Retracted Article: Enhanced adsorption of Eu(iii) on mesoporous Al2O3/expanded graphite composites investigated by macroscopic and microscopic techniques

2012 ◽  
Vol 41 (43) ◽  
pp. 13388-13394 ◽  
Author(s):  
Yubing Sun ◽  
Changlun Chen ◽  
Xiaoli Tan ◽  
Dadong Shao ◽  
Jiaxing Li ◽  
...  
Keyword(s):  
Adsorption Mechanism ◽  
Surface Complexation ◽  
Expanded Graphite ◽  
Outer Sphere ◽  
Sphere Surface ◽  
Inner Sphere ◽  
Retracted Article ◽  
Enhanced Adsorption ◽  
Graphite Composites ◽  
Microscopic Techniques

The adsorption mechanism between Eu(iii) and mesoporous Al2O3/EG composites shifts from outer-sphere to inner-sphere surface complexation with increasing pH.

scholarly journals Retraction: Enhanced adsorption of Eu(iii) on mesoporous Al2O3/expanded graphite composites investigated by macroscopic and microscopic techniques

2020 ◽  
Vol 49 (17) ◽  
pp. 5742-5742
Author(s):  
Yubing Sun ◽  
Changlun Chen ◽  
Xiaoli Tan ◽  
Dadong Shao ◽  
Jiaxing Li ◽  
...  
Keyword(s):  
Expanded Graphite ◽  
Dalton Trans ◽  
Enhanced Adsorption ◽  
Graphite Composites ◽  
Microscopic Techniques

Retraction of ‘Enhanced adsorption of Eu(iii) on mesoporous Al2O3/expanded graphite composites investigated by macroscopic and microscopic techniques’ by Yubing Sun et al., Dalton Trans., 2012, 41, 13388–13394.

Surface complexation modelling of uranyl adsorption onto kaolinite based clay minerals using FITEQL 3.2

2006 ◽  
Vol 94 (12) ◽  
Author(s):  
Deniz Arda ◽  
Julide Hizal ◽  
Resat Apak
Keyword(s):  
Clay Minerals ◽  
Surface Complexation ◽  
Outer Sphere ◽  
Uranyl Ion ◽  
Sphere Surface ◽  
Hexavalent Uranium ◽  
Inner Sphere

The aim of this study is to explain how the kaolinite-based clay minerals adsorb hexavalent uranium (uranyl ion), and to model uranyl adsorption based on inner-sphere surface complexation with the kaolinite edge hydroxyl sites and outer-sphere complexation with the permanent charge sites. The adsorption of UO

scholarly journals Waste Brick Dust as Potential Sorbent of Lead and Cesium from Contaminated Water

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1647 ◽  
Author(s):  
Barbora Doušová ◽  
David Koloušek ◽  
Miloslav Lhotka ◽  
Martin Keppert ◽  
Martina Urbanová ◽  
...  
Keyword(s):  
Amorphous Material ◽  
Surface Complexation ◽  
Total Pore Volume ◽  
Zero Point ◽  
Outer Sphere ◽  
Aqueous System ◽  
Sphere Surface ◽  
Adsorption Condition ◽  
Weak Adsorption ◽  
Brick Dust

Adsorption properties of waste brick dust (WBD) were studied by the removing of PbII and CsI from an aqueous system. For adsorption experiments, 0.1 M and 0.5 M aqueous solutions of Cs+ and Pb2+ and two WBD (Libochovice—LB, and Tyn nad Vltavou—TN) in the fraction below 125 µm were used. The structural and surface properties of WBD were characterized by X-ray diffraction (XRD) in combination with solid-state nuclear magnetic resonance (NMR), supplemented by scanning electron microscopy (SEM), specific surface area (SBET), total pore volume and zero point of charge (pHZPC). LB was a more amorphous material showing a better adsorption condition than that of TN. The adsorption process indicated better results for Pb2+, due to the inner-sphere surface complexation in all Pb2+ systems, supported by the formation of insoluble Pb(OH)2 precipitation on the sorbent surface. A weak adsorption of Cs+ on WBD corresponded to the non-Langmuir adsorption run followed by the outer-sphere surface complexation. The leachability of Pb2+ from saturated WBDs varied from 0.001% to 0.3%, while in the case of Cs+, 4% to 12% of the initial amount was leached. Both LB and TN met the standards for PbII adsorption, yet completely failed for any CsI removal from water systems.

