Significant Mobility of Novel Heteroaggregates of Montmorillonite Microparticles with Nanoscale Zerovalent Irons in Saturated Porous Media

• DOI: 10.3390/toxics10060332
• Publication Date: 2022-06-20T01:19:26Z
• Authors: Chongyang Shen; Jinan Teng; Wenjuan Zheng; Dong Liu; Ke Ma
• Keywords: Deposition; DLVO theory

This study conducted laboratory column experiments to systematically examine the transport of novel heteroaggregates montmorillonite (Mt) microparticles with nanoscale zerovalent irons (nZVIs) in saturated sand at solution ionic strengths (ISs) ranging from 0.001 0.2 M. Spherical nZVIs were synthesized using liquid phase reduction method and attached on plate-shaped Mt surfaces monolayer. While complete deposition occurred for sand, significant was observed Mt-nZVI IS ≤ 0.01 M despite decrease an increasing loading concentration Mt. The increased mobility because attractions between collectors reduced by electrostatic repulsions collector surfaces, which led a decreased columns. Complete ≥ 0.1 due favorable Derjaguin-Landau-Verwey-Overbeek (DLVO) primary energy minima. Interestingly, large fraction deposited released reducing monotonic interaction separation distance low ISs (resulting repulsive forces), contrast irreversible nZVIs. Therefore, fabricated could also have high subsurfaces saline pore water through continuous capture release multiple injections ISs. Our first plate-like particle spherical nanoparticles porous media; results important implications use iron situ soil groundwater remediation.