scholarly journals Zeolite-Polymer Composite Materials as Water Scavenger

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4815
Author(s):  
Zakaria Tahraoui ◽  
Habiba Nouali ◽  
Claire Marichal ◽  
Patrice Forler ◽  
Julien Klein ◽  
...  
Keyword(s):  
Composite Materials ◽  
Large Scale ◽  
Water Adsorption ◽  
Exchange Process ◽  
Nitrogen Adsorption ◽  
Adsorption Properties ◽  
Homogeneous Distribution ◽  
Molded Parts ◽  
Edx Analyses ◽  
Composite Samples

The influence of the charge compensating cation nature (Na+, Mg2+) on the water adsorption properties of LTA-type zeolites used as filler in composite materials (zeolite/polymers) was investigated. Large scale cation exchanges were performed on zeolite powder at 80 °C for 2 h using 1 M magnesium chloride (MgCl2) aqueous solutions. XRF, ICP, and EDX analyses indicate a successful cationic exchange process without the modification of the zeolite structure as shown by XRD and solid-state NMR analyses. Composite materials (granulates and molded parts) were manufactured using to extrusion and injection processes. In the case of MgA zeolite, nitrogen adsorption–desorption experiments allowed us to measure a microporous volume, unlike NaA zeolite, which is non-porous to nitrogen probe molecule. SEM and EDX analyses highlighted the homogeneous distribution of zeolite crystals into the polymer matrix. Water adsorption capacities confirmed that the trends observed in the zeolite powder samples are preserved after dragging zeolites into composite formulations. Granulates and molded parts composite samples containing the magnesium exchanged zeolite showed an increase of their water adsorption capacity up to +27% in comparison to composite samples containing the non-exchanged zeolite. The MgA composite is more promising for water decontamination applications due to its higher water adsorption properties than the NaA composite.

scholarly journals Influence of the Compensating Cation Nature on the Water Adsorption Properties of Zeolites

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 944 ◽  
Author(s):  
Zakaria Tahraoui ◽  
Habiba Nouali ◽  
Claire Marichal ◽  
Patrice Forler ◽  
Julien Klein ◽  
...  
Keyword(s):  
Solid State Nmr ◽  
Water Adsorption ◽  
Nitrogen Adsorption ◽  
Adsorption Properties ◽  
Monovalent Cations ◽  
Sodium Cations ◽  
Adsorption Of Water ◽  
Magnesium Cation ◽  
Adsorption Desorption ◽  
Cation Nature

The influence of the compensating cation (Na+, Li+, Mg2+) nature on the water adsorption properties of LTA and FAU-type zeolites was investigated. Cation exchanges were performed at 80 °C for 2 h using 1 M aqueous solutions of lithium chloride (LiCl) or magnesium chloride (MgCl2). XRF and ICP-OES analyses indicate that the cation exchange yields reach values between 59 to 89% depending on the number of exchange cycles and the nature of the zeolite and cation, while both zeolites structures are preserved during the process, as shown by XRD and solid state NMR analyses. Nitrogen adsorption-desorption experiments indicate a higher available microporous volume when sodium cations are replaced by smaller monovalent lithium cations or by divalent magnesium cations because twice less cations are needed compared to monovalent cations. Up to 15% of gain in the available microporous volume is obtained for FAU-type zeolites exchanged with magnesium cation. This improvement facilitates the adsorption of water with an increase in the water uptake up to 30% for the LTA and FAU type zeolites exchanged with magnesium. These exchanged zeolites are promising for uses in water decontamination because a smaller amount is needed to trap the same amount of water compared to their sodium counterparts.

Hexavalent chromium removal from water: adsorption properties of in natura and magnetic nanomodified sugarcane bagasse

2021 ◽  
Author(s):  
Thais Eduarda Abilio ◽  
Beatriz Caliman Soares ◽  
Julia Cristina José ◽  
Priscila Aparecida Milani ◽  
Geórgia Labuto ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Sugarcane Bagasse ◽  
Water Adsorption ◽  
Adsorption Properties ◽  
Chromium Removal

scholarly journals Oxidized BPL Carbons

1993 ◽  
Vol 10 (1-4) ◽  
pp. 75-84 ◽  
Author(s):  
S.S. Barton ◽  
M.J.B. Evans ◽  
J.A.F. Macdonald
Keyword(s):  
Nitric Acid ◽  
Surface Area ◽  
Water Adsorption ◽  
Adsorption Properties ◽  
Bet Surface Area ◽  
Adsorption Sites ◽  
A Value ◽  
Nitrogen Desorption ◽  
Oxidized Carbon ◽  
Increasing Temperature

