This study demonstrated the prolonged benefits of polyvinyl-coated calcium peroxide ([email protected]) in Fe(II)/nFeS mediated Fenton-like reaction. [email protected] was prepared by a coating of PVA on calcium peroxide (CP) and synthesized nano-sized iron sulfide (nFeS) was characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) with energy dispersive spectroscopy (EDS) elemental mapping, X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectroscopy (ICP-OES) and Fourier transmission infrared (FTIR) techniques. Trichloroethylene (TCE) degradation in various oxic environments (H₂O₂, CP, or [email protected]) was investigated using Fe(II)/nFeS, and the slowest rate constant of 0.031 M⁻¹ min⁻¹ with 91 % TCE removal highlighted the long-lasting effects of [email protected] The effect of initial solution pH revealed that the acidic condition was most favorable. [email protected] system accumulated the least amount (6.34 mg/L) of Fe(III) than H₂O₂ and CP systems. Electron paramagnetic resonance (EPR) and scavenging tests highlighted that free hydroxyl radicals (HO_free) contributed dominantly in H₂O₂ system while both free and surface-bound species participated well in CP and [email protected] systems. Moreover, the insight mechanism of regenerated Fe(II) on the nFeS surface was explored by XPS. Both oxidation and reduction of sulfur were discussed and declared that S(-II) was responsible for regenerating Fe(II). The recycling sample checked the reusability of nFeS, and 98.8 % TCE removal in actual groundwater emphasized that [email protected]/Fe(II)/nFeS is a viable technique. In conclusion, the [email protected]/Fe(II)/nFeS system is highly recommended for long-lasting remediation of TCE contaminated groundwater.

这项研究表明，在Fe（II）/ nFeS介导的Fenton样反应中，聚乙烯基包覆的过氧化钙（[受电子邮件保护]）具有长期的优势。通过在过氧化钙（CP）上涂覆PVA来制备[受电子邮件保护]，并通过扫描电子显微镜（SEM），高分辨透射电子显微镜（HR-TEM）表征了合成的纳米级硫化铁（nFeS）的特征。色散光谱（EDS）元素映射，X射线衍射法（XRD），X射线光电子能谱（XPS），电感耦合等离子体发射光谱（ICP-OES）和傅立叶透射红外（FTIR）技术。三氯乙烯（TCE）在各种有氧环境（H ₂ O ₂，CP或[受电子邮件保护]）使用Fe（II）/ nFeS进行了研究，最慢的速率常数为0.031 M ^-1  min ^-1，TCE去除率为91％，突出了[受电子邮件保护]的持久作用。初始溶液的pH值表明酸性条件是最有利的。[受电子邮件保护的]系统比H ₂ O ₂和CP系统积累的Fe（III）最少（6.34 mg / L）。电子顺磁共振（EPR）和清除测试表明，游离羟基（HO _free）在H ₂ O _{2中起主要作用}自由和表面结合物种都很好地参与了CP和[电子邮件保护]系统。此外，通过XPS探索了nFeS表面再生Fe（II）的机理。讨论了硫的氧化和还原，并宣称S（-II）负责再生Fe（II）。回收样品检查了nFeS的可重复使用性，在实际地下水中去除了88.8％的三氯乙烯（TCE）强调了[电子邮件保护] / Fe（II）/ nFeS是可行的技术。总之，强烈建议使用[电子邮件保护] / Fe（II）/ nFeS系统对TCE污染的地下水进行长期修复。