scholarly journals Sr2+ sorption property of seaweed-like sodium titanate mats: effects of crystallographic properties

RSC Advances ◽  
2021 ◽  
Vol 11 (30) ◽  
pp. 18676-18684
Author(s):  
Yoshifumi Kondo ◽  
Tomoyo Goto ◽  
Tohru Sekino
Keyword(s):  
Sorption Capacity ◽  
Sorption Property ◽  
Sodium Titanate ◽  
Micro Scale

Seaweed-like sodium titanate mats (SSTs) have excellent sorption capacity of Sr2+ compared to sodium trititanate monodispersed nanofibers due to the sodium dititanate structure and its unique nano/micro-scale morphologies.

scholarly journals Sorption capacity of seaweed-like sodium titanate mats for Co2+ removal

RSC Advances ◽  
2020 ◽  
Vol 10 (67) ◽  
pp. 41032-41040
Author(s):  
Yoshifumi Kondo ◽  
Tomoyo Goto ◽  
Tohru Sekino
Keyword(s):  
Crystal Structure ◽  
Ion Exchange ◽  
Exchange Reaction ◽  
Sorption Capacity ◽  
Sodium Titanate ◽  
Co2 Removal ◽  
Ion Exchange Reaction ◽  
Low Crystallinity

The seaweed-like sodium titanate mat has a high Co2+ sorption capacity via the ion-exchange reaction due to its crystal structure, low crystallinity, and morphology.

scholarly journals Characterization and Sodium Cations Sorption Capacity of Chemically Modified Biochars Produced from Agricultural and Forestry Wastes

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4714
Author(s):  
Agnieszka Medyńska-Juraszek ◽  
María Luisa Álvarez ◽  
Andrzej Białowiec ◽  
Maria Jerzykiewicz
Keyword(s):  
Sorption Capacity ◽  
Energy Demand ◽  
Structural Changes ◽  
Activated Carbons ◽  
Chemical Activation ◽  
Sorption Property ◽  
Water Desalination ◽  
Limiting Factor ◽  
Chemically Modified ◽  
Sodium Cations

Excessive amounts of sodium cations (Na+) in water is an important limiting factor to reuse poor quality water in agriculture or industry, and recently, much attention has been paid to developing cost-effective and easily available water desalination technology that is not limited to natural resources. Biochar seems to be a promising solution for reducing high loads of inorganic contaminant from water and soil solution, and due to the high availability of biomass in agriculture and forestry, its production for these purposes may become beneficial. In the present research, wheat straw, sunflower husk, and pine-chip biochars produced at 250, 450 and 550 °C under simple torrefaction/pyrolysis conditions were chemically modified with ethanol or HCl to determine the effect of these activations on Na sorption capacity from aqueous solution. Biochar sorption property measurements, such as specific surface area, cation exchange capacity, content of base cations in exchangeable forms, and structural changes of biochar surface, were performed by FTIR and EPR spectrometry to study the effect of material chemical activation. The sorption capacity of biochars and activated carbons was investigated by performing batch sorption experiments, and adsorption isotherms were tested with Langmuir’s and Freundlich’s models. The results showed that biochar activation had significant effects on the sorption characteristics of Na+, increasing its capacity (even 10-folds) and inducing the mechanism of ion exchange between biochar and saline solution, especially when ethanol activation was applied. The findings of this study show that biochar produced through torrefaction with ethanol activation requires lower energy demand and carbon footprint and, therefore, is a promising method for studying material applications for environmental and industrial purposes.

scholarly journals Synergy of Parameters Determining the Optimal Properties of Coal as a Natural Sorbent

Energies ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1967 ◽  
Author(s):  
Katarzyna Godyń ◽  
Barbara Dutka ◽  
Monika Chuchro ◽  
Mariusz Młynarczuk
Keyword(s):  
Multiple Regression ◽  
Sorption Capacity ◽  
Vitrinite Reflectance ◽  
Sorption Property ◽  
Effective Diffusion ◽  
Gravimetric Method ◽  
Low Rank ◽  
Petrographic Analysis ◽  
Natural Sorbent ◽  
Specific Pore Volume

Selection of the optimal properties of coal as a natural sorbent, both as a sample collected from a seam or of the coal seam itself, requires various parameters to be determined and may not be based on the knowledge of metamorphism degree only. In order to improve the predictions of sorption capacity and the kinetics, analyses of correlation and multiple regression based on the results of laboratory studies were performed for 15 coal samples with various coal rank. The maximum vitrinite reflectance (R0) for low-rank coals was 0.78%–0.85%, and 0.98%–1.15% and 1.85%–2.03% for medium- and high-rank coals, respectively. Coal samples were subjected to technical and petrographic analysis. The gravimetric method was used to perform sorption tests using methane, in order to determine the sorption capacity and the effective diffusion coefficient for each of the coals. Pycnometric methods were used to determine the textural parameters of coals, such as the percentage porosity and specific pore volume. The studies were further supplemented with an evaluation of the mechanical properties of the coals, Vickers micro-hardness, and elastic modulus. This work shows that the statistical multiple regression method enables a computational model including the selected petrophysical parameters displaying synergy with the specific sorption property—capacity or kinetics—to be created. The results showed the usefulness of this analysis in providing improved predictions of the optimal sorption properties of coal as a natural sorbent.

scholarly journals Sorption and Micro-Scale Strength Properties of Coals Susceptible to Outburst Caused by Changes in Degree of Coalification

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5807
Author(s):  
Katarzyna Godyń ◽  
Barbara Dutka
Keyword(s):  
Sorption Capacity ◽  
Effective Diffusion ◽  
Gravimetric Method ◽  
Strength Properties ◽  
Methane Content ◽  
Warning Sign ◽  
Micro Scale ◽  
Effective Diffusion Coefficients ◽  
Upper Silesian Coal Basin ◽  
Methane Sorption

Coals from the south-western part of the Upper Silesian Coal Basin have a strong outburst susceptibility. The objective of this study was to identify the influence of coalification degree on methane sorption and micro scale strength properties of 24 coals from Jastrzębie Zdrój. Coal samples showed a reflectance Ro between 0.98 and 1.25%. Sorption measurements were carried out by gravimetric method. Sorption capacities were determined at mean deposit temperature of 35 °C. Using the unipore model and solution of Fick’s second law, the effective diffusion coefficients of methane in the studied coals were obtained. The Vickers method was used to study the microhardness and the modulus of elasticity. It has been shown that the increase in the coalification degree reduces the sorption capacity of coal and also reduces the rate of methane emission. Coals the most susceptible to outbursts, were the most brittle. With the increase in Ro, the methane seam pressure p increased as well as desorbable methane content DMC, both due to the reduction in the sorption capacity of coal. The increased dp index is a warning sign indicating an increased total methane content of coal seam, an increased seam pressure or an alternation of coal structure.

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