Abstract
In this study, the adsorption and/or desorption capacity of tungsten ions using nickel–aluminum complex hydroxides was assessed. Nickel–aluminum complex hydroxides at various molar ratios, such as NA11 were prepared, and the adsorption capacity of tungsten ions was evaluated. Precisely, the effect of temperature, contact time, pH, and coexistence on the adsorption of tungsten ions in the water layer was demonstrated. Among the nickel–aluminum complex hydroxides at various molar ratios, the adsorption capacity onto NA11 was the highest of all adsorbents. The sulfate ions in the interlayer of NA11 was exchanged to tungsten ions, that is, the adsorption mechanism was ion exchange under our experimental conditions. Additionally, to elucidate the adsorption mechanism in detail, the elemental distribution and X-ray photoelectron spectroscopy of the NA11 surface were analyzed. Finally, the results indicated that the tungsten ions adsorbed using NA11 could be desorbed (recovered) from NA11 using sodium hydroxide solution. These results serve as useful information regarding the adsorption and recovery of tungsten ions using nickel–aluminum complex hydroxides from aqueous media.
Highlights
To establish a sustainable society, the United Nations Sustainable Development Goals (SDGs) have gained increasing attention worldwide
The amount of hydroxyl groups increased in the order of Ni:Al were 3:1 (NA31) (0.82 mmol/g) < NA21 (1.05 mmol/g) < NA12 (1.62 mmol/g) < NA11 (1.92 mmol/g)
Many studies have reported the adsorption mechanism, such as electrostatic interaction, ligand exchange, we demonstrated the relationship between using the amount of tungsten ions adand ion exchange, between the adsorbent and the adsorbate metal complex hydroxsorbed and amount of ions, sulfate ions
Summary
To establish a sustainable society, the United Nations Sustainable Development Goals (SDGs) have gained increasing attention worldwide. Goals 7 (affordable and clean energy) and 11 (sustainable cities and communities) were adopted for a stable supply of useful materials, such as rare metals. Tungsten is one of the most stockpiled rare metals (nickel, manganese, chromium, molybdenum, cobalt, and vanadium) in Japan. These useful materials are mostly unrecovered in physicochemical water treatment. A report exists regarding the relationship between tungsten ingestion from drinking water and the high rate of leukemia clusters in the western United States of America. The development of environmentally friendly and useful water treatment for the removal/desorption of tungsten is necessary for establishing a sustainable society
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