12 Chlorophenols Dechlorination Water Treatment Using …
285
Fig. 12.4 Raman spectra of
reference iron oxides used
CPs with higher pKa values (2,4-DCP: pKa of 7.68 and 2,4,6-TCP: pKa of 5.97–
7.42) seemed to have a higher tendency for incorporation with the oxides hindering
the dechlorination process. Furthermore, when 2,4,6-TCP and 2,4-DCP were reacting with Ni/Fe, detection of lower amounts of magnetite and greater amounts of
passive oxides (akaganeite, haematite, lepidocrocite, wustite, goethite, ferrihydrite),
compared to the amounts of respective oxides detected with PCP and 2,3,4,6-TeCP,
provides evidence of decreased reactivity of 2,4,6-TCP and 2,4-DCP observed with
285
Fig. 12.4 Raman spectra of
reference iron oxides used
CPs with higher pKa values (2,4-DCP: pKa of 7.68 and 2,4,6-TCP: pKa of 5.97–
7.42) seemed to have a higher tendency for incorporation with the oxides hindering
the dechlorination process. Furthermore, when 2,4,6-TCP and 2,4-DCP were reacting with Ni/Fe, detection of lower amounts of magnetite and greater amounts of
passive oxides (akaganeite, haematite, lepidocrocite, wustite, goethite, ferrihydrite),
compared to the amounts of respective oxides detected with PCP and 2,3,4,6-TeCP,
provides evidence of decreased reactivity of 2,4,6-TCP and 2,4-DCP observed with