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首页> 外文期刊>Separation and Purification Technology >Activation of sulfite by different Fe-0-based nanomaterials for oxidative removal of sulfamethazine in aqueous solution
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Activation of sulfite by different Fe-0-based nanomaterials for oxidative removal of sulfamethazine in aqueous solution

机译：不同Fe-0基纳米材料活化亚硫酸盐，用于氧化水溶液中磺胺甲嘧啶的氧化去除

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In this work, bare nanoscale zero-valent iron (NZVI) and the modified NZVI (sulfide-modified NZVI, Ni/NZVI and activated carbon supported NZVI) were utilized to activate sulfite for the removal of the target pollutant sulfamethazine (SMT). Some critical factors influencing the removal process were investigated, including dosage of sulfite and nanoparticles (NPs), ratios of modifier/NZVI, dissolved oxygen, initial pH values, groundwater components and aging time of NPs. Under the optimal conditions, in terms of the dosage of sulfite/NPs and the ratio of modifier/NZVI, all the modified NZVI showed a better performance than the bare NZVI. Dissolved oxygen was determined to be an essential factor for producing reactive radicals in all the activation processes. The active radicals were identified to be SO4 center dot and HO center dot and HO center dot was evidenced as the principal reactive species. Initial pH value significantly affected the SMT removal, which was obviously inhibited under alkaline condition. In such case, Ni/NZVI showed a better performance than the other NPs due to the catalysis effect of Ni. It was also found that the groundwater components (e.g., HCO3-, Ca2+, SO42-, and humic acid) could restrain the removal process because of the buffering effect, the radical scavenging effect and some other effects (e.g., surface precipitation). Spectroscopic analysis of the fresh and aged (30 d) NPs illustrated that both bare and modified NZVI were slightly oxidized in the air, and could still be employed for the activation of sulfite.
机译：在这项工作中，利用裸纳米级零价铁（NZVI）和改性的NZVI（硫化物改性的NZVI，Ni / NZVI和活性炭支持的NZVI），用于活化亚硫酸盐以除去靶污染物磺胺甲嘧啶（SMT）。研究了影响去除过程的一些关键因素，包括亚硫酸盐和纳米颗粒（NPS）的剂​​量，改性剂/ NZVI的比例，溶解氧，初始pH值，地下水组分和NPS的老化时间。在最佳条件下，就亚硫酸盐/ NPS的剂量和改性剂/ NZVI的比例而言，所有修饰的NZVI都显示出比裸NZVI更好的性能。将溶解的氧被确定为在所有活化过程中产生活性自由基的必要因素。鉴定活性基团是SO4中心点，HO中心点和HO中心点被证明是主要的反应性物种。初始pH值显着影响SMT去除，显然在碱性条件下抑制。在这种情况下，由于Ni的催化作用，Ni / NZVI显示出比其他NP更好的性能。还发现地下水组分（例如，HCO3-，CA2 +，SO42-和腐殖酸）可以抑制由于缓冲效应，自由基清除效果和一些其他影响（例如，表面沉淀）而抑制去除过程。所示的新鲜和老化（30d）NPS的光谱分析表明，裸露和改性的NZVI在空气中略微氧化，并且仍可用于激活亚硫酸盐。

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