Smectite clay pillared with copper complexed polyhedral oligosilsesquioxane for adsorption of chloridazon and its metabolites

Feng, Yan; Spyrou, Konstantinos; Thomou, Eleni; Kumar, Sumit; Cao, Huatang; Stuart, Marc C. A.; Pei, Yu; Gournis, Dimitrios; Rudolf, Petra

doi:10.1039/c9en00974d

Cited by 10 publications

(6 citation statements)

References 45 publications

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“…As shown in Figure 1C, the peaks around 398, 401, and 402.5 eV correspond to three distinct types of amines: primary, secondary, and quaternary, respectively, in a ratio of 1:0.51:0.43. 54,55 This ratio is consistent with the composition of the silanes used for the functionalization, confirming that for each quaternary ammonium and primary amine present (from TMAC and TMPA, respectively) on the surface of the particles, there are two secondary amines (from TMPA) as illustrated in Figure 1D.…”

Section: ■ Results and Discussionsupporting

confidence: 79%

Probing the Interfacial Properties of Oil–Water Interfaces Decorated with Ionizable, pH Responsive Silica Nanoparticles

et al. 2023

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Particle-stabilized emulsions (Pickering emulsions) have recently attracted significant attention in scientific studies and for technological applications. The interest stems from the ease of directly assembling the particles at interfaces and modulating the interfacial properties. In this paper, we demonstrate the formation of stable, practical emulsions leveraging the assembly of ionizable, pH responsive silica nanoparticles, surface-functionalized by a mixture of silanes containing amine/ammonium groups, which renders them positively charged. Using pH as the trigger, the assembly and the behavior of the emulsion are controlled by modulating the charges of the functional groups of the nanoparticle and the oil (crude oil). In addition to their tunable charge, the particular combination of silane coupling agents leads to stable particle dispersions, which is critical for practical applications. Atomic force microscopy and interfacial tension (IFT) measurements are used to monitor the assembly, which is controlled by both the electrostatic interactions between the particles and oil and the interparticle interactions, both of which are modulated by pH. Under acidic conditions, when the surfaces of the oil and the nanoparticles (NPs) are positively charged, the NPs are not attracted at the interface and there is no significant reduction in the IFT. In contrast, under basic conditions in which the oil carries a high negative charge and the amine groups on the silica are deprotonated while still positively charged because of the ammonium groups, the NPs assemble at the interface in a closely packed configuration yielding a jammed state with a high dilatational modulus. As a result, two oil droplets do not coalesce even when pushed against each other and the emulsion stability improves significantly. The study provides new insights into the directed assembly of nanoparticles at fluid interfaces relevant to several applications, including environmental remediation, catalysis, drug delivery, food technology, and oil recovery.

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Section: ■ Results and Discussionsupporting

confidence: 79%

Probing the Interfacial Properties of Oil–Water Interfaces Decorated with Ionizable, pH Responsive Silica Nanoparticles

et al. 2023

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“…As one can see in Table , compared to other sorbents reported in the literature, our result for chloridazon is high but does not exceed that for adsorption on active carbon, the most frequently employed, commercially available sorbent for remediation of this herbicide. For the remediation of the metabolites desphenyl-chloridazon and methyl-desphenyl-chloridazon, we could not find reported values except in our previous work …”

Section: Resultsmentioning

confidence: 70%

“…For the remediation of the metabolites desphenylchloridazon and methyl-desphenyl-chloridazon, we could not find reported values except in our previous work. 41 Comparative Analysis of the Environmental Impact for Graphene Oxide and Activated Carbon. Because the adsorption capacity of graphene oxide for chloridazon was found to be only 10% lower than that of activated carbon (AC), which is the currently used commercial sorbent, it is worth comparing these two sorbents for what concerns environmental impact to decide whether graphene oxide should be optimized and further developed arrive at a commercially competitive sorbent for remediation of chloridazon and other pollutants from aqueous environments.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Highly Efficient Remediation of Chloridazon and Its Metabolites: The Case of Graphene Oxide Nanoplatelets

et al. 2020

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The contamination of aqueous environments by aromatic pollutants has become a global issue. Chloridazon, a herbicide considered as harmless to the ecosystem, has been widely used in recent decades and has accumulated, together with its degradation products desphenyl-chloridazon and methyl-desphenyl-chloridazon, to a non-negligible level in surface water and groundwater. To respond to the consequent necessity for remediation, in this work, we study the adsorption of chloridazon and its metabolites by graphene oxide and elucidate the underlying mechanism by X-ray photoelectron spectroscopy. We find a high adsorption capacity of 67 g kg–1 for chloridazon and establish that bonding of chloridazon to graphene oxide is mainly due to hydrophobic interaction and hydrogen bonding. These findings demonstrate the potential of graphene-based materials for the remediation of chloridazon and its metabolites from aqueous environments.

