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首页> 外文期刊>Water Science and Technology >Reduction of concentrated nitrate by using in situ synthesized zero-valent copper
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Reduction of concentrated nitrate by using in situ synthesized zero-valent copper

机译：通过原位合成零价铜还原浓硝酸盐

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摘要

Although zero-valent iron represents a promising approach for reduction of nitrate (NO3-) in water, its application in concentrated nitrate is limited by surface passivation. In this study, an alternative approach using in situ synthesized zero-valent copper (Cu-0) produced by borohydride (NaBH4) was investigated. Complete reduction was observed within 55 min by reacting 677 mg-N/L of NO3- with CuO (0.312 g/L) and NaBH4 (4.16 g/L) at 60 degrees C. The pseudo-first-order rate constant was 0.059 min(-1), and it increased threefold when the CuO dose was increased to 1.24 g/L. Increasing the NaBH4 dose produced less nitrite (NO2-) throughout the experiments, indicating that it is the primary agent for reducing NO2-. The initial pH exerted a significant effect on the reaction rate, and NO3- was rapidly reduced when the initial pH was less than 4. Based on the research findings, possible reaction pathways for NO3- reduction by Cu-0 are proposed in this work.
机译：尽管零价铁是减少水中硝酸盐（NO3-）的一种有前途的方法，但其在浓硝酸盐中的应用受到表面钝化的限制。在这项研究中，研究了使用由硼氢化物（NaBH4）生产的原位合成零价铜（Cu-0）的另一种方法。在55分钟内通过使677 mg-N / L的NO3-与CuO（0.312 g / L）和NaBH4（4.16 g / L）反应在60摄氏度下观察到完全还原。拟一级反应速率常数为0.059 min （-1），当CuO剂量增加到1.24 g / L时，它增加了三倍。在整个实验过程中，增加NaBH4剂量会产生较少的亚硝酸盐（NO2-），表明它是还原NO2-的主要试剂。初始pH值对反应速率有显着影响，当初始pH值小于4时，NO3-迅速还原。基于研究结果，本工作提出了Cu-0还原NO3-的可能反应途径。

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