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Water Res. 2017 Nov 1;124:595-604. doi: 10.1016/j.watres.2017.08.001. Epub 2017 Aug 3.

Relative importance of humic and fulvic acid on ROS generation, dissolution, and toxicity of sulfide nanoparticles.

Author information

1
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, People's Republic of China.
2
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, People's Republic of China. Electronic address: liyang_bnu@bnu.edu.cn.
3
School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, People's Republic of China.
4
School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Abstract

In this study, the effect of natural organic matter (NOM) composition (humic acid (HA) or fulvic acid (FA)) on dissolution, reactive oxygen species (ROS) generation, and toxicity of sulfide nanoparticles (NPs) was investigated under UV irradiation. NOM acted as a UV filter or antioxidant, decreasing ROS (O2-, OH, and 1O2) generation by WS2 and MoS2 NPs. The higher light-absorbing fractions of HA in NP/HA mixtures and the faster reaction rate of HA with ROS resulted in higher inhibition effect of HA than FA on O2- and OH generation by WS2 and MoS2 NPs. Both HA and FA completely inhibited 1O2 generation by WS2 and MoS2 NPs. NOM could transfer electrons to CdS and promote its O2- generation. No measurable amount of OH was generated by CdS with or without NOM. FA decreased 1O2 generation by CdS more significantly than HA due to the higher reaction rate between FA and 1O2. HA showed a higher inhibition effect on the dissolution rate of CdS and WS2 NPs than FA. Both HA and FA played minor roles in the toxicity of CdS toward Escherichia coli but decreased the toxicity of MoS2 and WS2 due to the reduced ROS generation and/or dissolution concentrations.

KEYWORDS:

Dissolution; Dissolved organic matter; Escherichia coli; Phototoxicity; Reactive oxygen species; Sulfide nanoparticles

PMID:
28820990
DOI:
10.1016/j.watres.2017.08.001
[Indexed for MEDLINE]

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