Specific Adsorption of Anions

Hingston, F. J.; Atkinson, Roger; Posner, A. M.; Quirk, J. P.

doi:10.1038/2151459a0

Cited by 426 publications

(199 citation statements)

References 5 publications

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“…Nonspecific adsorption involves the coulombic forces, and is mainly limited to pH-dependent sites below pH ZPC (the pH value at which surface charge is zero) of the adsorbent (Hingston et al, 1967). The specific adsorption, however, involves ligand exchange reactions where the anions displace OH À and/or H 2 O from the surface (Prasad, 1994).…”

Section: Adsorption Mechanismsmentioning

confidence: 99%

Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

2003

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Section: Adsorption Mechanismsmentioning

confidence: 99%

Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

2003

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“…Our resuits are in accord with those of McBride and Kung (1989) who reported that glyphosate was completely displaced from an amorphous iron oxide by phosphate. Hingston et al (1968) studied the competition between specifically adsorbed anions and found that "anions are desorbed by competitors only when the competitors can occupy sites in addition to those already occupied by the anion and hence increase the negative charge in the surface". This explanation may account for the capacity of phosphate to desorb glyphosate.…”

Section: Competition Between Glyphosate and Phosphatementioning

confidence: 99%

Effect of KCl and CaCl₂ as Background Electrolytes on the Competitive Adsorption of Glyphosate and Phosphate on Goethite

Gimsing

Borggaard

2001

Clays and clay miner.

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Abstract--Competitive adsorption between glyphosate and phosphate on goethite was evaluated. The influence of background electrolyte on the adsorption of glyphosate and phosphate was also investigated by using 0.01 M KC1, 0.1 M KC1 and 0.01 M CaCI 2 as background electrolytes. Experiments showed that phosphate displaced adsorbed glyphosate from goethite, whereas glyphosate did not displace phosphate. Results also showed that the background electrolyte had a strong effect on phosphate adsorption, but little effect on glyphosate adsorption. Thus, there are differences between the adsorption of glyphosate and phosphate. The study also showed that 0.01 M KCI caused dispersion of goethite, resulting in inefficient filtering, and that phosphate precipitated as calcium phosphates in 0.01 M CaC12 background electrolyte solutions. The results suggest that 0.1 M KC1 is a more suitable background electrolyte to determine competitive adsorption processes involving glyphosate and phosphate.

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“…For pure water, the most important ions are hydroxide and hydronium ions, and their effect on metal oxides, including TiO 2 [106] and Fe 2 O 3 [107,108] gives rise to the well-known 59 mV pH À1 variation of the flatband potential with the solution pH [109]. In surface water, phosphate, silicate, and fluoride ions are often strongly adsorbing [110], which determines the redox stability of many minerals [109]. In contrast, the flatband potentials of II/VI, III/V, and group IV semiconductors are more susceptible to adsorption of soft ligands, including sulfur [111], HS À [112,113], HTe À [114,115], and Cl À [116].…”

Section: Multiple Exciton Generationmentioning

confidence: 99%

Nanoscale Effects in Water Splitting Photocatalysis

Osterloh

2015

Topics in Current Chemistry

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From a conceptual standpoint, the water photoelectrolysis reaction is the simplest way to convert solar energy into fuel. It is widely believed that nanostructured photocatalysts can improve the efficiency of the process and lower the costs. Indeed, nanostructured light absorbers have several advantages over traditional materials. This includes shorter charge transport pathways and larger redox active surface areas. It is also possible to adjust the energetics of small particles via the quantum size effect or with adsorbed ions. At the same time, nanostructured absorbers have significant disadvantages over conventional ones. The larger surface area promotes defect recombination and reduces the photovoltage that can be drawn from the absorber. The smaller size of the particles also makes electron-hole separation more difficult to achieve. This chapter discusses these issues using selected examples from the literature and from the laboratory of the author.

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Specific Adsorption of Anions

Cited by 426 publications

References 5 publications

Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

Effect of KCl and CaCl₂ as Background Electrolytes on the Competitive Adsorption of Glyphosate and Phosphate on Goethite

Nanoscale Effects in Water Splitting Photocatalysis

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Specific Adsorption of Anions

Cited by 426 publications

References 5 publications

Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

Arsenic(V) removal with a Ce(IV)-doped iron oxide adsorbent

Effect of KCl and CaCl2 as Background Electrolytes on the Competitive Adsorption of Glyphosate and Phosphate on Goethite

Nanoscale Effects in Water Splitting Photocatalysis

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Effect of KCl and CaCl₂ as Background Electrolytes on the Competitive Adsorption of Glyphosate and Phosphate on Goethite