Characteristics of Phosphate Ion Adsorption-Desorption onto Aluminum Oxide Hydroxide for Preventing Eutrophication

2003 ◽  
Vol 36 (4) ◽  
pp. 499-505 ◽  
Author(s):  
Mineaki Kabayama ◽  
Tohru Sakiyama ◽  
Naohito Kawasaki ◽  
Takeo Nakamura ◽  
Mamiko Araki ◽  
...  
Keyword(s):  
Aluminum Oxide ◽  
Ion Adsorption ◽  
Phosphate Ion ◽  
Oxide Hydroxide ◽  
Adsorption Desorption

scholarly journals Extraction and Mass Spectrometric Characterization of Terpenes Recovered from Olive Leaves Using a New Adsorbent-Assisted Supercritical CO2 Process

Foods ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 1301
Author(s):  
Zully J. Suárez Montenegro ◽  
Gerardo Álvarez-Rivera ◽  
Jose A. Mendiola ◽  
Elena Ibáñez ◽  
Alejandro Cifuentes
Keyword(s):  
Aluminum Oxide ◽  
Silica Gel ◽  
Supercritical Co2 ◽  
Olive Leaves ◽  
Fractionation Process ◽  
Selective Enrichment ◽  
Adsorption Desorption ◽  
First Time ◽  
By Products

This work reports the use of GC-QTOF-MS to obtain a deep characterization of terpenoid compounds recovered from olive leaves, which is one of the largest by-products generated by the olive oil industry. This work includes an innovative supercritical CO2 fractionation process based on the online coupling of supercritical fluid extraction (SFE) and dynamic adsorption/desorption for the selective enrichment of terpenoids in the different olive leaves extracts. The selectivity of different commercial adsorbents such as silica gel, zeolite, and aluminum oxide was evaluated toward the different terpene families present in olive leaves. Operating at 30 MPa and 60 °C, an adsorbent-assisted fractionation was carried out every 20 min for a total time of 120 min. For the first time, GC-QTOF-MS allowed the identification of 40 terpenoids in olive leaves. The GC-QTOF-MS results indicate that silica gel is a suitable adsorbent to partially retain polyunsaturated C10 and C15 terpenes. In addition, aluminum oxide increases C20 recoveries, whereas crystalline zeolites favor C30 terpenes recoveries. The different healthy properties that have been described for terpenoids makes the current SFE-GC-QTOF-MS process especially interesting and suitable for their revalorization.

Time Transient of Calcium and Phosphate Ion Adsorption by Rutile Crystal Facets in Hanks’ Solution Characterized by XPS

Langmuir ◽  
2021 ◽  
Author(s):  
Akari Hiji ◽  
Takao Hanawa ◽  
Taishi Yokoi ◽  
Peng Chen ◽  
Maki Ashida ◽  
...  
Keyword(s):  
Ion Adsorption ◽  
Phosphate Ion ◽  
Rutile Crystal

Preparation of Amorphous Aluminum Oxide-Hydroxide Nanoparticles in Amphiphilic Silicone-Based Copolymer Microemulsions

2002 ◽  
Vol 245 (1) ◽  
pp. 58-67 ◽  
Author(s):  
Yana Berkovich ◽  
Abraham Aserin ◽  
Ellen Wachtel ◽  
Nissim Garti
Keyword(s):  
Aluminum Oxide ◽  
Oxide Hydroxide

In situ tailoring bimetallic-organic frameworks derived yolk-shell NiS2/CuS hollow microspheres: an extraordinary kinetically pseudocapacitive nanoreactor for effective sodium-ion storage anode

2021 ◽  
Author(s):  
wen xi zhao ◽  
Xiaodeng Wang ◽  
Xiaoqing Ma ◽  
Luchao Yue ◽  
Qian Liu ◽  
...  
Keyword(s):  
Sodium Ion ◽  
Ion Adsorption ◽  
Redox Kinetics ◽  
Diffusion Limited ◽  
Ion Storage ◽  
Sluggish Diffusion ◽  
Fast Ion ◽  
Adsorption Desorption ◽  
Sodium Ion Storage

Pseudocapacitive electrochemical Na+-storage has been highlighted as one of the exploitable strategies in overcoming sluggish diffusion-limited redox kinetics due to effectively structural preserving and fast ion adsorption/desorption at the surface...

