College of Materials Science and Engineering, Hunan University, Changsha 410082, China E-mail:
Water Sci Technol. 2017 Jun;75(12):2784-2790. doi: 10.2166/wst.2017.157.
This study proposed an integrated technique of reduction coupled with an oxidation process in order to acquire simultaneously both decolorization and mineralization of orange II under the condition of microwave-assisted milling. Experimental variables of initial dye concentration, iron dosage, microwave power, solution pH and initial HO concentration were systematically studied. Under the optimal operational parameters (100 mg/L aqueous solution of pH 3 containing 400 mg/L HO while controlling microwave power at 400 W), the results showed that the decolorization efficiency is up to 91% after reaction for 2 min and the total organic carbon removal efficiencies were 72.7% and 80.5% at a reaction time of 10 min and 60 min, respectively. It indicated that the decolorization and mineralization of orange II were largely enhanced by the reduction of zero-valent iron in the ball milling process and the oxidation of hydroxyl radicals generated by hydrogen peroxide. It suggested that microwave-assisted ball milling technology has potential application for degradation of azo dye in wastewater.
本研究提出了一种还原偶联氧化的集成技术，以便在微波辅助研磨条件下同时获得橙色 II 的脱色和矿化。系统研究了初始染料浓度、铁剂量、微波功率、溶液 pH 值和初始 HO 浓度等实验变量。在最佳操作参数下（pH 3 的 100mg/L 水溶液中含有 400mg/L HO，同时控制微波功率为 400W），结果表明，反应 2 分钟后脱色效率达到 91%，反应 10 分钟和 60 分钟时总有机碳去除率分别达到 72.7%和 80.5%。这表明，在球磨过程中零价铁的还原和过氧化氢产生的羟基自由基的氧化大大增强了橙色 II 的脱色和矿化。这表明微波辅助球磨技术在废水处理中具有潜在的应用价值。
