反硝化生物滤池出水SMP对Cu^(2+)的螯合特性  

Metal Chelating Mechanism of Cu^(2+) by SMP of Denitrifying Biological Filters

作　　者：周雨 姜芳媛 石先阳[1] ZHOU Yu;JIANG Fangyuan;SHI Xianyang(Anhui Province Key Laboratory of Wetland Ecosystem Protection and Restoration,School of Resources and Environmental Engineering,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学资源与环境工程学院湿地生态保护与修复安徽省重点实验室,安徽合肥230601

出　　处：《环境科学与技术》2021年第4期1-8,共8页Environmental Science & Technology

基　　金：安徽省重大科技专项(202003a07020014)。

摘　　要：该文以不同碳源反硝化生物滤池(DNBF)出水可溶性微生物产物(SMP)为对象,研究不同温度和pH条件下SMP对Cu^(2+)的螯合能力。结果表明,SMP螯合Cu^(2+)的过程符合Langmuir、Freundlich和Temkin吸附等温曲线;在温度为35℃和pH为5时,以乙酸钠为碳源的DNBF出水中SMP螯合Cu^(2+)的能力最强,最大吸附量为0.574 g/g。采用冷场发射式扫描电镜、傅里叶红外光谱仪和三维荧光光谱仪等表征SMP,显示SMP与Cu^(2+)作用前后的形貌特征发生了明显变化。SMP与Cu^(2+)发生螯合作用主要依赖于蛋白质、多糖和腐殖质中富含的-COOH、-NH_(2)和-OH等官能团。The chelating ability of SMP on Cu^(2+)in the effluent of denitrifying biological filter(DNBF)fed with different carbon sources was investigated under different temperature and pH conditions.The results showed that the Cu^(2+)chelation process of SMP followed Langmuir,Freundlich and Temkin adsorption isotherms.At the temperature of 35℃and pH of 5,SMP from DNBF effluent with sodium acetate as the carbon source exhibited the strongest chelating ability for Cu^(2+),and the maximum adsorption capacity reached 0.574 g/g.Cold-field emission scanning electron microscopy(SEM),Fourier infrared spectroscopy(FT-IR)and three-dimensional fluorescence spectroscopy(3 D-EEM)were used to characterize SMP,which indicated that the SMP morphology changed significantly before and after interaction with Cu^(2+).The chelation of SMP with Cu^(2+)mainly depends on the-COOH,-NH_(2) and-OH functional groups which are abundant in protein,polysaccharide and humus.

关 键 词：反硝化生物滤池 可溶性微生物产物 金属螯合性 铜离子 

分 类 号：X703[环境科学与工程—环境工程]