Investigation of HEU-type zeolite crystals after interaction with Sr2+ cations in aqueous solution using nuclear and surface analytical techniques

1999 ◽  
Vol 241 (3) ◽  
pp. 519-527 ◽  
Author(s):  
J. Orechovska ◽  
P. Misaelides ◽  
A. Godelitsas ◽  
P. Rajec ◽  
H. Klewe-Nebenius ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Analytical Techniques ◽  
Type Zeolite ◽  
Zeolite Crystals

scholarly journals Effects of Synthesis Parameters on Crystallization Behavior of K-MER Zeolite and Its Morphological Properties on Catalytic Cyanoethylation Reaction

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 64 ◽  
Author(s):  
Ying-Wai Cheong ◽  
Ka-Lun Wong ◽  
Boon Seng Ooi ◽  
Tau Chuan Ling ◽  
Fitri Khoerunnisa ◽  
...  
Keyword(s):  
Crystallization Behavior ◽  
Catalytic Performance ◽  
Morphological Properties ◽  
Crystallization Time ◽  
Microporous Material ◽  
Profound Impact ◽  
Synthesis Parameters ◽  
Type Zeolite ◽  
Catalytic Performances ◽  
Zeolite Crystals

MER-type zeolite is an interesting microporous material that has been widely used in catalysis and separation. By carefully controlling the synthesis parameters, a procedure to synthesize K-MER zeolite crystals with various morphologies has been developed. The silica, water and mineralizer content in the synthesis gel, as well as crystallization time and temperature, have a profound impact on the crystallization kinetics, resulting in zeolite solids with various degrees of crystallinity, crystal sizes and shapes. K-MER zeolite crystals with nanorod, bullet-like, prismatic and wheatsheaf-like morphologies have been successfully obtained. The catalytic performances of the K-MER zeolites in cyanoethylation of methanol, under novel non-microwave instant heating, have been investigated. The zeolite in nanosize form shows the best catalytic performance (94.1% conversion, 100% selectivity) while the bullet-like zeolite gives poorest catalytic performance (44.2% conversion, 100% selectivity).

scholarly journals Removal of copper ions from aqueous solution using NaOH-treated rice husk

2020 ◽  
Vol 3 (6) ◽  
pp. 857-870
Author(s):  
Shagufta Zafar ◽  
Muhammad Imran Khan ◽  
Mushtaq Hussain Lashari ◽  
Majeda Khraisheh ◽  
Fares Almomani ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rice Husk ◽  
Contact Time ◽  
Copper Ions ◽  
Analytical Techniques ◽  
First Order ◽  
Freundlich Isotherms ◽  
Naoh Solution ◽  
Pseudo Second Order ◽  
Pseudo First Order

AbstractThe present study investigates the removal of copper ions (Cu (II)) from aqueous solution using chemically treated rice husk (TRH). The chemical treatment was carried out using NaOH solution and the effect of contact time (tc), adsorbent dosage (Dad), initial Cu (II) concentration ([Cu]i), and temperature (T) on the percentage removals of Cu (II) (%RCu) were investigated. Different analytical techniques (FTIR, SEM, and EDX) were used to confirm the adsorption (ads) of Cu (II) onto the TRH. The ads kinetics was tested against pseudo-first-order (PFO) and pseudo-second-order (PSO) models as well as Langmuir and Freundlich isotherms. Treating RH with NaOH altered the surface and functional groups, and on the surface of RH, the ionic ligands with high electro-attraction to Cu increased and thus improved the removal efficiency. The %RCu decreased by increasing the [Cu]i and increased by increasing the ct, Dad, and T. Up to 97% Cu removal was achieved in ct of 30 min using Dad of 0.3 g [Cu]i of 25 mg L−1 and T = 280 K. The ads of Cu on TRH is endothermic, spontaneous, follows Langmuir isotherms, and exhibited a PSO kinetics. Moreover, the TRH was successfully regenerated and used for further adsorption cycles using 1 M HNO3.

