A Reusable Biosorbent Using Ca-Alginate Immobilized Providencia vermicola for Pd(II) Recovery from Acidic Solution
2020
Xie, Jianping | Feng, Ningning | Wong, Yoon-wah | Guo, Ziwen | Dong, Haigang | Cui, Hao | Wu, Haiyan | Qiu, Guanzhou | Liu, Xinxing
This study aimed to develop Ca-alginate immobilized Providencia vermicola as a reusable biosorbent to recover palladium ions from acidic solutions. To examine the adsorption characteristics and availability of Ca-alginate immobilized P. vermicola for Pd(II) recovery, several experiments such as SEM-EDX, FT-IR, isotherm, kinetics, fixed-bed columns, desorption, and reusability were conducted. The results of SEM-EDX and FT-IR analyses demonstrated that amino and carboxyl groups were the main contributors in the Pd(II) biosorption process and that hydroxyl and phosphate groups were also critical for Pd(II) adsorption. The adsorption isotherms could be well described by the Langmuir model, and the maximum adsorption capacity was 197.23 mg g⁻¹. Kinetic experiments suggested that the biosorbent reached adsorption equilibrium within 60 min. After adsorption, the Pd(II) bound to the Ca-alginate immobilized P. vermicola was easily desorbed with 0.1 M HCl. A regeneration test of this Ca-alginate immobilized P. vermicola biosorbent revealed that it could be used for at least five cycles with high adsorption capacity. These results indicated that Ca-alginate immobilized P. vermicola has the extraordinary potential to adsorb metal ions from industrial wastewater.
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