nitric acid solution, washed three times with deionized water, and dried to obtain Recovery of regenerated one-arm bonded alicyclic crown ether silicone resin.

Embodiment 2

[0021] Put 50 mL of feed solution containing heavy metal ions such as copper, zinc, lead, and cadmium in a glass container with a stopper. The concentration of copper, zinc, and cadmium ions in the wastewater sample is 60 ppm, and the concentration of lead ions is 200 ppm; Take 10 g of single-arm bonded alicyclic crown ether silicone resin, add it to the above solution, and put the whole device in a constant temperature shaker at 30°C for 70 min, and then use a microporous filter membrane to separate the single-arm bond. Combined alicyclic crown ether silicone resin and wastewater phase, and measured the residual concentration of lead ions in the water phase, the calculated removal rate of lead ions was 94.8%; the recovered single-arm bonded alicyclic crown ether silicone resin was used 0.05 mol / L nitric acid solution to remove the adsorbed lead ions, and then repeatedly washed with deionized water and dried to realize the regeneration of single-arm bonded alicyclic crown ether...

Embodiment 3

[0023] Take 2 mL of waste water feed solution containing various heavy metal ions in a 5 mL stoppered glass test tube, the feed solution contains 30 ppm copper, 70 ppm zinc, 60 ppm cadmium, and 150 ppm lead; Cyclic crown ether silicone resin and put it into a magnet, put the test tube in a constant temperature water bath at 23°C, and after electromagnetic stirring for 80 minutes, use a microporous membrane to separate the one-arm bonded alicyclic crown ether silicone resin and the wastewater phase ; Measure the residual concentration of lead ions in the water phase by ICP-AES, and calculate the removal rate of lead to be 96.8%; put the isolated one-arm bonded alicyclic crown ether silicone resin into 0.15 mol / L nitric acid solution The adsorbed lead ions were eluted in the medium, followed by repeated washing with deionized water and drying, so as to realize the regeneration of the single-arm bonded alicyclic crown ether silicone resin.

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Abstract

The invention discloses a method for separating lead ions in waste water by utilizing single-arm bonded alicyclic crown ether silicone resin, and belongs to the technical field of heavy metal ion separation. Firstly, the single-arm bonded alicyclic crown ether silicone resin is added into the leady waste water, according to the ratio of 0.01 to 1.0 of the weight of the single-arm bonded alicyclic crown ether silicone resin to the volume of the leady waste water, and the mixture is stirred or oscillated for 20 to 300 min at the temperature of 5 to 50 DEG C; secondly, solid-liquid two-phase filtration and separation are carried out, the residual concentration of lead ions in the liquid phase is measured, and the separation removal ratio is calculated by comparing the residual concentration with the initial concentration; and finally, the single-arm bonded alicyclic crown ether silicone resin is eluted with a nitric acid solution of 0.01-3 mol/L, washed repeatedly with deionized water and dried to obtain regenerated resin. The method provided by the invention has the advantages of high separation speed, high removal ratio and strong suitability for lead ions in heavy metal waste water; and the material can be used repeatedly and is low in cost.

Description

technical field [0001] The invention belongs to the technical field of separation of heavy metal ions, and in particular relates to a method for separating lead ions in waste water by using a single-arm bonded alicyclic crown ether silicone resin. Background technique [0002] With the development of society, a large amount of untreated heavy metal wastewater is directly discharged into natural water bodies, causing great harm. Among them, pollution accidents caused by heavy metal lead are particularly prominent. In 2010 alone, nine blood lead incidents occurred in China. Both lead ions and soluble lead salts are toxic and can be harmful to human health and plant growth. It can poison people's nerves, kidneys and hematopoietic system, causing convulsions, neurasthenia and anemia, etc., especially affecting the development of children. At present, the industrial pollutant discharge standard (GB25466-2010) sets the maximum allowable discharge mass concentration of lead ions ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62C02F101/20
Inventor 叶钢白飞飞韦继超王建晨陈靖
Owner TSINGHUA UNIV
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