Removal of Pb(ii) by nano-titanium oxide investigated by batch, XPS and model techniques

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88520-88528 ◽  
Author(s):  
Zhongxiu Jin ◽  
Huiyi Gao ◽  
Linhua Hu
Keyword(s):  
Ion Exchange ◽  
Titanium Oxide ◽  
Surface Complexation ◽  
Sphere Surface ◽  
Adsorption Mechanisms ◽  
Inner Sphere

The ion exchange and inner-sphere surface complexation were inferred as the adsorption mechanisms of Pb(ii) on nano-TiO2.

scholarly journals Iron-incorporated mesoporous silica for enhanced adsorption of tetracycline in aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42407-42413 ◽  
Author(s):  
Ziyang Zhang ◽  
Huachun Lan ◽  
Huijuan Liu ◽  
Haiyan Li ◽  
Jiuhui Qu
Keyword(s):  
Aqueous Solution ◽  
Mesoporous Silica ◽  
Sphere Surface ◽  
Surface Complexes ◽  
Inner Sphere ◽  
Enhanced Adsorption

The iron-incorporated influenced the adsorption of TC greatly and inner-sphere surface complexes formed between TC and the Fe(iii) on the adsorbent.

scholarly journals Antimony (V) Adsorption at the Hematite–Water Interface: A Macroscopic and In Situ ATR-FTIR Study

Soil Systems ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 20
Author(s):  
Jerzy Mierzwa ◽  
Rose Mumbi ◽  
Avedananda Ray ◽  
Sudipta Rakshit ◽  
Michael E. Essington ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Adsorption Mechanism ◽  
Surface Complexation ◽  
Outer Sphere ◽  
Surface Complexation Modeling ◽  
Surface Complexes ◽  
Ph Values ◽  
Oxide Minerals ◽  
Complexation Mechanism

The environmental mobility of antimony (Sb) is largely unexplored in geochemical environments. Iron oxide minerals are considered major sinks for Sb. Among the different oxidation states of Sb, (+) V is found more commonly in a wide redox range. Despite many adsorption studies of Sb (V) with various iron oxide minerals, detailed research on the adsorption mechanism of Sb (V) on hematite using macroscopic, spectroscopic, and surface complexation modeling is rare. Thus, the main objective of our study is to evaluate the surface complexation mechanism of Sb (V) on hematite under a range of solution properties using macroscopic, in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopic, and surface complexation modeling. The results indicate that the Sb (V) adsorption on hematite was highest at pH 4–6. After pH 6, the adsorption decreased sharply and became negligible above pH 9. The effect of ionic strength was negligible from pH 4 to 6. The spectroscopic results confirmed the presence of inner- and outer-sphere surface complexes at lower pH values, and only outer-sphere-type surface complex at pH 8. Surface complexation models successfully predicted the Sb (V) adsorption envelope. Our research will improve the understanding of Sb (V) mobility in iron-oxide-rich environments.

Protonation effects on dynamic flux properties of aqueous metal complexes

2009 ◽  
Vol 74 (10) ◽  
pp. 1543-1557 ◽  
Author(s):  
Herman P. Van Leeuwen ◽  
Raewyn M. Town
Keyword(s):  
Complex Formation ◽  
Metal Ion ◽  
Good Description ◽  
Minor Component ◽  
Outer Sphere ◽  
Metal Species ◽  
Central Metal ◽  
Inner Sphere ◽  
A Minor ◽  
Protonated Ligand

The degree of (de)protonation of aqueous metal species has significant consequences for the kinetics of complex formation/dissociation. All protonated forms of both the ligand and the hydrated central metal ion contribute to the rate of complex formation to an extent weighted by the pertaining outer-sphere stabilities. Likewise, the lifetime of the uncomplexed metal is determined by all the various protonated ligand species. Therefore, the interfacial reaction layer thickness, μ, and the ensuing kinetic flux, Jkin, are more involved than in the conventional case. All inner-sphere complexes contribute to the overall rate of dissociation, as weighted by their respective rate constants for dissociation, kd. The presence of inner-sphere deprotonated H2O, or of outer-sphere protonated ligand, generally has a great impact on kd of the inner-sphere complex. Consequently, the overall flux can be dominated by a species that is a minor component of the bulk speciation. The concepts are shown to provide a good description of experimental stripping chronopotentiometric data for several protonated metal–ligand systems.

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