Mechanism and influence factors of 2,4‐D dechlorination by sodium citrate‐activated bimetallic palladium‐zero valent iron nanoparticles

• DOI: 10.1002/aoc.5324
• Publication Date: 2019-12-07T01:54:25Z
• Authors: Hongyi Zhou; Yongkang Zhao; Junchao Xiang; Ning Huang; Shams Ali Baig; Sisi Zeng
• Keywords: Zerovalent iron; Bimetallic strip; Passivation; Reactivity; Reductive Dechlorination

Nanoscale zero‐valent iron (nZVI) has high removal efficiency and strong reductive ability to organic contaminants, but this reactivity soon ceases is attributed rapid passivation of the nZVI surface due formation oxides. In present study, bimetallic palladium‐zero valent nanoparticles were activated with sodium citrate (SC‐nPd/Fe) enhance 2,4‐D dechlorination from aqueous solutions. FTIR XRD analyses showed that there was no layer on after addition SC, XPS analysis confirmed reaction still maintained Pd ratio. The existence SC facilitated transfer electrons Fe 0 thus accelerating 2,4‐D. nPd/Fe only 56.4% in 210 min, while complete could be achieved SC‐nPd/Fe under same conditions, simultaneously 97.1% phenoxyacetic acid (PA) generated. Moreover, effect conditions such as ratio, dosage, initial pH temperature also investigated, it well described by pseudo‐first‐order kinetic model. particular, chelating abilities similar EDTA, an environmentally‐friendly agent. Findings study suggested a promising substitute for application remediation contained water.