Kinetic analysis of laccase catalyze phenolic and aniline compounds and detecting catechol in wastewater

Phenolic or aniline compounds were important pollutants in the industrial wastewaters to seriously polluted water environment.This research developed a detecting method of phenolic and aniline compounds based on the kinetic parameters of the substrates of laccase.Catalytic reaction between laccase and phenolic and aniline compounds was characterized using spectrophotometic method,which resulted 0-10 mg /L substrate reaction rate and calibration curve of substrate concentration and reaction rate.And then the non-volatile phenols in three kinds of coking wastewater were screened and the contents were detected.The result showed that polyhydric phenol,multi-amine and aminophenol were the main substrates of laccase.The optimum pH of phenols was around 7.0 and anilines 4.5-5.0,Km values of each substrates was 0.4-10 mmol /L.The calibration curve performed good first order kinetics linear relationship except benzidine with correlation coefficients above 0.96.Using laccase method,the contents of catechol in three kinds of coking wastewater were respectively detected to be 190.5,265.8 and 155.3 mg /L with recoveries ranged from 89.9% to 115.8%.