Abstract:
Abstract
Advanced oxidation processes (AOPs), which involve the activation of oxidant precursors (e.g.
hydrogen peroxide, persulphate, chlorine) as well as the generation of reactive radical species, have
emerged as promising alternatives for the treatment of organic pollutants. The current work was
conducted to estimate the efficiency of the Fe(II)/KPS/HA ternary system in the removal of the dye
Chlorzol Black (CB). Furthermore, a comparison between the Fe(II)/KPS system and the HA-
intensified system was examined. Fe(II) can activate persulphate to generate sulfate radicals (SO4•− )
and hydroxyl radicals (HO•) in the presence of HA. Radical generation was clearly enhanced by
hydroxylamine in solution, as a result of the efficiency of the Fe(III)/Fe(II) reaction promoted by HA.
The study of the effects of treatment conditions, such as pH, initial concentration of CB, KPS, Fe(II)
and HA was examined to estimate the performance of CB removal by Fe(II)/KPS/HA (T =25°C;
[CB]=10μM; [Fe(II)] =0.05mM; [KPS]=1mM; [HA]=1mM); pH=3.) (SO4•−) and (HO•) radicals
contributed comparably to CB degradation, as confirmed by radical scavenging tests. Moreover, the
addition of inorganic salts in large amounts, such as NaCl and NaNO₂, leads to a decreased efficiency
of the Fe(II)/KPS/HA process. On the other hand, NaNO₃ significantly accelerates the CB degradation
rate. Finally, humic acids presence reduced the degradation performance. The removal of Chlorazol
Black was monitored by UV/Vis spectrophotometry and its mineralization is evaluated by measuring
total organic carbon (TOC). The findings indicate that the best oxidation system used is
Fe(II)/KPS/HA.
