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Preparation of charcoal-based material and application thereof in removing typical organic chloride pesticide in water environment

A base material, biochar technology, applied in the direction of water pollutants, other chemical processes, water/sewage treatment, etc., can solve the problems of high economic cost, low efficiency, limited use, etc., to achieve large specific surface area, loose texture, Inexpensive effect

Inactive Publication Date: 2017-09-19
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chlorine atom on the carbon ring of endosulfan has a very high electronegativity, the covalent bond formed by the sulfur atom and the oxygen atom is relatively stable, and it is also easy to form a hydrogen bond with the hydrogen atom in water. These properties make them extremely stable. Moreover, the degradation products of endosulfan, endosulfan diol and endosulfan sulfate, are also toxic, and traditional chemical methods and biodegradation are difficult to apply to the removal technology of endosulfan
At present, the adsorption method is a relatively economical and efficient method. Silica, charcoal, clay, carbon nanotubes, etc. are often used as adsorbents for the adsorption of endosulfan. However, the above-mentioned adsorbents have defects such as high economic costs or low efficiency , resulting in limited use of

Method used

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  • Preparation of charcoal-based material and application thereof in removing typical organic chloride pesticide in water environment
  • Preparation of charcoal-based material and application thereof in removing typical organic chloride pesticide in water environment
  • Preparation of charcoal-based material and application thereof in removing typical organic chloride pesticide in water environment

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Experimental program
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Effect test

Embodiment 1

[0046] The preparation of biochar-based material in this embodiment is as follows:

[0047] 1. Pretreatment: After obtaining the wetland plant canna from the wild, wash the root soil with deionized water, cut the plant into pieces (less than 5cm), place it in a ventilated place for two days, and then dry it at a temperature of 354K to constant weight;

[0048] 2. Removal of long fibers: crush the pretreated wetland plants to 100-300 mesh through a plant crusher, mix them evenly and pass through a 200-mesh sieve to obtain biomass materials;

[0049] 3. Preparation of biochar-based materials by oxygen-limited heating method: put the biomass material obtained in step 2 into a corundum container, put it into a tube furnace, and pass in nitrogen, the flow rate is controlled at 300mL / min, and it is obtained by oxygen-limited heating method Biochar-based material CANB550 (canna biochar). The obtained biochar-based material was lowered to room temperature and placed in a brown jar, s...

Embodiment 2

[0053] The preparation of biochar-based material in this embodiment is as follows:

[0054] 1. Pretreatment: After obtaining the wetland plant calamus from the wild, wash the root soil with deionized water, cut the plant into pieces (less than 5cm), place it in a ventilated place for two days, and then dry it at a temperature of 354K to constant weight;

[0055] 2. Removal of long fibers: crush the pretreated wetland plants to 100-300 mesh through a plant crusher, mix them evenly and pass through a 200-mesh sieve to obtain biomass materials;

[0056] 3. Preparation of biochar-based materials by oxygen-limited heating method: put the biomass material obtained in step 2 into a corundum container, put it into a tube furnace, and pass in nitrogen, the flow rate is controlled at 300mL / min, and it is obtained by oxygen-limited heating method Biochar-based material CALB550 (calamus biochar). The obtained biochar-based material was lowered to room temperature and placed in a brown ja...

Embodiment 3

[0060] Take by weighing 50mg CANB550 and 50mg CALB550, add respectively in the Erlenmeyer flask with stopper that contains 100mL endosulfan mixed solution, the concentration of α-endosulfan and β-endosulfan in the endosulfan mixed solution is set as a series of concentration gradients, respectively 0.5, 1, 2, 5.36, 8, 10mg / L, the pH value is about 5.6 (the pH of deionized water), the Erlenmeyer flask is placed in a constant temperature shaker for 7h (room temperature, 150rpm), the results are as follows figure 2 with image 3 shown. The adsorption rates of CANB550 to 0.5mg / L α-endosulfan and β-endosulfan reached above 94.8% and 90.0% respectively, and the adsorption rates of CALB550 to α-endosulfan and β-endosulfan reached above 86.4% and 84.6% respectively. For CANB550 and CALB550, the adsorption rate of α-endosulfan is higher, compared with β-endosulfan, the logK of α-endosulfan ow (4.94) is higher, the hydrophobic effect is more significant, and the adsorption capacity o...

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Abstract

The invention discloses preparation of a charcoal-based material and application thereof in removing typical organic chloride pesticide in a water environment. A wetland plant with higher water content and higher ash content is used as the basis of the charcoal material, and is pyrolyzed by an oxygen-limiting heating method, so as to prepare an adsorbing material with high-efficiency adsorption characteristic on the organic chloride pesticide in the water environment. The preparation has the advantages that the removal rate of alpha-endosulfan and beta-endosulfan is 80% or above by the charcoal-based material; the process of the CANB550 adsorbing the alpha-endosulfan and the beta-endosulfan can meet a Langmuir adsorbing model, and the maximum adsorbing amounts are respectively 25.34mg / g and 9.92mg / g.

Description

technical field [0001] The invention relates to the preparation of a biochar-based material and its application in removing typical organochlorine pesticides in water environments, and belongs to the technical field of organic pollutant treatment. Background technique [0002] Endosulfan is a type of organochlorine pesticides (OCPs). my country began to use endosulfan in 1994. From 1994 to 2004, the total amount of endosulfan used in cotton, tobacco, tea trees, wheat and apples was about 25,700 tons, and the main areas of use were concentrated in Xinjiang, East China, Central China and Southwest China . In 2011, endosulfan was included in the third list of pollutants under the Stockholm Convention. At present, 35% endosulfan EC products are commonly used in the market. In December 2016, my country announced the "Thirteenth Five-Year" Ecological and Environmental Protection Plan, which requires the reduction and elimination of chemicals controlled by the Convention, which r...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/36
CPCB01J20/20C02F1/283C02F2101/306C02F2101/36
Inventor 何琦卢少勇曹凤梅陈方鑫
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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