Environmental Engineering Reference
In-Depth Information
Fig. 6.15 Copper loading on and removal from APTES silanized on silica-coated g-Fe
2
O
3
particles, in comparison to silica-coated g-Fe
2
O
3
particles at loading pH 5.3
the cost in industrial applications. Many methods such as acid washing, EDTA
(ethylenediamine tetraacetate) extraction, and electrowinning can be used to strip-
off metal ions from loaded magnetic sorbents. An ideal method would detach
metal ions effectively while maintaining maximum reactivity of magnetic sorbents.
The results of the stripping tests using nitric acid (0.01 M) are shown in
Fig. 6.16. The amount of copper detached vs the amount of copper loaded
Fig. 6.16 The amount of copper detached vs the amount of copper loaded
