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有机配体对纳米零价铁还原硝基苯的影响与机理 被引量：2

Influence of various organic ligands on reduction of nitrobenzene by nanoscale zero-valent iron and its mechanism
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摘要 通过FeSO4·7H2O与NaBH4反应,采用液相还原法制备纳米级零价铁(NZVI),并用XRD,SEM对其性能进行表征。研究了纳米零价铁还原硝基苯(NB)的动力学规律及柠檬酸、草酸、柠檬酸钠、草酸钠、乙二胺四乙酸二钠(EDTA二钠盐)几种有机小分子对其还原效率的影响,并对其机理进行了初步探讨。结果表明,纳米零价铁去除硝基苯反应符合准一级动力学方程,并且当硝基苯浓度一定时,增加NZVI投加量,去除率会显著增大;当NZVI浓度一定时,硝基苯浓度越低,去除率越高;柠檬酸和EDTA二钠盐在较低浓度时抑制还原反应进行,而在3 mmol/L左右时,具有促进还原反应进行的作用,而草酸、柠檬酸钠和草酸钠则为抑制作用。 Zero-valent iron nanoparticles （NZVI） was synthesized by the reduction of FeSO4 7H20 and NaBH4 in liquid phase, and characterized by XRD, SEM. The removal kinetics and the influence on the removal rate of various organic ligands, including citric acid, oxalic acid, sodium oxalate, sodium citrate and EDTA- 2Na, were investigated in depth, and their influencing mechanisms were preliminarily discussed. The results in- dicated that the kinetic experimental data fitted the pseudo-first-order reaction. The removal rate of NB can be improved by an increase in NZVI concentration when the concentration of NB is constant. The lower the concen- tration of NB, the higher the removal rate of the NB when the concentration of NZVI is constant. The citric acid and EDTA-2Na retarded the removal of NB in low concentration while they accelerated the removal in 3 mmol/L concentration. Sodium citrate, oxalic acid, sodium oxalate retarded the removal rate of nitrobenzene.
作者 罗京 何广平 吴宏海
机构地区 华南师范大学化学与环境学院
出处 《环境工程学报》 CAS CSCD 北大核心 2012年第8期2527-2532,共6页 Chinese Journal of Environmental Engineering
基金 国家自然科学基金资助项目(40773080 41072034) 广东省自然科学基金项目(10151063101000028)
关键词 纳米零价铁 硝基苯 有机配体 zero-valent iron nanoparticles nitrobenzene organic ligand
分类号 X703 [环境科学与工程—环境工程]
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参考文献22

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共引文献22

同被引文献15

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环境工程学报
2012年 第8期

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