Aggregation and dissolution of ZnO nanoparticles synthesized by different methods: Influence of ionic strength and humic acid

Han, Yosep; Kim, Dong‐Hyun; Hwang, Gukhwa; Lee, Byoungcheun; Eom, Ig-Chun; Kim, Pil Je; Tong, Meiping; Kim, Hyun-Jung

doi:10.1016/j.colsurfa.2014.03.030

Cited by 100 publications

(59 citation statements)

References 53 publications

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“…The specific surface area of the silica was determined via gas physisorption at ¹196°C using a Micromeritics ASAP 2020M analyzer and from nitrogen adsorption data in the partial relative pressure from 0.05 to 0.25 using the BrunauerEmmettTeller (BET) method. 24,25) The specific surface area of silica was determined to be 4.08 m 2 /g. The characterization of surface OH group content was performed via a thermogravimetric (TGA, S-1000, SCINCO) analysis operated at atmospheric pressure.…”

Section: Silica Characterizationmentioning

confidence: 99%

Role of Chain Length and Type on the Adsorption Behavior of Cationic Surfactants and the Silica Floatability

et al. 2014

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In this study, we investigated the adsorption isotherms of cationic surfactants (i.e., distearyl dimethyl ammonium chloride (DDAC), behenyl trimethyl ammonium chloride (BTAC), and stearyl trimethyl ammonium chloride (STAC)) onto silica surface and the corresponding silica floatability according to chain type and length of cationic surfactants. The results for the adsorption isotherms of cationic surfactants showed that the adsorptive amounts increased with increasing surfactant concentration, but differences in the position of the adsorption isotherms existed between DDAC, BTAC, and STAC. Specifically, in the high range of initial surfactant concentrations (i.e., 10 ¹5 10 ¹3 M), the adsorptive amounts increased with increasing hydrocarbon chain length. In addition, in the presence of DDAC, the adsorptive amounts were much greater than those in the presence of BTAC and STAC. The results were attributed to the fact that the increase in the hydrocarbon chain group of surfactants decreased the Gibbs free energy of the system, resulting in a shift of hemimicelle concentration toward lower concentration. Meanwhile, in the low range of initial surfactant concentrations (i.e., 5 © 10 ¹7 5 © 10 ¹6 M), the adsorptive amounts were comparable regardless of surfactant type, which was due to the fact that the interaction between the cationic surfactants and the silica surface was mainly governed by electrostatic attractive force. The results from silica flotation and hydrophobicity tests showed that silica floatability increased with increasing hydrocarbon chain group of surfactants (i.e., floatability was in the order of DDAC > BTAC > STAC) under the conditions where the adsorptive amounts of the surfactants were comparable and that floatability results were consistent with those for the hydrophobicity of silica surface. Overall, the findings from the present study suggested that the hydrocarbon chain length and type of cationic surfactants play a significant role in both the adsorption behavior of surfactants and the silica floatability.

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Section: Silica Characterizationmentioning

confidence: 99%

Role of Chain Length and Type on the Adsorption Behavior of Cationic Surfactants and the Silica Floatability

et al. 2014

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“…Unlike other more environmentally stable metal oxides, such as TiO 2 , the oxidation potential of ZnO is more negative than that of H 2 O molecules leading to easier potential dissolution or oxygen atoms in the ZnO lattice rather than H 2 O molecules oxidized by photogenerated holes that produce Zn 2+ under band gap excitation . The poor dispersity and stability of ZnO suspension not only significantly affect the performance of ZnO, but some studies have shown that dissolved Zn 2+ ions cause harm to aquatic organisms …”

Section: Introductionmentioning

confidence: 99%

Improved stability and dispersity of ZnO@PANI nanocomposites aqueous suspension

Jin

Liu

Bao

et al. 2018

Applied Organom Chemis

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The high dispersion and stability of a nanocomposites suspension are required as a crucial factor in many of their applications. In this study, ZnO nanosheets covered with polyaniline (PANI) thin layer (ZnO@PANI) were synthesized by a simple in‐situ polymerization. The as‐prepared ZnO@PANI powders were well characterized by XRD, Raman, FTIR, XPS and photoluminescence spectra, as well as SEM and TEM techniques. The effect of PANI incorporation on the chemical dissolution and dispersing stability of ZnO aqueous suspension was investigated. Dissolution experiments showed that the dissolution of ZnO was effectively restrained by the surface‐hybridized PANI layer. ZnO@PANI suspension can be more stable in a wider pH range. Dynamic Light Scattering (DLS) analysis indicated that ZnO@PANI particles were thoroughly dispersed in the neutral and alkaline solution as proven by the emergence of a single distribution with a high diffused intensity. Sedimentation experiments suggested that ZnO@PANI suspension was a more stable dispersion taking into account the effect of pH and ionic strength.

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“…There are many functional groups in HA molecules, and the functional groups endow the molecules some abilities to functionalize as an electron-transfer mediator during organic contaminants degradation processes [5][6][7]. HA molecules could also cause some adverse environmental consequences due to the characteristics of HA molecules.…”

Section: Introductionmentioning

confidence: 99%

“…Humic acids (HA) are widely existed in natural environment, such as in groundwater, surface water, drinking water, and soil [ [1][2][3][4][5]. There are many functional groups in HA molecules, and the functional groups endow the molecules some abilities to functionalize as an electron-transfer mediator during organic contaminants degradation processes [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

Jiao

Xiao

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Aggregation and dissolution of ZnO nanoparticles synthesized by different methods: Influence of ionic strength and humic acid

Cited by 100 publications

References 53 publications

Role of Chain Length and Type on the Adsorption Behavior of Cationic Surfactants and the Silica Floatability

Role of Chain Length and Type on the Adsorption Behavior of Cationic Surfactants and the Silica Floatability

Improved stability and dispersity of ZnO@PANI nanocomposites aqueous suspension

Enhanced removal for humic-acid (HA) and coagulation process using carbon nanotubes (CNTs)/polyalumium chloride (PACl) composites coagulants

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