白腐真菌表面铁氧化物的形成及其对染料亚甲基蓝的吸附  

Formation of iron oxides on the surface of white-rot fungus and their adsorption to dye methylene blue

作　　者：刘洁 李宁杰[1,2] 杨锐[1,2] 杨昆 唐新媛 LIU Jie;LI Ning-jie;YANG Rui;YANG Kun;TANG Xin-yuan(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)

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

出　　处：《桂林理工大学学报》2021年第4期858-863,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,桂科AD18126018)。

摘　　要：对高含铁环境下白腐真菌的生长及其菌丝表面形成的铁氧化物的理化性质进行了分析,并探讨该环境下生成的铁氧化物对染料亚甲基蓝的吸附及其影响因素,结合吸附动力学模型分析该吸附行为。结果表明,在高含铁环境中白腐真菌能正常生长,并在菌丝表面形成了含α-FeOOH和β-FeOOH的铁氧化物,菌丝体表面的羟基基团参与了FeOOH的成核。菌丝体表面铁氧化物对亚甲基蓝的吸附率受铁氧化物负载量的影响,当初始Fe^(3+)浓度为276 mg/L时,吸附率最高,为50%;亚甲基蓝的初始浓度为12.5 mg/L时,吸附率最高,为52%;pH为4~10时,吸附效果均较好,最大为50.29%;吸附最适温度为20℃,吸附率为39.92%,这说明负载铁氧化物的菌球对亚甲基蓝的吸附适用范围广。动力学研究证实了准二级动力学方程更适用对亚甲基蓝的吸附过程。This study analyzed the growth of white-rot fungus and the physicochemical properties of iron oxide formed on the surface of the mycelium under high iron concentration.The adsorption of the dye methylene blue by the iron oxide loaded on the its influencing factors was discussed.The adsorption behavior was combined with the adsorption kinetic model.The result showed that white-rot fungus could grow normally in high-iron environment and could form iron oxides containingα-FeOOH andβ-FeOOH on the surface of the mycelium,and the hydroxyl groups on the surface of the mycelium participated in the nucleation of FeOOH.The adsorption rate of methylene blue by iron oxide on the surface of mycelium was affected by the loading amount of iron oxide.When the initial Fe^(3+)concentration was 276 mg/L,the adsorption rate of methylene blue was up to 50%.When the initial concentration of methylene blue was 12.5 mg/L,the adsorption rate was highest(52%).When the pH was 4-10,the adsorption effect was good with the maximum of 50.29%.When optimal temperature for adsorption was 20℃,the adsorption rate was 39.92%.The iron oxide-loaded mycelium had a wide range of application in the adsorption of methylene blue.Kinetic studies confirms that the quasi-second-order kinetic equation is more suitable in the adsorption process of methylene blue.

关 键 词：白腐真菌 铁氧化物 吸附 亚甲基蓝 

分 类 号：X703[环境科学与工程—环境工程]