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Nitrogen-doped mesoporous carbon material (NCMK-3) as a catalyst for the removal of 4-chlorophenol during persulfate oxidation and its efficiency after reuse
Environmental Technology ( IF 2.8 ) Pub Date : 2020-06-26 , DOI: 10.1080/09593330.2020.1782994
Francis Addison 1 , Nnanake-Abasi Offiong 1 , Qilin Han 1 , Ruofan Wang 1 , Na Liu 1
Affiliation  

ABSTRACT

Persulfate (PS) oxidation of 4-chlorophenol (4CP) is mostly catalysed by relatively expensive metal substrates. In this study, we investigated the influence of nitrogen-doped and non-doped mesoporous carbon materials (NCMK-3 and CMK-3) during persulfate (PS) oxidation of 4CP in water. Batch experiments were conducted such that PS was added to simulated contaminant mixture after 1 h agitation with NCMK-3 and CMK-3. Further, the experiment was carried out at different temperatures, pH ranges, concentrations of persulfate (PS), and different doses of NCMK-3, since it recorded better removal rates compared to CMK-3. The results revealed that NCMK-3 and CMK-3 aided the removal of 4CP from water during persulfate oxidation. When persulfate was added after an hour of equilibration with CMK-3 and NCMK-3, 83% and 92% of 4CP were removed within 20 min, respectively, whereas lower removal rates (≤40) were recorded in the absence of persulfate (PS). The removal rates of 4CP increased with an increase in temperature but reduced in the alkaline medium in the NCMK-3/PS system. The efficiency of the NCMK-3 reduced significantly after it was reused three times. Based on the results, NCMK-3 influences the activity of PS oxidation of 4-chlorophenol (4CP) and exhibited a synergistic effect in the removal of the organic contaminant from water.



中文翻译:

氮掺杂介孔碳材料(NCMK-3)作为催化剂在过硫酸盐氧化过程中去除4-氯苯酚及其再利用后的效率

摘要

4-氯苯酚 (4CP) 的过硫酸盐 (PS) 氧化主要由相对昂贵的金属底物催化。在这项研究中,我们研究了氮掺杂和非掺杂介孔碳材料(NCMK-3 和 CMK-3)在 4CP 在水中的过硫酸盐 (PS) 氧化过程中的影响。进行批量实验,使 PS 在与 NCMK-3 和 CMK-3 一起搅​​拌 1 小时后添加到模拟污染物混合物中。此外,该实验是在不同的温度、pH 范围、过硫酸盐 (PS) 浓度和不同剂量的 NCMK-3 下进行的,因为与 CMK-3 相比,它记录了更好的去除率。结果表明,在过硫酸盐氧化过程中,NCMK-3 和 CMK-3 有助于从水中去除 4CP。当用 CMK-3 和 NCMK-3 平衡一小时后加入过硫酸盐时,83% 和 92% 的 4CP 在 20 分钟内被去除,分别,而在没有过硫酸盐(PS)的情况下记录了较低的去除率(≤40)。在 NCMK-3/PS 体系中,4CP 的去除率随着温度的升高而增加,但在碱性介质中降低。NCMK-3重复使用3次后效率明显下降。根据结果​​,NCMK-3 影响 PS 氧化 4-氯苯酚 (4CP) 的活性,并在去除水中的有机污染物方面表现出协同作用。

更新日期:2020-06-26
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