Strahlenchemie von Kohlenhydraten, IV. γ-Radiolyse von Cellobiose in N2O-gesättigter wäßriger Lösung / γ-Radiolysis of Cellobiose in N2O Saturated Aqueous Solution

1973 ◽  
Vol 28 (9-10) ◽  
pp. 635-646 ◽  
Author(s):  
Miral Dizdaroglu ◽  
Clemens Von Sonntag
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Column Chromatography ◽  
Gluconic Acid ◽  
Analytical Techniques ◽  
Saturated Aqueous Solution ◽  
Hydroxymethyl Furfural ◽  
Cellobionic Acid

After γ-radiolysis of N2O saturated deoxygenated aqueous solutions of cellobiose (10-2Μ) the following products have been determined: Glucose, gluconic acid, 5-keto-glucose, 4-deoxy-glucose, 5-deoxy-gluconic acid, 2-deoxy-gluconic acid, 3-deoxy-4-keto-glucose, 2-deoxy-5-keto-glucose, 4-deoxy-5-keto-glucose, arabinose, 2-deoxy-ribose, ribose, erythrose, threose, 2-deoxy-tetrose, dihydroxy acetone, 3-deoxy-pentulose, 2-butanone-1,4-diol, 5-hydroxymethyl-furfural, carbon monoxid, and C12-acids (probably cellobionic acid and 2-deoxy-cellobionic acid). Analytical techniques were column chromatography, t. l. c. and g. l. c. combined with m. s.

Polymer-cellulosic-clay and polymer-cellulosic-zeolitic biocomposites for the removal of methylene blue in aqueous solution

MRS Advances ◽  
2019 ◽  
Vol 4 (61-62) ◽  
pp. 3417-3421
Author(s):  
Ana Teresa Espinosa-Navarro ◽  
María del Carmen Díaz-Nava ◽  
Yolanda Alvarado-Pérez ◽  
Claudia Muro-Urista ◽  
José Juan García Sánchez
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Methylene Blue ◽  
Infrared Spectroscopy ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Type Zeolite ◽  
Modified Clinoptilolite ◽  
Scanning Electron ◽  
Alginate Matrix

ABSTRACTIn the present investigation, biocomposites were synthesized from a polymeric alginate matrix in which the carrot residue and a natural bentonite (ANat / Bio) or an iron-modified clinoptilolite-type zeolite (ZFe / Bio) were supported. Their properties were evaluated adsorbents in contact with aqueous solutions of methylene blue (MB). In the first hour of contact, 46% removal was obtained for the ZFe / Bio biocomposite and 60% for the ANat / Bio biocomposite; reaching 100% removal for the ZFe / Bio biocomposite and 98% for the ANat / Bio biocomposite after 24 hours. The biocomposites were characterized by Scanning Electron Microscopy (SEM) and Fourier Transformed Infrared Spectroscopy (FTIR).

scholarly journals 1-Hydroxy Ethylidene 1,1-Diphosphonic Acid (HEDP) as a Corrosion Inhibitor for Aluminium

2016 ◽  
Vol 8 (1) ◽  
pp. 1479-1490
Author(s):  
M. Hakeem ◽  
S. Rajendran ◽  
Peter Pascal Regis
Keyword(s):  
Aqueous Solution ◽  
Corrosion Inhibitor ◽  
Electrochemical Techniques ◽  
Film Surface ◽  
Analytical Techniques ◽  
Protective Film ◽  
Diphosphonic Acid ◽  
Force Microscopy ◽  
Atomic Force ◽  
Polarization Study

The present study is to use 1-hydroxy ethylidene 1, 1-diphosphonic acid (HEDP) as corrosion inhibitor for aluminium in aqueous solution containing 60 ppm Cl- ion was chosen as the inhibitor. Zn2+ is selected as the synergist, as Zn2+ ions in association with HEDP inhibitor is considered environmental friendly inhibitor for aluminium corrosion in alkaline (pH=11) media. The environment chosen is aqueous solution containing 60 ppm Cl- ions. To investigate the nature of the protective film, surface analytical techniques such as, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) have been put to use in the present study. The formation of protective film has been confirmed using the electrochemical techniques such as polarization study and AC impedance spectral study. The above studies support the weight loss study.

Sign in / Sign up

Export Citation Format

Share Document