Details

Autor(en) / Beteiligte

• Chen, Si-Lin
• Cao, Chun-Yan
• Long, Wen-Ling
• Wang, Min
• Zhao, Shuang
• Wan, Xin

Titel

Adsorption performance of cadmium (II) on calcined hydrotalcite

Ist Teil von

• Research on chemical intermediates, 2024-05, Vol.50 (5), p.2409-2426

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A series of calcined hydrotalcite were prepared via natural hydrotalcite (Mg 6 Al 2 (OH) 16 CO 3 ·4H 2 O) calcined at 200, 400, 600, and 800 °C. The potential use of calcined hydrotalcite as adsorbent for the recovery of Cd(II) species from aqueous solution was evaluated by an adsorption process in batch experiments at ambient temperature. The materials were characterized by XRD analysis, FT-IR spectroscopy, N 2 adsorption, SEM, and XPS technique. Results indicated that the structure and textural properties of hydrotalcite were obviously changed via thermal treatments of calcinations, and the surface area of the samples was increased with the raise of calcination temperature. The pH of solution after adsorption was increased in different degrees due to hydrolysis of MgO in hydrotalcite, leading to improving adsorption of Cd(II). The hydrotalcite calcined at 600 °C presented the maximum equilibrium adsorption capacity, and the adsorption process could be well described by Freundlich isotherm and pseudo-second-order kinetics model. Meanwhile, it could be found that the damaged interlayer structure of hydrotalcite calcined at high temperature could be restored during the adsorption process due to better memory effect of hydrotalcite, and Cd(II) was adsorbed on the hydrotalcite surface as the precipitations of Cd(OH) 2 and CdCO 3 .