水体中硝酸盐对纳米铁降解五氯酚的影响  

Effect of nitrate on degradation of pentachlorophenol in water with iron nanoparticles

作　　者：程荣[1] 戚道铎[2] 董伟娜[2] 王建龙[1] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]北京工业大学环境与能源工程学院,北京100124

出　　处：《清华大学学报（自然科学版）》2010年第6期877-880,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50325824)

摘　　要：五氯酚是一种需要优先控制的高毒性污染物。该文以自制的纳米铁为原料,考察了硝酸盐对纳米铁降解五氯酚的影响。采用化学还原法制备了纳米铁,测定了不同浓度硝酸盐存在时五氯酚及氯离子的浓度变化情况,分析了五氯酚的降解产物及纳米铁的转化产物。结果表明:当五氯酚初始浓度为0.1 mmol/L时,硝酸盐浓度低于1 mmol/L时无明显影响;硝酸盐浓度达到2 mmol/L时,五氯酚的降解受到明显抑制;硝酸盐浓度≥3 mmol/L时,五氯酚的降解几乎被停止。硝酸盐影响五氯酚的脱氯过程,硝酸盐存在时五氯酚更易产生氧化产物。但有无硝酸盐存在时,纳米铁均转化为Fe2O3/Fe3O4和FeOOH。Pentachlorophenol（PCP） is a highly toxic pollutant.The effect of nitrate on the degradation of PCP by iron nanoparticles synthesized was investigated using the chemical reductive method.The concentrations of PCP and chloride in solutions with different concentrations of nitrate were measured during the treatment process.The intermediate and final products from the PCP and iron nanoparticles were also analyzed.The results show that when the initial concentration of PCP is 0.1 mmol·L-1,NO-3 at ≤ 1 mmol·L^-1 does not affect the degradation of PCP.NO-3 at 2 mmol·L^-1 slows the PCP dechlorination and NO-3 at ≥ 3 mmol·L^-1 stops the PCP dechlorination.The oxidized intermediates were more likely with NO3^-.The iron nanoparticles are transformed to Fe2O3/Fe3O4and FeOOH with and not with NO3^-.

关 键 词：纳米铁 五氯酚 硝酸盐 脱氯 降解 

分 类 号：X703.1[环境科学与工程—环境工程]