pH值对有机蒙脱土吸附苯酚的影响

利用十六烷基三甲基溴化铵(HDTMA)改性的蒙脱土来处理含酚废水，了解pH值对有机蒙脱土吸附苯酚的影响．结果表明：不论是酸性还是碱性含酚水溶液，加入有机蒙脱土后其pH值都趋向中性，因此，有机蒙脱土对酸碱具有良好的缓冲能力．在相同pH条件下，吸附在有机蒙脱土上苯酚的数量随着其改性量的提高而增加．在碱性条件下，被有机蒙脱土吸附的苯酚可以发生解吸，pH值愈高，有机蒙脱土吸附的苯酚数量愈少，因此，吸附在有机蒙脱上上的苯酚在碱性条件下是不稳定的．通过碱再生有机蒙脱土又能吸附水溶液中的苯酚，但是其吸附苯酚的能力有所下降．

AFFECT OF pH ON ADSORPTION OF PHENOL TO ORGANIC MONTMORILLONITE

In order to probe the affent of pH on adsorptive capacity of phenol to modified montmorillonite,the natural montmorillonite was modified with different amounts of hexadeeyltrimethylammonium bremide (HDTMA) according to its cation exchange capacity (CEC) and was used to treat phenolic wastewater.The results of experiments showed that organic montmorillonite could strongly neutralize acidic or alkali phenolic wastewater.If more mounts of HDTMA were exchanged in montmorillonite,more mounts of phenol were adsotrbed under same pH.Amounts of phenol adsorbed to organic montmorillonite decreased when pH became high.Thus,phenol asdorbed organic montmorillonite could be regenerated under high pH circumstances.Alkali regenerated organic montmorillonite could adsorb phenol again though its adsorption capability of phenol decreased lightly.