Exploration of adsorption mechanism of 2-phosphonobutane-1,2,4-tricarboxylic acid onto kaolinite and montmorillonite via batch experiment and theoretical studies

Zhu, Sidi; Wang, Tianyi; Bano, Zahira; Xia, Mingzhu

doi:10.1016/j.jhazmat.2020.123810

Cited by 108 publications

(21 citation statements)

References 62 publications

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“…It was observed that adsorption was increased by increasing the adsorbent dosage, but after 2 g of adsorbent dose, the removal rate remained the same with no further improvement. By increasing the adsorbent dose, more empty spaces were available due to an increased surface area and the adsorption rate increased ( Figure 5 c) [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Mutahir

Irfan²,

Nadeem³

et al. 2022

Molecules

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This work reports the formation of a novel adsorbent, prepared by activating bentonite with cinnamic acid, which is highly efficient to remove dyes from wastewater. The adsorption efficiency of the cinnamic acid activated bentonite was compared with unmodified bentonite by removing methyl orange and rhodamine-B from polluted water. The characterization was performed through X-ray diffraction (XRD) Fourier transform infrared (FTIR) and scanning electron microscopy (SEM). The results indicated that acidic pH and low temperature were more suitable for the selected dyes adsorption. The analysis of the data was done by the Langmuir and Freundlich isotherms; the Freundlich isotherm showed more suitability for the equilibrium data. The data were further analyzed by pseudo-first and pseudo-second-order models to study adsorption kinetics. The results showed that methyl orange and rhodamine-B adsorption obeyed pseudo-order kinetics. The results obtained from this research suggested that acid activation of bentonite with cinnamic acid increased the surface area of the clay and hence enhanced its adsorption efficiency. The maximum adsorption efficiency for the removal of methyl orange and rhodamine-B was up to 99.3 mg.g−1 and 44.7 mg.g−1, respectively, at 25 °C. This research provides an economical modification technique of bentonite, which makes it cost-effective and a good adsorbent for wastewater treatment.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Mutahir

Irfan²,

Nadeem³

et al. 2022

Molecules

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“…In order to shed light on the adsorption mechanism of gas-Ag/CCO, we employed the electrostatic and van der Waals potential analysis based on a cluster model via the basic set of PBE0-D3(BJ) . The electrostatic potential is important for examining electrostatic interactions between molecules to predict the reaction sites.…”

Section: Resultsmentioning

confidence: 99%

Hybridized Ag-CuCrO₂ Nanostructured Composites for Enhanced Gas Sensing

Kong

Liu

et al. 2022

ACS Appl. Nano Mater.

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Because of the special layered structure and catalytic properties, delafossite CuCrO2 has been extensively studied and can obtain outstanding performance by noble metal coupling. In this work, the Ag-decorated CuCrO2 hybridizations have been elaborated by a thermal evaporation method. Surface morphology characterization and chemical state analysis were combined to indicate that the isolated island distribution of Ag nanoclusters and the generation of a divalent copper ion may result in an improvement in the gas response toward 100 ppm volatile organic compounds, such as formaldehyde (38.7%), methanol (56.8%), and acetone (76.3%). First-principle calculations were carried out to demonstrate the sensing mechanism of the Ag-decorated CuCrO2, where the remarkable change in geometry and electronic structure provided the active interface and noble metal catalysis effect promoting the target gas adsorption and reaction process. Therefore, in this work, we propose that the thermal evaporation can be utilized to act as a controllable modification method to construct nanostructure gas sensors, and the fundamental enhancement mechanism is useful to guide the design of efficient delafossite-based composite catalysts.

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“…Many studies have been published on the flocculation settlement laws of suspended particles in slime water (Chen et al, 2015(Chen et al, , 2019Y. Li et al, 2019;Kim et al, 2020;Yan et al, 2021;Zhu et al, 2021). Montmorillonite not only has large surface activity, but can also change the fluid characteristics of the liquid.…”

Section: Introductionmentioning

confidence: 99%

Study of flocculation performance and mechanism of ultrafine montmorillonite particles with NPAM

Wang¹,

Min²,

Chen³

et al. 2022

Physicochem. Probl. Miner. Process.

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Ultrafine montmorillonite particles are the main clay minerals in industrial wastewater. In order to explore the flocculation performance and mechanism of flocculant with montmorillonite, the effects of nonionic polyacrylamide (NPAM) dosage and molecular weight on flocculation effect were studied using a flocculation sedimentation experiment. The morphology of flocs was observed by metallographic microscope and scanning electron microscope, and the microscopic adsorption mechanism was studied utilizing density functional theory (DFT). The results show that the best reagent system for the montmorillonite sample is that the molecular weight of NPAM is 14 million and the added amount is 100 g/t. The floc size increases with rising NPAM dosage, forming a unique multilevel compact space network structure through polymer bridging. The adsorption energy of acrylamide on the Na-( 001) surface of montmorillonite is -108.81 kJ/mol, which is significantly higher than -50.66 kJ/mol on the None-(001) surface. Hydrogen bonding is not the main reason for the adsorption of acrylamide on the montmorillonite surface. NPAM mainly causes the flocculation and sedimentation of montmorillonite through the processes of polymer bridging and electrostatic attraction. This study can provide a theoretical basis for the design and synthesis of new flocculants.

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Exploration of adsorption mechanism of 2-phosphonobutane-1,2,4-tricarboxylic acid onto kaolinite and montmorillonite via batch experiment and theoretical studies

Cited by 108 publications

References 62 publications

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Hybridized Ag-CuCrO₂ Nanostructured Composites for Enhanced Gas Sensing

Study of flocculation performance and mechanism of ultrafine montmorillonite particles with NPAM

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Exploration of adsorption mechanism of 2-phosphonobutane-1,2,4-tricarboxylic acid onto kaolinite and montmorillonite via batch experiment and theoretical studies

Cited by 108 publications

References 62 publications

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Synthesis and Micromechanistic Studies of Sensitized Bentonite for Methyl Orange and Rhodamine-B Adsorption from Wastewater: Experimental and DFT-Based Analysis

Hybridized Ag-CuCrO2 Nanostructured Composites for Enhanced Gas Sensing

Study of flocculation performance and mechanism of ultrafine montmorillonite particles with NPAM

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Product

Resources

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Hybridized Ag-CuCrO₂ Nanostructured Composites for Enhanced Gas Sensing