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A method for preparing heavy metal adsorbent by using waste polyvinyl chloride plastic

A technology of waste polyvinyl chloride and polyvinyl chloride, which is applied in chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of poor recycling of waste polyvinyl chloride plastics, etc., and achieve increased recycling Effect of utilization, increase of specific surface area, effect of strong adaptability

Active Publication Date: 2021-08-17
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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  • A method for preparing heavy metal adsorbent by using waste polyvinyl chloride plastic

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Experimental program
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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 by using waste polyvinyl chloride plastics, which is characterized in that it comprises the following steps: crushing waste polyvinyl chloride plastics for pretreatment; adding an appropriate amount of catalyst to the crushed plastics, and Stir and mix at high temperature and then airtight, and keep the catalytic reaction warm for a period of time. Cool to room temperature after completion, separate solid and liquid to obtain hydrothermal carbonization product; add appropriate amount of concentrated sulfuric acid, heat and shake for a period of time. After cooling to room temperature, the sulfonated carbonized product is obtained; finally, the sulfonated carbonized product is activated and washed with water to obtain an adsorbent with heavy metal adsorption properties. An appropriate amount of adsorbent can be added to the high-concentration heavy metal solution for adsorption treatment. The invention combines the hydrothermal carbonization method and the concentrated sulfuric acid sulfonation reaction organically to prepare waste polyvinyl chloride plastic resources into an adsorbent, which has a good adsorption effect on high-concentration heavy metals, and at the same time has a simple production process, low cost, low energy consumption, and low resource consumption. recyclable.

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 Patents(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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