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Doula, M.; Ioannou, A.; Dimirkou, A.

doi:10.1023/a:1026513032260

Cited by 57 publications

(25 citation statements)

References 15 publications

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“…The contact between solid phase and the species present in solution can occur under conditions of equilibrium or not and, 51 in both cases, adsorption reactions can be described mathematically by the Gibbs free energy variation: 23,[33][34][35] (9) where G is the variation of the free energy (J mol -1 ); R is the universal constant of the gases, 8.314 J mol…”

Section: Thermodynamic Parameters Of Cu Adsorption Reactionmentioning

confidence: 99%

“…Hydrolyzed species are preferentially adsorbed and thus the first hydrolysis product, MOH + , is usually in the predominant concentration. 23,64 However, Rodda et al 20 concluded that the dimer species [Cu 2 (OH) 2 2+ ] were the main hydrolysis product in the pH interval where accelerated adsorption occurred.…”

Section: Adsorption Envelopes: the Influence Of Soil Ph On Cu Adsorptionmentioning

confidence: 99%

“…23,61 It is a slow reversibility reaction under natural conditions, since it is a process that involves much energy because of the partially covalent links (inner-sphere) with the structural metal cations of the surface. 49 The thermodynamic approach of a system, whether in equilibrium or not, requires that the transformations it undergoes be mediated by reversible processes.…”

Section: Thermodynamic Approach Of Cu Adsorption Reaction Theoreticalmentioning

confidence: 99%

“…12 Organic complexes are particularly important in Cu retention by the soil under a wide variety of conditions, [13][14][15][16] that influence the adsorption 7 and desorption of the metal. 17 Copper adsorption was studied in pure systems, such as Fe and Al (oxy)hydroxides (hematite and goethite) [18][19][20] and clay minerals (kaolinite, illite etc), [21][22][23] and in complex systems such as soil, under natural, agricultural or waste application conditions. 7,[24][25][26] Metal adsorption by soil (oxy) hydroxides has been identified as the main mechanism by which the metals are retained by the inorganic constituents of weathered soils.…”

Section: Introductionmentioning

confidence: 99%

“…24,30,31 However, the adsorption modeling in tropical soils is rarely accompanied by a more detailed description based on thermodynamics. 23,[32][33][34][35] Some information on thermodynamic modeling was obtained for the adsorption reaction of some metal ions by homogeneous surfaces, such as the oxidic interfaces, 20,[36][37][38] but data on thermodynamics of the Cu adsorption reaction by soils are still limited. As the metal distribution between liquid and solid phases is a measure of the position of equilibrium in the adsorption process, the states of this system can be defined by a set of thermodynamic properties that can serve as measures of the extension and spontaneity of the adsorption reaction.…”

Section: Introductionmentioning

confidence: 99%

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Copper adsorption as a function of solution parameters of variable charge soils

Mouta¹,

Soares²,

Casagrande³

2008

J. Braz. Chem. Soc.

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Os efeitos do pH e da força iônica (I) sobre a adsorção de cobre (Cu) e a força direcional da reação em solos com cargas variáveis foram avaliados a partir de experimentos tipo "batch". Os resultados foram ajustados pelo modelo de Langmuir e, de acordo com as isotermas de adsorção, a afinidade de Cu (K L ) foi maior nas amostras do subsolo (0,061-0,468 L kg -1 ) do que na camada superficial (0,169-0,359 L kg -1 ). A adsorção máxima variou de 1114-2422 mg kg -1 (superfície) a 1002-1334 mg kg -1 (subsolo). Foi observada forte dependência da adsorção de Cu em relação ao pH nas amostras do subsolo, com nítido aumento da retenção de Cu (20-90%) no intervalo de pH do solo entre 4,0-5,0. A adsorção de Cu foi alterada pelo aumento da I e indicou diferentes mecanismos (esferas interna e externa) de retenção do metal. A reação foi favorável e espontânea, conforme indicado pelos valores negativos da variação da energia livre ( G) e pelo fator de separação K R < 1. A interface solo-solução e a adsorção de Cu foram termodinamicamente descritas por uma abordagem teórica. Adsorption reaction was favorable and spontaneous, as indicated by negative values of the free energy variation ( G) and the separation factor K R < 1. Soil-solution interface and Cu adsorption were also thermodynamically described by a theoretical approach. Effects of pH and ionic strength (I) on copper (Cu

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Section: Thermodynamic Parameters Of Cu Adsorption Reactionmentioning

confidence: 99%

Section: Adsorption Envelopes: the Influence Of Soil Ph On Cu Adsorptionmentioning

confidence: 99%

Section: Thermodynamic Approach Of Cu Adsorption Reaction Theoreticalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Copper adsorption as a function of solution parameters of variable charge soils

Mouta¹,

Soares²,

Casagrande³

2008

J. Braz. Chem. Soc.

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Characteristics and mechanisms of arsenate adsorption onto manganese oxide‐doped aluminum oxide

Liu

Xue

et al. 2015

Env Prog and Sustain Energy

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This study focused on the characteristics and mechanisms of arsenate [As(V)] adsorption onto manganese oxide‐doped aluminum oxide. The adsorbent surface was characterized via the Brunauer–Emmett–Teller method, scanning electron microscopy, energy‐dispersive spectroscopy, and X‐ray diffraction. The characterization results indicated a rough and Al‐enriched surface, a surface area of 91.2 m2/g, and an amorphous structure for manganese oxide‐doped aluminum oxide. Most of the As(V) was adsorbed within 1.5 h, and the kinetics data were described well by the pseudo‐second‐order model. Meanwhile, the adsorption process was controlled by more than one rate‐limiting step. The Langmuir model fitted the isotherm data better compared with the Freundlich model, and the maximum adsorption amount was 114.5 mg/g at T = 298 K. The As(V) adsorption was an endothermic and spontaneous process. The optimal As(V) removal was achieved at a pH range of 4.0–6.0. Furthermore, the results of Fourier transform infrared spectroscopy and X‐ray photoemission spectroscopy suggested that As(V) adsorption was primarily through the adhesion to the surface hydroxyl groups and ligand exchange with the sulfate. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1009–1018, 2015

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