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Heavy metal trapping material prepared by using waste polyurethane sponge, and preparation method

A polyurethane sponge and capture material technology, applied in the field of heavy metal capture materials and its preparation, can solve the problems of difficult removal of heavy metal ions, a large number of flocs and sludge, and the inability to regenerate and reuse, so as to achieve waste utilization and low density , the effect of high toughness

Active Publication Date: 2015-03-18
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that complex heavy metal ions in electroplating wastewater are not easy to remove, the existing heavy metal traps have incomplete separation during use, a large amount of flocs and sludge will be produced, and most of the heavy metal traps Insufficiency of being unable to regenerate and reuse, the present invention provides a heavy metal trapping material prepared by using waste polyurethane sponge and a preparation method. CAS No.51852-81-4) as the substrate, the new spongy recyclable heavy metal capture material containing dithioamino groups (English: Dithiocarbamate, hereinafter referred to as DTCA) was prepared by chemical modification

Method used

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  • Heavy metal trapping material prepared by using waste polyurethane sponge, and preparation method
  • Heavy metal trapping material prepared by using waste polyurethane sponge, and preparation method
  • Heavy metal trapping material prepared by using waste polyurethane sponge, and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Extract 2.0 g of polyurethane sponge with ethanol in a Soxhlet extractor for 4 hours, put it in a large beaker after drying, add 400 ml of 2 mol / L sodium hydroxide solution, stir for 4 hours, and wash 3 times with distilled water (500ml each time). Transfer the sponge into a stainless steel reaction kettle, add 200 ml of ethanol and 20 ml of carbon disulfide. The reaction temperature is 5 degrees Celsius, the reaction pressure is 0.1 MPa, and the reaction is stirred at a speed of 60 r / min for 4 hours. The product obtained in the reaction is subjected to solid-liquid separation, washed with ethanol, and dried to obtain a spongy heavy metal capture material (PU-DTCA ). The PU-DTCA chemical structure that embodiment 1 makes is as figure 1 said n is the degree of polymerization, in the range of 500-1200 (the degree of polymerization of the polyurethane sponge used is usually 500-1200), such as figure 2 The FT-IR spectrum of PU-DTCA is shown, the abscissa is the wave n...

Embodiment 2

[0048] Extract 2.0 g of polyurethane sponge with acetone in a Soxhlet extractor for 4 hours, put it in a large beaker after drying, add 400 ml of 3mol / L sodium hydroxide solution, stir for 4 hours, and wash with distilled water for 3 times (500ml each time). Transfer the sponge into a stainless steel reaction kettle, add 200 ml of ethanol and 30 ml of carbon disulfide. The reaction temperature is 8 degrees Celsius, the reaction pressure is 0.1 MPa, and the reaction is stirred and reacted at a speed of 60 r / min for 4 hours. The reaction product is subjected to solid-liquid separation, washed with ethanol, and dried to obtain a spongy heavy metal trapping material PU-DTCA.

[0049] Static equilibrium adsorption test: at a temperature of 20 degrees Celsius, add 0.1g of sponge adsorption material to 5 Erlenmeyer flasks, and add 100ml of heavy metal ions with an initial concentration of 40, 80, 120, 160, 200mg / L in each Erlenmeyer flask Solution, after shaking in a constant temper...

Embodiment 3

[0055] Add 2.0 g of polyurethane sponge to 200 ml of ethanol and extract in a Soxhlet extractor for 4 hours, place it in a 3-neck bottle after drying, then add 400 ml of 4mol / L sodium hydroxide solution, stir for 4 hours, and use Wash with distilled water 3 times (500 ml each time). Transfer the sponge into a stainless steel reaction kettle, add 200 ml of ethanol and 40 ml of carbon disulfide. The reaction temperature is 10 degrees Celsius, the reaction pressure is 0.1 MPa, and the reaction is stirred at a speed of 60 r / min for 4 hours. The reaction product is subjected to solid-liquid separation, washed with ethanol, and dried to obtain a spongy heavy metal trapping material PU-DTCA.

[0056] Static equilibrium adsorption test: at a temperature of 20 degrees Celsius, add 0.1g of sponge adsorption material to 5 Erlenmeyer flasks, and add 100ml of heavy metal ions with an initial concentration of 40, 80, 120, 160, 200mg / L in each Erlenmeyer flask Solution, after shaking in a c...

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Abstract

The invention discloses a heavy metal trapping material prepared by using waste polyurethane sponge and a preparation method, and belongs to the field of environmental material synthesis and application. The method comprises the steps that the polyurethane sponge serves as a matrix; the matrix is subjected to dithiocarbamate surface chemical modification; and the novel spongy heavy metal trapping material is prepared. The preparation method has the characteristics that surface modification dithiocarbamate reacts after polyurethane sponge pretreatment; the preparation method is simple; the cost of a raw material is low; the prepared spongy heavy metal trapping material can remove EDTA (Ethylene Diamine Tetraacetic Acid)-complexing heavy metal ions in water through action of surface dithiocarbamate; the used sponge is easy to recover and separate, and can be used repeatedly after being reproduced with acid; and the spongy heavy metal trapping material is suitable for removal of complexing heavy metal ions in water / waste water.

Description

Technical field: [0001] The invention discloses a heavy metal trapping material and a preparation method thereof, in particular to a spongy heavy metal trapping material with xanthic acid groups prepared by using waste polyurethane sponge and a preparation method thereof. Background technique: [0002] In recent years, my country's heavy metal water pollution has become increasingly serious, especially the removal of complex heavy metal ions in electroplating wastewater has always been a difficult problem in the field of water treatment. In recent years, a heavy metal trapping agent has been developed to remove heavy metal ions in water. The heavy metal trapping agent is a kind of easy-to-operate, liquid chemical agent containing dithiocarbamate and xanthate, which can remove Complex heavy metal ions in wastewater. However, the heavy metal scavenger has the following deficiencies during use: [0003] Most of the existing heavy metal collectors are liquid agents, and the op...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30B09B3/00C02F1/28C02F101/20C02F103/16
Inventor 王津南程澄杨欣陈晨
Owner NANJING UNIV
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