Oxidation of disinfectants with Cl-substituted structure by a Fenton-like system Cu2+/H2O2 and analysis on their structure-reactivity relationship
2016
Peng, Jianbiao | Li, Jianhua | Shi, Huanhuan | Wang, Zunyao | Gao, Shixiang
As widely used chemicals intended to protect human being from infection of microorganisms, disinfectants are ubiquitous in the environment. Among them chlorine-substituted phenol is a basic structure in many disinfectant molecules. Removal of these pollutants from wastewater is of great concern. The oxidative degradation of antimicrobial agents such as triclosan, chlorofene, and dichlorofene by a Fenton-like system Cu²⁺/H₂O₂ was examined. Reaction conditions such as temperature, initial concentrations of H₂O₂ and Cu²⁺, and pH were optimized using triclosan as a representative. The degradation kinetics of the above disinfectants followed pseudo-first-order kinetics under the investigated conditions. Fourteen chlorophenols (CPs) with different chlorine substitution were also studied to evaluate the influence of molecular structure on the degradation process in the Cu²⁺/H₂O₂ system. Fourteen structure-related parameters were calculated using Gaussian 09 program. A quantitative structure-activity relationship (QSAR) model was established using SPSS software with measured rate constant (k) as dependent variable and calculated molecular descriptors as independent variables. A three-parameter model including energy of HOMO (E ₕₒₘₒ), molar heat capacity at constant volume (C ᵥ ᶿ), and the most positive net charge of hydrogen atoms (qH⁺) was selected for k prediction, with correlation coefficient R ² = 0.878. Analyses of the model demonstrated that the C ᵥ ᶿ was the most significant factor affecting the k of chlorophenols. Variance analysis and standard t-value test were used to validate the model.
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