Fixed enrichment method for city life compost heavy metals through modified nanocarbon

A nano-carbon and heavy metal technology, applied in the restoration of polluted soil, etc., can solve problems such as lack of research

Inactive Publication Date: 2014-06-18
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] So far, there is a lack of research on the use of nanocarbon as a repair material for compost remediation

Method used

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  • Fixed enrichment method for city life compost heavy metals through modified nanocarbon
  • Fixed enrichment method for city life compost heavy metals through modified nanocarbon
  • Fixed enrichment method for city life compost heavy metals through modified nanocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] The method for fixing and enriching heavy metals in urban life compost by modified nano-carbon is carried out in the following steps:

[0093] (1) Handling of materials:

[0094] Before the experiment, the garbage compost was pretreated to remove large debris such as plastic films, bricks, stones, and glass. After air-drying, it was passed through a 2 mm sieve for later use; the physical and chemical properties of the garbage compost were: pH 7.62, organic matter content 221.25 g·kg -1 , total nitrogen 13.48 g·kg -1 , available phosphorus 0.078 g·kg -1 , C / N is 8.37, saturated water content is 0.76 mL·g -1, bulk density 0.85 g·mL -1 ; The contents of heavy metals (Cr, Cu, Pb, Zn) were 67.00, 238.73, 172.11 and 496.38 mg·kg, respectively -1 ;

[0095] The plants are tall fescue ( Festuca arundinacea L . );

[0096] The nano-carbon particle size is 20nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, which were modified before ap...

Embodiment 2

[0100] The method for fixing and enriching heavy metals in urban life compost by modified nano-carbon is carried out in the following steps:

[0101] (1) Handling of materials:

[0102] Before the experiment, the garbage compost was pretreated to remove large debris such as plastic films, bricks, stones, and glass. After air-drying, it was passed through a 2 mm sieve for later use; the physical and chemical properties of the garbage compost were: pH 7.62, organic matter content 221.25 g·kg -1 , total nitrogen 13.48 g·kg -1 , available phosphorus 0.078 g·kg -1 , C / N is 8.37, saturated water content is 0.76 mL·g -1 , bulk density 0.85 g·mL -1 ; The contents of heavy metals (Cr, Cu, Pb, Zn) were 67.00, 238.73, 172.11 and 496.38 mg·kg, respectively -1 ;

[0103] The plants are tall fescue ( Festuca arundinacea L . );

[0104] The nanocarbon particle size is 70 nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, which were modified before a...

Embodiment 3

[0108] The method for fixing and enriching heavy metals in urban life compost by modified nano-carbon is carried out in the following steps:

[0109] (1) Handling of materials:

[0110] Before the experiment, the garbage compost was pretreated to remove large debris such as plastic films, bricks, stones, and glass. After air-drying, it was passed through a 2 mm sieve for later use; the physical and chemical properties of the garbage compost were: pH 7.62, organic matter content 221.25 g·kg -1 , total nitrogen 13.48 g·kg -1 , available phosphorus 0.078 g·kg -1 , C / N is 8.37, saturated water content is 0.76 mL·g -1 , bulk density 0.85 g·mL -1 ; The contents of heavy metals (Cr, Cu, Pb, Zn) were 67.00, 238.73, 172.11 and 496.38 mg·kg, respectively -1 ;

[0111] The plants are tall fescue ( Festuca arundinacea L . );

[0112] The particle size of nano-carbon is 60 nm, and the specific surface area is 1.2×10 5 m 2 kg -1 , with a pH value of 7, which were modified befo...

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Abstract

The invention discloses a fixed enrichment method for city life compost heavy metals through modified nanocarbon. The fixed enrichment method comprises the following steps: modifying the modified nanocarbon with the grain diameter of 20-70nm before being applied so as to obtain various types of modified nanocarbon; then sealing a layer of cotton cloth and a nylon net at the lower end of a PVC (polyvinyl chloride) tube, uniformly and proportionally mixing garbage compost with the modified nanocarbon, wherein each tube is filled with150g of a mixed material; setting the temperature during experiments to be 19-27 DEG C and the relative humidity to be 60% to 72%, and supplementing water for the compost every day, so that the content of water of the compost reaches about 70% of field moisture capacity; sampling 45d for cultivation later, and carrying out morphological analysis on the heavy metals, wherein the addition of the modified nanocarbon is 1-5%(w/w) of the weight of the garbage compost. Experimental results show that the modified nanocarbon is added so that the contents of the heavy metals in a residual form are increased, the conversion of the compost heavy metals from a plant easily-absorbed state to a difficultly-absorbed state is promoted, and the method provides a basis for the application of the modified nanocarbon on passivation and plant enrichment of the heavy metals in garbage compost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to urban afforestation, in particular to a method for fixing and enriching heavy metals in urban life compost by modified nano-carbon. Background technique [0002] Due to its huge specific surface area, high active sites and excellent photoelectric properties, nanomaterials have attracted more and more attention in the research of remediation of polluted environment and become a new research hotspot. The special physical and chemical properties of nanomaterials depend on their specific surface area, distribution, and purity. Therefore, nanomaterials are very different from ordinary materials in terms of physical properties such as magnetism, light, electricity, and heat. They have adsorption, catalysis, radiation, absorption, etc. new features. Due to its large number of micro-interfaces and micro-porosity, nanoparticles can strengthen various interface reactions, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 多立安赵树兰贺璐
Owner TIANJIN NORMAL UNIVERSITY
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