Chemical removal and selectivity reduction of nitrate from water by (nano) zero-valent iron/activated carbon micro-electrolysis.,Chemosphere

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Chemical removal and selectivity reduction of nitrate from water by (nano) zero-valent iron/activated carbon micro-electrolysis.
Chemosphere ( IF 8.1 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.chemosphere.2020.125986
Ningfan Song ₁ , Jian Xu ₁ , Yunpeng Cao ₂ , Fan Xia ₁ , Jun Zhai ₁ , Hainan Ai ₁ , Dezhi Shi ₁ , Li Gu ₁ , Qiang He ₁

Affiliation

The processes of (n)ZVI/AC（（nano）zero valent iron/activated carbon）micro-electrolysis were applied for nitrate removal from groundwater, aiming to reduce nitrate to N2, an environmentally friendly end product. (n)ZVI was utilized and combined with selected commercial AC to form the micro-electrolysis. Effect of different operational parameters, including reductant dosage, (n)ZVI/AC ratios, and reaction pH, on nitrate and TN removal were cleared. The results showed that nZVI presents higher reaction activities than ZVI in micro-electrolysis. With the increase of the (n)ZVI/AC mass ration from 1:2 to 2:1, the TN removal increased from 16.8% to 38.9%, then declined with the further increase of the ratio. The nitrate removal was negatively correlated with the initial pH of the solution. Compared to ZVI particles, even with a lower dosage, nZVI presented 100% nitrate removal at acidic and neutral pH conditions, and TN removal could maintain higher than 35% with pH lower than 9.0. A kinetic model was also established to explain the pathways of nitrate removal, and the results indicated that AC not only enriched nitrate as an adsorbent but also present highly potential in catalytic converting nitrate to N2. The technique presented great potentials in removing nitrate from water and a promising application prospect.

中文翻译：

通过（纳米）零价铁/活性炭微电解从水中化学去除硝酸盐和选择性还原硝酸盐。

采用（n）ZVI / AC（（纳米）零价铁/活性炭）微电解工艺去除地下水中的硝酸盐，以将硝酸盐还原为环境友好的最终产品N2。利用（n）ZVI并将其与选定的商用AC结合以形成微电解。清除了包括还原剂用量，（n）ZVI / AC比和反应pH在内的不同操作参数对硝酸盐和TN去除的影响。结果表明，在微电解中，nZVI的反应活性高于ZVI。随着（n）ZVI / AC质量比从1：2增加到2：1，TN去除率从16.8％增加到38.9％，然后随着比率的进一步增加而下降。硝酸盐的去除与溶液的初始pH呈负相关。与ZVI颗粒相比，即使剂量较低，在酸性和中性pH条件下，nZVI的硝酸盐去除率达到100％，而在pH值低于9.0的情况下，TN去除率可以保持高于35％。还建立了动力学模型来解释硝酸盐去除的途径，结果表明AC不仅富集硝酸盐作为吸附剂，而且在催化将硝酸盐转化为N2方面具有很高的潜力。该技术具有去除水中硝酸盐的巨大潜力和广阔的应用前景。

更新日期：2020-01-22

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