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Draoui, Khalid; Denoyel, Renaud; Chgoura, M.; Rouquérol, J.

doi:10.1023/a:1010152411288

Cited by 31 publications

(6 citation statements)

References 15 publications

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“…Clays, efficient natural adsorbents, are the main components of soils and possess a negative charge that is compensated for by exchange cations, on their surfaces, such as Na + and Ca +2 [8]. The cation exchange capacity (CEC) and the nature of the compensating cations play major roles in the interactions of organic compounds with the solid surfaces of clays [9,10]. Modification of clay minerals by ion exchange with organic cations has been shown to have a significant impact on their sorptivity [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…Natural and modified clays that have an expandable layered structure are among the sorbents attracting more recent interest [13,14]. There is much literature about adsorption of paraquat by clays, such as [5,10,15,16], about activated clays [17] and surfactant/bentonite systems [18]. However, there is no literature about Turkish clays and treated clays.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Paraquat adsorption onto clays and organoclays from aqueous solution

Seki

Yurdakoç

2005

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Paraquat adsorption onto clays and organoclays from aqueous solution

Seki

Yurdakoç

2005

Journal of Colloid and Interface Science

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“…For example, in an early study by Brownawell et al, the adsorption of the cationic surfactant dodecylpyridinium (DP) to kaolinite clay under varied solution conditions (pH, background electrolyte and dodecylpyridinium concentration) was found to be directly proportional to solution pH [5]. A similar observation was made in studies of paraquat [22] and methylene blue [23] dye sorption onto kaolinite.…”

Section: Ph Effectsmentioning

confidence: 65%

“…Thus, cation sorption is expected to occur and increase with initial solution pH for values in excess of the PZC. This has been observed in numerous studies of cation absorption to kaolinite [5,22,23]. For example, in an early study by Brownawell et al, the adsorption of the cationic surfactant dodecylpyridinium (DP) to kaolinite clay under varied solution conditions (pH, background electrolyte and dodecylpyridinium concentration) was found to be directly proportional to solution pH [5].…”

Section: Ph Effectsmentioning

confidence: 78%

Sorption of Denatonium to Kaolinite Clay from Water

Crosson¹,

Thorpe²,

Zhou³

et al. 2013

JEP

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Denatonium benzoate is an aversive agent proposed for use in certain anti-freeze formulations to reduce poisoning events of pets and humans. Unfortunately, the sorption properties of denatonium cations to soil and/or soil components have not been investigated. In this paper, denatonium sorption to reference kaolinite clay under varied pH, ionic strength, and cation identity is described. The data clearly indicate that the nature of the background electrolyte cation modulates denatonium sorption with enhanced sorption occurring the presence of potassium ions versus minimal sorption occurring in a calcium chloride electrolyte at each pH studied as estimated using Dubinin-Raduskevich (D-R) isotherms. The effect of background electrolyte concentration on sorption was consistent with an ion-exchange process wherein the sorption capacity increased with decreased background electrolyte concentration. An interesting and unexpected observation of increased sorption capacity (estimated using the D-R model) with decreasing pH was observed in 10 mM CaCl 2 in contrast to an observed and expected increase in denatonium sorption to kaolinite in the presence of either of 10 mM NaCl or 10 mM KCl. Estimates of the mean sorption energy using D-R isotherms ranging from 2.65 kJ/mol in 10 mM CaCl 2 at pH 4 to 4.68 kJ/mol at pH 10 suggesting that the sorption process is not exclusively ion-exchange.

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“…The paraquat adsorption onto the clay surface was an exothermic and a spontaneous process. The maximum value of the equilibrium amount of adsorbed paraquat on the nanoceramic at pH 11 at 65.8 μmol/g was slightly lower than the illite (72.3 μmol/g) and clay mineral (73.1 μmol/g) at the same pH [ 19 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

Biodegradation Capabilities of Paraquat-Degrading Bacteria Immobilized on Nanoceramics

Jindakaraked

Khan

Kajitvichyanukul

2023

Toxics

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The biodegradation of paraquat was investigated using immobilized microbial cells on nanoceramics fabricated from nanoscale kaolinite. Pseudomonas putida and Bacillus subtilis, which degrade paraquat, were immobilized separately on nanoceramics (respectively called ICnc−P and ICnc−B). The attachment of bacteria to nanoceramics resulted from electrostatic force interactions, hydrogen bonding, and covalent bonding (between the cells and the support materials). The initial 10 mg L−1 concentration of paraquat in water was removed by the adsorption process using nanoceramics at 68% and ceramics at 52%, respectively. The immobilized cells on the nanoceramics were able to remove approximately 92% of the paraquat within 10 h, whereas the free cells could only remove 4%. When the paraquat was removed, the cell−immobilized nanoceramics exhibited a significant decrease in dissolved organic nitrogen (DON). ICnc−B was responsible for 34% of DON biodegradation, while ICnc−P was responsible for 22%. Ammonia was identified as the end product of ammonification resulting from paraquat mineralization.

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Untitled

Cited by 31 publications

References 15 publications

Paraquat adsorption onto clays and organoclays from aqueous solution

Paraquat adsorption onto clays and organoclays from aqueous solution

Sorption of Denatonium to Kaolinite Clay from Water

Biodegradation Capabilities of Paraquat-Degrading Bacteria Immobilized on Nanoceramics

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