Comparative modelling of mono- and dinitrophenols sorption on yellow bentonite from aqueous solutions

Yaneva, Zvezdelina; Koumanova, Bogdana

doi:10.1016/j.jcis.2005.06.069

Cited by 60 publications

(52 citation statements)

References 20 publications

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“…A difusão nesses poros é graficamente representada pela relação funcional entre a capacidade de sorção e a raiz quadrada do tempo, isto é, o gráfico de S t versus t 0,5 (Yaneva & Koumanova, 2006); entretanto, as curvas na Figura 4 consistem de dois segmentos lineares, indicando que a difusão ocorre apenas nos macroporos e nos poros de transição sendo que cada difusão é caracterizada por uma taxa definida k i1 e k i2 , respectivamente. Observa-se que, para os macroporos, a taxa é significativamente maior que a dos poros de transição, devido à diminuição do caminho livre disponível para a difusão ou pelo entupimento de poros.…”

Section: Resultsunclassified

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Sorção do Paclobutrazol em dois solos cultivados com manga irrigada

Milfont

Antonino

Martins³

et al. 2007

Agraria

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A cinética e a isoterma de sorção do Paclobutrazol (PBZ) foram determinadas em dois solos com plantio de manga (Mangifera indica L. cv. Tommy Atkins) irrigada, sem histórico de aplicação deste produto, ou seja, um Argissolo Amarelo da estação experimental de Bebedouro, Petrolina, PE, e outro Vertissolo da estação experimental de Mandacaru, Juazeiro, BA, ambas pertencentes à EMBRA-PA Semi-Árido. Os ensaios foram realizados em laboratório a 25°C e a concentração de paclobutrazol determinada por cromatografia líquida de alta eficiência (CLAE). Para esses solos, a cinética de sorção do PBZ foi mais bem descrita com um modelo de segunda ordem e as isotermas de sorção foram lineares. Os valores de K D e K OC foram 8,8 e 7,4 cm 3 g -1 e 1275 (log(Koc) = 3,11) e 1156 (log(Koc) = 3,06) cm 3 .g -1 , respectivamente, para o Argissolo Amarelo e Vertissolo. Para dois solos, a interação do PBZ é preponderantemente com a matéria orgânica embora alguma interação com o óxido de ferro (goethita) ocorra no Argissolo Amarelo.Palavras-chave: regulador de crescimento vegetal, isoterma de adsorção, cinética de adsorção Sorption of Paclobutrazol in two soils of irrigated mango orchards AB S TR ACTThe sorption kinetics and isotherm of Paclobutrazol (PBZ) were determined in two soils from irrigated mango (Mangifera indica L. cv. Tommy Atkins) orchards with no recorded use of PBZ. An Argisol and a Vertisol respectively from Bebedouro and Mandacaru Experimental Stations of the Brazilian Organization for Agriculture and Animal Research (EMBRAPA Semi-Arid) collected in the Municipalities of Petrolina, PE, and Juazeiro, BA were used. The experiments were carried out in laboratory conditions at 25°C and PBZ concentration was determined by high performance liquid chromatography (HPLC). For both soils, the PBZ kinetic sorption was fast and best described by a second order model and the isotherms sorption were linear. The values of K D and K OC were 8.8 and 7.4 cm 3 g -1 and 1275 (log(Koc) = 3.11) and 1156 (log(Koc) = 3.06) cm 3 g -1 , for the Argisol and the Vertisol, respectively. These results show that for both soils, the reactivity of PBZ with organic matter is predominant in determining the sorption, although some interaction of PBZ with iron oxides (goethite) can take place in the Argisol.

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Section: Resultsunclassified

“…A cinética de sorção pode ser representada matematicamente usando-se o seguinte modelo de primeira ordem (Yaneva & Koumanova, 2006):…”

Section: Modelagem Da Sorçãounclassified

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Sorção do Paclobutrazol em dois solos cultivados com manga irrigada

