Development of a high-efficiency adsorbent from E-waste and aluminosilicate-based materials for the removal of toxic heavy metal ions from wastewater

• US 10,639,623 B2
• Filed: 03/12/2014
• Issued: 05/05/2020
• Est. Priority Date: 03/18/2013
• Status: Active Grant

• Current Assignee: Hong Kong University of Science and Technology
• Original Assignee: Hong Kong University of Science and Technology
• Inventors: Hadi Myavagh, Pejman, McKay, Gordon
• Primary Examiner(s): Peo, Kara M
• Application Number:
  US14/771,810
• Publication Number:
  US 20160023202A1
• Time in Patent Office: 2,246 Days
• Field of Search: None
• CPC Class Codes: B01J 39/09 Inorganic material
• CPC Class Codes: B01J 39/14 Base exchange silicates, e.g. zeolites
• CPC Class Codes: B01J 47/016 Modification or after-treatment of ion-exchangers
• CPC Class Codes: C02F 1/42 by ion-exchange ion-exchange in general B01J
• CPC Class Codes: C02F 2001/425 using cation exchangers
• CPC Class Codes: C02F 2101/20 Heavy metals or heavy metal compounds
• CPC Class Codes: C02F 2103/001 Runoff or storm water
• CPC Class Codes: C02F 2103/18 from the purification of gaseous effluents

Abstract

An impregnated and activated ion exchange material prepared by a process is provided that includes: impregnating an ion exchange precursor material, wherein impregnation of the ion exchange precursor material includes reacting the ion exchange precursor material with an impregnator solution, thereby increasing the surface area and the hydrophilicity of the ion exchange precursor material; activating the impregnated ion exchange precursor material to increase the porosity of the impregnated ion exchange precursor material, wherein the ion exchange precursor material comprises at least one of nonmetallic printed (NMP) circuit board, amorphous aluminosilicate, or mixtures thereof. In other aspects, a method for fabricating an ion exchanger and a method for removing heavy metal ions from a solution are provided.

Claims

1. A method for fabricating an ion exchanger, the method comprising:

impregnating a hydrophobic nonmetallic printed (NMP) circuit board ion exchange precursor material, wherein impregnating the ion exchange precursor material comprises;

reacting the ion exchange precursor material with a caustic impregnator solution to break a portion of bonds in the hydrophobic ion exchange precursor material into hydroxyl moieties, thereby increasing the surface area and the amount of hydroxyl moieties as well as rendering the hydrophobicion exchange precursor material hydrophilic; and

activating the impregnated ion exchange precursor material to increase porosity and affect the surface and a plurality of inner layers of the impregnated ion exchange precursor material.

2. The method according to claim 1, wherein the method for fabricating the ion exchanger further comprises washing and drying the impregnated and activated ion exchange precursor material.

3. The method according to claim 1, wherein during the impregnating of the ion exchange precursor material, a first plurality of alkali metal ions present in the caustic impregnator solution is exchanged with hydrogen atoms at the surface of the ion exchange precursor material.

4. The method according to claim 1, wherein during the activating of the impregnated ion exchange precursor material, a residual carbon content of the impregnated ion exchange precursor material is reduced.

5. The method according to claim 1, wherein during the activating of the impregnated ion exchange precursor material, a plurality of bond cleavages are restored in the impregnated ion exchange precursor material.

6. The method according to claim 1, wherein during the activating of the impregnated ion exchange precursor material, a plurality of alkali metal ions are exchanged for hydrogen atoms in the impregnated ion exchange precursor material.

7. The method according to claim 1, wherein a molarity of the caustic impregnator solution is between 0.05 and 5 mol/L.

8. The method according to claim 1, wherein during the impregnating of the ion exchange precursor material the mass ratio of the caustic impregnator solution to ion exchange precursor material is between 0.05 and 10.

9. The method according to claim 1, wherein the duration of impregnating the ion exchange precursor material is between 0.5 and 48 hours.

10. The method according to claim 1, wherein during the impregnating of the ion exchange precursor material, the impregnated ion exchange precursor material is at a temperature between 20 and 90°

C.

11. The method according to claim 1, wherein the duration of activating the impregnated ion exchange precursor material is between 0.5 and 24 hours.

12. The method according to claim 1, wherein during the activating of the impregnated ion exchange precursor material, the impregnated ion exchange precursor material is heated to a temperature between 100 and 700°

C.

13. The method according to claim 1, wherein the caustic impregnator solution comprises alkali metal ions.

14. The method according to claim 1, wherein the impregnating and activating occur prior to the ion exchange precursor material being used in ion exchange.