Figure 3. A heavy metal recovery module packed with the SRF. (IMAGE)
Caption
Fig. 3. A heavy metal recovery module packed with the SRF. (a) Representative illustration of the module packed with the SRF for continuous recovery of heavy metals. The recovery module includes an upper part, in which the SRF is filled and is connected to the inlet and outlet pipes of the heavy metal solution, and a lower space, in which crystals of the heavy metal resources self-detached from the SRF surface can be concentrated by a density difference. (b) Actual photographs of the module packed with the SRF. (c) The heavy metal ions are crystallized on the surface of the SRF fiber. Scale bar: 500 μm. (d) Actual photographs of the module packed with the SRF during the injection of copper nitrate solution for 5h. (e) The heavy-metal crystal layers are self-detached and gathered at the bottom of the module. Scale bar: 200 μm. (f) A constant weight of crystal layers for heavy metals could be recovered during continuous injection of 100 L of copper nitrate solution with 100 ppm concentration into the module, packed with 5 g of SRF at a flow rate of 0.2 L/min. (g) Deconvoluted XPS peaks of N 1s on the SRF with different immersing times in the copper nitrate solution: 0, 1, 5, 10, 20, and 50 h.
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Korea Institute of Science and Technology(KIST)
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