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以海洋微紫青霉(Penicillium janthinellum sp.)菌粉作为廉价生物吸附剂,对阴离子染料刚果红进行脱色研究,考察了菌粉粒径、pH、转速和盐浓度对菌粉脱色效果的影响。结果表明,菌粉粒径越小越有利于菌粉对刚果红的吸附,在pH为3.0、转速180 r/min的条件下菌丝球脱色效果较好,当NaCl的含量较低时(质量浓度<20g/L),NaCl的加入会对染料吸附有一定的促进作用。菌丝球吸附刚果红的吸附等温线数据可用Langmuir模型和Freundlich模型进行拟合,其中Langmuir模型能够更好的描述菌丝球的吸附行为,刚果红的最大吸附量为185.2mg/g。准2级动力学方程和颗粒内扩散模型可以较好地拟合吸附动力学数据,颗粒内扩散是菌粉吸附刚果红的主要限速步骤。
The decolorization of anionic dye Congo red was studied using Penicillium janthinellum sp. As a cheap biosorbent. The effects of particle size, pH, rotation speed and salt concentration on the decolorization efficiency were investigated. The results showed that the smaller the diameter of bacterial powder, the more conducive to the adsorption of Congo red powder. Under the conditions of pH 3.0 and rotation speed 180 r / min, the mycelial ball decolorization is better. When the content of NaCl is lower Concentration <20g / L), NaCl addition will have a certain role in promoting dye adsorption. The adsorption isotherm data of congo red can be fitted by Langmuir model and Freundlich model. The Langmuir model can better describe the adsorption behavior of mycelia. The maximum adsorption capacity of Congo red is 185.2mg / g. The quasi-second-order kinetic equation and intra-particle diffusion model can well fit the adsorption kinetics data. Intra-particle diffusion is the main rate-limiting step of bacterial powder adsorption of Congo red.