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Adsorbent for adsorbing six-valent chromium ion and its prepn process

A hexavalent chromium ion and adsorbent technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of long time required for adsorption equilibrium, expensive silane coupling agent, low adsorption capacity, etc., and achieve fast adsorption rate. , The effect of high surface modification ratio and high adsorption capacity

Inactive Publication Date: 2007-12-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In short, although there are many kinds of adsorbents that can be used for the adsorption and removal of hexavalent chromium ions, there are some unavoidable shortcomings such as low adsorption capacity, long time required to reach adsorption equilibrium or expensive silane coupling agent required for the preparation process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Use non-ionic surfactant polyoxyethylene-polyoxypropylene-polyoxyethylene (EO 20 PO 70 EO 20 ) Is used as template, TEOS is used as organic silicon source, water is used as solvent, and the pH value of the system is adjusted with hydrochloric acid to synthesize ordered silicon-based mesoporous material SBA-15.

[0043] Under mechanical stirring, add the organosilicon source to the template aqueous solution, stir at room temperature for 20 hours, and then crystallize at rest for 24 hours; filter, wash with deionized water to neutrality, vacuum dry at 100°C, and calcinate at 550°C5 After hours, SBA-15 carrier is obtained; the carrier has a maximum pore diameter of 6.5nm and a specific surface area of ​​873m 2 / g.

[0044] 3g of the carrier was first reacted with 3mL of γ-chloropropyltriethoxysilane in 50mL of toluene at reflux for 10 hours to obtain an intermediate product containing chloropropyl;

[0045] Then 3g intermediate product and 5g imidazole were refluxed in 60mL ac...

Embodiment 2

[0048]First, the ordered mesoporous silica SBA-15 was prepared as the carrier by the same method as in Example 1;

[0049] Then 3g of the carrier is first reacted with 3mL of γ-chloropropyltriethoxysilane in 50mL of toluene at room temperature for 10 hours to obtain an intermediate product containing chloropropyl;

[0050] Then 3g of the intermediate product and 3g of sodium triazole were refluxed in 60mL of ethanol for 48 hours. The reaction process was carried out with N 2 Protected to obtain the adsorbent for adsorbing hexavalent chromium ions of this embodiment.

[0051] Take 0.05 g of the adsorbent of this example, add 100 mL of wastewater containing 100 ppm of hexavalent chromium ions, adjust the pH of the solution to acidity with hydrochloric acid, equilibrate in a shaker for 24 hours, and use ICP-AES to detect the solution before and after adsorption The concentration of hexavalent chromium ions, the adsorption capacity of hexavalent chromium is 16mg / g.

Embodiment 3

[0053] Firstly, the ordered mesoporous silica SBA-15 was prepared as the carrier by the same method as in Example 1;

[0054] Then 3g of the carrier is first reacted with 3mL of γ-chloropropyltriethoxysilane in 50mL of toluene at room temperature for 10 hours to obtain an intermediate product containing chloropropyl;

[0055] Then 3g of the intermediate product and 5g of triazole were refluxed for 72 hours in 60mL of acetonitrile solvent, and N was used for the reaction process. 2 Protected to obtain the adsorbent for adsorbing hexavalent chromium ions of this embodiment.

[0056] Take 0.05 g of the adsorbent of this example, add 100 mL of wastewater containing 100 ppm of hexavalent chromium ions, adjust the pH of the solution to acidity with hydrochloric acid, equilibrate in a shaker for 24 hours, and use ICP-AES to detect the solution before and after adsorption The concentration of hexavalent chromium ions, the adsorption capacity of hexavalent chromium is 12mg / g.

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Abstract

The present invention is adsorbent for adsorbing six-valent chromium ion and its preparation process. The adsorbent includes silicon-base porous carrier and functional heterocyclic compound group supported through grafting reaction onto the surface of the silicon-base porous carrier. The silicon-base porous carrier is porous silica gel or ordered mesoporous silica; and the heterocyclic compound is nitrogen-containing piperidine, imidazole, triazole, triazo sodium or their salt. The preparation process includes the steps of: adding silicon-base porous material into toluene, adding organosilane coupler to react under the protection of N2, filtering and washing. The adsorbent is suitable for adsorption, separation and elimination of six-valent chromium ion in chromium containing solution.

Description

Technical field [0001] The invention belongs to an adsorbent and a preparation method thereof, and particularly relates to a material for adsorbing hexavalent chromium ions and a preparation method thereof. technical background [0002] Chromium and its compounds are widely used in electroplating, leather tanning, pigments, metallurgy, paint, printing and dyeing and printing industries, and occupy an important position in the national economy. However, the water pollution caused by the highly toxic chromium residue discharged by the traditional high-temperature roasting chromium salt production process and the chromium-containing wastewater discharged by the electroplating, tanning, printing and dyeing industries have caused serious pollution to the environment. In particular, hexavalent chromium is highly toxic, highly irritating and corrosive. If it enters the human body, it can cause cells to become cancerous, which is extremely harmful to the human body; it is also very harmf...

Claims

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Application Information

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IPC IPC(8): B01J20/22
Inventor 齐涛李俊宁王丽娜刘长厚
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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