Destruction of Cyanide and Removal of Copper from Waste Printed Circuit Boards Leach Solution Using Electro-Generated Hypochlorite Followed by Magnetite Adsorption
Abstract
:1. Introduction
2. Materials and Methods
2.1. Materials
2.2. Methods
- ①
- add mixture of phenolphthalein and ethyl alcohol (0.5 W/V%).
- ②
- add acetic acid until the red color of the solution disappears.
- ③
- add phosphate-buffer and chloramine-T and waiting for 5 min.
- ④
- add pyridine and waiting for 30 min and then measure the wavelength.
3. Results and Discussion
- (i)
- Peak-shape and main peak to shake-up peak separation is quite different for CuO and Cu(OH)2.
- (ii)
- O 1 s spectra must show the presence or absence of hydroxyl group or lattice oxide peak.
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Elements | Au | Ag | Cu | Ni | Fe | Sn | Zn | Pb | Free Cyanide |
---|---|---|---|---|---|---|---|---|---|
mg/L | 60.90 | 0.08 | 421.00 | 1.80 | 0.10 | 0.06 | 0.41 | 0.07 | 105.00 |
Sample | Initial | 1 Cycle | 2 Cycle | 3 Cycle | 4 Cycle | 5 Cycle |
---|---|---|---|---|---|---|
Time [min] | 5 | 20 | 30 | 40 | 50 | 60 |
Chlorine conc. [g/L] | 1.600 | 3.368 | 4.224 | 5.215 | 5.250 | 5.252 |
Compound | Cu | O | ||||
---|---|---|---|---|---|---|
Peak1 | Peak2 | Peak3 | Peak4 | Peak5 | ||
Reagent-grade NaOCl | 958.6 | 950.7 | 940.6 | 937.5 | 930.3 | 526.4 |
Electro-generated NaOCl | 959.6 | 951.2 | 940.5 | - | 932.0 | 528.8 |
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Bae, M.; Lee, H.; Kim, S.; Yoo, K. Destruction of Cyanide and Removal of Copper from Waste Printed Circuit Boards Leach Solution Using Electro-Generated Hypochlorite Followed by Magnetite Adsorption. Metals 2019, 9, 963. https://doi.org/10.3390/met9090963
Bae M, Lee H, Kim S, Yoo K. Destruction of Cyanide and Removal of Copper from Waste Printed Circuit Boards Leach Solution Using Electro-Generated Hypochlorite Followed by Magnetite Adsorption. Metals. 2019; 9(9):963. https://doi.org/10.3390/met9090963
Chicago/Turabian StyleBae, Mooki, Hyunju Lee, Sookyung Kim, and Kyoungkeun Yoo. 2019. "Destruction of Cyanide and Removal of Copper from Waste Printed Circuit Boards Leach Solution Using Electro-Generated Hypochlorite Followed by Magnetite Adsorption" Metals 9, no. 9: 963. https://doi.org/10.3390/met9090963