Milfont

Antonino

Martins³

et al. 2007

Agraria

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“…Compared with the other adsorbents reported in the literature such as AP-55 (280 mg/g), granular activated carbon (32.9 mg/g), charcoal activated powder (187.1 mg/g) (Daifullah and Girgis 1998), activated carbon fibers (418.3 mg/g) , carbon nanospheres (32.8 mg/g) (Lazo-Cannata et al 2011), yellow bentonite (9.9 mg/g) (Yaneva and Koumanova 2006), MIP-SiO 2 (15.6 mg/g) (Luo et al 2008), olive wood (5.9 mg/g) (El-Sheikh et al 2013) and cotton cellulose C2 (11.2 mg/g) (Vismara et al 2009), it can be concluded that the two adsorbents can be used to remove 2,4-DNP from aqueous solutions as effectively as the other adsorbents. Further compared with the previously synthesized imidazole-modified silica adsorbents in our group such as SilprImCl (33.3 mg/g), SilprM 1 ImCl (33.9 mg/g), SilprM 2 ImCl (35.9 mg/g), SilprM 4 ImCl (37 mg/g) and SilprM 1 M 2 ImCl (35.3 mg/g) (Wang et al 2013a, b), it is apparent that SilprP 3 NImBr and SilprSP 3 NImBr show adsorption ability superior to the other imidazole-modified silica adsorbents reported in the literature and is more effective for the adsorption of 2,4-DNP, which may be attributed to the additional electrostatic interactions between the amino groups and 2,4-DNP molecules.…”

Section: Comparison With Other Adsorbentsmentioning

confidence: 93%

Preparation of amino functionalized imidazolium-modified silicas by different coupling agents for removal of 2,4-dinitrophenol from aqueous solutions

Wang

2015

Int. J. Environ. Sci. Technol.

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Amino group exhibits alkaline properties. Amino functionalized imidazole-modified silicas would benefit the adsorption of phenolic compounds. Coupling agent between the silica and the imidazolium ring has an effect on adsorption performance. In this paper, two adsorbents were synthesized for the surface bonding of N-(3-aminopropyl)-imidazole onto silicas modified by 3-chloropropyltriethoxysilane and 3-mercaptopropyltrimethoxysilane, respectively. Infrared spectra, elemental analysis, thermogravimetric analysis and N 2 adsorptiondesorption isotherms were used to characterize the two adsorbents, and their adsorption capacities of 2,4-dinitrophenol from aqueous solutions were investigated in detail. The experimental results indicated that amino group plays an important role in the enhancement of adsorption capacities of 2,4-dinitrophenol. The adsorbent with 3-mercaptopropyltrimethoxysilane as coupling agent exhibited lower adsorption capacity due to a weak electron-electron repulsion between the non-bonding electrons of sulfur atom and p electrons of benzene ring of 2,4-dinitrophenol. The adsorption kinetics fitted well with pseudo-second-order model. The two adsorbents could be regenerated and reused eight times at least by washing with HCl. The adsorption mechanism was also discussed.

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“…This rapid process of mass transfer may have occurred because the number of available active sites on the surface of the adsorbent material is more important at the start of the adsorption process than the active sites remaining after one-tenth of the time has passed (Yaneva and Koumanova 2006;Dincer et al 2007;Berez et al 2014;Sadegh et al 2015;Zare et al 2015).…”

Section: Batch Experimentsmentioning

confidence: 99%

Adsorptive removal of azo dyes from aqueous solutions by natural bentonite under static and dynamic flow conditions

Berez

Schäfer

Ayari

et al. 2016

Int. J. Environ. Sci. Technol.

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This work reports new findings on the physisorption of Foron Blue 291 on natural bentonite under both static and dynamic flow conditions of the aqueous solution that may prove important when using the adsorption technique for wastewater treatment. The quantity of dye retained by the solid matrix under both ideal exchange conditions between dyes and adsorbents given in a batch reactor and a pulse injection of dissolved azo dye in a soil column composed of a mixture of mean grain-sized sand and bentonite at different flow rates and at various mass fractions of bentonite was studied. Column experiments involving the use of a non-reactive tracer (Fluorescein) were performed to examine hydrodynamic behaviours of the clay/sand mixture studied. It is shown that advective-dispersive transport across a clay/sand mixture may be characterized by a double porosity medium. The results obtained on the reactive transport of Foron Blue 291 underscore that Foron Blue 291 adsorption depends heavily on the mass fraction of clay in a clay/sand mixture. With a clay mass fraction of 30 %, 77 % of the dissolved Foron Blue 291 mass was irreversibly removed by the adsorbent. At low flow rates, removal ratios obtained from the dynamic reactive system were similar to those obtained through previous static reactor experiments.

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Comparative modelling of mono- and dinitrophenols sorption on yellow bentonite from aqueous solutions

Cited by 60 publications

References 20 publications

Sorção do Paclobutrazol em dois solos cultivados com manga irrigada

Sorção do Paclobutrazol em dois solos cultivados com manga irrigada

Preparation of amino functionalized imidazolium-modified silicas by different coupling agents for removal of 2,4-dinitrophenol from aqueous solutions

Adsorptive removal of azo dyes from aqueous solutions by natural bentonite under static and dynamic flow conditions

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