Journal ArticleDOI
Interactions of humic acid with nanosized inorganic oxides.
Kun Yang,Daohui Lin,Baoshan Xing +2 more
TLDR
HA adsorption showed that HA-coated nano-oxides could be more easily dispersed and suspended and more stable in solution than uncoated ones because of their enhanced electrostatic repulsion.Abstract:
Adsorption of natural organic matter (NOM) on nanoparticles (NPs) is important for evaluating their transport, transfer, and fate in the environment, which will also affect sorption of hydrophobic organic compounds (HOCs) by NPs and thereby potentially alter the toxicity of NPs and the fate, transport, and bioavailability of HOCs in the environment. Therefore, the adsorption behavior of humic acids (HA) by four types of nano-oxides (i.e., TiO2, SiO2, Al2O3, and ZnO) was examined in this study to explore their interaction mechanisms using techniques including Fourier transform infrared (FTIR) spectroscopy and elemental, ζ potential, and surface area analyses. Adsorption of HA was observed on nanosized TiO2, Al2O3, and ZnO but not on nano-SiO2. Furthermore, HA adsorption was pH-dependent. HA adsorption by nano-oxides was mainly induced by electrostatic attraction and ligand exchange between HA and nano-oxide surfaces. Surface hydrophilicity and negative charges of nano-oxides affected their adsorption of HA...read more
Citations
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Aggregation and Dissolution of 4 nm ZnO Nanoparticles in Aqueous Environments: Influence of pH, Ionic Strength, Size, and Adsorption of Humic Acid
TL;DR: Measurements of nanoparticle aggregation due to attractive particle-particle interactions show that ionic strength, pH, and adsorption of humic acid affect the aggregation of ZnO nanoparticles in aqueous solutions, which are consistent with the trends expected from Derjaguin-Landau-Verwey-Overbeek (DLVO) theory.
Journal ArticleDOI
Titanium nanomaterial removal and release from wastewater treatment plants.
TL;DR: Titanium (Ti) occurs naturally in soils and as highly purified titanium dioxide (Ti5O2) in many commercial products that have been used for decades and is monitored in environment where WWTP liquid effluent is discharged or biomass disposed to increase knowledge on the fate and transport of other nanomaterials in the environment.
Journal ArticleDOI
Toxicity of ZnO Nanoparticles to Escherichia coli: Mechanism and the Influence of Medium Components
Mei Li,Lizhong Zhu,Daohui Lin +2 more
TL;DR: Water chemistry can be a major factor regulating the toxicity mechanism of ZnO nanoparticles (nano-ZnO) in water and the effect of water chemistry on the physicochemical properties of nanoparticles should be paid more attention in future nanotoxicity evaluations.
Journal ArticleDOI
Interactions of Dissolved Organic Matter with Natural and Engineered Inorganic Colloids: A Review
TL;DR: If traditional approaches based on the DLVO-theory can be useful in specific cases, quantitative aggregation models taking into account DOM dynamics, bridging, and disaggregation are needed for a comprehensive modeling of colloids stability in natural media.
Journal ArticleDOI
Fate and Risks of Nanomaterials in Aquatic and Terrestrial Environments
TL;DR: Comparisons of estimated exposure data with known toxicity data indicate that the predicted environmental concentrations are orders of magnitude below those known to have environmental effects on biota.
References
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Journal ArticleDOI
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Journal ArticleDOI
Coating Fe3O4 Magnetic Nanoparticles with Humic Acid for High Efficient Removal of Heavy Metals in Water
TL;DR: The Fe3O4/HA was able to remove over 99% of Hg(LL) and Pb(ll) and over 95% of Cu(II) and Cd( II) in natural and tap water at optimized pH.