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Preparation method of material used for treating wastewater containing aromatic nitro-compounds

A technology for aromatic nitro groups and compounds, which is applied in the field of preparation of water treatment materials and can solve problems such as secondary pollution

Inactive Publication Date: 2011-11-23
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, an important defect of the adsorption method is that the pollutants are transferred, the pollution still exists, and improper treatment can easily cause secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Grind 10g of bentonite with a cation exchange capacity of 108.4mmol / 100g into 20 meshes and disperse it into 25ml of acetone to make a suspension; add anhydrous KCl and anhydrous FeCl to the suspension 3 , anhydrous KCl and anhydrous FeCl 3 The total amount is 10% of the total cation exchange capacity of bentonite, anhydrous KCl and anhydrous FeCl 3 The amount of each is 0.36mmol and 0.72mmol, where FeCl 3 The ratio of the amount (mole) of the substance to KCl is 1:2. Stir for 6 hours, and maintain the temperature at 30° C. during the stirring process; precipitate and separate, evaporate to dryness naturally, and obtain the water treatment material.

[0019] Add 0.05 g of the water treatment agent prepared by the above method to a 30 m concentration of 20 mg / L nitrobenzene solution, shake at a constant temperature of 25 ° C for 1 hour, precipitate and separate, measure the concentration of nitrobenzene in the solution, and the removal rate is 95.2%. The precipitate s...

Embodiment 2

[0021] Crush 15g of bentonite with a cation exchange capacity of 108.4mmol / 100g into 200 meshes, and disperse it into 30ml of acetone to make a suspension; add anhydrous KCl and anhydrous FeCl to the suspension 3 , anhydrous KCl and anhydrous FeCl 3 The total amount is 100% of the total cation exchange capacity of bentonite, anhydrous KCl and anhydrous FeCl 3 The amount of each is 5.42mmol and 10.84mmol, where FeCl 3 The ratio of the amount (mole) of the substance to KCl is 1:2. Stir for 4 hours, and maintain the temperature at 10° C. during the stirring process; precipitate and separate, evaporate to dryness naturally, and obtain the water treatment material.

[0022] Add 0.05 g of the water treatment agent prepared by the above method to a 30 m concentration of 20 mg / L nitrobenzene solution, shake at a constant temperature of 25 ° C for 1 hour, precipitate and separate, measure the concentration of nitrobenzene in the solution, and the removal rate is 99.7%. The precipita...

Embodiment 3

[0024] Grind 10g of bentonite with a cation exchange capacity of 76.3mmol / 100g into 200 mesh, disperse it into 25ml of acetone to make a suspension; add anhydrous KCl and anhydrous FeCl to the suspension 3 , anhydrous KCl and anhydrous FeCl 3 The total amount is 100% of the total cation exchange capacity of bentonite, anhydrous KCl and anhydrous FeCl 3 The amount of each is 1.5mmol and 6.1mmol, where FeCl 3 The ratio of the amount (mole) of the substance to KCl is 1:4. Stir for 6 hours, and maintain the temperature at 25° C. during the stirring process; precipitate and separate, evaporate to dryness naturally, and obtain the water treatment material.

[0025] Add 0.05 g of the water treatment agent prepared by the above method to a 30 m concentration of 20 mg / L nitrobenzene solution, shake at a constant temperature of 25 ° C for 1 h, precipitate and separate, measure the concentration of nitrobenzene in the solution, and the removal rate is 99.6%. The precipitate suspension...

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Abstract

The invention discloses a preparation method of a material used for treating wastewater containing aromatic nitro-compounds. In the method, firstly, 10-15g of bentonite is crushed into 20-200 meshes and then can be dispersed in 25-30ml of acetone to prepare turbid liquid; then, anhydrous KCl and anhydrous FeCl3 are added into the turbid liquid, the total amount of the anhydrous KCl and the anhydrous FeCl3 is counted by the total amount of K+ and Fe3+ charges and is 10-100% of the total cationic exchange content of the bentonite, the proportion of the FeCl3 and the KCl is 1:2-1:4, the mixed solution is stirred for 4-6h, and the temperature during stirring is 10-30 DEG C; finally, the mixed solution is precipitated and separated, so that the precipitate turbid liquid is dried to obtain the water treatment material. The water treatment material prepared by the method can adsorb the aromatic nitro-compounds efficiently and can directly decompose the adsorbed organic pollutants into carbondioxide, water and other harmless maters by adopting the Fe3+ catalytic action, and the water treatment agent after decomposition can be recycled.

Description

technical field [0001] The invention relates to a preparation method of a water treatment material, in particular to a preparation method of a water treatment material used for treating wastewater containing aromatic nitro compounds. Background technique [0002] Aromatic nitro compounds include nitrobenzene, nitrochlorobenzene, nitroaniline, etc., which are widely used in the production of medicines, pesticides, dyes, explosives and other chemical products. The production of these compounds is increasing day by day, and the amount of waste water produced is correspondingly increasing. This type of compound is highly toxic and difficult to degrade. It can enter the human body through respiratory inhalation or skin absorption, causing neurological symptoms, anemia and liver disease; if it enters water, it will cause water pollution. [0003] At present, the main treatment methods for aromatic nitro compound wastewater at home and abroad include physical, chemical, biochemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12C02F1/28B01J27/128C02F101/34C02F101/38
Inventor 马建锋李定龙黄文艳
Owner JIANGSU POLYTECHNIC UNIVERSITY
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