风化煤中腐植酸的提取及其光谱学研究

HUMIC ACID EXTRACTION FROM WEATHERED COAL AND ITS SPECTROSCOPIC RESEARCH

探讨了从风化煤中提取棕腐酸和黑腐酸的方法,分别用紫外可见光谱、傅立叶变换红外光谱和三维荧光光谱对提取的腐植酸进行了表征,并说明了两种腐植酸结构上的差异.结果表明,棕腐植酸和黑腐植酸官能团种类相似,但含量总体是棕腐酸高于黑腐酸.两种腐植酸的紫外可见光谱在整个区间的吸光度是随着波长的增大而减小的混合光谱.两种腐植酸都有荧光效应,且无论随着浓度增加或者pH值增加,棕腐植酸和黑腐植酸的发光峰都有红移现象.

Extraction of brown humic acid and black humic acid from weathered coal was briefly introduced here. Two kinds of humic acid extracted were characterized respectively by ul- tra violet-visible spectra, Fourier transformed infrared spectra and three-dimensional fluorescence spectra and the structural differences of them were also illustrated. The structure of functional groups in them was similar but the content of functional groups in brown humic acid was higher than black humic acid overall which was gotten by Fourier transformed infrared spectra. The ab- sorbance ultra violet-visible spectra of both humic acids in the spectroscopy region was decreased with wavelength increasing, which was a mixed spectrum. Both kinds of humic acid had fluores- cent effect and the redshifts would happen no matter with concentration increasing or pH value increasing.