Zero-valent iron-nanoparticles (ZVI-NPs) entrapped in silica matrices through a sol-gel procedure are investigated as redox catalysts with BH₄⁻ (NaBH₄) as the reducing agent. The results indicated that the matrix functions as an efficient and multifunctional catalyst for the reduction of halo-acetic acids (HAAs), [BrO₃⁻] and 4-nitrophenol pollutants present in the contaminated water. The present study revealed that the reduction mechanism depends on the nature of the substrate, M⁰ used and the rate of the reductant addition (batch mode reactor system). The novelty of the present work is double-fold: First, in pointing out that the mechanism of the catalytic de-halogenation reaction depends on the nature of M⁰-NPs used as a catalyst, probably due to the different over-potential for the HER reaction on each M⁰-NPs and second, the development of a cost-effective remediation alternative compared to the analogous Au⁰-NPs or Ag⁰-NPs catalysts reported in the literature.

通过溶胶-凝胶过程中截留的二氧化硅基质零价铁纳米颗粒（ZVI-NPS）进行了研究，与BH氧化还原催化剂₄ ^- （加入NaBH ₄）作为还原剂。结果表明，基质的功能的有效和多功能催化剂为卤代乙酸（杂环胺）的减少，[的BrO ₃ ^- ]和4-硝基苯酚污染物存在于污染的水。本研究表明还原机理取决于底物的性质，使用的M ⁰和还原剂的添加速率（分批模式反应器系统）。本研究的新颖性是双重的：首先，指出催化脱卤反应的机理取决于M的性质。⁰作为催化剂使用，这可能是由于用于HER上每个M反应的不同过电位-nps ⁰ -nps和第二，具有成本效益的替代补救的发展相比，类似的Au ⁰ -nps或Ag ⁰ - NPs催化剂已在文献中报道。