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“…Parameters such as the [OH]:[Al 3+ ] ratio, the [Al 3+ ] to clay mineral proportion and the aging temperature have a marked influence on the materials' stability and efficiency [75]. Not only Al 3+ has been employed in the pillarization, but also other cations, such as Fe 3+ [2,17,72,74,[76][77][78][79][80], Ti 4+ [76,81,82], Zr 4+ [73,83], Co 2+ , Ni 2+ and Cu 2+ [84], and Cu 2+ [85]. These works describe the preparation, characterization, and applications for the adsorption or degradation of different organic compounds since they can support catalysts for photodegradation.…”

Section: Intercalated and Pillared Clay Mineralsmentioning

confidence: 99%

“…Excellent reviews addressed the theory and the preparation procedures [68,75] as well as the removal of organic pollutants from wastewater [68]. The intercalation and pillarization processes produced adsorbent materials for different organic pollutants [2,70,73,[85][86][87][88][89] and catalysts or photocatalysts for pollutants degradation/mineralization [69,72,74,82,90]. Among the main applications, the use as adsorbents for pesticides, aiming for water treatment or the preparation of controlled release formulations, deserve highlighting.…”

Section: Intercalated and Pillared Clay Mineralsmentioning

confidence: 99%

Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance

Masini

Abate

2021

Minerals

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Natural and modified clay minerals have been extensively used for the adsorption/desorption of organic substances, especially pesticides, from waters and wastewater, aiming at pollution control and more efficient use of the herbicides through controlled release. While natural clay minerals efficiently remove organic cations such as paraquat and diquat, the adsorption of anionic or neutral species demands surface chemical modification with, for instance, quaternary ammonium salts containing long alkyl chains. Basic pesticides, on the other hand, are better absorbed in clay minerals modified with polycations. Kinetic studies and adsorption/desorption isotherms provide the parameters needed to evaluate the clay mineral’s adsorptive performance towards the pollutant target. However, the direct comparison of these parameters is complicated because the experimental conditions, the analytical techniques, the kinetic and isotherm models, and the numerical fitting method differ among the various studies. The free-energy-related Langmuir constant depends on the degree of site occupation; that is, it depends on the concentration window used to construct the adsorption isotherm and, consequently, on the analytical technique used to quantify the free concentrations. This paper reviews pesticides’ adsorption on natural and modified clay minerals and proposes guidelines for designing batch adsorption/desorption studies to obtain easily comparable and meaningful adsorption parameters. Articles should clearly describe the experimental conditions such as temperature, contact time, total concentration window, the solution to adsorbent ratio, the analytical technique, and its detection and quantification limits, besides the fitting models. Research should also evaluate the competitive effects of humic substances, colloidal inorganic particles, and ionic strength to emulate real-world adsorption experiments.

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Smectite clay pillared with copper complexed polyhedral oligosilsesquioxane for adsorption of chloridazon and its metabolites

Abstract: Copper complexed polyhedral oligomeric silsesquioxane pillared smectite clay (Cu2+@POSS_SWy-2) exhibits excellent adsorption properties for chloridazon and its metabolites.

Cited by 10 publications

References 45 publications

Probing the Interfacial Properties of Oil–Water Interfaces Decorated with Ionizable, pH Responsive Silica Nanoparticles

Probing the Interfacial Properties of Oil–Water Interfaces Decorated with Ionizable, pH Responsive Silica Nanoparticles

Highly Efficient Remediation of Chloridazon and Its Metabolites: The Case of Graphene Oxide Nanoplatelets

Guidelines to Study the Adsorption of Pesticides onto Clay Minerals Aiming at a Straightforward Evaluation of Their Removal Performance

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