金属离子对神府煤的光催化氧化特性研究

STUDY ON PHOTO-OXIDATION CHARACTERISTIC OF METAL IONS TO SHENFU COAL

将通过离子交换加入不同金属离子的神府煤样在光老化箱中加速氧化,利用红外光谱对其产物结构进行分析,并结合氧化过程中产生的二氧化碳量和溶胀度变化量进行分析,结果表明:稀土金属离子型化合物的加入有利于煤中腐植酸类物质的形成,而且La3+催化效果较为显著;过渡金属离子型化合物的加入有利于加速煤样的光催化氧化降解过程,其中促进作用更为显著;结果还表明:金属离子与腐植酸的配位稳定作用,延缓了CO2的生成,但加速了腐植酸的生成,进而起到光敏化的作用.

Shenfu coal modified by ion exchange adding different metal ions was catalytically oxidized photo-oxidation reactor. Release amount of CO2 and change of swelling degree during oxidation and the struture of oxidation products were studied. The results indicate that rare-earth metal ionic compounds are favor of humic acid substance formation and La^3＋ is more excellent; transition-metal ionic compounds can accelerate photo-oxidation degradation of coal and Ni^2＋ is more remarkable. In addition,results reveal that coordinate stabilization between metal ion and humic acid plays a role of photo-sensitizer,so formation of CO2 is delayed while formation of humic acid is quickened.