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Citation: FEI De-Jun, LUO Jian-Hong, DANG Ya-Gu, LI Li, GU Heng, XIONG Zhong-Can. Extraction of Cr³⁺ with p-tert-Butylcalix[4] arene Acetate from Artificial Tannery Wastewater[J]. Chinese Journal of Applied Chemistry, ;2008, 25(2): 157-161. shu

Extraction of Cr³⁺ with p-tert-Butylcalix[4] arene Acetate from Artificial Tannery Wastewater

1.
College of Chemical Engineering, Sichuan University, Chengdu 610065

Corresponding author: DANG Ya-Gu,
Received Date: 6 February 2007
Available Online: 11 June 2007
Fund Project: 国家自然科学基金资助项目(20306018) (20306018)

The extraction of Cr³⁺ by a series of calixarenes and their derivatives was studied,and it was found that the extraction selectivity for Cr³⁺ of p-tert-butylcalix[4]arene acetate(H_nL_(O)) was outstanding.Based on the molecular structure of the cup aromatic hydrocarbon and its derivative,the mechanism of extraction of Cr³⁺ from the tannery wastewater for p-tert-butylcalix[4]-arene acetate(hydrolysis of cup[4]) was studied.The dependence of the participation ratio D on pH was studied,and it was confirmed that the extraction of Cr³⁺ performed via the hydrolysis of cup[4] obeyed the positive ion exchange mechanism,i.e.,Cr³⁺+H_nL_(O)→(CrH_n-1L_(O))²⁺+H⁺,and the apparent equilibrium constant of the extraction was 1.815×10³.The influence of temperature on D was also studied,and the enthalpy for the extraction was 69.89 kJ/mol,and the free energy-18.601 kJ/mol and the entropy 294.97 J/(mol·K).In addition K was calculated.The extraction was exothermic.The influences of major factors such as the initial concentration of Cr³⁺,the initial concentration of extractant,and the agitation rate on the participation ratio of Cr³⁺ were also investigated.The experimental results show that 85% of Cr³⁺ can be removed from tannery waste water with H_nL_(O) as extractant.
- hydrolysis of cup[4],
- extraction,
- mechanism,
- thermodynamic property,
- influence factor
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Extraction of Cr3+ with p-tert-Butylcalix[4] arene Acetate from Artificial Tannery Wastewater

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Extraction of Cr³⁺ with p-tert-Butylcalix[4] arene Acetate from Artificial Tannery Wastewater