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Biochar adsorbent for petroleum organic pollutants, and preparation method and application thereof

A technology of organic pollutants and adsorbents, applied in the field of biological carbonaceous adsorbents and their preparation, can solve the problems of groundwater pollution, difficult to decompose, high water solubility, etc., and achieve the effect of cheap price, obvious adsorption effect and large output

Inactive Publication Date: 2014-10-08
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has high water solubility, is neither easy to decompose nor adsorbed by soil particles, and has a certain risk of groundwater pollution.

Method used

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  • Biochar adsorbent for petroleum organic pollutants, and preparation method and application thereof
  • Biochar adsorbent for petroleum organic pollutants, and preparation method and application thereof
  • Biochar adsorbent for petroleum organic pollutants, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Preparation of biological carbonaceous adsorbent by using corn stalks

[0024] (1) Corn stalks were taken from a farmer’s house in Langfang, Hebei Province, removed ears and leaves, air-dried for 2 days, and dried in an oven at 105°C for 14 hours; then crushed into powder with a particle size of less than 40 mesh.

[0025] (2) Place 7 groups of corn stalk powders in crucibles, seal them and heat and carbonize them in a muffle furnace for 6 hours. The temperature is between 200 and 800 °C, and the interval between each group is 100 °C. Wait for the instrument to cool down to room temperature. The crucible was taken out, and biochar at 7 different carbonization temperatures were prepared.

[0026] (3) Soak the carbonized product in 1mol / L HCl solution for 12 hours to remove ash, then wash it with deionized water until neutral, and dry it in an oven at 105°C for 14 hours to prepare the corn straw biochar Recorded as MB200, MB300, MB400, MB500, MB600, MB700 and M...

Embodiment 2

[0031] The adsorption research of embodiment 2 biological carbonaceous to benzene

[0032] 1. Benzene (liquid) is used as the adsorbate, purchased from Beijing Chemical Factory, with a purity > 99%, and the molecular formula is C 6 h 6 .

[0033] 2. Weigh 0.05g of 7 different biochar samples (MB200~MB800) into 40mL brown headspace bottles. Add 30 mL, 0.01 mol / L CaCl by mass method using a 5 mL pipette 2 solution to simulate the ion existence state of organic matter in natural water bodies. Quickly add benzene solutions with different initial concentrations (0.872-75.807mg / L) into a 40mL brown headspace vial with a micro-syringe, quickly cap the bottle and place it in a constant-temperature air shaker at 25°C at a speed of 175rpm / min in the dark. Oscillate down.

[0034] 3. Set up 2 parallel samples and 1 control sample in each group (the control sample is a biocarbon blank control group, mainly to observe the possible volatilization of organic pollutants, photolysis and l...

Embodiment 3

[0037] The adsorption research of embodiment 3 biological carbonaceous to MTBE

[0038] Adopting MTBE (liquid state) is analytically pure, and buys Bai Guoyao Group Chemical Reagent Co., Ltd., purity > 99%, and molecular formula is C 5 h 12 0. Adopt the same method as embodiment 2, just replace benzene with MTBE, finally according to the liquid phase equilibrium concentration (C eq ) and solid-phase adsorption capacity (C s ), draw the adsorption isotherm, and use the Freundlich type adsorption isotherm to fit the data, see attached figure 2 . The results showed that the corn stalk biochar had a strong adsorption capacity for MTBE in the solution, and the adsorption performance was the best at the carbonization temperature of 700°C and 800°C.

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Abstract

The invention provides a novel high-efficiency and economic biochar adsorbent for petroleum organic pollutants and a preparation method and application thereof. The preparation method comprises the following steps: (1) drying and crushing corn straw on which spikes and leaves are removed; (2) placing corn straw powder in a crucible, sealing the crucible, putting the crucible in a muffle furnace, carrying out heating and charring for 6 to 6.5 h at 700 to 800 DEG C and taking out the crucible after cooling to room temperature so as to obtain a charring product; and (3) soaking the charring product in an HCl solution with a concentration of 0.98 to 1.02 mol / L for 12 to 13 h to remove ash, washing the product with deionized water until the product is neutral and drying the product so as to obtain the biochar adsorbent. Raw materials used in the method are widely available and cheap; and the biochar adsorbent exerts an obvious adsorption effect on petroleum organic pollutants, which is of great significance to restoration of contaminated soil and alleviation of underground water pollution.

Description

technical field [0001] The invention relates to an adsorbent for petroleum organic pollutants, in particular to a biological carbonaceous adsorbent and its preparation method and application. Background technique [0002] In the process of oil extraction and transportation, due to the leakage of underground oil storage tanks, the rupture and leakage of sewage and oil pipelines, a large amount of crude oil components enter the soil in the vadose zone, which poses a great threat to the safety of the groundwater system. [0003] Benzene series (BTEX) and methyl tert-butyl ether (Methyl tert-Butyl Ether, MTBE) are petroleum organic pollutants. Benzene is volatile and highly toxic. It may irritate the skin and eyes of the human body, and cause damage to the nervous system, immune system and intestines and stomach. As a commonly used additive in gasoline in my country, methyl tert-butyl ether can promote the complete combustion of gasoline. It has high water solubility, is neith...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C10G25/00
Inventor 毕二平肖丽微李峰
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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