Comparison of novel and patented silica-polyamine composite materials as aqueous heavy metal ion recovery materials

Journal Article · Fri Oct 01 04:00:00 EDT 1999 · Separation Science and Technology

DOI:https://doi.org/10.1081/SS-100100801· OSTI ID:20017394

Beatty, S T; Fischer, R J; Rosenberg, W; Pang, D

A novel silica-polyamine composite material, WP-1, was synthesized according to a new patented procedure for aqueous heavy metal ion removal. The effects of pH and initial concentration of metal ions on adsorption were investigated. Results showed that WP-1 has metal ion capacities in the order Cu(II) > Ni(II) > Fe(II) and generally works best in the 2--4 pH range. Kinetic studies showed the Cu(II) adsorption reaction occurs in a second-order fashion with a rate constant of 4.4 x 10{sup {minus}4} s{sup {minus}1}. Two similar silica-polyamine materials, prepared by different procedures cited in the literature, were compared with WP-1 for Cu(II) ion capacity and mechanical durability. These tests showed that capacities were more than twice as high when the new patented procedure was used, indicating much better coverage of the silica gel. During repeated metal loading and unloading tests, WP-1 maintained up to 94% of its initial Cu(II) capacity and its mechanical integrity for 3,000 cycles, whereas testing of the other materials had to be stopped prematurely due to degradation of the materials.

• Research Organization: Univ. of Montana, Missoula, MT (US)
• OSTI ID: 20017394
• Journal Information: Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 14 Vol. 34; ISSN 0149-6395; ISSN SSTEDS
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ADSORPTION
AMINES
CHEMICAL PREPARATION
COPPER
IRON
MATERIALS RECOVERY
MATERIALS TESTING
NICKEL
ORGANIC POLYMERS
SILICA
SORPTIVE PROPERTIES