Facet-mediated interaction between humic acid and TiO2 nanoparticles: implications for aggregation and stability kinetics in aquatic environments

2019 ◽  
Vol 6 (6) ◽  
pp. 1754-1764 ◽  
Author(s):  
Hui Zhang ◽  
Weimin Wang ◽  
Huanxin Zhao ◽  
Lixia Zhao ◽  
Li-Yong Gan ◽  
...  
Keyword(s):  
Humic Acid ◽  
Tio2 Nanoparticles ◽  
Aquatic Environments ◽  
Dependent Manner ◽  
Stability Kinetics

Humic acid improves TiO2 nanocrystal stability in a facet dependent manner due to the facet-specific SRHA coordination on the TiO2 surface.

scholarly journals Sensitive Monitoring of Humic Acid in Various Aquatic Environments with Acidic Cerium Chemiluminescence Detection

2007 ◽  
Vol 23 (10) ◽  
pp. 1189-1193 ◽  
Author(s):  
Xianglei CHENG ◽  
Lixia ZHAO ◽  
Xu WANG ◽  
Jin-Ming LIN
Keyword(s):  
Humic Acid ◽  
Aquatic Environments ◽  
Chemiluminescence Detection

Optimisation of an extraction/leaching procedure for the characterisation and quantification of titanium dioxide (TiO2) nanoparticles in aquatic environments using SdFFF-ICP-MS and SEM-EDX analyses

2017 ◽  
Vol 9 (24) ◽  
pp. 3626-3635 ◽  
Author(s):  
Florian Dutschke ◽  
Johanna Irrgeher ◽  
Daniel Pröfrock
Keyword(s):  
Titanium Dioxide ◽  
Tio2 Nanoparticles ◽  
Environmental Samples ◽  
Extraction Method ◽  
Nano Particles ◽  
Aquatic Environments ◽  
Ms Analysis ◽  
Icp Ms ◽  
Edx Analyses ◽  
Leaching Procedure

A novel, optimized and validated extraction method for engineered TiO2 nano-particles from environmental samples prior to SdFFF-MALS-ICP-MS/MS analysis is presented.

scholarly journals PHOTO-REDUCTION KINETICS OF MnO2 IN AQUATIC ENVIRONMENTS CONTAINING HUMIC ACIDS

2010 ◽  
Vol 8 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Narsito Narsito ◽  
Sri Juari Santosa ◽  
Setya Lastuti
Keyword(s):  
Humic Acid ◽  
Aqueous Medium ◽  
Humic Acids ◽  
Radical Scavenger ◽  
Aquatic Environments ◽  
Oh Radicals ◽  
Anion Complex ◽  
Reduction Efficiency ◽  
Internal Electron ◽  
Kinetics Of

The kinetics of photo-reduction of manganese(IV) oxide, MnO2 in aqueous medium, in the presence of humic acid has been investigated, including the possibility for the involvement of such radicals in the reduction. Results showed that in aqueous medium, the efficiency of the photo-reduction of MnO2 producing a soluble ionic Mn(II) was governed strongly by an internal electron transfer within an intermediate of HA-MnO2 anion complex, resulted in the chemical adsorption of humic acid on MnO2 surface. It was observed that under solar radiation and atmosphere containing oxygen, the rate of MnO2 reduction increased considerably, by factors of about 46 and 2 respectively. Moreover, there was evidence that some radicals certainly played a role in the photo-reduction of MnO2, since radical scavenger addition significantly decreased the reduction efficiency of MnO2. In the present of an excess of propanol-2, however, which was expected to remove all OH radicals present, only about 60 % decrease in reduction efficiency were observed, suggesting that radicals other than OH radical are involved in the reduction of MnO2. It was observed further that the presence of iron(III) in MnO2 up to 1 % (w/w) did not alter the reduction efficiency of MnO2.   Keywords: MnO2 kinetics, photo-reduction, aquatic, humic acids

Deposition Kinetics of Colloidal Manganese Dioxide onto Representative Surfaces in Aquatic Environments: The Role of Humic Acid and Biomacromolecules

2018 ◽  
Vol 53 (1) ◽  
pp. 146-156 ◽  
Author(s):  
Xiaoliu Huangfu ◽  
Chengxue Ma ◽  
Ruixing Huang ◽  
Qiang He ◽  
Caihong Liu ◽  
...  
Keyword(s):  
Humic Acid ◽  
Manganese Dioxide ◽  
Aquatic Environments ◽  
Deposition Kinetics ◽  
Kinetics Of

BINDING OF DIQUAT AND PARAQUAT TO HUMIC ACID IN AQUATIC ENVIRONMENTS

Soil Science ◽  
1982 ◽  
Vol 133 (6) ◽  
pp. 356-363 ◽  
Author(s):  
DEORAJ R. NARINE ◽  
ROBERT D. GUY
Keyword(s):  
Humic Acid ◽  
Aquatic Environments

Effects of humic acid and ionic strength on TiO2 nanoparticles sublethal toxicity to zebrafish

Ecotoxicology ◽  
2015 ◽  
Vol 24 (10) ◽  
pp. 2054-2066 ◽  
Author(s):  
T. Fang ◽  
L. P. Yu ◽  
W. C. Zhang ◽  
S. P. Bao
Keyword(s):  
Humic Acid ◽  
Ionic Strength ◽  
Tio2 Nanoparticles ◽  
Sublethal Toxicity

scholarly journals Finding Nano: Challenges Involved in Monitoring the Presence and Fate of Engineered Titanium Dioxide Nanoparticles in Aquatic Environments

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 734
Author(s):  
Simone Heilgeist ◽  
Ryo Sekine ◽  
Oz Sahin ◽  
Rodney A. Stewart
Keyword(s):  
Titanium Dioxide ◽  
Tio2 Nanoparticles ◽  
Inductively Coupled Plasma ◽  
Titanium Dioxide Nanoparticles ◽  
Aqueous Media ◽  
Experimental Studies ◽  
Aquatic Environments ◽  
Nano Tio2 ◽  
Icp Ms ◽  
Modelling Studies

In recent years, titanium dioxide (TiO2) has increasingly been used as an inorganic ultraviolet (UV) filter for sun protection. However, nano-TiO2 may also pose risks to the health of humans and the environment. Thus, to adequately assess its potential adverse effects, a comprehensive understanding of the behaviour and fate of TiO2 in different environments is crucial. Advances in analytical and modelling methods continue to improve researchers’ ability to quantify and determine the state of nano-TiO2 in various environments. However, due to the complexity of environmental and nanoparticle factors and their interplay, this remains a challenging and poorly resolved feat. This paper aims to provide a focused summary of key particle and environmental characteristics that influence the behaviour and fate of sunscreen-derived TiO2 in swimming pool water and natural aquatic environments and to review the current state-of-the-art of single particle inductively coupled plasma mass spectrometry (SP-ICP-MS) approaches to detect and characterise TiO2 nanoparticles in aqueous media. Furthermore, it critically analyses the capability of existing fate and transport models to predict environmental TiO2 levels. Four particle and environmental key factors that govern the fate and behaviour of TiO2 in aqueous environments are identified. A comparison of SP-ICP-MS studies reveals that it remains challenging to detect and characterise engineered TiO2 nanoparticles in various matrices and highlights the need for the development of new SP-ICP-MS pre-treatment and analysis approaches. This review shows that modelling studies are an essential addition to experimental studies, but they still lack in spatial and temporal resolution and mostly exclude surface transformation processes. Finally, this study identifies the use of Bayesian Network-based models as an underexplored but promising modelling tool to overcome data uncertainties and incorporates interconnected variables.

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