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Method for removing thiocyanate ions from water

A technology of thiocyanate and ions, which is applied in the field of environmental engineering, can solve the problems of long adsorption time, poor treatment effect, and large dosage, and achieve the effects of short adsorption time, wide applicable concentration range, and small dosage

Inactive Publication Date: 2013-07-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported in the literature that a single cation-modified bentonite is used to remove thiocyanate ions, but the treatment effect is not good, the adsorption time is very long and the dosage is large

Method used

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  • Method for removing thiocyanate ions from water
  • Method for removing thiocyanate ions from water
  • Method for removing thiocyanate ions from water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] (1) Weigh cetyltrimethylammonium bromide with 0.2 times the cation exchange capacity and tetramethylammonium chloride cationic surfactant with 0.2 times the cation exchange capacity, respectively, and place them in 200ml deionized water. Refers to the cation exchange capacity of the sodium bentonite used is 110 meq / 100 g, at a temperature of 20°C, stir for 0.3 h, then weigh 5 g of sodium bentonite with a cation exchange capacity of 110 meq / 100 g, add it to the mixed solution and continue Stir at constant temperature for 0.5h, filter under reduced pressure, wash with distilled water for 3 times, dry the obtained filter cake at 45°C for 8h, pass through an 80-mesh sieve after grinding, and obtain dicationically modified organobentonite, which is stored for future use;

[0030] (2) Add the organic bentonite obtained in (1) into 50mg / L potassium thiocyanate solution at a ratio of 15g / L, adjust the pH of the system to 7, shake and absorb at 25°C for 60mim, centrifuge, and tak...

Embodiment approach 2

[0033] (1) Weigh cetyltrimethylammonium bromide with 1.0 times the cation exchange capacity and tetramethylammonium chloride cationic surfactant with 1.0 times the cation exchange capacity, respectively, and place them in 250ml deionized water. Refers to the cation exchange capacity of the sodium bentonite used is 110 meq / 100 g. Stir at 30°C for 1.5 hours, then weigh 5 g of sodium bentonite with a cation exchange capacity of 110 meq / 100 g, add it to the mixed solution and continue to keep the temperature Stir for 2 hours, filter under reduced pressure, wash 5 times with distilled water, dry the resulting filter cake at 95°C for 24 hours, pass through an 80-mesh sieve after grinding, and obtain dicationically modified organobentonite, which is stored for future use;

[0034] (2) Add the organic bentonite obtained in (1) into 50mg / L potassium thiocyanate solution at a ratio of 15g / L, adjust the pH of the system to 7, shake and absorb at 25°C for 60mim, centrifuge, and take the su...

Embodiment approach 3

[0037] (1) Weigh cetyltrimethylammonium bromide with 1.0 times the cation exchange capacity and tetramethylammonium chloride cationic surfactant with 0.4 times the cation exchange capacity, respectively, and place them in 200ml deionized water. Refers to the cation exchange capacity of the sodium bentonite used is 110 meq / 100 g. Stir for 0.5 h at 25°C, then weigh 5 g of sodium bentonite with a cation exchange capacity of 110 meq / 100 g, add it to the mixed solution and continue to keep the temperature Stir for 1 hour, filter under reduced pressure, wash 5 times with distilled water, dry the resulting filter cake at 75°C for 12 hours, pass through an 80-mesh sieve after grinding, and obtain dication-modified organobentonite, which is stored for future use;

[0038] (2) Add the organic bentonite obtained in (1) into 50mg / L potassium thiocyanate solution at a ratio of 15g / L, adjust the pH of the system to 7, shake and absorb at 25°C for 60mim, centrifuge, and take the supernatant, ...

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Abstract

Belonging to the technical field of environmental engineering, the invention relates to a method for removing thiocyanate ions from water. The method is characterized by making use of long and short carbon chain cationic surfactants to modify bentonite to prepare a modified bentonite composite material, thereby removing thiocyanate ions from a water solution. Specifically, the steps include: (1) using long and short carbon chain cationic surfactants to modify sodium bentonite; (2) utilizing modified organic bentonite to adsorb thiocyanate ions from the water solution; and (3) testing the removal rate of thiocyanate ions. The organic bentonite obtained by the method has good stability, and has the characteristics of rapidity, high efficiency, simplicity, wide pH application range, low cost and the like in terms of adsorbing thiocyanate ions in the water solution, thus being widely applicable in treatment of industrial wastewater containing thiocyanate ions.

Description

technical field [0001] The invention relates to a method for removing thiocyanate ions in an aqueous solution, which belongs to the technical field of environmental engineering, and specifically relates to a method for modifying bentonite with long and short carbon chain cationic surfactants to obtain a modified bentonite composite material, which can remove thiocyanate ions in an aqueous solution. Technical scheme of the method of thiocyanate ion. Background technique [0002] Thiocyanate ion is a linear, negatively charged polyatomic ion, a typical halogen-like ion, and has good complexing properties. Due to its series of special properties, it is widely used in various industrial and agricultural productions, such as agricultural chemistry, hydrometallurgy (cyanide leaching of gold and silver), coking and gas preparation and other important fields. Due to the large amount of thiocyanate ions produced in industry and discharged into the environment, more and more water re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/58B01J20/22B01J20/30
Inventor 谢鲜梅段炼张建明孟磊孙玥
Owner TAIYUAN UNIV OF TECH
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