Aggregation behavior of TiO2 nanoparticles in municipal effluent: Influence of ionic strengthen and organic compounds

Ren, Meijie; Horn, Harald; Frimmel, Fritz H.

doi:10.1016/j.watres.2017.07.021

Cited by 60 publications

(13 citation statements)

References 44 publications

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“…[ 80 ] When the particles are suspended in a natural environment, their actual diameter is greater than the declared nominal size. [ 81 ] While pH is the main parameter in body fluids, in a natural environment we consider ionic strength ( I S ), [ 82 ] natural organic matter (NOM), [ 83 ] temperature, freezing point, [ 84 ] and type of electrolyte, [ 85 ] all of which affect the surface charge and therefore the aggregation/stability of the NPs. In particular, increasing the I S reduces the thickness of the electrostatic double layer and the repulsive forces.…”

Section: Uncertaintymentioning

confidence: 99%

Experimental methods in chemical engineering: Zeta potential

et al. 2021

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Zeta potential (ZP) is a parameter that expresses the electrochemical equilibrium between particles and liquids like in nanoparticle (NP) colloidal solutions with applications in medicine, pharmaceuticals, chemical production, mineral processing, and water and soil purification. Smoluchowski's theory applies to the ZP particles that are larger the interfacial layer but neglects surface conductivity. The Debye-Hückel theory correctly approximates the concentration of ions in a double layer but fails to account for the dependence of ZP on the concentration of counterions. Determining ZP of NPs is essential to proper NP characterization. For instance, developing well-defined therapeutic-relevant nanoformulations needs information on NPs size, surface charge, stability and agglomeration behaviour. This approach has many practical challenges, from inadequate knowledge of operating standards to sampling, data interpretation and good laboratory practice for the experiments replicability. However, in drug delivery research, very little literature can provide a clear, succinct explanation of these techniques. Looking for specific guidelines to overcome frequently encountered problems during ZP measurements. This article explores factors influencing colloidal particle stability. Measurement criteria such as applied voltage, number of measurements, electrophoretic mobility (EPM), size distribution, surface shape, temperature, viscosity, particle concentration, zeta potential, nanoparticles, colloidal suspension, electrophoretic mobility, and pH.

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Section: Uncertaintymentioning

confidence: 99%

Experimental methods in chemical engineering: Zeta potential

et al. 2021

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“…Therefore, the nitriding treatment lead to a 13% increase in MB reduction efficiency. A good result, since recent works demonstrated that TiO2 still is one of the best compounds for solar photocatalytic degradation of effluents, in spite of the difficulty in separation and reuse when nanostructures dispersed in solution are utilized [34,35]. Considering this, nitrided TiO2 nanotubes, used in this work, present another advantage over other TiO2 nanostructures since they exhibit higher surface adhesion to substrates, which greatly reduces its disposal together with the photodegraded material.…”

Section: Resultsmentioning

confidence: 86%

A Microfluidic Device Based on Plasma Nitrided Self-Organized TiO2 Nanotubes for Photocatalytic Reduction Study

Bonelli

Pereyra

2018

JICS

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Nitrided TiO2 nanotubes and PDMS microchannel were assembled in a photocatalytic device for organic dyes photo-degradation studies. By integrating a PDMS microchannel with the nitrided TiO2 nanotubes array, a microfluidic photocatalytic device was obtained and characterized by morphological, chemical, and physical points of view. The fabrication process allows an easy integration of the obtained nitrided TiO2 nanotubes with a microchannel into a microfluidic device for pollutant photo-degradation. The high surface-to-volume ratio intrinsic of nanotubes structures has functional properties for harvesting light and is responsible for part of the interesting photocatalytic device performance. Another great advantage of nitrided TiO2 nanotubes compared to just TiO2 nanotubes, is the lower gap of 2.80 eV achieved by plasma nitriding processes in PECVD reactor, which leads to a 14% increase in the photocatalytic response to sun light. As a consequence, the methylene blue reduction efficiency of the microfluidic device fabricated with nitrided TiO2 nanotubes increased 13% compared to that with just anodized TiO2 nanotubes.

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“…HA is the main cause of water color and odor. Furthermore, HA can interact with toxic organic compounds and heavy metal ions and therefore influence the distribution and migration of organic matter and metal ions by hydrophobic distribution, adsorption, charge transfer and static repulsion (Ren et al 2017;Rajaei et al 2021). More seriously, during drinking water disinfection, HA can react with chlorine to produce various by-products which are potentially carcinogenic, deformed and mutated-like (Bond et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of humic acid fractions by a magnetic ion exchange resin

Ding

Wang

et al. 2022

Water Science and Technology

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Natural organic matter in waters varies in different fractions. To better understand the removal of different fractions by a magnetic ion exchange (MIEX) resin and the mechanism behind it, this study investigated adsorption kinetics, equilibrium and thermodynamics of humic acid (HA) fractions with different hydrophilic-hydrophobic properties and molecular weights on MIEX resin through a series of batch experiments. MIEX resin can effectively remove approximately 40% of hydrophilic and 30% of hydrophobic HA components, as well as approximately 44% of molecular weight (MW) <10 kDa to some degree. The removal efficiency of HA fractions by MIEX resin reduced with the increase of pH from 6 to 9. Adsorption kinetics of different HA fractions on MIEX resin fitted the pseudo-second-order model well. With the increase of MW of HA from <1 kDa to >10 kDa, the time to reach adsorption equilibrium reduced from 180 to 120 min. It took more time for the hydrophilic fractions (140 min) to reach the equilibrium than for hydrophobic HA fractions (120 min). The Sips model fitted the adsorption equilibrium data of HA fractions on MIEX resin well. It was revealed that the adsorption of HA fractions on MIEX resin was spontaneous, endothermic and an entropy driven process, and the chemisorption might dominate the adsorption of HA components on MIEX resin. This study is of great significance to the design of magnetic ion exchange resin reactors and the optimization of operational parameters for the removal of natural organic matter with different hydrophilic-hydrophobic properties and molecular weights in different water sources.

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Aggregation behavior of TiO2 nanoparticles in municipal effluent: Influence of ionic strengthen and organic compounds

Cited by 60 publications

References 44 publications

Experimental methods in chemical engineering: Zeta potential

Experimental methods in chemical engineering: Zeta potential

A Microfluidic Device Based on Plasma Nitrided Self-Organized TiO2 Nanotubes for Photocatalytic Reduction Study

Adsorption of humic acid fractions by a magnetic ion exchange resin

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