The adsorption characteristics and mechanism of montmorillonite with different layer charge density for alkyl ammonium with different carbon chain length

Qiu, Jun; Cui, Kaibo; Wu, Peng; Chen, Guowei; Liu, Dongliang; Jiang, Shan; Wang, Guifang

doi:10.1039/d1nj01683k

Cited by 7 publications

(2 citation statements)

References 33 publications

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“…Six C−H stretching vibration peaks are observed in the 3050–2800 cm −1 region for pure DTAC powder sample, which is attributed to asymmetric stretching (ν as (N−CH 3 ), 3034 cm −1 ) and symmetric stretching (ν s (N−CH 3 ), 3018 cm −1 ) modes of the alkylammonium head group of DTA + , asymmetric methyl stretching (ν as (R−CH 3 ), 2943 cm −1 ) and symmetric methyl stretching (ν s (R−CH 3 ), 2872 cm −1 ) of alkyl tail, asymmetric methylene stretching (ν as (−CH 2 −), 2916 cm −1 ), and symmetric methylene stretching (ν s (−CH 2 −), 2849 cm −1 ) (Figure 6d). [ 47–49 ] In the powder sample synthesized by DTAC and PbI 2 , the overlapping vibrations of the ammonium group (ν as (N−CH 3 ) and ν s (N−CH 3 ), 3021 cm −1 ) suggest the inorganic framework PbI 6 4− form an interaction with the DTA + ammonium group. [ 50 ] The vibrations of ν s (−CH 2 −), ν as (−CH 2 −), and ν as (R−CH 3 ) are shifted to 2852, 2921, and 2954 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Perovskite Solar Cells with Protective Layers Obtained via Interfacial Modification

Wang,

Ran,

Zhao

et al. 2024

Solar RRL

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Currently, achieving both high efficiency and long‐term stability is crucial for the successful application of perovskite solar cells (PSCs). Grain boundary defects significantly impact the stability of PSCs, and passivating these grain boundaries (GBs) remains a major challenge. In this study, the surfactant dodecyltrimethylammonium chloride (DTAC) was dissolved in low‐polarity chlorobenzene (CB) at 58 °C to modify the interface of MAPbI3 film, and DTAC reacted with MAPbI3 film surface to generate a protective layer that could be covered on the perovskite grains, effectively reducing the expose GBs. Additionally, the hydrophobic alkyl chains of DTA+ and the strong chemical bond between the Cl‐ and Pb2+ ions further enhanced the resistance of the perovskite surface layer to heat, moisture, and oxidation. Due to the passivation of iodine vacancy defects, the photo‐stability of unencapsulated DTAC devices is significantly improved. By passivating surface and GBs defects of the MAPbI3 perovskite crystals, the power conversion efficiency (PCE) of the low‐temperature carbon‐based PSCs treated by DTAC is 15.03% compared to 13.97% for the control device. This study offers another referable strategy for enhancing the thermal, moisture, light, and oxygen stability of perovskite materials while considering the photovoltaic performance of devices.This article is protected by copyright. All rights reserved.

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Section: Resultsmentioning

confidence: 99%

Highly Stable Perovskite Solar Cells with Protective Layers Obtained via Interfacial Modification

Wang,

Ran,

Zhao

et al. 2024

Solar RRL

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“…Mt is a kind of aluminosilicate clay mineral with 2 : 1 layered structure. Due to the existence of the isomorphic substitution phenomenon, the tetrahedron–octahedron–tetrahedron layer of Mt has permanent negative charge so that it has a strong cation exchange capacity (CEC) [8] . Some organic cations in the environment can be adsorbed into the interlayer or surface of Mt through ion exchange or physical adsorption [9] .…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Mechanism of the Adsorption of Imidazole Ionic Liquids in Wastewater by Montmorillonite: Effect of Carbon Chain Length and Dosage of Ionic Liquids

