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在无隔膜电解槽中,以NaCl为电解质,利用形稳阳极(DSA)产生的羟基自由基(·OH)和原位电生成的活性氯氧化降解磺胺嘧啶(Sulfadiazine,SD)模拟废水。通过高效液相色谱分析SD及其产物含量变化,水杨酸捕集羟基自由基法测定·OH的浓度,探讨工艺参数对·OH、氯离子、余氯、总氯和总有机碳(TOC)去除率的影响。结果表明,反应10 min后SD去除率达100%,反应4 h后溶液TOC明显下降;反应4 h后,pH=3、4、8、8.5、10和12的反应体系中TOC去除率分别为29%、46%、55%、61%、52%和47%,峰值出现在pH=8.5时;提高电流密度、电解质NaCl浓度及降低SD初始质量浓度可增大TOC去除率。该实验最优工艺条件为:pH=8.5,外加NaCl 0.025 mol/L,电流密度20 mA/cm2,初始质量浓度100 mg/L SD,经4 h的电化学氧化降解,TOC去除率达到66%。
In a non-membrane electrolytic cell, NaCl was used as electrolyte to decompose Sulfadiazine (SD) simulated wastewater by hydroxyl radical (· OH) generated by the shape stable anode (DSA) and active chlorine generated by in situ generation. The content of · SD and its product were analyzed by high performance liquid chromatography (HPLC). The concentration of · OH was determined by salicylic acid capture hydroxyl radical method. The effects of process parameters on · OH, chloride, residual chlorine, total chlorine and total organic carbon (TOC) Effect of removal rate. The results showed that the removal rate of SD reached 100% after 10 min of reaction and the TOC of the solution decreased obviously after 4 h of reaction. The removal rates of TOC in the reaction system of pH = 3, 4, 8, 8.5, 10 and 12 after 4 h reaction were 29%, 46%, 55%, 61%, 52% and 47% respectively. The peak appeared at pH = 8.5. Increasing the current density, electrolyte NaCl concentration and decreasing the initial SD concentration increased the TOC removal rate. The optimum conditions of the experiment were pH = 8.5, NaCl addition 0.025 mol / L, current density 20 mA / cm2 and initial concentration 100 mg / L SD. After 4 h of electrochemical oxidation, the removal rate of TOC reached 66% .