Nonlinear sorption of phenols and anilines by organobentonites: Nonlinear partition and space limitation for partitioning

Wu, Wenhao; Yuan, Liang; Zeng, Yaxiong; Lin, Daohui; Yang, Kun

doi:10.1016/j.scitotenv.2020.139609

Cited by 11 publications

(5 citation statements)

References 47 publications

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“…For example, the nonlinear partition mechanism was proposed and used to interpret the nonlinear sorption of organic compounds by soils [ 15 , 18 , 19 ]. It was verified in our studies by the nonlinear and high sorption of organic compounds to a resin ADS-12, humus-like substances humificated from rice straw, and organobentonites, respectively, all of which were with undetectable surface area [ 17 , [20] , [21] , [22] ]. The linear adsorption mechanism was also proposed and used to interpret the linear sorption of organic compounds to carbon nanotubes (CNTs) under the competitive sorption of coexisted solutes [ 16 , 23 ].…”

Section: Introductionsupporting

confidence: 65%

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Linear adsorption of organic compounds on mesoporous activated carbon in bi-solute system

Liu,

Wu,

Lin

et al. 2024

Heliyon

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Section: Introductionsupporting

confidence: 65%

“…1 , Fig. 2 ), which disagreed with the characteristic of partition mechanism that the K d of organic compound was proportional to the contents of partition phase in sorbents [ 21 , 41 , 42 ]. Hence, the linear isotherms of organic compounds on MAC in the presence of ≥1400 mg/L 4-nitrophenol ( Fig.…”

Section: Resultsmentioning

confidence: 78%

Linear adsorption of organic compounds on mesoporous activated carbon in bi-solute system

Liu,

Wu,

Lin

et al. 2024

Heliyon

Self Cite

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“…The adsorption mechanism of aniline and TNT on loess colloid particles (Figure 5) is the result of a combination of van der Waals force, hydrogen bonding, and electrostatic interactions. The following factors contributed to the differences in adsorption between TNT and aniline: (1) The large specific surface area, specific surface energy, and pore size distribution (Table S5) of loess colloid particles enable the adsorption of both aniline and TNT through van der Waals forces, occurring on the surface and interior of the particles [54][55][56]. (2) The surface of loess colloid particles contains abundant functional groups, such as -OH and -COOH, which can act as hydrogen bonding donors, forming hydrogen bonds with nitrogenous functional groups in aniline and TNT [57][58][59].…”

Section: The Proposed Adsorption Mechanismmentioning

confidence: 99%

“…(1) The large specific surface area, specific surface energy, and pore size distribution (Table S5) of loess colloid particles enable the adsorption of both aniline and TNT through van der Waals forces, occurring on the surface and interior of the particles [54][55][56]. (2) The surface of loess colloid particles contains abundant functional groups, such as -OH and -COOH, which can act as hydrogen bonding donors, forming hydrogen bonds with nitrogenous functional groups in aniline and TNT [57][58][59].…”

Section: The Proposed Adsorption Mechanismmentioning

confidence: 99%

Co-Transport of Aniline and TNT with Loess Colloid Particles in Saturated Loess Columns: Mechanism and Processes

Meng,

Hu,

Sun

et al. 2024

Water

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The transport of mobile colloidal particles with organic pollutants in porous media has attracted considerable attention. Aniline and 2,4,6-trinitrotoluene (TNT), as aromatic compounds and key components of energetic materials, are continuously released into the environment. This study compared the co-transport of loess colloidal particles with aniline and TNT, aiming to investigate the influence of structural and physicochemical properties of the pollutants. The colloids were prepared and characterized, and static adsorption and dynamic column experiments were conducted. The results indicate that the adsorption processes of aniline and TNT both conformed to the quasi-second-order kinetic and the intra-particle diffusion models, with aniline exhibiting higher rate constants than TNT. The main adsorption mechanism involved van der Waals force, hydrogen bonding, and electrostatic interaction. Response surface experiments indicated that the adsorption capacity increased with higher initial concentration of organic compound but decreased with larger particle size and higher Na+ concentration. In column experiments, the adsorption of loess colloid particles on aniline and TNT was strongly correlated with the concentration of loess colloid particles. Loess colloid particles could be used as carriers to enhance the co-transport, with aniline exhibiting a faster transport rate due to the differences in polarity and molecular structure compared to TNT. In summary, loess colloidal particles enhanced the transport behavior of aniline and TNT in saturated loess columns. The differences in polarity and molecular structure of aniline and TNT further affect their co-transport mechanism in loess.

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“…Leachate from sanitary landfilling, however, typically contains organic contaminants and heavy metal ions, damaging both the local ecological environment and public health [ 3 , 4 , 5 ]. Organic pollutants significantly harm biological and human health, weaken the body’s defenses against illness, and result in birth abnormalities and reproductive issues [ 6 , 7 , 8 ]. Heavy metal ions could pose a major threat to ecosystems and human health even at low concentrations because of their high mobility, bioaccumulation, tremendous toxicity, and cancer-causing potential [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Impermeability of Nanodispersible Modified Bentonite Based on Colloidal Osmotic Pressure Mechanisms and the Adsorption of Harmful Substances

Zhang

Gong

et al. 2023

Nanomaterials

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With the growing demands of human beings, sanitary landfill, along with the increase in landfill depth and leachate water pressure, has put forward new and higher requirements for the impermeable layer. In particular, it is required to have a certain adsorption capacity of harmful substances from the perspective of environmental protection. Hence, the impermeability of polymer bentonite–sand mixtures (PBTS) at different water pressure and the adsorption properties of polymer bentonite (PBT) on contaminants were investigated through the modification of PBT using betaine compounded with sodium polyacrylate (SPA). It was found that the composite modification of betaine and SPA could reduce the average particle size of PBT dispersed in water (reduced to 106 nm from 201 nm) and enhance the swelling properties. As the content of SPA increased, the hydraulic conductivity of PBTS system decreases and the permeability resistance improves, while the resistance to external water pressure increases. It is proposed a concept of the potential of osmotic pressure in a constrained space to explain the impermeability mechanism of PBTS. The potential of osmotic pressure obtained by linear extrapolation of the trendline of colloidal osmotic pressure versus mass content of PBT could represent the external water pressure that the PBT resist. Additionally, the PBT also has a high adsorption capacity for both organic pollutants and heavy metal ions. The adsorption rate of PBT was up to 99.36% for phenol; up to 99.9% for methylene blue; and 99.89%, 99.9%, and 95.7% for low concentrations of Pb2+, Cd2+, and Hg+, respectively. This work is expected to provide strong technical support for the future development in the field of impermeability and removal of hazardous substances (organic and heavy metals).

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Nonlinear sorption of phenols and anilines by organobentonites: Nonlinear partition and space limitation for partitioning

Cited by 11 publications

References 47 publications

Linear adsorption of organic compounds on mesoporous activated carbon in bi-solute system

Linear adsorption of organic compounds on mesoporous activated carbon in bi-solute system

Co-Transport of Aniline and TNT with Loess Colloid Particles in Saturated Loess Columns: Mechanism and Processes

A Study on the Impermeability of Nanodispersible Modified Bentonite Based on Colloidal Osmotic Pressure Mechanisms and the Adsorption of Harmful Substances

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