低温氧化对无烟煤表面亲(疏)水性的影响

 摘要：利用傅里叶变换红外光谱（FTIR）研究了纯煤在低温（＜100℃）条件下缓慢氧化的过程。通过对煤官能团特征峰面积的变化分析，结果表明：随氧化时间的增加，羟基（-OH）峰面积先减小后增加，醚氧基（Ar-O-Ar’、R-O-R’）呈增加趋势，羧基（-COOH）从无到有；芳烃（-CH）和脂肪烃（-CH2）峰面积减少的趋势；芳核中骨架C=C双键没有参与氧化反应，进而推测出煤的低温氧化的反应历程。同时，根据疏水性和亲水性特征官能团的吸光度计算出煤表面亲水指数，发现与测得煤表面接触角的变化规律是一致的。

Research on Low Temperature Oxidation Affected to Hydrophilicity and Hydrophobicity of Anthracite Surface

Fourier transform infrared spectrometer(FTIR) was applied to study the slow oxidation of the anthracite affected to the hydrophilicity and hydrophobicity of the anthracite surface under the conditions of the low temperature(<100℃).The analysis results of the peak area variation of the function group features in the coal sample showed that the oxidation time increased,the absorption area of the hydrophilicity oxygen functional groups(-OH,Ar-O-Ar′,R-O-R′,-COOH) of the anthracite surface would be increased in different degree and the absorption peak area of the hydrophobicity functional groups(-CH,-CH2,-CH3) would be reduced in tendency.According to the absorbance of the hydrophilicity and hydrophobicity feature function groups,the hydrophobic index Hi of the coal sample surface was calculated and would have a same variation law to the measured contact angle of the coal sample surface.