Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td align="left">Coal samples</td><td align="center">Beizao lignite</td><td align="center">Daliuta long flame coal</td><td align="center">Yushuwan gas coal</td><td align="center">Xinjulong fat coal</td><td align="center">Wugou coking coal</td><td align="center">Yangquan anthracite</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td align="left">Contact angle before deashing/°</td><td align="center">46.70</td><td align="center">59.47</td><td align="center">62.93</td><td align="center">62.66</td><td align="center">66.06</td><td align="center">68.14</td></tr><tr><td align="left">Contact angle after deashing/°</td><td align="center">50.13</td><td align="center">62.29</td><td align="center">64.39</td><td align="center">66.74</td><td align="center">67.92</td><td align="center">71.47</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Contact angles between coal sample and distilled water before and after deashing.

Journal of Analytical Methods in Chemistry

tab5

Table 5

Table 5: Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment 

Table 5 | Effects of Oxygen Element and Oxygen-Containing Functional Groups on Surface Wettability of Coal Dust with Various Metamorphic Degrees Based on XPS Experiment 