Preparation method of organic modified bentonite for adsorbing thiocyanate ions

A technology of bentonite and thiocyanate, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., to achieve high adsorption rate and low cost

Inactive Publication Date: 2014-09-10
JIANGSU WAN QI BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Montmorillonite is a 2:1 layered aluminosilicate clay mineral composed of two Si-O tetrahedra sandwiching an Al-O octahedron. It is this special structure of montmorillonite that makes bentonite have a strong However, the Si-O structure on the surface of natural bentonite makes it hydrophilic and oleophobic, and has no significant effect on the adsorption of toxic inorganic pollutants thiocyanate ions in coking wastewater

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0020] In this embodiment, a preparation method of organically modified bentonite for adsorbing thiocyanate ions, the weight components of each component of the formula and the production operation steps are as follows:

[0021] Name Weight component

[0022] Sodium bentonite 50%-75%

[0023] Cetyltrimethylammonium bromide 20%-38%

[0024] Tetramethylammonium chloride 1%-16%.

[0025] 1. Weigh the cetyltrimethylammonium bromide and tetramethylammonium chloride in the formula and dissolve it in 200ml of distilled water, and stir at 16°C for 30min to prepare a mixed solution A;

[0026] 2. Weigh the sodium-based bentonite of the formula and add it to the mixed solution A, and continue to stir at a speed of 160r / min for 1 hour to make a mixed solution B;

[0027] 3. Filter the mixed solution B, and then repeatedly wash the resulting filter residue with distilled water until there are no bromide and chloride ions. After vacuum filtration, the resulting filter cake is dried at 75°C for 24 hour...

Embodiment 1

[0029] A method for preparing organically modified bentonite for adsorbing thiocyanate ions, the weight components of each component of the formula and the production operation steps are as follows:

[0030] Name Weight component

[0031] Sodium bentonite 69%

[0032] Cetyltrimethylammonium bromide 27.6%

[0033] Tetramethylammonium chloride 3.4%.

[0034] 1. Weigh the cetyltrimethylammonium bromide and tetramethylammonium chloride in the formula and dissolve it in 200ml of distilled water, and stir at 16°C for 30min to prepare a mixed solution A;

[0035] 2. Weigh the sodium-based bentonite of the formula and add it to the mixed solution A, and continue to stir at a speed of 160r / min for 1 hour to make a mixed solution B;

[0036] 3. Filter the mixed solution B, and then repeatedly wash the resulting filter residue with distilled water until there are no bromide and chloride ions. After vacuum filtration, the resulting filter cake is dried at 75°C for 24 hours, and the resulting solid is...

Embodiment 2

[0038] Weigh 0.5g, 1.5g, and 2.5g of organically modified bentonite, respectively, and add them to 100ml of thiocyanate ion solution with a mass concentration of 0.05g / L, and absorb at 160r / min at 25℃ and PH=7. 1h, the results showed that the thiocyanate ion mass concentration is 0.05g / L solution 100ml, when the mass of organic modified bentonite is 0.5g, the adsorption rate of thiocyanate ion can reach more than 90%. The added mass of organic modified bentonite increases, and the adsorption rate of thiocyanate ions further increases. When the added mass reaches 1.5g, the adsorption rate reaches 97.05%, and the increase in the mass of organic modified bentonite has little effect on the adsorption effect. Therefore, in 100 ml of thiocyanate ion solution with a mass concentration of 0.05 g / L, it is preferable to add organically modified bentonite with a mass of 1.5 g.

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Abstract

The invention discloses a preparation method of organic modified bentonite for adsorbing thiocyanate ions. According to the technical scheme, the organic modified bentonite comprises 50-70 percent of sodium bentonite, 20-38 percent of hexadecyl trimethyl ammonium bromide and 1-16 percent of tetramethyl ammonium chloride. The preparation method comprises the following steps: weighing hexadecyl trimethyl ammonium bromide and tetramethylammonium chloride according to a formula ratio and dissolving in 200 ml of distilled water, and stirring at a temperature of 16 DEG C for 30min to prepare a solution A; weighing sodium bentonite according to the formula ratio and adding sodium bentonite in the solution A, and continuing stirring at a rotating speed of 160 r/min for 1 h to prepare a solution B; and filtering the solution B, then repeatedly washing the obtained filter slag by using the distilled water until no bromide ion or chorine ion exists, performing vacuum filtration to obtain a filter cake, drying the filter cake at a temperature of 75 DEG C for 24 h, and grinding the obtained solid into powder with a particle size of not more than 100 microns. The preparation method has the following beneficial effects that the bentonite which is abundant in the nature is used as a raw material and is low in cost, and the bentonite which is organically modified can be widely applied to the adsorption and the treatment of toxic inorganic matters in industrial wastewater such as electroplating, coking, metal smelting, pesticide and dyeing.

Description

Technical field [0001] The invention relates to the technical field of sewage and wastewater treatment, in particular to a preparation method of organically modified bentonite for adsorbing thiocyanate ions. Background technique [0002] As the core component of coking wastewater pollutants, thiocyanide has a mass concentration of 200-1000mg / L in wastewater, which is the highest content of inorganic pollutants. [0003] Bentonite is a non-metallic clay mineral, and its main mineral component is montmorillonite. Montmorillonite is a 2:1 layered aluminosilicate clay mineral composed of two Si-O tetrahedrons and an Al-O octahedron. It is the special structure of montmorillonite, which is a strong bentonite. However, the Si-O structure on the surface of natural bentonite makes it hydrophilic and oleophobic, and has no significant effect on the adsorption of toxic inorganic pollutants thiocyanate ions in coking wastewater. Summary of the invention [0004] In order to solve the above p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F1/58
Inventor 金瑞
Owner JIANGSU WAN QI BIOLOGICAL TECH
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