In this work, monochlorophenols (MCPs) isomers degradation was investigated by Co-doped g-C 3 N 4 (CCN) using peroxymonosulfate (PMS) as the oxidant. The effects of the doping amount of Co, the concentration of PMS, the loading of catalyst and initial pH of the solution on the catalyst activity were systematically studied. The results showed that MCPs could be degraded effectively by CCN/PMS system. The degradation reaction followed pseudo-first order kinetics. Sulfate radical (SO 4 − ) was found as the major active radicals in the degradation process. MCPs were degraded effectively with the degradation rate order of 2-chlorophenol (2-CP) > 3-chlorophenol (3-CP) > 4-chlorophenol (4-CP). Except for the influence of structural characteristics of MCPs, this degradation rate order was also related to the adsorption behavior of CCN, which was based on the intermolecular interaction. Based on the analysis of the degradation products of MCPs, 1,4-benzoquinone or chlorinated 1,4-benzoquinone had been found to be the main intermediates.
A Briggs-Rauscher oscillating system has been established for the identification of the isomers of monochlorophenol (MCPs). The samples were assessed, based on their different perturbations behavior’s, in the reaction, over the concentration range of 1.5 × 10 -8 to 1.25 × 10 -3 molL 1 . In the system; substrate malic acid, and a complex macrocyclic nickel [NiL](ClO 4 ) 2 catalyst were used. The obtained data have shown that individually injected isomers at the same concentration, give distinct perturbation behaviors. 2- Chlorophenol (2-CP) caused a change in period of oscillation, at the lower concentration but 3-Chlorophenol (3-CP) and 4-chlorophenol (4-CP) did not show their reactivity, while at the higher concentration, 2-CP quenching the oscillation that could not be regenerated, 3-CP show stability in the system, However, 4-CP caused the change in the period of active oscillation. Linear regression analysis relationships were found, in the change of oscillation period and the decrease of oscillation number to the increases of concentration of 2-CP and 3-CP. The detection of limits was 6.75 × 10 -8 molL -1 and 1 × 10 -3 molL -1 for 2-CP, and 4-CP respectively. The oxidizing process of 2-CP and 3-CP, described on the base of the suggested FCA (Furrow-Cervellati-Amadori) model. The formation of product of 2-CP and 4-CP in reaction was identified by UV-spectroscopy .
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