Abstract
In this work, a composite sorbent based on hydrous zirconium oxide was used for selective removal of Ge(IV) oxoanions. Experiments were carried out by batch equilibrium tests and dynamic column sorption. The best sorption capacity was reached at the pH of 9, when about 4.3 g of Ge by liter of composite. The negative effect of the concentration of chlorides and sulfates was observed when their concentration was higher than 500 mg/L. The optimal specific solution flow rate for sorption by ZrO2-PAN sorbent was determined to be 6 BV/h. For regeneration, 15 BV of 0.5 M HCl solution saturated with NaCl was used.
Highlights
Germanium has many applications in semiconductors, as a dopant in the fiber optics for communication networks, infrared vision systems, and silicon solar panels and as a polymerization catalysts in PET plastics production[1,2,3,4]
The negative effect of chlorides and sulfates was observed when the concentration was higher than 500 mg/L
The selectivity of ZrO2-PAN was very high, between 100 and 500 mg/L of accompanying anions
Summary
Germanium has many applications in semiconductors, as a dopant in the fiber optics for communication networks, infrared vision systems, and silicon solar panels and as a polymerization catalysts in PET plastics production[1,2,3,4]. Recovery of germanium from aqueous solution with adsorption processes can be achieved by polymeric sorbents containing Nmethylglucamine functional group[21,22,23,24,25,26], or sorbents based on chitosan or cellulose. Experimental conditions Dynamic column sorption (Figure 1): The loading solution passed through the column (inner diameter 10 mm) containing 10 mL of sorbent with the flow rate of 3 to 24 BV/h.
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