Double-Edged Effect of Humic Acid on Multiple Sorption Modes of Calcined Layered Double Hydroxides: Inhibition and Promotion

Qiu, Xinhong; Sasaki, Keiko; Xu, Shuang; Zhao, Jiawen

doi:10.1021/acs.langmuir.8b04196

Cited by 13 publications

(5 citation statements)

References 43 publications

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“…Thanks to the robust phosphorus removal of LDH structure, CZF achieved better co-uptake under dramatic HA interference. Compared with other LDH-adsorbents [42], this work has faced down the issue of HA interference on phosphorus due to the fixing advantage of the host materials. Further investigation of metal leaching in the presence of HA is required.…”

Section: Mechanisms In Simultaneous Adsorptionmentioning

confidence: 99%

Simultaneous adsorption study of ammonium and phosphate by ZnFe-layered double hydroxide (ZnFe-LDH)-modified adsorbents.

Liu¹,

Liang²,

Li³

et al. 2020

Preprint

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Background Trace amounts of nitrogen and phosphorus can easily trigger eutrophication damage in surface water, while cost-effective adsorption treatment is in prospect for clearing these pollutants simultaneously and efficiently. In this study, engineered adsorbents decorated with ZnFe-LDH by alkaline coprecipitation (3-6 mm, with modified ceramsite as CZF and modified volcanic rock as VZF) were prepared for NH 4 + and H 2 PO 4 - co-adsorption from aqueous solutions.Results Coexisting ions showed great effects on phosphate adsorption, especially Ca 2+ and CO 3 2- , and humic acid exhibited only a limited shielding impact on co-adsorption properties. Though comprehensive tests presented that the maximum captured amount of ammonium and phosphate occurred at pH 7, the isotherm and kinetic results suggest that two adsorbents preferentially adsorbed each pollutant. Specifically, the maximum uptake quantity of NH 4 + (15.55 mg-N g -1 ) and H 2 PO 4 - (11.21 mg-P g -1 ) were achieved by VZF and CZF, respectively, and controlled by physisorption and chemisorption distinctively, revealing that contaminants were cleared in disparate ways. Performances of seven consecutive adsorption/desorption cycles using 5% NaOH regenerant suggested that CZF retained 71.9% of PO 4 - removal efficiency, and VZF retained 47.9% of the NH 4 + adsorption rate, implying the strong reusability of ZnFe-LDH-modified adsorbents. A dynamic study has assessed that with 1 kg of combined modified adsorbents, approximately 527 L of polluted runoff flow could be continuously treated to below the National limits within one adsorption cycle.Conclusion Comparing with other parallel adsorbents, ZnFe-LDH-modified adsorbent is promising in eliminating eutrophication due to their superior capacity, stability, renewability, and non-toxicity.

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Section: Mechanisms In Simultaneous Adsorptionmentioning

confidence: 99%

Simultaneous adsorption study of ammonium and phosphate by ZnFe-layered double hydroxide (ZnFe-LDH)-modified adsorbents.

Liu¹,

Liang²,

Li³

et al. 2020

Preprint

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“…However, the transformation of these hydrotalcite structures is closely related to environmental factors. The previous studies show that HA can indeed affect the regeneration of hydrotalcite structures and can even affect the mechanism by which they remove pollutants . However, this research has been conducted at the macromolecular level and does not use a simple functional group model to further explore its interaction with hydrotalcite.…”

Section: Resultsmentioning

confidence: 99%

Effect of Natural Organic Matter Model Compounds on the Structure Memory Effect of Different Layered Double Hydroxides

Zhao

et al. 2019

ACS Earth Space Chem.

