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Ion-Exchange Methods for Ultra Purification of Inorganic, Organic and Biological Substances
Published in Dmitri Muraviev, Vladimir Gorshkov, Abraham Warshawsky, Ion Exchange, 1999
Dmitri Muraviev, Vladimir Gorshkov, Abraham Warshawsky
The concentration of cadmium in the regenerating solution (after desorption from PT) achieves 10-30g/l that simplifies the final removal of cadmium from the eluent by the precipitation with alkali. The cadmium hydroxide obtained can be utilized in the production of the cadmium- calcium-phosphate catalyst. The following conclusion can be derived from the results obtained: (1) although the sorption capacity of the PT ion exchanger for cadmium is less than that of the ASC sorbent, however the PT can be completely regenerated and reused in the multi-cyclic process, and (2) the PT sorbent is, probably, the first and the only inorganic ion exchanger (at the moment), which industrial production from the titaniumcontaining wastes is feasible. All this favors the PT sorbent for purification of WW from cadmium. The results of the pilot-scale tests on the purification of the WW of acetaldehyde production from cadmium show that application of the PT sorbent decreases the cadmium concentration in the WW to 0.002mg/l.
Ultrasound assisted photocatalytic oxidative desulfurization of model diesel fuel
Published in Petroleum Science and Technology, 2018
Meng Zhao, Pingfang Han, Xiaoping Lu
0.1 mol solution of Cd (NO3)2·4H2O is prepared using distilled water that is then heated at 60°C to accelerate the dissolution of the cadmium salt. An aqueous solution of NaOH (0.5 mol) is then added to the cadmium solution. After that, the mixture is reacted under ultrasonic oscillation (H061, Ultrasonic processor, 20 kHz, 150 W). The ultrasonic vibration is afterward stopped, and an increasing number of hydroxide particles are slowly to generate and precipitate at the bottom of the beaker. The precipitate is then filtered on a buchner funnel and then washed with distilled water several times repeatedly. The obtained cadmium hydroxide is dried in an oven for 8 hours at 120°C and finally, the hydroxide particle is converted to cadmium oxide in muffle furnace for 4 hours at 500°C.