Nanomechanical insights into hydrophobic interactions of mineral surfaces in interfacial adsorption, aggregation and flotation processes

Wang, Zhoujie; Lu, Qiuyi; Wang, Jingyi; Liu, Jing; Sun, Wei; Xie, Lei; Liu, Qi; Zeng, Hongbo

doi:10.1016/j.cej.2022.140642

Cited by 10 publications

(7 citation statements)

References 198 publications

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“…We propose potential mechanisms for the attractive force between hydrophobic AC and Chlorella in water based on literature (Figure 5g). [43][44][45][46][47][48] Micro-nano air film on the surface of hydrophobic AC, influenced by liquid pressure, create a high-energy reaction field. The interfacial collapse triggers the generation of hydroxyl radicals by dispersing the surged chemical potential at the interface.…”

Section: Resultsmentioning

confidence: 99%

3D Monolayer Silanation of Porous Structure Facilitating Multi‐Phase Pollutants Removal

Zhuang

Jiao

et al. 2023

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Activated carbon (AC) is widely used to removing hazardous pollutants from air and water, owing to its exceptional adsorption properties. However, the high affinity of water molecules with the surface oxygen‐containing functional groups can adversely affect the adsorption performance of AC. In this study, a facile and efficient method is presented for fabrication of hydrophobic AC through surface monolayer silanation. Compared to initial AC, the hydrophobic AC improves the water contact angle from 29.7° to 123.5° while maintaining high specific surface area and enhances the removal capacity of multi‐phase pollutants (emulsified oil and toluene). Additionally, the hydrophobic AC exhibits excellent adsorption capability to harmful algal bloom species (Chlorella) (97.56%) and algal organic matter (AOM) (96.23%) owing to electrostatic interactions and surface hydrophobicity. The study demonstrates that this method of surface monolayer silanation can effectively weaken the effect of water molecules on AC adsorption capacity, which has significant potential for practical use in air and water purification, as well as in the control of harmful algal blooms.

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Section: Resultsmentioning

confidence: 99%

3D Monolayer Silanation of Porous Structure Facilitating Multi‐Phase Pollutants Removal

Zhuang

Jiao

et al. 2023

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“…Atomic force microscopy (AFM) has been employed to quantitatively measure the intermolecular interactions between NOM and a variety of surfaces in complex aqueous systems at the nanoscale. − Based on chemical force microscopy (CFM), the intermolecular forces of humic acid (HA, a representative class of NOM, typical molecular structure as shown in Figure S1) interacting with monolayered surfaces of various well-defined chemical groups were quantitatively measured, which helped develop an efficient strategy for reversible adsorption and release of HA . Recently, the interaction forces between HA-functionalized AFM probes and HA surfaces were quantified in aqueous environments containing NaCl or different types of divalent cations, which unraveled the complex aggregation mechanism of HA at the molecular level. , By quantitative investigation of the intermolecular interactions of HA–HM–HA systems, the binding mechanism of HA with different types of HMs could be deciphered at the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Insights into the Interaction Mechanism Underlying the Adsorption and Retention of Heavy Metal Ions by Humic Acid

Wang,

Lu,

Liu

et al. 2024

Environ. Sci. Technol.

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The mobility and distribution of heavy metal ions (HMs) in aquatic environments are significantly influenced by humic acid (HA), which is ubiquitous. A quantitative understanding of the interaction mechanism underlying the adsorption and retention of HMs by HA is of vital significance but remains elusive. Herein, the interaction mechanism between HA and different types of HMs (i.e., Cd(II), Pb(II), arsenate, and chromate) was quantitatively investigated at the nanoscale. Based on quartz crystal microbalance with dissipation tests, the adsorption capacities of Pb(II), Cd(II), As(V), and Cr(VI) ionic species on the HA surface were measured as ∼0.40, ∼0.25, ∼0.12, and ∼0.02 nmol cm −2 , respectively. Atomic force microscopy force results showed that the presence of Pb(II)/Cd(II) cations suppressed the electrostatic double-layer repulsion during the approach of two HA surfaces and the adhesion energy during separation was considerably enhanced from ∼2.18 to ∼5.05/∼4.18 mJ m −2 . Such strong adhesion stems from the synergistic metal−HA complexation and cation−π interaction, as evidenced by spectroscopic analysis and theoretical simulation. In contrast, As(V)/Cr(VI) oxo-anions could form only weak hydrogen bonds with HA, resulting in similar adhesion energies for HA−HA (∼2.18 mJ m −2 ) and HA−As(V)/Cr(VI)−HA systems (∼2.26/∼1.96 mJ m −2 ). This work provides nanoscale insights into quantitative HM−HA interactions, improving the understanding of HMs biogeochemical cycling.

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“…Serpentine is a typical magnesium silicate clay mineral with a 1:1 layered structure, one tetrahedral SiO sheet alternating with one octahedral MgOH sheet flanked by an edge plane composed of MgSiO. , Serpentine commonly coexists with sulfide minerals in ore deposits, and froth flotation is a versatile technique for selectively separating value sulfide minerals from gangue serpentine . During the flotation process, large amounts of serpentine fine particles are entrained in the water film confined between bubbles and float to the froth layer containing sulfide minerals, which makes it challenging to realize the selective separation .…”

Section: Introductionmentioning

confidence: 99%

“…24,25 Serpentine commonly coexists with sulfide minerals in ore deposits, and froth flotation is a versatile technique for selectively separating value sulfide minerals from gangue serpentine. 26 During the flotation process, large amounts of serpentine fine particles are entrained in the water film confined between bubbles and float to the froth layer containing sulfide minerals, which makes it challenging to realize the selective separation. 27 The aggregation of serpentine fine particles could effectively alleviate the detrimental entrainment of serpentine, while the aggregation or dispersion states of serpentine particles closely correlate to their surface charge information.…”

Section: ■ Introductionmentioning

confidence: 99%

Facet-Dependent Charge Density of Serpentine: Nanoscopic Implications for Aggregation and Entrainment of Fine Particles

Wang,

Xiang,

Wang

et al. 2023

Langmuir

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Nanomechanical insights into hydrophobic interactions of mineral surfaces in interfacial adsorption, aggregation and flotation processes

Cited by 10 publications

References 198 publications

3D Monolayer Silanation of Porous Structure Facilitating Multi‐Phase Pollutants Removal

3D Monolayer Silanation of Porous Structure Facilitating Multi‐Phase Pollutants Removal

Nanoscale Insights into the Interaction Mechanism Underlying the Adsorption and Retention of Heavy Metal Ions by Humic Acid

Facet-Dependent Charge Density of Serpentine: Nanoscopic Implications for Aggregation and Entrainment of Fine Particles

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