A comparative study of the removal of heavy metal ions from water using a silica-polyamine composite and a polystyrene chelator resin
The maximum Cu(II), Ni(II), and Co(II) ion capacities of a silica-poly(ethyleneimine) composite (WP-1) are compared with those of the commercially available iminodiacetic acid chelator resin Amberlite IRC-718. Under batch (static) conditions, IRC-718 exhibits better capacities for these metals than WP-1. Dynamic studies, however, revealed that WP-1 possessed a much higher capacity for all three divalent metals than IRC-718, with relative metal capacities in the order CU(II) {gt} CO(II) {approximately} Ni(II). In the presence of the competing chelator ethylenediaminetetraacetic acid, the Cu(II) capacities of WP-1 and IRC-718 lost 48% and 45%, respectively, of their original adsorption values. Even with this decrease, however, WP-1 maintained a higher CU(II) capacity than IRC-718. Repeated cycle testing, using CU(II) solutions at both room temperature and 97 C, was conducted to compare the long-term stability of each material. WP-1 maintained 94% of its original Cu(II) capacity and maintained structural integrity after 3,000 cycles using room temperature copper solutions, while IRC-718 compressed and dropped to 64% of its original capacity. When boiling copper solutions were used, the capacity of WP-1 increased slightly over 1500 cycles, while IRC-718 lost 13% of its original copper capacity and again became compressed, indicating degradation of the polystyrene beads.
- Research Organization:
- Univ. of Montana, Missoula, MT (US)
- OSTI ID:
- 20003888
- Journal Information:
- Industrial and Engineering Chemistry Research, Vol. 38, Issue 11; Other Information: PBD: Nov 1999; ISSN 0888-5885
- Country of Publication:
- United States
- Language:
- English
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