Pleurotus ostreatus对直接耐晒翠蓝染料溶液脱色的研究

Decoloration of direct fast turquoise blue with white rot fungi Pleurotus ostreatus

研究Pleurotus ostreatus(白腐真菌)对直接耐晒翠蓝GL染料溶液的脱色性能。结果表明,Pleurotus os-treatus能有效用于直接耐晒翠蓝染料溶液的脱色,pH值为5、温度为22℃左右脱色效果最佳;C溶液/C培养基>20%时,增大营养物浓度对脱色率无显著影响;Pleurotus ostreatu对GL的生物吸附符合Langmuir吸附模式,饱和吸附量为20mg/g(湿菌体);并可用Freundlich吸附模型表达,吸附动力学可用准二级速率方程描述;脱色是通过菌体吸附和菌酶降解双重机制实现的。

This paper studies the performance of white rot fungi Pleurotus ostreatus in decolorizing the dye solution of direct fast turquoise blue as well the effects of pH value,temperature and concentration of nutriments on the decoloration efficiency.It shows that the solution of direct fast turquoise blue is decolorized efficiently with Pleurotus ostreatus under suitable conditions where the optimum pH value and temperature are about 5 and 22 ℃,respectively.Moreover,when the ratio of nutriment concentration in solution to liquid medium of Pleurotus ostreatus is greater than 20%,the increase of nutriment concentration in solution has no remarkable effect on decoloration efficiency.The bio adsorption of Pleurotus ostreatus to the dye accords with Langmuir adsorption isotherm,and the saturated adsorption capacity of Pleurotus ostreatus is 20 mg dye/g gross biomass in the optimum condition.Furthermore,Freundlich adsorption model may be used to represent the bio adsorption,too.The adsorption kinetics of Pleurotus ostreatus for direct fast turquoise blue accords with the pseudo second rate equation.It is verified that decoloration of the dye solution by Pleurotus ostreatus is achieved by the mechanisms of both adsorption and biodegradation.