Dependence of Sulfadiazine Oxidative Degradation on Physicochemical Properties of Manganese Dioxides

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• 作者：Chengshuai Liu ; Lijia Zhang ; Fangbai Li ; Yan Wang ; Yun Gao ; Xiangzhong Li ; Weidong Cao ; Chunhua Feng ; Jun Dong ; Lina Sun
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2009
• 出版时间：December 2, 2009
• 年：2009
• 卷：48
• 期：23
• 页码：10408-10413
• 全文大小：193K
• 年卷期：v.48,no.23(December 2, 2009)
• ISSN：1520-5045

文摘

Manganese dioxides as active oxidants are the common minerals in environment, and different types of manganese dioxides may exhibit varied oxidative activity. In this study, eight manganese dioxides were used to conduct sulfadiazine (SD) oxidative degradation. SD can be oxidatively degraded and even mineralized by these manganese dioxides, and the toxicity of the SD sample can also be reduced significantly. The experiments in this study demonstrated that the kinetic reaction rate constant k values of SD degradation strongly depended on the physicochemical properties of different manganese dioxides, including average oxidation state (AOS), reductive potential (Eh), pH at the point of zero charge (pH_PZC), and apparent activation energy (E_a). The k values were positively correlated with the AOS and Eh, while negatively correlated with pH_PZC and E_a. The values of these physicochemical properties can be used to quantitatively estimate the oxidative activity of a manganese dioxide to some extent for better understanding of the degradation of organic pollutants with manganese dioxides.