真菌生物吸附剂对酸性大红的吸附研究

Biosorption of Acid Red from Aqueous Solution by Fungal Biomass

以青霉菌菌体作为生物吸附剂对水中阴离子染料酸性大红进行生物吸附研究。考察菌体培养时间、溶液pH值和温度等因素对菌体吸附酸性大红的影响,探讨吸附平衡和吸附热力学特性。结果表明,培养时间为3d时,青霉菌对染料吸附能力最强。当溶液的pH值为2～3时,菌体对酸性大红吸附效果较好。在25～40℃时,菌体对染料的吸附等温线可用Langmuir方程表达;随着温度升高,饱和吸附量也随之增大。根据热力学函数关系计算出ΔH为31.53kJ/mol,25℃、30℃、35℃、40℃对应的ΔG均小于0,表明菌体对酸性大红的吸附是自发吸热过程。

The biosorption of acid red from aqueous solution, using the Penicilium sp. , was investigated in batch system. The dye biosorption on Penicilium sp. was investigated with different parameters, such as cultivation time, pH and temperatures. The fungal biomass showed maximum uptake at pH 2 - 3 and cultivation time of 3 days. The Langmuir and Freundlich isotherm models were applied to experimental equilibrium data and the Langmuir model better described the equilibrium dye uptake than the Freundlich model. Maximum adsorption capacities （q0） increased with increasing temperature in studied temperature range. AH was 31.53kJ · mol^-1 which indicated that the adsorption process is endothermic in the studied temperature ranges. Values for AG all lower than 0, showed that biosorption of dye on Penicilium sp. was spontaneous. Thermodynamic studies revealed that the biosorption process was successful, spontaneous and endothermic in nature.