Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite

Arancibia‐Miranda, Nicolás; Silva-Yumi, Jorge; Escudey, Mauricio

doi:10.1016/j.jhazmat.2015.08.007

Cited by 46 publications

(43 citation statements)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Elovich equation has been widely applied to describe second-order kinetics when chemisorption of different analytes appeared on solids with energetically heterogeneous reactive sites (Arancibia-Miranda et al 2015). The intial rate constants (a) increased with the increase of charring temperature, which was similar to the previously description by the pseudo-second-order model.…”

Section: Fig 1 Sorption Kinetics Of Nor Onto 5 Biocharssupporting

confidence: 67%

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Feng¹,

Yu²,

Deng³

et al. 2015

BioResources

View full text Add to dashboard Cite

Biochars (BC) generated from biomass residues have been recognized as effective sorbents for organic compounds. In this study, biochars as adsorbents for the removal of norfloxacin (NOR) from aqueous solutions were evaluated. Biochars were prepared from cassava dregs at 350 °C, 450 °C, 550 °C, 650 °C, and 750 °C, respectively (labeled as BC350, BC450, BC550, BC650, and BC750). The results showed that the kinetic data were best fitted to the pseudo second-order model, indicating that the sorption was governed by the availability of sorption sites on the biochar surfaces rather than the NOR concentration in the solution. Sorption isotherms of NOR were well described by the Freundlich model, and the Freundlich coefficients (lgkF) increased with the pyrolysis temperature of biochars. Thermodynamic analysis indicated the feasibility and spontaneity of the NOR adsorption process. The NOR adsorption on BC450, BC550, BC650, and BC750 was an endothermic process, while an exothermic process occurred for BC350. FTIR studies further suggested that the adsorption mechanism was possibly attributable to H-bond and π-π interactions between NOR and biochars. Overall, this work constitutes a basis for further research considering the bioavailability and toxicity of antibiotics in the presence of biochar.

show abstract

Section: Fig 1 Sorption Kinetics Of Nor Onto 5 Biocharssupporting

confidence: 67%

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Feng¹,

Yu²,

Deng³

et al. 2015

BioResources

View full text Add to dashboard Cite

show abstract

“…For each increase of 1 unit in the C/N ratio, the ECEC and the CEC increased 0.082 and 0.299 %, respectively and for every increase in 1 % of TOC, the C/N ratio increased 8:1. As C/N ratio of the SOM increases more carboxylic than phenolic SFG are present in the humic substances and biomolecules (Sposito, 2008) with smaller pH PZC and higher CEC (Rovira et al, 2008;Arancibia-Miranda et al, 2015). Otherwise, soils with lower organic carbon content usually have lower C/N ratios due to the intense mineralization of humic substances and increasing predominance of humin fraction with aromatic rings and higher pH PZC (Stevenson, 1994;Sposito, 2008).…”

Section: Cec and The C/n Ratio Of The Sommentioning

confidence: 99%

“…and aluminol(Arancibia-Miranda et al, 2015) SFG ŷ = 953.45x -0.824 , R 2 = 0.69 ŷ = 4.11 cmol c kg -1 , n.s. Cation exchange capacity (2CEC ICF ) and effective cation exchange capacity (2ECEC ICF ) of the inorganic clay fraction regarding the percentage of clay size fraction content for the soil samples.…”

mentioning

confidence: 96%

Contribution of the chemical and mineralogical properties of sandy-loam tropical soils to the cation exchange capacity

Costa¹,

Souza²,

Canton³

et al. 2020

Revista Brasileira De Ciência Do Solo

View full text Add to dashboard Cite

Soils originating from the Caiuá sandstone formation have low soil organic matter (SOM), clay content, and cation exchange capacity (CEC). The predominance of one component over the other might decisively influence the CEC of these soils. Particle size distribution and selective dissolution procedures associated to a suit of methods to determine the exchangeable capacity properties might clarify the relative importance of each soil component. The objective of this work was to evaluate the contribution of the different components of the solid fraction and their intrinsic attributes to the CEC of sandy-loam soils and their relation to the total organic carbon (TOC), C:N ratio, and soil mineralogy. For this purpose, 34 soil samples were selected from the Caiuá sandstone formation with significant variation in the carbon content. Clay size fraction was characterized by X-ray diffraction, routine chemical analysis, and total specific surface area-SSA T using EGME, before and after the removal of SOM with sodium hypochlorite solution. Different values of CEC and effective cation exchange capacity (ECEC) were determined following standard procedures. The soils presented high sand content (82.9 ± 5.9 %) and the mineralogy of the clay fraction is dominated by kaolinite (>80 %) with the presence of illite, 2:1 clay minerals, and small amounts of iron and aluminum oxides. The CEC and ECEC values at pH 7.0 and ~5.6, respectively due to the SOM are 408.6 and 148.7 cmol c kg-1 of carbon, respectively. The SOM was responsible for 32 to 84 % (average 52 %) and 24 to 67 % (average of 46 %) of the CEC and ECEC of the soils, respectively. The CEC and ECEC of the inorganic fraction are 2.32 and 0.78 cmol c kg-1 of minerals, respectively. The CEC of the clay fraction increased with the TOC but decreased exponentially with the clay content. The total carbon content increased linearly with the C/N ratio. The SSA T showed a significant (p<0.05) and positive correlation with the TOC and with the CEC of the soils.

show abstract

“…The chemical versatility of INT paves the way towards possible applications in various fields, such as stimuli-responsive materials 20 , molecular storage 21 , 30 , molecular recognition and separation 5 , 31 , water filtration and decontamination 22 , 32 as well as catalysis 33 and photocatalysis 34 . Furthermore, INTs are invoked in a geological context when evaluating carbon storage, metallic cations or radionuclides storage in soils 35 – 37 , as well as markers in the evolution of the Martian climate 38 .…”

Section: Introductionmentioning

confidence: 99%

Structural resolution of inorganic nanotubes with complex stoichiometry

et al. 2018

View full text Add to dashboard Cite

Determination of the atomic structure of inorganic single-walled nanotubes with complex stoichiometry remains elusive due to the too many atomic coordinates to be fitted with respect to X-ray diffractograms inherently exhibiting rather broad features. Here we introduce a methodology to reduce the number of fitted variables and enable resolution of the atomic structure for inorganic nanotubes with complex stoichiometry. We apply it to recently synthesized methylated aluminosilicate and aluminogermanate imogolite nanotubes of nominal composition (OH)3Al2O3Si(Ge)CH3. Fitting of X-ray scattering diagrams, supported by Density Functional Theory simulations, reveals an unexpected rolling mode for these systems. The transferability of the approach opens up for improved understanding of structure–property relationships of inorganic nanotubes to the benefit of fundamental and applicative research in these systems.

show abstract

Effect of cations in the background electrolyte on the adsorption kinetics of copper and cadmium and the isoelectric point of imogolite

Cited by 46 publications

References 60 publications

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Adsorption Characteristics of Norfloxacin by Biochar Prepared by Cassava Dreg: Kinetics, Isotherms, and Thermodynamic Analysis

Contribution of the chemical and mineralogical properties of sandy-loam tropical soils to the cation exchange capacity

Structural resolution of inorganic nanotubes with complex stoichiometry

Contact Info

Product

Resources

About