scholarly journals Adsorption/Desorption Characteristics of Phosphate Ion onto Calcined Boehmite Surface

2005 ◽  
Vol 3 ◽  
pp. 63-69 ◽  
Author(s):  
Mineaki Kabayama ◽  
Naohito Kawasaki ◽  
Takeo Nakamura ◽  
Seiki Tanada
Keyword(s):  
Phosphate Ion ◽  
Adsorption Desorption

An investigation of phosphate ion adsorption from aqueous solution by fly ash and slag

2000 ◽  
Vol 30 (5) ◽  
pp. 823-826 ◽  
Author(s):  
N.M. Agyei ◽  
C.A. Strydom ◽  
J.H. Potgieter
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Ion Adsorption ◽  
Phosphate Ion

Characterization of Ion Transport and -Sorption in a Carbon Based Porous Electrode for Desalination Purposes

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Onur N. Demirer ◽  
Rebecca L. Clifton ◽  
Carlos A. Rios Perez ◽  
Rachel Naylor ◽  
Carlos Hidrovo
Keyword(s):  
Electric Field ◽  
Energy Recovery ◽  
Porous Electrode ◽  
Water Desalination ◽  
Thermodynamic Efficiency ◽  
Ion Adsorption ◽  
Test Results ◽  
Ionic Adsorption ◽  
Adsorption Desorption ◽  
Carbon Based

New and more efficient water desalination technologies have been a topic of incipient research over the past few decades. Although the focus has been placed on the improvement of membrane-based desalination methods such as reverse osmosis, the development of new high surface area carbon-based-electrode materials have brought substantial interest towards capacitive deionization (CDI), a novel technique that uses an electric field to separate the ionic species from the water. Part of the new interest on CDI is its ability to store and return a fraction of the energy used in the desalination process. This characteristic is not common to other electric-field-based desalination methods such as electro-deionization and electrodialysis reversal where none of the input energy is recoverable. This paper presents work conducted to analyze the energy recovery, thermodynamic efficiency, and ionic adsorption/desorption rates in a CDI cell using different salt concentration solutions and various flow rates. Voltage and electrical current measurements are conducted during the desalination and electrode regeneration processes and used to evaluate the energy recovery ratio. Salinity measurements of the inflow and outflow stream concentrations using conductivity probes, alongside the current measurements, are used to calculate ion adsorption efficiency. Two analytical species transport models are developed to estimate the net ionic adsorption rates in a steady-state and nonsaturated porous electrode scenario. Finally, the convective and electrokinetic transport times are compared and their effect on desalination performance is presented. Steady test results for outlet to inlet concentration ratio show a strong dependence on flow rate and concentration independence for dilute solutions. In addition, transient test results indicate that the net electrical energy requirement is dependent on the number of carbon electrode regeneration cycles, which is thought to be due to imperfect regeneration. The energy requirements and adsorption/desorption rate analyses conducted for this water-desalination process could be extended to other ion-adsorption applications such as the reprocessing of lubricants or spent nuclear fuels in a near future.

scholarly journals The Methanol Adsorption in Microporous Alumina Agglomerates

2019 ◽  
Vol 3 (1) ◽  
pp. 22
Author(s):  
Grygorii Dragan ◽  
Volodymyr Kutarov ◽  
Mykola Poletaiev ◽  
Kyrylo Kolesnykov ◽  
Mariya Khlebnikova
Keyword(s):  
Aluminum Oxide ◽  
Adsorption Equilibrium ◽  
Capillary Condensation ◽  
Quantitative Description ◽  
Gas Dispersion ◽  
Volume Filling ◽  
Qualitative And Quantitative ◽  
Methanol Adsorption ◽  
Adsorption Desorption ◽  
Open Slit

We have studied theoretical and experimental methods of methanol adsorption in micropores of aluminum oxide agglomerates obtained by gas-dispersion synthesis. It is shown that the necessity to use strict equations based on the theory of volume filling of micropores, which implies a physical and formal analogy between the volume filling of micropores and capillary condensation, for qualitative and quantitative description of adsorption equilibrium in open slit-like micropores. The applicability of the proposed equations for the description of adsorption equilibrium in such systems is demonstrated on the example of experimental methanol adsorption/desorption isotherm on the aluminum oxide, which possesses a microporous structure.

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