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Effects of humic acid and electrolytes on photocatalytic reactivity and transport of carbon nanoparticle aggregates in water

Author:
Chae, So-Ryong, Xiao, Yao, Lin, Shihong, Noeiaghaei, Tahereh, Kim, Jong-Oh, Wiesner, Mark R.
Source:
Water research 2012 v.46 no.13 pp. 4053-4062
ISSN:
0043-1354
Subject:
carbon, carbon nanotubes, electrolytes, fullerene, humic acids, hydrophobicity, nanoparticles, porous media, reactive oxygen species, salts, silica, solutes
Abstract:
The effects of naturally occurring macromolecules such as humic acid (HA) and electrolytes on four fullerene nanoparticle suspensions (i.e., C₆₀, C₆₀(OH)₂₄, single- and multiwall carbon nanotubes) were explored with respect to: (1) characteristics of nanoparticle aggregates, (2) transport of the aggregates through a silica porous media, and (3) production of reactive oxygen species (ROS) from the photosensitized fullerene aggregates. The presence of HA and salts increased the size of aggregates and relative hydrophobicity associated with transport through silica beads, while decreasing ROS production. These data illustrate the importance that transformation of engineered nanomaterials (ENMs) through interactions with aquatic solutes may have in altering the environmental behavior of nanomaterials.
Agid:
882796