Zheng Shuran, Huang Haiwei, Zhang Renduo, Cao Lixiang
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, 510275, China.
Appl Microbiol Biotechnol. 2014 Oct;98(20):8729-36. doi: 10.1007/s00253-014-5862-9. Epub 2014 Jun 15.
The aim of this study was to investigate the potential to remove chromium (Cr) from aqueous solutions using the fruiting body of Auricularia polytricha. Batch experiments were conducted under various conditions, and different models were used to characterize the biosorption process. Results showed that, for both fresh and dried fruiting bodies of A. polytricha, removal efficiencies of Cr(VI) and total Cr reached maximum values at pH values of 1 and 2, respectively. The process of Cr(VI) removal by A. polytricha included the sorption process as well as the reduction of Cr(VI) to Cr(III). Spectra of X-ray photoelectron spectroscopy of the biosorbent revealed that most of the Cr loaded on the biomass surface was in the trivalent form. The Freundlich model fitted the isotherm process better than the Langmuir model in the concentration range examined. The pseudo-second-order model well described the adsorption process of Cr onto the biomass. The biosorption capacity of Cr(VI) by fruiting bodies was much higher than that by most of other biosorbents reported. The results suggest that the fruiting bodies of A. polytricha should be a promising biomaterial for Cr removal from water contaminated by the heavy metal.
本研究的目的是探究使用毛木耳子实体从水溶液中去除铬（Cr）的潜力。在各种条件下进行了批次实验，并使用不同模型来表征生物吸附过程。结果表明，对于新鲜和干燥的毛木耳子实体，Cr(VI)和总Cr的去除效率分别在pH值为1和2时达到最大值。毛木耳去除Cr(VI)的过程包括吸附过程以及将Cr(VI)还原为Cr(III)。生物吸附剂的X射线光电子能谱表明，负载在生物质表面的大部分Cr为三价形式。在所研究的浓度范围内，Freundlich模型比Langmuir模型更能拟合等温线过程。准二级模型很好地描述了Cr在生物质上的吸附过程。子实体对Cr(VI)的生物吸附容量远高于报道的大多数其他生物吸附剂。结果表明，毛木耳子实体应是从受重金属污染的水中去除Cr的一种有前景的生物材料。
