School of Environmental Science and Engineering, South China University of Technology/The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education/ The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China.
Water Sci Technol. 2011;64(3):754-9. doi: 10.2166/wst.2011.708.
Decolorization of anthraquinone dye Reactive Blue 19 (RB19) with sulfate radicals generated in situ from persulfate and zero-valent iron (ZVI) was investigated. The effects of initial solution pH, initial concentration of RB19, ZVI and persulfate, reaction temperature and common dissolved anions were studied. 100% color removal efficiency and 54% TOC removal efficiency were achieved in 45 min with an initial RB19 concentration of 0.1 mM under typical conditions (pH 7.0, 0.8 g L(-1) ZVI, 10 mM persulfate and 30 C). The decolorization efficiency of RB19 increased with higher iron dosage, higher initial persulfate concentration, and higher reaction temperature. It is also an acid driven process. The decolorization process followed pseudo-first order kinetics and the activation energy was 98.1 kJ mol-1. RB19 decolorization was inhibited by common dissolved anions such as CL-, NO3-, H2PO4- and HCO3- since they reacted with sulfate radicals that retarded the oxidation process. The experiment demonstrated that the combination of persulfate and ZVI was a promising technology for the decolorization of dye wastewater.
采用过硫酸盐和零价铁（ZVI）原位生成的硫酸根自由基对蒽醌染料活性蓝 19（RB19）进行脱色研究。考察了初始溶液 pH 值、RB19 初始浓度、ZVI 和过硫酸盐初始浓度、反应温度和常见溶解阴离子的影响。在典型条件下（pH 值 7.0、0.8 g/L ZVI、10 mM 过硫酸盐和 30°C），当 RB19 初始浓度为 0.1 mM 时，45 min 内可达到 100%的脱色率和 54%的TOC 去除率。RB19 的脱色效率随铁投加量、过硫酸盐初始浓度和反应温度的升高而增加。该过程也受酸度驱动。脱色过程遵循准一级动力学，活化能为 98.1 kJ/mol。由于氯离子、硝酸根、磷酸氢根和碳酸氢根等常见溶解阴离子会与硫酸根自由基反应，从而阻碍氧化过程，因此 RB19 的脱色受到常见溶解阴离子的抑制。实验表明，过硫酸盐和 ZVI 的组合是一种很有前途的染料废水脱色技术。