A series of oxidized carbons has been prepared by treatment of the carbon with concentrated nitric acid at various temperatures, and the surface and adsorption properties of the prepared carbons studied. Water adsorption was modelled using a recently derived equation capable of predicting a value for the primary adsorption sites on the surface of a microporous carbon while fitting the experimentally determined isotherm at high relative pressures. The concentration of primary sites was seen to increase with increasing temperature of oxidation. The very highly oxidized carbon samples were found to have a significantly lower BET surface area determined from nitrogen desorption at 77 K and higher apparent density measured from mercury displacement.

scholarly journals ADSORPTION PROPERTIES OF TITANIA-SILICA MEMBRANES OBTAINED ON CERAMIC SUBSTRАTE

2018 ◽  
Vol 54 (3) ◽  
pp. 274-280
Author(s):  
T. F. Kouznetsova ◽  
A. I. Ivanets ◽  
J. D. Sauka
Keyword(s):  
Surface Area ◽  
Quartz Substrate ◽  
Cetylpyridinium Chloride ◽  
Nitrogen Adsorption ◽  
Mesoporous Structure ◽  
Adsorption Properties ◽  
Molar Ratio ◽  
Silica Membranes ◽  
Metal Silicate ◽  
Adsorption Desorption

Titania-silica membranes on a porous quartz substrate are prepared by its direct contact with metal silicate sol at various Ti/Si ratios in the conditions of coagel sedimentation and presence of cetylpyridinium chloride. The study of textural and adsorption properties of membranes is conducted by low-temperature nitrogen adsorption-desorption, including methods of t-plots and DFT theory. It was shown that obtained membranes have mesoporous structure with the specific surface area and pore hydraulic diameter varied in intervals of 64–217 m2 /g and 4–11 nm, respectively. Developed values of surface area remain up to molar ratio of Ti/Si = 50/50.

scholarly journals TFP Technology As Theadvanced Method Of Manufacture Of 3D Reinforced Preforms Frompolymer Composite Materials

2021 ◽  
Vol 12 (5) ◽  
pp. 84-91
Author(s):  
Nelyub Vladimir Aleksandrovich Et al.
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
3D Printing ◽  
Large Scale ◽  
Research Trends ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Prospective Research ◽  
Further Development

This paper contains an overview of world trends in the development of the TFP technologyenabling 3D printing of carbon fiber reinforced plastics. The review of the equipment used for the automated preformpatching is included. Primary factors restraining the large-scale implementation of the TFP technology in the manufacture are identified, and prospective research trends for further development of the technology are proposed.

Surface area, porosity and water adsorption properties of fine volcanic ash particles

2004 ◽  
Vol 67 (2) ◽  
pp. 160-169 ◽  
Author(s):  
Pierre Delmelle ◽  
Fr�d�ric Villi�ras ◽  
Manuel Pelletier
Keyword(s):  
Surface Area ◽  
Volcanic Ash ◽  
Water Adsorption ◽  
Adsorption Properties

When Water becomes an Integral Part of Carbon - Combining Theory and Experiment to Understand the Zeolite-like Water Adsorption Properties of porous C2N Materials

2021 ◽  
Author(s):  
Julian Heske ◽  
Ralf Walczak ◽  
Jan Dirk Epping ◽  
Sol Youk ◽  
Sudhir Kumar Sahoo ◽  
...  
Keyword(s):  
Water Adsorption ◽  
Adsorption Properties ◽  
Water Molecules ◽  
Theory And Experiment

The interaction between water molecules and surfaces in porous systems is of huge importance in various fields including but not limited to catalysis, adsorption, and the storage or conversion of...

Analysis of tribological properties of graphite and aluminum composite materials prepared by powder metallurgy technique

2020 ◽  
Vol 10 (5) ◽  
pp. 663-670
Author(s):  
Zhigang Wang ◽  
Jun Li ◽  
Daquan Li
Keyword(s):  
Composite Materials ◽  
Powder Metallurgy ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Utilization Rate ◽  
Powder Metallurgy Technique ◽  
Aluminum Composite ◽  
Powder Metallurgy Process ◽  
Metallurgy Process ◽  
Composite Samples

In order to make full use of the wear resistance and antifriction of the mixed reinforced particles, improve the performance and utilization rate of the composite material, and reduce its wear amount, in this study, graphite and aluminum composite materials with different graphite concentration were prepared by powder metallurgy process. On this basis, the influence of different graphite concentration on the friction coefficient and wear amount of composite samples and different load on the wear amount of composite materials were discussed and analyzed. The results show that with the increase of graphite content, the friction coefficient and wear amount of the composite will decrease correspondingly. When the load is less than 30 N, the wear curve of the sample changes steadily. When the load is more than 30 N, the wear will increase sharply. Therefore, the analysis of the tribological properties of the graphite and aluminum composites based on the powder metallurgy process plays an important role in improving the utilization rate of the composite and reducing its wear.

Sign in / Sign up

Export Citation Format

Share Document