Batch Adsorption and Column Leaching Studies of Aniline in Chinese Loess Under Different Hydrochemical Conditions

Zhou, Bo; Zhang, Zehong; Wang, Sichang; Wu, Yaoguo; Hu, Shixue; Sun, Ran

doi:10.1007/s00128-020-02830-z

Cited by 12 publications

(5 citation statements)

References 34 publications

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“…Characterization of the studied Chinese loess (Tables 1, 2 and 3) was reported by Zhou et al (2020). Most of its physical-chemical properties, including chemical constituents, speci c surface area, pH and Zeta potential, are echoed with those documented for those reported loess by Tang et al(2009) and Xie et al(2017).…”

Section: Characterization Of Chinese Loessmentioning

confidence: 90%

Batch and column tests study on coexistence of TNT and aniline enhancing their Transports in Chinese loess

Zhou

et al. 2023

Preprint

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Batch adsorption and column tests were conducted to explore characteristics of transports of TNT and aniline and their interactions in saturated Chinese loess sampled from Xi’an, China. Batch tests show that the performances of TNT and aniline adsorptions on Chinese loess are not same when they exist alone. When they coexist, their adsorptions inhibit each other and their inhibitions potentials were different. TNT inhibition on aniline adsorption is in linear and increases with TNT concentration increasing, while aniline inhibition on TNT adsorption also depends on its concentration but in two stages, where the inhibition is few when aniline concentration is lower than 5 mg/L, and then also gets linear increasing with aniline concentration increasing over 5 mg/L. Even though, the inhibition of aniline on TNT adsorption is generally greater than that of TNT on aniline adsorption. Column tests show that, compared with the transport behavior when they exist alone, theier coexistence can promote each other to transport in the saturated loess, importantly, aniline promotes more obviously TNT transport than TNT promotes aniline transport. Kinetics, isotherms and thermodynamics studies indicat that, TNT adsorption is primarily through the surface adsorption while aniline adsorption is mainly via electrostatic adsorption and inner pore diffusion adsorption as well as surface adsorption. There is a certain competitive relationship in their adsorptions on Chinese loess because they have same adsorption sites, meanwhile, they have different adsorption sites, especially, electrostatic force is greater than surface force, when they coexist. So, these inhibitions on adsorption are conducive to the existences of TNT and aniline in the water solution rather than being fixed on Chinese loess, thus enhancing their transports in the saturated loess and aniline has a great effect on TNT migration, while TNT has a small effect on aniline transport, indicating their coexistence can increase the risk of deep soil and even groundwater pollution.

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Section: Characterization Of Chinese Loessmentioning

confidence: 90%

Batch and column tests study on coexistence of TNT and aniline enhancing their Transports in Chinese loess

Zhou

et al. 2023

Preprint

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“…C 1 is the concentration of organic compound in particle adsorption state; C is the total organic compound concentration in untreated effluent samples; C 2 is the concentration of soluble organic compound in solution, where C 2 refers to the concentration of organic compound in effluent after centrifugal treatment of 15 min and passing through a 0.22 µm filter membrane; the treatment method is as per reference [40].…”

Section: Methods For the Analysis Of Leachatementioning

confidence: 99%

“…The adsorption kinetics curves of aniline and TNT on loess colloid particles are described in Figure 2. As the adsorption time increased, both organic compounds exhibited the trend of "an initial rapid increase in adsorption, followed by stabilization at adsorption equilibrium" [40]. Adsorption processes of aniline and TNT reached equilibrium at 120 min and 8 h, respectively.…”

Section: Adsorption Kineticsmentioning

confidence: 98%

“…Water 2024, 16, x FOR PEER REVIEW 4 of 14 soluble organic compound in solution, where C2 refers to the concentration of organic compound in effluent after centrifugal treatment of 15 min and passing through a 0.22 μm filter membrane; the treatment method is as per reference [40].…”

Section: Basic Properties Of Loess Colloid Particlesmentioning

confidence: 99%

“…(3) Electrostatic interaction mainly existed between loess colloid particles and organic compound containing polar functional groups [57]. -NH 2 in aniline could be partially protonated (H + + Ph-NH 2 → Ph-NH 3 + ) [40,62], and -NH 3 + was adsorbed by electrostatic interaction to neutralize the negative charge of loess colloid particles. A recent study found the same electrostatic interaction of aniline [63].…”

Section: The Proposed Adsorption Mechanismmentioning

confidence: 99%

See 2 more Smart Citations

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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Adsorptive Removal of Low-Concentration Cr(VI) in Aqueous Solution by Mg–Al Layered Double Oxides

Fan

Zhou

Zhang

et al. 2021

Bull Environ Contam Toxicol

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Batch Adsorption and Column Leaching Studies of Aniline in Chinese Loess Under Different Hydrochemical Conditions

Cited by 12 publications

References 34 publications

Batch and column tests study on coexistence of TNT and aniline enhancing their Transports in Chinese loess

Batch and column tests study on coexistence of TNT and aniline enhancing their Transports in Chinese loess

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

Adsorptive Removal of Low-Concentration Cr(VI) in Aqueous Solution by Mg–Al Layered Double Oxides

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