Thermal cracking carbon for removing polycyclic aromatic hydrocarbon in water as well as preparation method and application thereof

A polycyclic aromatic hydrocarbon, thermal cracking technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of farmland straw resource treatment not fundamentally solved, unreasonable utilization of straw, etc. Unreasonable utilization problem, water safety problem solving, effect of low desorption rate

Inactive Publication Date: 2013-12-25
NANJING AGRICULTURAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are serious irrational use of these three types of straw, including the phenomenon of open-air burning of straw is becoming more and more serious [Su Jifeng, Zhu Bin, Zhou Tao, et al. Straw burning caused two air pollution incidents in Nanjing and surrounding areas Comparison of causes[J]. Journal of Ecology and Rural Environment, 2012, 28(1):37-41.] According to statistics, the amount of straw incineration in my country has exceeded 2×108t·a -1 , and the loss of nitrogen, phosphorus, and potassium due to straw burning is equivalent to about 60% of the country's total fertilizer production [Hua Li, Zhang Cheng, Ma Hongrui, et al. Research on the Environmental Benefits of Land Utilization of Straw Biochar[J]. Ecology Journal of the Environment, 2010, 19(10):2489-2492]
It shows that the resource treatment of farmland straw in my country has not been fundamentally solved

Method used

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  • Thermal cracking carbon for removing polycyclic aromatic hydrocarbon in water as well as preparation method and application thereof
  • Thermal cracking carbon for removing polycyclic aromatic hydrocarbon in water as well as preparation method and application thereof
  • Thermal cracking carbon for removing polycyclic aromatic hydrocarbon in water as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Wheat straw, corn straw and peanut shells are collected respectively, dried in the sun, and carbonized under the condition of anaerobic and 350-500 ℃ to make pyrolysis carbon. like figure 1 . The prepared pyrolysis carbon was dried to constant weight, crushed, passed through an 80-mesh sieve, and placed in a sealed bag for use.

Embodiment 2

[0028] A certain amount of different thermal pyrolysis carbon powders were weighed and added to the brown reagent bottle containing pyrene solution, and the adsorption amount was calculated by controlling pH, adsorption time and initial concentration. The effect of pH on the adsorption of pyrene by thermal pyrolysis carbon powder; the kinetic equation and adsorption rate of thermal pyrolysis carbon; the isotherm adsorption equation and maximum adsorption capacity of thermal pyrolysis carbon are obtained.

[0029] (1) Adsorption experiment of thermal pyrolysis carbon on polycyclic aromatic hydrocarbon pyrene

[0030] When the temperature is 25°C, take 5 mg of the dried thermal pyrolysis carbon powder (prepared in Example 1, the same below), respectively, and add them to 7 reagent bottles containing 40 ml of pyrene aqueous solution with a mass concentration of 60 μg / L. , adjust the pH to 4, 5, 6, 7, 8, 9 and 10, respectively. Vibration adsorption was carried out for 24h, and th...

Embodiment 3

[0038] Weigh 15 mg of the three thermal pyrolysis carbon powders prepared in Example 1 and add them to a brown reagent bottle containing a 60 μg / L pyrene solution, respectively. The pH of the solution was controlled to be 4, and the solution was shaken and adsorbed for 24 hours at 25 °C. The solution was taken through a microporous membrane, and the filtrate was used to measure the concentration of pyrene in the aqueous phase by high performance liquid chromatography. The removal rate was calculated according to the initial concentration and the concentration after adsorption. The result is as Figure 7 , it was found that the average removal rate of pyrene was 98% for the pyrolytic carbon prepared from corn straw, 92% for the pyrolytic carbon prepared from wheat straw, and 92% for the pyrolytic carbon prepared from peanut shells. The removal rate was 82%.

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Abstract

The invention belongs to the technical field of water environment safety and resource reuse, and relates to thermal cracking carbon for removing polycyclic aromatic hydrocarbon in water as well as a preparation method and an application thereof. The thermal cracking carbon is prepared by the following steps: airing one or more agricultural wastes selected from maize straws, wheat straws or peanut shells; and then carbonizing under an anaerobic condition at 350-500 DEG C. The thermal cracking carbon can be applied to removing polycyclic aromatic hydrocarbon in water. The invention provides a novel adsorbing material, and the thermal cracking carbon is prepared from the raw materials of maize straws, wheat straws or peanut shells which are taken as the thermal cracking carbon, so that not only is the problem that the straws are unreasonably utilized solved, are the agricultural wastes effectively utilized and is the environment purified, but also polycyclic aromatic hydrocarbon is effectively adsorbed, particularly pyrene, and the concentration of polycyclic aromatic hydrocarbon in an organic polluted water body is reduced. The thermal cracking carbon is low in desorption rate, persistent and stable, and the water safety problem is solved, thereby realizing two purposes.

Description

technical field [0001] The invention belongs to the technical field of water environment safety and resource reuse, and relates to a thermal cracking carbon for removing polycyclic aromatic hydrocarbons in water and a preparation method and application thereof. Background technique [0002] With the rapid development of modern industrial and agricultural production, associated organic pollutants (such as PAHs, PCBs, aromatic nitro compounds, etc.) such as pesticides, fertilizers and industrial wastes are continuously entering the environment. "Effects and high bioaccumulation, their diffusion will not only pollute the environment and destroy the ecological balance, but also endanger human health through the food chain, so the development of organic pollutant treatment technology has become one of the urgent tasks of environmental workers [Wang Ning, Hou Yanwei, Peng Jingjing, Dai Jiulan, Cai Chao. Research progress of biochar adsorption of organic pollutants. Environmental C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/32
Inventor 孙璇潘根兴李恋卿张旭辉郑聚峰郑金伟
Owner NANJING AGRICULTURAL UNIVERSITY
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