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Environment-friendly carbon nanotube/sodium alginate heavy metal ion sorbing material and preparation method thereof

A technology of heavy metal ions and carbon nanotubes, which is applied in the field of nano-materials and environmental protection, can solve the problems of carbon nanotubes, secondary micro-pollution of water environment, etc., and achieve good adsorption capacity, easy control of conditions, and simple preparation process Effect

Inactive Publication Date: 2009-11-11
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned technical deficiencies, the present invention provides a method for preparing carbon nanotube / sodium alginate environment-friendly composite material for adsorbing and removing heavy metal ions in sewage, which not only fully exerts the high-efficiency adsorption performance of carbon nanotubes, but also avoids the Carbon nanotubes are difficult to remove from water bodies, causing secondary micro-pollution to the water environment

Method used

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  • Environment-friendly carbon nanotube/sodium alginate heavy metal ion sorbing material and preparation method thereof
  • Environment-friendly carbon nanotube/sodium alginate heavy metal ion sorbing material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] After cleaning and drying 2.0 g of carbon nanotubes treated with a mixed solution of concentrated nitric acid and sulfuric acid, put them into 50 ml of deionized water, use an ultrasonic cell pulverizer to fully disperse the carbon nanotubes, and then place them in a magnetic heating stirrer Stir on. Put 0.1-1.0g of sodium alginate into 50ml of deionized water respectively. After fully dissolving, slowly drop the sodium alginate solution into the stirring carbon nanotube solution to make it evenly mixed. Evenly inject the carbon nanotube / sodium alginate mixed solution into 2L aqueous solution containing 1wt% calcium chloride with a syringe to prepare uniform carbon nanotube / sodium alginate particles, and wait until the carbon nanotube / sodium alginate particles are fully solidified Afterwards, the carbon nanotube / sodium alginate granular composite material is obtained by filtration. Add 0.05g of this material to 100ml of solutions with lead ion concentrations of 5, 20, ...

Embodiment 2

[0021] Weigh 2.0g of carbon nanotubes treated with a mixed solution of concentrated nitric acid and sulfuric acid, put them into 50ml of a solution containing 0.5g of potassium permanganate, heat to 100°C on a magnetic heating stirrer and stir for 2 hours, then vacuum repeatedly After filtering and washing, put the carbon nanotubes into an oven at 50°C for drying. The preparation method of the carbon nanotube / sodium alginate granular composite material and the lead ion adsorption experiment are the same as in Example 1. Adsorption experiments found that the carbon nanotube / sodium alginate composite material with potassium permanganate oxidation treatment of carbon nanotubes had better lead ion adsorption performance than the composite material prepared with mixed acid oxidation treatment of carbon nanotubes.

Embodiment 3

[0023] Put 0.05g carbon nanotube / sodium alginate composite into 100ml with different Pb 2+ concentration of the solution, adjust the pH of the solution from 3.0 to 7.0 under acidic conditions, at pH=3.0, due to H + and Pb 2+ The competition at the adsorption site makes the carbon nanotube / sodium alginate composite 2+ The adsorption effect is very weak; at pH = 5.0, the composite material for Pb 2+ The adsorption capacity is greatly increased; at pH = 7.0, the composite material for Pb 2+ The adsorption effect is more significantly increased, but at this time the lead ion will interact with OH - The reaction produces a white flocculent lead precipitate.

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Abstract

An environment-friendly carbon nanotube / sodium alginate heavy metal ion sorbing material and a preparation method thereof belong to the technical field of new nano material and environmental protection. Aiming at solving the problem that the carbon nanotube with microsize is likely to cause secondary pollution to water quality while being used as sorbent, the invention uses nontoxicity, good adsorptive capacity and excellent formability of sodium alginate, and prepares carbon nanotube / sodium alginate granular composite material by sol-gel method. The carbon nanotube / sodium alginate granular composite material has good adsorptive capacity on heavy metal ion in sewage. The method has simple preparation process and controllable condition, is suitable for mass production, reduces secondary pollution to water by the carbon nanotube with microsize, and prepares the environment-friendly carbon nanotube / sodium alginate composite sorbing material.

Description

(1) Technical field [0001] The invention relates to a novel carbon nanotube / sodium alginate composite material, which is used for adsorbing metal ions in waste water, and belongs to the technical field of new nanometer materials and environmental protection. (2) Background technology [0002] In recent years, the water environment pollution caused by heavy metals in the process of industrialization in my country has become increasingly serious, and the water quality has deteriorated day by day. Sorbent adsorption method is a method with small equipment investment, simple operation, and has been widely used to remove trace heavy metal ions in sewage. The key to this method is to find and develop new environmentally friendly adsorption materials with large adsorption capacity, high efficiency and non-toxicity. [0003] As a new type of high-efficiency adsorption material, the application research of carbon nanotubes in environmental protection has become a (a worldwide) hot t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/20B01J20/30C02F1/28C02F1/62
Inventor 李延辉杜秋菊张盼夏冰刘福强王德昌王宗花夏延致
Owner QINGDAO UNIV
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