The pH dependent surface charging and points of zero charge. X. Update

Kosmulski, Marek

doi:10.1016/j.cis.2023.102973

Cited by 14 publications

(2 citation statements)

References 248 publications

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“…From the structure of clay minerals, it can be inferred that the combination of silicon-oxygen sheets makes the structure layers more electronegative. It can be confirmed from the PZCs of kaolinite and montmorillonite (usually <3) [39], which are both higher than gibbsite. This may be one of the reasons for the difference in adsorption behavior of rare earth cations between gibbsite and clay minerals.…”

Section: Comparison With Adsorption Behavior Of Clay Mineralsmentioning

confidence: 74%

Adsorption Behaviors of Lanthanum (III) and Yttrium (III) Ions on Gibbsite

Zhou,

Wan,

et al. 2023

Minerals

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The enrichment process of rare earth elements in ion-adsorbed rare earth ores and bauxite is potentially related to the adsorption of rare earth elements by gibbsite. In this paper, lanthanum and yttrium were selected as surrogates of light rare earth elements and heavy rare earth elements, respectively. The effects of adsorption time, solution pH, and background electrolyte concentration on the adsorption of rare earth ions by gibbsite were investigated through batch adsorption experiments. The results showed that the adsorption of rare earth ions by gibbsite can approach equilibrium in 72 h. There is mainly electrostatic repulsion between gibbsite and rare earth ions at pH 4–7, and the adsorption efficiency increases with the increase in solution pH value and background electrolyte concentration. The adsorption process of rare earth ions by gibbsite is more consistent with the pseudo-second-order kinetic and Langmuir single-layer adsorption models. Moreover, based on the structural correlation between clay minerals and gibbsite, the causes for the differences in the adsorption behaviors of rare earth elements on the minerals are discussed. The results of this study help to understand the role of aluminum hydroxide in the migration and fate of rare earth elements in epigenetic environments.

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Section: Comparison With Adsorption Behavior Of Clay Mineralsmentioning

confidence: 74%

Adsorption Behaviors of Lanthanum (III) and Yttrium (III) Ions on Gibbsite

Zhou,

Wan,

et al. 2023

Minerals

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“…The point of zero charge is a crucial parameter for understanding the aggregation and agglomeration behavior of particles. When dispersed in solutions at the PZC pH, the surface charge of the particles approaches zero, and their electrostatic force decreases, leading to the formation of agglomeration among them [42]. This parameter helps define the most suitable pH range for achieving efficient removal of a specific contaminant, whether it is of an anionic or cationic nature [8,43].…”

Section: Points Of Zero Charge (Pzcs)mentioning

confidence: 99%

Removal of Brilliant Green Cationic Dye Using Bioadsorbent Material from Oyster Shells

Moreno-Ríos,

Coronado-Herrera,

Rhenals-Navarro

et al. 2023

Sustainability

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This study explored the potential of coral rock, specifically coquina derived from oyster shells, as a bioadsorbent for the removal of dyes from wastewater generated by the textile industry. The investigation included an examination of particle size fractions (300 µm and less than 300 µm) and thermal treatment; the investigation involved drying at 120 °C and calcination at temperatures ranging from 200 °C to 800 °C. The material was subjected to a comprehensive analysis through various characterization techniques. Laboratory-scale experiments were conducted to evaluate the removal capacity and adsorption kinetics of the bioadsorbent utilizing brilliant green dye. The experiments involved varying dye concentrations (25, 50, and 75 mg L−1), pH levels (2 to 12), and different doses of biosorbent material (0.2 to 0.6 g L−1), with constant agitation. Various kinetic models were applied to fit the experimental data, with the pseudo-second-order model demonstrating the best fit. The findings reveal that coquina rock, characterized by a temperature of 120 °C and a particle size of greater than 300 µm, exhibits remarkable effectiveness. It achieved a removal efficiency of 90% within 15 to 20 min at pH 7.8. This study concludes that coquina rock not only stands out as demonstrating remarkable efficacy in dye removal but also underscores a sustainable approach, leveraging readily available and environmentally friendly materials for wastewater treatment.

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A Method to Increase the Adsorption Properties of Silica at Acidic pH Using Iron Oxide Nanoparticles

Marć,

Drzewiński,

Wolak

et al. 2024

Part & Part Syst Charact

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Silica is a frequently used material for removing organic contaminants, dyes, and metal ions from wastewater due to its large specific surface area and ease of preparation at various porosities. In a wide range of pH values, a negative charge is created on its surface as a result of the deprotonation of silanols, which causes its strong adsorption properties in alkaline media. It is found that a composite material consisting of mesoporous silica with iron oxide nanoparticles, which have a point of zero charge (PZC) much larger than silica, can exhibit strong adsorption properties in acidic media as well. This is confirmed by the analysis of the Zeta potential and a significant increase in the adsorption of methylene blue by modified silica at pH values of 4 and above. It is also showed that the microscopic mechanism underlying this behavior relies on the coexistence of two length scales: the Debye shielding range for Coulombic interactions and the average pore size where the iron oxide nanoparticles are synthesized.

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The pH dependent surface charging and points of zero charge. X. Update

Cited by 14 publications

References 248 publications

Adsorption Behaviors of Lanthanum (III) and Yttrium (III) Ions on Gibbsite

Adsorption Behaviors of Lanthanum (III) and Yttrium (III) Ions on Gibbsite

Removal of Brilliant Green Cationic Dye Using Bioadsorbent Material from Oyster Shells

A Method to Increase the Adsorption Properties of Silica at Acidic pH Using Iron Oxide Nanoparticles

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