Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China.
Department of Environmental Engineering, Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory, Wuhan University, Wuhan 430079, China.
Water Res. 2014 Dec 1;66:473-485. doi: 10.1016/j.watres.2014.08.039. Epub 2014 Sep 3.
Mesoporous silica SBA-15 supported iron and cobalt catalysts (Fe-Co/SBA-15) were prepared and used in the electrochemical (EC) enhanced heterogeneous activation of peroxydisulfate (PDS, S2O8(2-)) process for the removal of Orange II. The effects of some important reaction parameters such as initial pH, current density, PDS concentration and dosage of Fe-Co/SBA-15 catalysts were investigated. The results showed that the decolorization efficiency was not significantly affected by the initial pH value, and it did increase with the higher PDS concentration, current density and Fe-Co/SBA-15 dosage. Both the sulfate radical (SO4(·-)) and the hydroxyl radical (OH) are considered as the primary reactive oxidants for the Orange II decolorization. The Fe-Co/SBA-15 catalyst maintained its high activity during repeated batch experiments. The intermediate products were identified by GC-MS analysis and a plausible degradation pathway is proposed accordingly. The removal efficiencies of chemical oxygen demand (COD) and total organic carbon (TOC) were 52.1% and 31.9%, respectively after 60 min of reaction time but reached 82.9% and 51.5%, respectively when the reaction time was extended to 24 h. Toxicity tests with activated sludge indicated that the toxicity of the solution increased during the first 30 min and then decreased as the oxidation proceeded.
介孔硅 SBA-15 负载的铁钴催化剂（Fe-Co/SBA-15）被制备并用于电化学（EC）增强过一硫酸盐（PDS，S2O8(2-)）过程的非均相活化，以去除橙色 II 染料。考察了一些重要的反应参数，如初始 pH 值、电流密度、PDS 浓度和 Fe-Co/SBA-15 催化剂用量等对反应的影响。结果表明，初始 pH 值对脱色效率的影响不显著，而随着 PDS 浓度、电流密度和 Fe-Co/SBA-15 用量的增加，脱色效率逐渐提高。硫酸根自由基（SO4(·-))和羟基自由基（OH）被认为是橙色 II 脱色的主要活性氧化剂。在重复批实验中，Fe-Co/SBA-15 催化剂保持了较高的活性。通过 GC-MS 分析鉴定了中间产物，并据此提出了可能的降解途径。在 60 min 的反应时间后，化学需氧量（COD）和总有机碳（TOC）的去除效率分别为 52.1%和 31.9%，但当反应时间延长至 24 h 时，去除效率分别提高至 82.9%和 51.5%。用活性污泥进行的毒性测试表明，溶液的毒性在最初 30 min 内增加，然后随着氧化的进行而降低。
