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Method for preparing heavy metal adsorbent from waste polyvinyl chloride plastics

A technology for waste polyvinyl chloride and polyvinyl chloride, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problems of poor recycling of waste polyvinyl chloride plastics, etc. , to achieve the effect of increasing the recycling effect and increasing the specific surface area

Active Publication Date: 2020-07-03
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved by the present invention: the existing waste polyvinyl chloride plastic resource treatment is not good

Method used

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  • Method for preparing heavy metal adsorbent from waste polyvinyl chloride plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of method utilizing waste polyvinyl chloride plastics to prepare heavy metal adsorbent:

[0029] (1) Take waste and old polyvinyl chloride plastics (waste plastic pipes, waste plastic bottles, etc.) and crush them to 60 mesh through a crusher. Weigh 12g of broken plastic and place it in a high-temperature reactor, and add 32% H 2 o 2 Mix 50mL with liquid Tween, the mass ratio is 1:0.1; Stir at 35°C at a speed of 80r / min for a pre-reaction for 20min. After the crushed plastic and the catalyst are fully mixed, close the reactor. Set the temperature of the oven at 220°C to continue the catalytic reaction for 5 hours. After the reaction time is up, take the high-temperature reactor out of the oven and cool it down to room temperature naturally;

[0030] (2) performing solid-liquid separation on the mixture in the reactor to obtain a hydrothermal carbonization product. Weigh 5 g of the hydrothermal carbonization product into the reactor, and add 40 mL of 98% concen...

Embodiment 2

[0033] A kind of method utilizing waste polyvinyl chloride plastics to prepare heavy metal adsorbent:

[0034] (1) Take waste and old polyvinyl chloride plastics (waste plastic pipes, waste plastic bottles, etc.) and crush them to 100 mesh through a crusher. Weigh 15g of broken plastic and place it in a high-temperature reaction kettle, and add 32% H 2 o 2 Mix 45mL with Tween in a liquid state, the mass ratio is 1:0.25; Stir at a temperature of 35°C at a speed of 110r / min for a pre-reaction for 15min. After the crushed plastic and the catalyst are fully mixed, close the reactor. Set the temperature of the oven at 210°C to continue the catalytic reaction for 6 hours. After the reaction time is up, take the high-temperature reactor out of the oven and cool it down to room temperature naturally;

[0035] (2) performing solid-liquid separation on the mixture in the reactor to obtain a hydrothermal carbonization product. Weigh 8 g of hydrothermal carbonization product into the r...

Embodiment 3

[0038] A kind of method utilizing waste polyvinyl chloride plastics to prepare heavy metal adsorbent:

[0039] (1) Take waste and old polyvinyl chloride plastics (waste plastic pipes, waste plastic bottles, etc.) and crush them to 80 meshes through a crusher. Weigh 10 g of broken plastic and place it in a high-temperature reaction kettle, and add 32% H 2 o 2Mix 45mL with Tween in a liquid state, the mass ratio is 1:0.15; Stir at a temperature of 40°C at a speed of 65r / min for a pre-reaction for 10min. After the crushed plastic and the catalyst are fully mixed, close the reactor. Set the temperature of the oven at 240°C to continue the catalytic reaction for 3 hours. After the reaction time is up, take the high-temperature reactor out of the oven and cool it down to room temperature naturally;

[0040] (2) performing solid-liquid separation on the mixture in the reactor to obtain a hydrothermal carbonization product. Weigh 5 g of the hydrothermal carbonization product into t...

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Abstract

The invention discloses a method for preparing a heavy metal adsorbent from waste polyvinyl chloride plastics. The method is characterized by comprising the following steps: carrying out crushing pretreatment on the waste polyvinyl chloride plastics; adding a proper amount of a catalyst into the crushed plastic, stirring and mixing at a pre-reaction temperature, sealing, and keeping the temperature of the catalytic reaction for a period of time; after the reaction is finished, cooling to room temperature, and carrying out solid-liquid separation to obtain a hydrothermal carbonization product;adding a proper amount of concentrated sulfuric acid, and heating and oscillating for a period of time; cooling to room temperature after the reaction is finished to obtain a sulfonated and carbonizedproduct; and finally, activating and washing the sulfonated and carbonized product to obtain the adsorbent with heavy metal adsorption performance. A proper amount of the adsorbent can be added intoa high-concentration heavy metal solution for adsorption treatment. A hydrothermal carbonization method and a concentrated sulfuric acid sulfonation reaction are organically combined, the waste polyvinyl chloride plastic is recycled to prepare the adsorbent, the high-concentration heavy metal adsorption effect is good, meanwhile, the production process is simple, the cost is low, the energy consumption is low, and resources can be recycled.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for preparing a heavy metal adsorbent by using waste polyvinyl chloride plastics. Background technique [0002] At present, due to the characteristics of high mechanical strength, good insulation performance, low manufacturing cost and easy processing, polyvinyl chloride plastic is widely used in the production of building materials, industrial products, daily necessities, pipes, bottles, etc. However, the life cycle of polyvinyl chloride plastic is short, and 40% of the products will be converted into waste plastics after 1-2 years (Guo Bo. Research on the treatment and utilization technology of waste plastics [J]. China Population·Resources and Environment, 2013,23 (S2): 408-411.). With the extensive use of polyvinyl chloride plastics, the generated plastic waste can exist in the environment for a long time due to its poor degradability; a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/22
CPCB01J20/20B01J2220/4806B01J2220/4893C02F1/283C02F2101/20C02F2101/22
Inventor 李响朱大安邓黎玲薛罡徐先宝张艾顾霞陈红
Owner DONGHUA UNIV
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