机械力化学活化对新疆风化煤腐植酸活性的影响OA

To enhance the activity of humic acid(HA)derived from weathered coal through alkali extraction and acid precipitation,a mechanochemical activation strategy utilizing ball milling technology was applied to Xinjiang-sourced weathered coal.The optimal mechanochemical activation parameters were determined through a single-factor experimental methodology,which was followed by a comparative spectroscopic characterization of raw and activated weathered coal samples using Fourier-transform infrared spectroscopy(FTIR)and ultraviolet-visible spectroscopy(UV-Vis).The results show that the optimal mechanochemical activation parameters are a 105 min milling dura-tion,a 25 g∶1 g ball-to-powder mass ratio,and a 300 r/min rotational speed.Post-activation analy-ses reveal a 14.26%increase in HA extraction yield compared to untreated coal,which is accompa-nied by a 10.12%rise in total HA content and a 25.01%enhancement in the free HA fraction.Fur-thermore,the overall molecular weight of humic acid increases after activation.Concurrently,the structural integrity of aliphatic side chains are disrupted,while oxygen-containing functional groups are enriched,and the aromatic condensation within the molecular framework is enhanced.This study demonstrates the feasibility of mechanochemical activation of humic acid in weathered coal without the addition of catalysts/activators.It explores the mechanism by which mechanochemical activation enhances the activity of humic acid,providing a theoretical reference for subsequent in-depth studies of more detailed activation principles.