The extraction process for p-nitrophenol(PNP)industrial wastewater by tributyl phosphate(TBP)-kerosene system is studied.TBP and PNP mainly forms a 1∶1 complex,the extraction process ΔH=-28.21 kJ·mol-1,and the presence of salt in wastewater has a positive effect on the complex extraction.The impacts of extractant concentration,stirring speed,and organic phase/water phase volume ratio(O/A)on the removal rates of phenol and chemical oxygen demand(COD)are investigated by using single factor experiment.According to the results from single factor experiment,a three-factor three-level Box-Behnken model is designed for response surface optimization experiment.Experimental results show that the optimal process conditions after the response surface optimization are as follows:the concentration of TBP is 28%,the stirring speed is 187 r·min-1,and O/A is 0.6.Under these conditions,the removal rate of phenol is 99.97%,and phenol content in the raffinate water phase after single stage extraction is 0.12 mg·L-1.
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