Removal of U(VI) from aqueous solution by adsorption onto synthesized silica and zinc silicate nanotubes: Equilibrium and kinetic aspects with application to real samples

2018 ◽  
Vol 10 ◽  
pp. 127-139 ◽  
Author(s):  
Shalini Tripathi ◽  
Ahin Roy ◽  
Sajitha Nair ◽  
Smeer Durani ◽  
Roopa Bose
Keyword(s):  
Aqueous Solution ◽  
Zinc Silicate ◽  
Real Samples

scholarly journals Synthesis, Characterization and Application of Nano-adsorbent Materials in the Sorption of Pb(II), Ni(II), Co(II), Mn(II), Li(I) from Aqueous Solution

2014 ◽  
Vol 10 (8) ◽  
pp. 3053-3067 ◽  
Author(s):  
Hamdi Mohamed Hassan Gad ◽  
Sh. Labib ◽  
M. I. Aly
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Activated Carbon ◽  
Sorption Process ◽  
Zinc Silicate ◽  
Activation Technique ◽  
Factors Affecting ◽  
Nano Zinc ◽  
Adsorbent Materials ◽  
Nano Adsorbent

In this study, nano-adsorbent materials were synthesized from two different precursors by thermal activation technique. The first was the synthesizing of nano-zinc silicate from chemical reagents of zinc oxide and commercial silica gel. The second was the preparation of nano-pore size activated carbon from different biomass. The synthesized nano-adsorbent materials were characterized by different techniques; Surface Area, FTIR, XRD and SEM. The prepared nano-adsorbent materials were applied in the sorption and separation of some heavy metals from aqueous solution. These metals includes; Pb (II), Ni(II), Co(II), Mn(II) and Li(I). Some factors affecting on the sorption process (e.g. contact time and pH) were investigated. It was found that: the nano-zinc silicate (of ratio 1:1 thermally treated at 700 0C) and nano-pores activated carbon (prepared from saw dust impregnated with 70% H3PO4 overnight, then heated to 500 0C in presence of steam for 80 min.) were the best samples for sorption and separation of concerned heavy metals.

Central composite design optimization of Ce(iii) ion removal from aqueous solution using modified SBA-15 mesoporous silica

2016 ◽  
Vol 40 (6) ◽  
pp. 5128-5134 ◽  
Author(s):  
Rouholah Zare-Dorabei ◽  
Vahideh Jalalat ◽  
Azadeh Tadjarodi
Keyword(s):  
Aqueous Solution ◽  
Mesoporous Silica ◽  
Central Composite Design ◽  
Design Optimization ◽  
Real Samples ◽  
Ion Removal ◽  
Cerium Ion ◽  
Central Composite

HESI-SBA-15 was used as an effective adsorbent for cerium ion removal in real samples.

scholarly journals Preparation and electrical properties of LISICON-type lithium zinc silicate from aqueous solution

2022 ◽  
Vol 130 (1) ◽  
pp. 29-34
Author(s):  
Ryuya SUZUKI ◽  
Seiji ONO ◽  
Yasunobu AKIYAMA ◽  
Takashi ASAKA ◽  
Yoshiharu MATSUMAE ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electrical Properties ◽  
Zinc Silicate

scholarly journals ELECTROCHEMICAL SYNTHEZIS AND CHARACTERIZATION OF POLYPYRROLE FOR DODECYLSULFATE SENSOR MEMBRANE

2010 ◽  
Vol 7 (3) ◽  
pp. 249-253 ◽  
Author(s):  
Abdul Haris Watoni ◽  
Suryo Gandasasmita ◽  
Indra Noviandri ◽  
Buchari Buchari
Keyword(s):  
Aqueous Solution ◽  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Supporting Electrolyte ◽  
Linear Potential ◽  
Potential Response ◽  
Real Samples ◽  
Sensor Membrane ◽  
Pyrrole Monomer

A conducting polymer, polypyrrole, has been electrochemically synthesized from pyrrole monomer using cyclic voltammetry technique in aqueous solution in the presence of HDS dopant and KNO3 supporting electrolyte. The polymer was deposited on the surface of an Au-wire and the modified electrode obtained was then used as dodecylsulfate (DS-) ion sensor electrode. The best performance PPy-DS modified-Au electrode conditioned in the air system without HDS or SDS solution gave linear potential response for the concentration range of 1.0 x 10-5 - 1.0 x 10-3 M, sensitivity of 54.5 mV/decade, detection limit of 1.0 x 10-5 M, and response time of 23 - 30 second.  The electrode showed good selectivity towards other anions, therefore can be used to determine SDS concentration in real samples system without any change of the samples matrix.   Keywords: polypyrrole, SDS, cyclic voltammetry

A fluorescent turn-on probe of naphthalimide for sensitive and specific detection of iodide in neutral aqueous solution and real samples

2014 ◽  
Vol 6 (22) ◽  
pp. 8890-8893 ◽  
Author(s):  
Dandan Li ◽  
Xinlei Chen ◽  
Yang Li ◽  
Tanyu Cheng ◽  
Weiping Zhu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantitative Detection ◽  
Specific Detection ◽  
Real Samples ◽  
Turn On ◽  
Neutral Aqueous Solution

A new naphthalimide-based fluorescent turn-on probe was developed for quantitative detection of iodide in neutral aqueous solution.

Structures Formed by Cryoprotective Agents Used in Freezc-Etching

1971 ◽  
Vol 29 ◽  
pp. 448-449
Author(s):  
G. G. Cocks ◽  
C. E. Cluthe
Keyword(s):  
Aqueous Solution ◽  
Polyethylene Oxide ◽  
Liquid Nitrogen Temperature ◽  
Ice Crystals ◽  
Etching Technique ◽  
Structural Constituent ◽  
Cryoprotective Agents ◽  
Quick Freezing ◽  
Freeze Etching ◽  
Fractured Surface

The freeze etching technique is potentially useful for examining dilute solutions or suspensions of macromolecular materials. Quick freezing of aqueous solutions in Freon or propane at or near liquid nitrogen temperature produces relatively large ice crystals and these crystals may damage the structures to be examined. Cryoprotective agents may reduce damage to the specimem, hut their use often results in the formation of a different set of specimem artifacts.In a study of the structure of polyethylene oxide gels glycerol and sucrose were used as cryoprotective agents. The experiments reported here show some of the structures which can appear when these cryoprotective agents are used.Figure 1 shows a fractured surface of a frozen 25% aqueous solution of sucrose. The branches of dendritic ice crystals surrounded hy ice-sucrose eutectic can be seen. When this fractured surface is etched the ice in the dendrites sublimes giving the type of structure shown in Figure 2. The ice-sucrose eutectic etches much more slowly. It is the smooth continuous structural constituent surrounding the branches of the dendrites.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

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