The multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite

Li, Zhaohui; Chang, Po Hsiang; Jiang, Wei Teh; Jean, Jiin-Shuh

doi:10.1016/j.cej.2018.11.230

Cited by 13 publications

(26 citation statements)

References 43 publications

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“…As described in the manuscript (Section 2, Fig.1b), metoprolol displays two pKa, pKa1 = 9.67 and pKa2 = 14.09 respectively [1]. However, when the equilibrium solution pH is between pKa1 and pKa2, metoprolol is neutral rather than zwitterionic, as confirmed by numerous studies in the literature [2][3][4][5].…”

supporting

confidence: 66%

“…In a recent work published in Chemical Engineering Journal, Li and co-authors [1] reported the adsorption of metoprolol onto montmorillonite under various experimental conditions. Even if the scientific quality of this paper cannot be disclaimed, the presented speciation diagram of metoprolol and several consequent discussions presented in this article appear to be inappropriate.…”

mentioning

confidence: 99%

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Comment on “The multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite”

Thiebault

2019

Chemical Engineering Journal

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In the work "the multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite", published in Chemical Engineering Journal, montmorillonite are used as an an adsorbent for the uptake of metoprolol under various experimental conditions. The results are interesting but the authors has made a mistake when assessing the speciation of metoprolol. This β-blocker is mostly neutral rather than zwitterionic for pH values up to pKa1. This mistake may induce confusion and false conclusions for the readers of Chemical Engineering Journal unfamiliar with such organic contaminants, especially when assessing the impact of pH on the adsorption mechanisms of metoprolol onto clay minerals.

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supporting

confidence: 66%

mentioning

confidence: 99%

Comment on “The multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite”

Thiebault

2019

Chemical Engineering Journal

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“…Hence, the cation exchange extent depends on the starting concentration, the solid/liquid ratio and the compensating cation (C. Wang et al, 2009). Moreover, the conformation of adsorbed PPs is also affected by the amount of PPs adsorbed, especially in the interlayer space (Aristilde, Lanson, & Charlet, 2013;Z. Li, Chang, Jiang, & Jean, 2019;Okaikue-Woodi et al, 2018).…”

Section: Adsorption Of Cationic and Zwitterionic Ppsmentioning

confidence: 99%

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Thiebault

2019

Critical Reviews in Environmental Science and Technology

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The occurrence of pharmaceutical products (PPs) within environmental compartments challenges the scientific community and water treatment operators to find suitable and practicable removal solutions. Clay minerals are among the oldest and cheapest adsorbents used for the removal of organic and inorganic pollutants. However, despite their significant adsorption properties, little is known about their potential to remove organic contaminants such as pharmaceutical products from wastewater effluents. Hence, based on the latest published articles this review aims to standardize the adsorption properties of clay minerals for the removal of PPs. Specifically, the charge state of PPs appears to play a key role in their adsorption mechanism. In order to overcome the limitations of batch experiments (i.e. idealized solutions, static conditions) and design of a field solution, the impact of external parameters on the adsorption capacities of clay minerals is reviewed. The effect of thermal treatment and acid activation of clay minerals is also assessed in order to better understand the consequences of such modifications on the adsorption properties of clay-based adsorbents. Finally, even if most authors agree on the potential of clay-based adsorbents for the removal of PPs from wastewater, there remain significant gaps in the existing literature that need to be filled, with the aim of forecasting the real potential of clay-based treatment for the removal of pharmaceutical products at industrial scale.

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“…The phase of these samples is characterized by XRD. As shown in Figures 2(a)-2(f), by comparing the diffraction peaks with the standard cards, it is confirmed that the materials are correspondingly attapulgite, halloysite, sepiolite, montmorillonite, kaolinite, and diatomite, respectively [50][51][52][53][54][55].…”

Section: Resultsmentioning

confidence: 58%

Natural Nanominerals Show Enzyme-Like Activities

Feng

Wang

Zhang

et al. 2021

Journal of Nanomaterials

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Natural nanominerals (NNMs) are progressively deposited during earth’s formation. They have shown a broad range of applications from industrial catalysis, environmental treatment, and earth science to pharmaceutics due to their unique nanostructures and characteristics. Here, we first report that NNMs have intrinsic enzyme-like properties and show good biocompatibility. First, we characterized the morphology and structure of the six most representative NNMs including sepiolite, attapulgite, halloysite, montmorillonite, kaolinite, and diatomite by SEM, TEM, and XRD. Then, we quantitatively tested their peroxidase- (POD-), catalase- (CAT-), oxidase- (OXD-), and superoxide dismutase- (SOD-) like activities. The results indicate that different kinds of NNMs show varying degrees of POD-like, CAT-like, and SOD-like activities and minor OXD-like activity. Finally, we tested their cytotoxicity and found that the selected representative NNMs have no or less influence on cell viability, showing high biosafety. At present, NNMs have been widely used, mostly focusing on the physical and chemical properties, such as luminescence and conductivity. Our work promotes the understanding of NNMs, providing a new direction for the better application of NNMs.

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The multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite

Cited by 13 publications

References 43 publications

Comment on “The multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite”

Comment on “The multi-mechanisms and interlayer configurations of metoprolol uptake on montmorillonite”

Raw and modified clays and clay minerals for the removal of pharmaceutical products from aqueous solutions: State of the art and future perspectives

Natural Nanominerals Show Enzyme-Like Activities

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