Adsorption of Safranine T by Aspergilus niger Biomass Waste

doi:10.13560/j.cnki.biotech.bull.1985.2017-0196

Abstract

Abstract: The present work aims to investigate the adsorption of dye safranine T by Aspergillus niger biomass waste from amylase production as novel composite adsorbent. The biomass waste was first characterized concerning its physico-chemical properties and then evaluated for its potential of adsorbing safranine T under different conditions，namely contact time，temperature，sorbent dosage，initial dye concentration and metal ion. The isotherms，dynamics，and thermodynamics were fitted with the above data，which showed that pseudo second order dynamics equation better described the adsorption with equilibrium achieved within 2 h，suggesting it was chemosorption，and film diffusion model was more suitable to explain the adsorption than internal diffusion model. Higher temperatures significantly promoted dye removal，and adsorption was both spontaneous（ΔG° < 0）and endothermic（ΔH° > 0）. The maximal monolayer adsorption capacity was calculated to be around 166.67 mg/g through Langmuir equation while Freundlich was more suitable to explain the adsorption，indicating that there were multiple absorptive sites on the surface of biomass waste. In addition，sorbent dosage and sodium ion concentration both impacted adsorption with the highest removal rate of 91%.

Key words: Aspergilus niger biomass waste, adsorption, safranine T, dynamic model, isotherm equation

WEI Jiang-mian, LU Lei-zhen, JIAO Guo-bao, LIU Jia-yang, LU Jun-he. Adsorption of Safranine T by Aspergilus niger Biomass Waste[J]. Biotechnology Bulletin, 2017, 33(10): 191-198.

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