Activation of persulfate and hydrogen peroxide by using sulfide-modified nanoscale zero-valent iron for oxidative degradation of sulfamethazine: A comparative study
Activation of persulfate and hydrogen peroxide by using sulfide-modified nanoscale zero-valent iron for oxidative degradation of sulfamethazine: A comparative study
复制标题
硫化物改性纳米零价铁活化过硫酸盐和过氧化氢氧化降解磺胺二甲嘧啶的比较研究
DOI：
10.1016/j.seppur.2019.02.052
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发表时间：
2019-07-01
影响因子：
8.6
通讯作者：
Xie, Qianqian
中科院分区：
文献类型：
--
作者：
Dong, Haoran;Wang, Bin;Xie, Qianqian
在本研究中，采用硫化物修饰的纳米级零价铁（S-nZVI）活化过硫酸盐（PS）和过氧化氢（H2O2）去除磺胺甲基嗪（SMT）。考察了氧化剂浓度、SMT浓度、Fe/S摩尔比和初始pH等可能的影响因素。S-nZVI/PS体系对SMT的去除率随PS浓度的增加而增加，而S-nZVI/H2O2体系存在最佳H2O2浓度。在相同的拟合条件下，S-nZVI/H2O2体系的氧化能力明显强于S-nZVI/PS体系。此外，S- nzvi /PS体系更容易受到S- nzvi中Fe/S摩尔比的影响，当Fe/S >= 40时，SMT去除率较高。然而，S-nZVI/PS体系在3-9的广泛pH范围内是有效的，而S-nZVI/H2O2体系的有效pH仅限于3。此外，在模拟地下水中进一步考察了S-nZVI/PS体系对SMT的去除效果，发现在pH值5 ~ 8范围内，地下水组分对SMT去除效果的影响不显著，但在pH值9范围内出现了显著的负作用。
In this study, sulfide-modified nanoscale zero-valent iron (S-nZVI) was employed to activate persulfate (PS) and hydrogen peroxide (H2O2) for the removal of sulfamethazine (SMT). The potential influencing factors, such as oxidant concentration, SMT concentration, Fe/S molar ratio and initial pH, were examined. The removal of SMT in the S-nZVI/PS system increased with the increasing PS concentration, while there was an optimum H2O2 concentration in the S-nZVI/H2O2 system. The S-nZVI/H2O2 system showed much stronger oxidative capacity than the S-nZVI/PS system under the same fitting condition. Moreover, the S-nZVI/PS system was more susceptible to the molar ratio of Fe/S in S-nZVI, and a higher SMT removal was achieved under conditions of Fe/S >= 40. Nevertheless, the S-nZVI/PS system was efficient over a wide pH range of 3-9, while the efficient pH in the S-nZVI/H2O2 system was confined to just 3. In addition, the SMT removal by the S-nZVI/PS system was further examined in simulated groundwater and it was found that the influence of groundwater components on the removal of SMT was insignificant over the pH range of 5-8, but a notable negative effect was observed at pH 9.