Deciphering the specific interaction of humic acid with divalent cations at the nanoscale

Lu, Qiuyi; Wang, Zhoujie; Wang, J.-H.; Xie, Lei; Liu, Qingxia; Zeng, Hongbo

doi:10.1016/j.cej.2023.144097

Cited by 9 publications

(11 citation statements)

References 44 publications

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“…The radius of the HAfunctionalized AFM tip used in this work is consistent with our previous reports. 24,27 The detailed HA-functionalization protocol on AFM probes was developed following the previous protocol. 27 In a typical force measurement, the HA-functionalized AFM probe was driven to approach the HA surface at a loading force of 5 nN and a loading velocity of 0.5 μm s −1 and then to retract from the surface to complete a force−separation cycle.…”

Section: Qcm-d Measurementmentioning

confidence: 99%

“…24,27 The detailed HA-functionalization protocol on AFM probes was developed following the previous protocol. 27 In a typical force measurement, the HA-functionalized AFM probe was driven to approach the HA surface at a loading force of 5 nN and a loading velocity of 0.5 μm s −1 and then to retract from the surface to complete a force−separation cycle. By scanning the AFM probe on the surface, force mapping (20 × 20 points on a 2 × 2 μm 2 region) was performed to acquire the two-dimensional arrays of force− separation profiles (400 consecutive force−separation cycles).…”

Section: Qcm-d Measurementmentioning

confidence: 99%

“…It is also noted that the catechol group plays the dominant role in binding with hydrated Pb 2+ /Cd 2+ compared to aniline and benzoic acid groups, most likely due to the higher electrostatic potential (ESP) value for the catechol group. 27 − is relatively strong (−18.2 kcal mol −1 ), leading to the slight adsorption of As(V) on the HA surface. Therefore, the catechol group also plays an important role in the binding of HA with heavy metal oxoanions.…”

Section: Dft Simulation Of the Hms−ha Binding Mechanismmentioning

confidence: 99%

“…Silica sensors coated with HA layers were prepared following the previous protocol. 27 For each adsorption experiment, a 1 mM HMs solution was adjusted to pH 5.8 and the temperature was stabilized at 25 °C. Prior to the adsorption experiment, HAcoated sensors were exposed to Milli-Q water until a stable baseline was recorded.…”

Section: Qcm-d Measurementmentioning

confidence: 99%

“…25 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. 24,27 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. Moreover, quartz crystal microbalance with dissipation (QCM-D) is a unique technique to monitor the mass change of adsorbed layer in situ and in real time, 29,30 which could provide quantitative information on the adsorption and retention of HMs on the HA surface.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Qcm-d Measurementmentioning

confidence: 99%

Section: Qcm-d Measurementmentioning

confidence: 99%

Section: Dft Simulation Of the Hms−ha Binding Mechanismmentioning

confidence: 99%

Section: Qcm-d Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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Bonding Optimization Strategies for Flexibly Preparing Multi‐Component Piezoelectric Crystals

Bai,

Tang,

Xie

et al. 2024

Advanced Materials

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Flexible films with optimal piezoelectric performance and water‐triggered dissolution behavior are fabricated using the co‐dissolution–evaporation method by mixing trimethylchloromethyl ammonium chloride (TMCM‐Cl), CdCl2, and polyethylene oxide (PEO, a water‐soluble polymer). The resultant TMCM trichlorocadmium (TMCM‐CdCl3) crystal/PEO film exhibited the highest piezoelectric coefficient (d33) compared to the films employing other polymers because PEO lacks electrophilic or nucleophilic side‐chain groups and therefore exhibits relatively weaker and fewer bonding interactions with the crystal components. Furthermore, upon slightly increasing the amount of one precursor of TMCM‐CdCl3 during co‐dissolution, this component gained an advantage in the competition against PEO for bonding with the other precursor. This in turn improved the co‐crystallization yield of TMCM‐CdCl3 and further enhanced d33 to ≈71 pC/N, exceeding that of polyvinylidene fluoride (a commercial flexible piezoelectric) and most other molecular ferroelectric crystal‐based flexible films. This study presents an important innovation and progress in the methodology and theory for maintaining a high piezoelectric performance during the preparation of flexible multi‐component piezoelectric crystal films.

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How Do NPK-Organomineral Fertilizers Affect the Soil Availability and Uptake of Iron, Manganese, Copper, and Zinc by Maize Cultivated in Red and Yellow Oxisols?

de Morais,

Silva,

Maluf

et al. 2023

J Soil Sci Plant Nutr

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Deciphering the specific interaction of humic acid with divalent cations at the nanoscale

Cited by 9 publications

References 44 publications

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

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

Bonding Optimization Strategies for Flexibly Preparing Multi‐Component Piezoelectric Crystals

How Do NPK-Organomineral Fertilizers Affect the Soil Availability and Uptake of Iron, Manganese, Copper, and Zinc by Maize Cultivated in Red and Yellow Oxisols?

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