利用傅里叶变换红外光谱(FTIR)研究了无烟煤在低温(〈100℃)条件下缓慢氧化对其表面亲/疏水性的影响。对煤样中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,煤表面亲水性含氧官能团(-OH、Ar-O-Ar'、R-O-R'、-COOH)的吸收峰面积都有不同程度的增加,而疏水性官能团(-CH、-CH2、-CH3)的吸收峰面积呈减小趋势;根据疏水性和亲水性特征官能团的吸光度计算煤样表面亲水指数Hi与测得煤表面接触角θ的变化规律一致。
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.