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首页> 外文期刊>Separation and Purification Technology >Effect of pH on DDT degradation in aqueous solution using bimetallic Ni/Fe nanoparticles
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Effect of pH on DDT degradation in aqueous solution using bimetallic Ni/Fe nanoparticles

机译：pH对双金属Ni / Fe纳米颗粒在水溶液中DDT降解的影响

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摘要

In this study,bimetallic Ni/Fe nanoparticles were prepared and the ability of this material to degrade DDT in aqueous solution was investigated at room temperature.Besides comparing the degradation rates of DDT using monometallic zero-valent iron and bimetallic Ni/Fe,batch investigations with bimetallic Ni/Fe nanoparticles were conducted to explore the influence of pH value on the degradation rate of DDT in aqueous solution.Results indicate that weakly acidic(4 <= pH < 7)or alkaline reaction(7 < pH <= 10)conditions afford faster degradation rates,whereas higher or lower pH inhibits the DDT degradation.In addition,the DDT degradation exhibits an interesting pathway and mechanism at higher pH value(pH > 10)in reaction solution.In strong alkaline solution,the DDT degradation becomes slow but is not quenched.The electron transfer for DDT degradation is enhanced by creating numerous galvanic cells under the Ni catalysis,and promotes the dehydrochlorination reaction.The hydrodechlorinatipn reaction in alkaline condition is also unbroken.This phenomenon is quite different from those reported in other studies previously.
机译：本研究制备了双金属Ni / Fe纳米粒子，并研究了该材料在室温下降解DDT的能力。此外，还比较了使用单金属零价铁和双金属Ni / Fe降解DDT的速率，进行了批量研究。用Ni / Fe双金属纳米粒子研究了pH值对水溶液中滴滴涕降解速率的影响。结果表明弱酸性（4 <= pH <7）或碱性反应（7 H <= 10）条件具有较高的降解速率，而较高或较低的pH值都会抑制DDT降解。此外，在较高pH值（pH> 10）的条件下，DDT降解表现出有趣的途径和机理。在Ni催化下，通过产生大量原电池，提高了DDT降解的电子传递，并促进了脱氯化氢反应。在碱性条件下的反应也没有破坏。这种现象与以前其他研究中报道的现象完全不同。

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