et al. 2022

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This paper studied the adsorption characteristics and mechanism of four kinds of ionic liquids (ILs) with different carbon chain lengths in montmorillonite (Mt). The results of isothermal adsorption at 25 °C show that the adsorption of four kinds of IL in Mt conforms to the Modified‐Langmuir model, and the adsorbance of IL in Mt is positively correlated with the dosage and the carbon chain length of IL. The dynamics research results show that the adsorption of IL in Mt fits well with the quasi‐second‐order dynamics equation. The reaction constant k is negatively correlated with the dosage of IL but positively correlated with the carbon chain length. The thermodynamics results show that the adsorption of IL in Mt is exothermic. The carbon chain length and the dosage of IL have a cross effect on the adsorption capacity of Mt for IL and the structure of the adsorption products. The adsorption capacity of Mt increases first and then decreases with the increase of dosage, and it increases with the increase of carbon chain length. The dosage of IL has little effect on the d(001) of IL/Mt with the short carbon chain, but the d(001) of IL/Mt with the long carbon chain increases with the increase of the dosage of IL. The carbon chain length has little effect on the d(001) of IL/Mt with a low dosage of IL, however, when the dosage of IL is high, the d(001) of IL/Mt increases with the increase of carbon chain length. The specific surface area, pore volume and the most probable radius of IL/Mt decrease with the increase of the dosage and carbon chain length, but excessive amounts of IL will still increase the most probable radius. Molecular dynamics simulation results show that when the dosage of IL is 0.3CEC, four ILs with different carbon chain lengths are arranged in a monolayer between Mt layers, N (N in IL) coordinates with Ot (O on the tetrahedral surface) at a distance of 3.0 Å, and the coordination strength increases with the increase of the carbon chain length of IL.

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Molecular dynamics simulation and experimental study of micro‐structure and gel properties of single chain alkyl ammonium intercalated Na‐montmorillonite

Qiu

Chen

Cao

et al. 2022

J of Applied Polymer Sci

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The synergistic effect of layer charge density of Na-montmorillonite (Na-MT), the carbon chain length and the dosage of alkyl ammonium on the microstructure and gel properties of single chain alkyl ammonium intercalated Na-MT was systematically studied by using X-ray diffraction (XRD), molecular dynamics simulation and small-scale experiment. The results of Z-axis density distribution and radial distribution function (RDF) shows that with the increase of the dosage of alkyl ammonium, the distribution pattern is gradually changed from layered to inclined winding and stacking distribution. The results of the self-diffusion coefficient show that the higher the layer charge density of Na-MT, the shorter the length of alkyl ammonium carbon chain, the lower the diffusivity of each component in the inter-layer. With the increase of the dosage of alkyl ammonium, the diffusivity of alkyl ammonium in the inter-layer increases firstly and then decreases. The results of gel properties show that with the increase of the dosage of alkyl ammonium, the colloidal ratio of the alkyl ammonium/Na-MT in xylene gradually increases, while the apparent viscosity in xylene-ethanol increases firstly and then decreases. Furthermore, the longer the carbon chain of alkyl ammonium, the lower the layer charge density of MT, the better the gel properties of the prepared alkyl ammonium/Na-MT.

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The adsorption characteristics and mechanism of montmorillonite with different layer charge density for alkyl ammonium with different carbon chain length

Abstract: The crystal chemical properties of montmorillonite and the length and amount of straight alkyl ammonium chain affect the adsorption characteristics of alkyl ammonium on montmorillonite.

Cited by 7 publications

References 33 publications

Highly Stable Perovskite Solar Cells with Protective Layers Obtained via Interfacial Modification

Highly Stable Perovskite Solar Cells with Protective Layers Obtained via Interfacial Modification

Characteristics and Mechanism of the Adsorption of Imidazole Ionic Liquids in Wastewater by Montmorillonite: Effect of Carbon Chain Length and Dosage of Ionic Liquids

Molecular dynamics simulation and experimental study of micro‐structure and gel properties of single chain alkyl ammonium intercalated Na‐montmorillonite

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