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摘要
This study demonstrated the composite adsorbent preparation by ligand of 5-tert-butyl-2-hydroxybenzaldehyde thiosemicarbazone immobilized onto mesoporous silica for efficient palladium (Pd(II)) detection, separation and recovery. The composite adsorbent enhanced the color formation upon the addition of different concentrations of Pd(II) based on the stable complex formation tendency by charge transfer (pi-pi transition) mechanism. The influence of different parameters such as solution pH, initial Pd(II) concentration, equilibration time, presence of diverse ions and reuses were evaluated and discussed systematically. The effective pH range for Pd(II) ions detection and sorption was at 3.50 and limit of detection was 0.13 mu g/L. This procedure allows the simultaneous determination and recovery of Pd(II) in synthetic samples consisting of diverse ions. The adsorption isotherm data were well fitted with the Langmuir model, and the maximum sorption capacity of the composite adsorbent was 171.65 mg/g, which was close to the equilibrium sorption capacity. The adsorbed Pd(II) was effectively extracted/eluted using acidic thiourea. The composite adsorbent retained functionality in spite of many chemical treatments during sorption-elution-recovery/regeneration cycles and the adsorbent could be used several cycles without significant deterioration in its original performances. The Pd(II) detection and sorption were also measured with simulated environmental solution, and the data confirmed the high selectivity to Pd(II), thus the composite adsorbent showing the potentiality for possible use in efficient detection, separation and recovery of Pd(II) from waste samples.
- 出版日期2015-3-31
