不同条件下白腐真菌多糖调控合成的铁(氢)氧化物的特征  

Characteristics of iron(hydrogen)oxides regulated by white-rot fungus polysaccharides under different conditions

作　　者：李宁杰[1,2,3] 王小洁 刘洁 杨锐 陈刘[1,2,3] LI Ningjie;WANG Xiaojie;LIU Jie;YANG Rui;CHEN Liu(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,China;Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541006,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Areas,Guilin University of Technology,Guilin 541006,China;China Railway Construction Eco-Environment Co.,Ltd.,Chongqing 400711,China)

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006 [2]桂林理工大学广西环境污染控制理论与技术重点实验室,广西桂林541006 [3]桂林理工大学岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541006 [4]中铁建生态环境有限公司,重庆400711

出　　处：《桂林理工大学学报》2024年第1期143-148,共6页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(51608142);广西科技计划项目(2018GXNSFGA281001,桂科AD19110151,2016GXNSFBA 380076)。

摘　　要：对白腐真菌胞外多糖在铁(氢)氧化物的生物形成过程中的作用展开具体研究,使用傅里叶红外光谱仪研究了不同多糖浓度、陈化时间、Fe^(3+)初始浓度、矿化体系pH和陈化温度条件下白腐真菌胞外多糖调控形成的铁(氢)氧化物的特征,探究了在不同条件下白腐真菌生物矿化的铁(氢)氧化物的晶型组成和不同相之间的转化规律。结果表明:适当增大多糖含量可促进铁(氢)氧化物在多糖分子中成核,且陈化过程中铁(氢)氧化物的晶型和结晶程度均会发生变化;Fe^(3+)初始浓度的升高有助于提高铁(氢)氧化物羟基结合态的稳定程度;酸性条件下有利于α-FeOOH的形成,而在碱性条件下则有利于α-Fe_(2)O_(3)的形成;温度的适当升高有利于Fe—O结晶度的提高,温度的进一步升高有利于铁(氢)氧化物转化成更稳定的相。This paper aims to investigate the role of white-rot fungus extracellular polysaccharides in the biogenesis of iron(hydrogen)oxides.Fourier transform infrared spectroscopy(FT-IR)was used to study the characteristics of iron(hydrogen)oxides regulated by the extracellular polysaccharide of white-rot fungus under different polysaccharide concentrations,different aging time,different initial concentrations of Fe^(3+),different pH values of mineralization system and different aging temperature.The crystal composition and transformation between different phases of iron(hydrogen)oxides biomineralized by white-rot fungus under different conditions were investigated.The results showes that the nucleation of iron(hydrogen)oxides in polysaccharides is promoted by increasing the content of polysaccharides,and the crystal type and degree of iron(hydrogen)oxides changed during aging.The increase of the initial concentration of Fe^(3+)helped to improve the stability of the hydroxyl binding state of iron(hydrogen)oxides.The formation ofα-FeOOH is favorable under acidic condition,while the formation ofα-Fe_(2)O_(3) is favorable under alkaline condition.An appropriate increase in temperature is beneficial to the improvement of Fe—O crystallinity,and a further increase in temperature favored the conversion of iron(hydrogen)oxides into a more stable phase.Those results can provide references for revealing the biological formation process of iron(hydrogen)oxides.

关 键 词：生物矿化 铁(氢)氧化物 多糖 白腐真菌 

分 类 号：X172[环境科学与工程—环境科学] Q936[生物学—微生物学]