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首页> 外文期刊>Applied Microbiology and Biotechnology >Biosorption behavior and mechanism of heavy metals by the fruiting body of jelly fungus (Auricularia polytricha) from aqueous solutions
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Biosorption behavior and mechanism of heavy metals by the fruiting body of jelly fungus (Auricularia polytricha) from aqueous solutions

机译：水溶液中果冻真菌子实体对重金属的生物吸附行为及其机理

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摘要

The aim of this study was to investigate the bio-sorption characteristics of Cd ~(2+), Cu ~(2+), and Pb ~(2+) by the fruiting body of jelly fungus Auricularia polytricha. Batch experiments were conducted to characterize the kinetics, equilibrium, and mechanisms of the biosorption process. Optimum values of pH 5, biomass dosage 4 gL ~(-1), and contact time 60 min provided maximum biosorption capacities of A. polytricha for Cd ~(2+), Cu ~(2+), and Pb ~(2+) of 63.3, 73.7, and 221 mg g ~(-1), respectively. The maximum desorption was achieved using 0.05 mol L ~(-1) HNO _3 as an elute. The fruiting body was reusable at least for six cycles of operations. The pseudo-second-order model was the best to describe the biosorption processes among the three kinetic models tested. Freundlich and Dubinin-Radushkevich models fitted the equilibrium data well, indicating a heterogeneous biosorbent surface and the favorable chemisorption nature of the bio-sorption process. A Fourier transform infrared spectroscopy analysis indicated that carboxyl, amine/hydroxyl, amino, phosphoryl, and C-N-C were the main functional groups to affect the biosorption process. Synergistic ion exchange and surface complexation were the dominant mechanisms in the biosorption process. The present work revealed the potential of jelly fungus (fruiting body of A. polytricha) to remove toxic heavy metals from contaminated water.
机译：这项研究的目的是研究果冻木耳的子实体对Cd〜（2 +），Cu〜（2+）和Pb〜（2+）的生物吸附特性。进行批处理实验以表征生物吸附过程的动力学，平衡和机理。 pH 5的最佳值，生物量4 gL〜（-1）和60分钟的接触时间提供了poly藜对Cd〜（2 +），Cu〜（2+）和Pb〜（2+）的最大生物吸附能力。 ）分别为63.3、73.7和221 mg g〜（-1）。使用0.05 mol L〜（-1）HNO _3作为洗脱液可实现最大脱附。子实体至少可重复使用六个周期。拟二级模型最能描述所测试的三个动力学模型中的生物吸附过程。 Freundlich和Dubinin-Radushkevich模型很好地拟合了平衡数据，表明生物吸附剂表面不均一，并且生物吸附过程具有良好的化学吸附性质。傅里叶变换红外光谱分析表明，羧基，胺/羟基，氨基，磷酰基和C-N-C是影响生物吸附过程的主要官能团。协同离子交换和表面络合是生物吸附过程中的主要机制。目前的工作揭示了果冻真菌（A. polytricha的子实体）从污染水中去除有毒重金属的潜力。

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