Method for recycling heavy-metal-accumulated plants

A heavy metal and recycling technology, applied in the field of resource utilization of plants, can solve the problems of occupying landfill space, etc., and achieve the effect of reducing quality, easy operation, and high-efficiency catalytic effect

Inactive Publication Date: 2014-09-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, landfilling may occupy a large amount of landfill space; at the same time, none of the above methods have produced certain economic value and environmental protection value

Method used

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  • Method for recycling heavy-metal-accumulated plants
  • Method for recycling heavy-metal-accumulated plants
  • Method for recycling heavy-metal-accumulated plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for resource utilization of plants accumulating heavy metals, comprising the steps of: the selected plants are castor-oil plant tissue samples (containing Cu: 6.42 ± 1.17 mg kg) grown in polluted soil -1 , Zn: 86.19±2.28 mg kg -1 ) to break up and mix well, and record it as sample A. Put the dried plant tissue sample A into a corundum boat, put the corundum boat into a tube-type resistance furnace, blow nitrogen for 15 min, and control the flow rate at 0.5 L min -1 , and then adjust the flow to stabilize at 0.2-0.3 L min -1 , turn on the resistance furnace, set the required temperature to 500°C, and start timing after heating until the set temperature is stable, so that the plant tissue sample is heat-treated at the set temperature for 8 hours, and then continue to pass nitrogen gas until the temperature is cooled to room temperature, take out the sample, and grind.

[0017] After heat treatment of sample A, its mass residual rate is 38.01%. After the heat t...

Embodiment 2

[0021] This example is basically the same as Example 1, except that the selected plant sample is a castor plant tissue sample grown in clean soil, which is recorded as sample B after crushing and mixing.

[0022] The mass residual rate of sample B after heat treatment is 38.63%, which reduces the mass of hazardous waste by 62%, which facilitates subsequent transportation and landfill.

[0023] Such as image 3 It was shown that the catalytic efficiency (99.71%) of the carbon-based catalyst B burned with clean plant tissue reached the best when the catalytic time was 10 min, and the catalytic effect was stable in the next 20 min. The catalytic effect of carbon-based catalyst B decreased after 40 min of catalytic time, but the catalytic effect could still be maintained above 80%, showing a good catalytic reduction effect on NO. The catalytic effect of the carbon-based catalyst A in the presence of heavy metals is not significantly different from that of the control carbon-based...

Embodiment 3

[0025] This example is basically the same as Example 1, except that the required temperature is set to 700°C, and the time is started after heating until the set temperature is stable, so that the plant tissue sample (denoted as C) accumulating heavy metals is heat-treated at the set temperature 6 h. After heat treatment, the mass residual rate of sample C is 32.76%. The two heat treatment temperatures (700 ℃, 6 h; 500 ℃, 8 h) have little difference in mass residual rate. The specific implementation can be based on the actual situation and comprehensive consideration Thermal input and catalytic effect to choose.

[0026] Such as Figure 4 As shown, the catalytic efficiency (99.80-99.92%) of the carbon-based catalyst C fired from plant tissues accumulating heavy metals remained stable and efficient within the measured catalytic time, showing green and efficient resource utilization value.

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Abstract

The invention relates to a method for recycling heavy-metal-accumulated plants. The method is used for repairing plant tissues in heavy-metal-contaminated soil and treating NOx in the atmosphere by virtue of the plant tissues. The method comprises the steps of putting a heavy-metal-accumulated plant tissue sample into a corundum boat, putting the corundum boat into a tube type resistance furnace, ventilating nitrogen for 15 minutes, controlling the flow at 0.5Lmin<-1>, regulating and stabilizing the flow to be within 0.2-0.3Lmin<-1>, opening the resistance furnace, setting the required temperature to be 500-700 DEG C, starting timing after the resistance furnace is heated to the set temperature, carrying out heat treatment on the plant tissue sample for 6-8 hours, then continuously ventilating until the resistance furnace is cooled to the room temperature, taking out the sample, and grinding the sample. According to the method, the heavy-metal-accumulated plant tissues are prepared into a charcoal-base catalyst by virtue of a certain heat treatment technique, so that the quantities of hazardous wastes are substantially reduced, the subsequent transportation and backfill are facilitated, and the catalyst has an efficient catalytic effect on NO.

Description

Technical field [0001] The invention involves a method of resource utilization of a cumulative heavy metal plant, which is the field of hazardous waste treatment and disposal technology. Background technique [0002] With the development of industrialization, the combustion of fossil fuels such as coal, oil, and natural gas produces a large amount of nitrogen oxides (NO x ) Elimination of the atmosphere, causing the concentration of nitrogen oxide in multiple areas to exceed the standard.When the NO concentration in nitrogen oxides is high, it will cause tissue hypoxia and even damage the central nervous system.How to effectively treat nitrogen oxide pollution has become an important part of my country's air pollution treatment.Carbon materials (such as activated coke, activated carbon and activated carbon fiber) are often used as adsorbents and catalyst carriers in nitrogen oxides, and can also be used as catalysts alone.A certain modification of activated carbon is made, such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01J21/18
Inventor 何池全张惠朱细娥陈学萍周吉峙钱光人
Owner SHANGHAI UNIV
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