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The structural transformation of layered double hydroxides (LDHs) plays an important role in a variety of natural environmental behaviors. As one of the important ways of structure transformation in LDHs, the structure memory effect closely interacted with humic acid (HA). However, the role of functional groups in HA is unclear because its structure is relatively complex. Therefore, seven representative small molecules of single or double aromatic compounds were selected to explore their influence on the regeneration of different LDHs, thereby revealing key function groups in HA. As a result, ortho-benzene compounds could more effectively affect the regeneration of LDHs than other model compounds. For these compounds, the aliphatic chain length and aromatic ring size have little effect on regeneration of LDHs. However, increasing the number of carboxyl or hydroxyl groups affected the results, although all of them accelerated the regeneration rate of LDHs. Additionally, LDHs during the regeneration have a positive adsorption effect on both o-carboxyl and o-hydroxyl aromatic compounds; however, they have shown different effects on the regeneration of LDHs. Phthalic acid revealed no effect on the structure and crystallinity of regenerated LDH, while catechol inhibited the regeneration process and decreased the crystallinity of regenerated LDHs. The effects of o-hydroxyl aromatic compounds, such as catechol, are also dependent upon the type of LDHs. They have an inhibitory effect on the crystallinity of the regenerated Mg−LDH within a short time or with a high concentration but have no effect on its morphology. Although o-hydroxyl aromatic compounds have no effect on the crystallinity of regenerated Ca−LDH, the crystal growth was suppressed. This is due to the difference in the regeneration processes between two LDHs. These results provide a more detailed theoretical basis for understanding the influence of HA on the structural transformation of LDHs or even other minerals, such as hydroxides, in the environment.

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“…12 Layered double hydroxides (LDHs) have been applied to the field of corrosion resistance due to the advantages of twodimensional sheet structures and small sizes, high loadings, and easy modification. 13 The interlayer regions of LDHs contain both interlayer anions and water molecules, and there is a complex network of hydrogen bonds between layer hydroxyl groups, anions, and water molecules. The general formula of LDHs is [M 2+ 1−x M 3+ (OH) 2 ] x+ (A n− )x/n•mH 2 O, where the cations M 2+ and M 3+ occupy the octahedral holes in a brucite-like layer; the metal anion A n− is located in the hydrated interlayer galleries, which can be replaced by other anions; and n is the charge of the interlayer anion.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Layered double hydroxides (LDHs) have been applied to the field of corrosion resistance due to the advantages of two-dimensional sheet structures and small sizes, high loadings, and easy modification . The interlayer regions of LDHs contain both interlayer anions and water molecules, and there is a complex network of hydrogen bonds between layer hydroxyl groups, anions, and water molecules.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime

et al. 2021

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Both a superhydrophobic structure and layered double hydroxide (LDH) coating were effective to improve the corrosion resistance of alloys. In this study, a superhydrophobic composite coating based on LDHs was constructed on Mg alloy by laser treatment, in situ growth of Mg-Al LDHs, and modification with octadecyl-trimethoxy-silane (OTS). The so-obtained composite coating was coded as L-LDHs-OTS, where L stands for laser treatment. Results showed that the L-LDHs-OTS composite coating presented the best anti-corrosion performance and the corrosion current density was reduced by about 5 orders of magnitude compared with that of the Mg alloy substrate. The excellent corrosion resistance was related to the superhydrophobicity of the composite coating, the compactness and ion-exchange capacity of the LDH layer, and the dense Si-O-Si network within the OTS layer. Moreover, the L-LDHs-OTS composite coating was still effective after 20 days of immersion tests, showing good long-term corrosion resistance due to the existence of hydrophobicity of the composite coating and the self-healing ability of LDHs.

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Double-Edged Effect of Humic Acid on Multiple Sorption Modes of Calcined Layered Double Hydroxides: Inhibition and Promotion

Cited by 13 publications

References 43 publications

Simultaneous adsorption study of ammonium and phosphate by ZnFe-layered double hydroxide (ZnFe-LDH)-modified adsorbents.

Simultaneous adsorption study of ammonium and phosphate by ZnFe-layered double hydroxide (ZnFe-LDH)-modified adsorbents.

Effect of Natural Organic Matter Model Compounds on the Structure Memory Effect of Different Layered Double Hydroxides

Superhydrophobic and Self-Healing Mg-Al Layered Double Hydroxide/Silane Composite Coatings on the Mg Alloy Surface with a Long-Term Anti-corrosion Lifetime

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