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Citation: ZHOU Yu, HE Yuan, ZHOU Wenjun. Adsorption of Palladium by Pectin and Its Application in Organic Synthesis[J]. Chinese Journal of Applied Chemistry, ;2015, 32(12): 1402-1409. doi: 10.11944/j.issn.1000-0518.2015.12.150207 shu

Adsorption of Palladium by Pectin and Its Application in Organic Synthesis

1.
College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang, Sichuan 641112, China

Corresponding author: ZHOU Wenjun,
Received Date: 18 June 2015
Available Online: 12 August 2015
Fund Project: 四川省教育厅培育项目(12ZZ012) (12ZZ012)青年基金项目(11ZB074) (11ZB074)内江师范学院博士科研启动费(2012B05)资助项目 (2012B05)

The adsorption of palladium from aqueous solution by pectin was studied. The effect of solution pH value,temperature, pectin dosage, contact time and initial concentration of palladium solution on the adsorption was investigated. The kinetics data were analyzed by the Pseudo-First-order,Pseudo-Second-order and Intraparticle Diffusion models. The equilibrium data were simulated using Langmuir,Freundlich,and Temkin isothermal equations. The results show that pectin has good adsorption ability and the adsorption ratio is as high as 96%. With the best pH of 6.5 and the best temperature of 50℃,the adsorption capacity decreases with the increase of the pectin dosage,while it increases as the initial concentration of palladium solution increases. The adsorption kinetics of palladium obeys the Pseudo-Second-order model to show that this is a chemical adsorption. The isotherm adsorption is fitted in the Freundlich equation. Gibbs free energy is negative,the enthalpy change is 3.23 kJ/mol and the entropy change is 13.32 J/(mol·K),showing that it is a spontaneous endothermic process. The adsorbed palladium was used as the catalyst for Suzuki reaction with a good catalytic activity.
- pectin,
- palladium,
- adsorption,
- Suzuki reaction
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