NOVEL CROSS-LINKED (BISPHENOL-S, FORMALDEHYDE, 1,6-HEXADIAMINE) TERPOLYMER FOR THE ADSORPTION OF Pb2+ IONS FROM AQUEOUS SOLUTIONS

Patent metadata

Field	Value
Publication number	US-2016016821-A1
Application number	US-201414334102-A
Country	US
Kind code	A1
Filing date	Jul 17, 2014
Priority date	Jul 17, 2014
Publication date	Jan 21, 2016
Grant date	—

Abstract

A cross-linked terpolymer (BSDF) obtained by polycondensation of bisphenol-S, formaldehyde and 1,6-diaminohexane. The terpolymer is highly efficient in eliminating lead ions from aqueous solutions. The adsorption of lead ions on BSDF was studied under different conditions such as: pH, contact time and temperature. The adsorption kinetics fits Lagergren second order kinetic model that are in agreement with the low surface area as a chemisorption process. Applying BSDF on non-spiked and spiked real wastewater samples under optimum conditions revealed the high efficiency of BSDF in removing toxic metal ions.

First claim

1 . A cross-linked terpolymer having a formula (I):

wherein:
the cross-linked terpolymer comprises polycondensed units of a substituted or unsubstituted bisphenol-S group, a substituted or unsubstituted 1,6-diaminohexane group, and formaldehyde;
n is the number of repeating units and n is an integer from greater than 1 to 1,000.

2 . The cross-linked terpolymer of claim 1 wherein the cross-linked terpolymer comprises unsubstituted units of bisphenol-S, unsubstituted units of 1,6-diaminohexane, and formaldehyde units.

3 . The cross-linked terpolymer of claim 1 , in the form of a solid material having a surface area in the range of 0.720-0.750 m 2 g −1.

4 . The cross-linked terpolymer of claim 1 , in the form of a solid material having a pore size diameter in the range of 161.0-163.0 nm.

5 . The cross-linked terpolymer of claim 1 , in the form of a solid material having a total pore volume in the range of 0.028-0.032 cm 3 g −1.

6 . The cross-linked terpolymer of claim 1 , further comprising one or more metal ions coordinated to one or more nitrogen atoms of the terpolymer.

7 . A method of making the compound of claim 1 , the method comprising:
polycondensing bisphenol-S, formaldehyde and 1,6 diaminohexane; wherein the contacting occurs in dimethylformamide as a solvent. curing the terpolymer at a temperature in the range of 70-90° C. and at a time period in the range of 22-26 hours to form a cross-linked terpolymer.

8 . The method of claim 7 , further comprising:
curing the terpolymer at a temperature in the range of 70-90° C. and at a time period in the range of 22-26 hours to form a cross-linked terpolymer.

9 . A method for removing metal ions from an aqueous solution, the method comprising:
contacting an aqueous solution comprising metal ions with an adsorbent comprising the terpolymer of claim 1 .

10 . The method of claim 9 , wherein after contacting, one or more metal ions are coordinated to one or more nitrogen atoms of the adsorbent.

11 . The method of claim 9 , wherein the metal ions are lead ions.

12 . The method of claim 9 , wherein the contacting removes at least 90% of the lead ions from the aqueous solution.

13 . The method of claim 9 , wherein the activation energy for the adsorption of lead ions onto the adsorbent is in the range of 4.0-5.0 kJ/mol.

14 . The method of claim 9 , wherein the aqueous solution has a pH in the range of 5-6.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Al Hamouz Othman Charles Sadeq
• Saleh Awadh Tawfik Abdo

Classifications

• B01J41/13

  obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds · CPC title

• C08G14/06

  and monomers containing hydrogen attached to nitrogen · CPC title

• C08G14/00

  Condensation polymers of aldehydes or ketones with two or more other monomers covered by at least two of the groups C08G8/00 - C08G12/00 · CPC title

• C02F2101/20

  Heavy metals or heavy metal compounds · CPC title

• C02F1/285 Primary

  using synthetic organic sorbents · CPC title