Adsorptive removal of vitamin B 6 and ciprofloxacin using polyurethane foam in pure and pharmaceutical preparations: Kinetic and equilibrium studies

2020 ◽  
Author(s):  
Samah Ali ◽  
Hanaa A. Hassanin
Keyword(s):  
Polyurethane Foam ◽  
Pharmaceutical Preparations ◽  
Vitamin B ◽  
Equilibrium Studies ◽  
Adsorptive Removal

ADSORPTIVE REMOVAL OF Cu (II) IONS BY DATE PITS: KINETIC AND EQUILIBRIUM STUDIES

2016 ◽  
Vol 15 (12) ◽  
pp. 2719-2732 ◽  
Author(s):  
Tarek E. Khalil ◽  
Hossam Altaher ◽  
Reda Abubeah
Keyword(s):  
Equilibrium Studies ◽  
Adsorptive Removal ◽  
Date Pits

scholarly journals A facile, versatile approach to hydroxyl-anchored metal oxides with high Cr(VI) adsorption performance in water treatment

2016 ◽  
Vol 3 (11) ◽  
pp. 160524 ◽  
Author(s):  
Ji Ma ◽  
SiZhi Zuo-Jiang ◽  
Yunhao He ◽  
Qinglei Sun ◽  
Yunguo Wang ◽  
...  
Keyword(s):  
High Performance ◽  
Hydroxyl Groups ◽  
High Concentration ◽  
Equilibrium Studies ◽  
Surface Hydroxyl ◽  
Adsorptive Removal ◽  
Surface Hydroxyl Groups ◽  
High Maximum ◽  
Ph Range ◽  
Hydroxyl Protons

In this study, a facile and versatile urea-assisted approach was proposed to synthesize Chinese rose-like NiO, pinecone-like ZnO and sponge-like CoO adsorbents. The presence of urea during syntheses endowed these adsorbents with high concentration of surface hydroxyl groups, which was estimated as 1.83, 1.32 and 4.19 mmol [OH − ] g −1 for NiO, ZnO and CoO adsorbents, respectively. These surface hydroxyl groups would facilitate the adsorption of Cr( vi ) species (e.g. HCrO 4 − , Cr 2 O 7 2− and CrO 4 2− ) from wastewater by exchanging with hydroxyl protons or hydroxide ions, and hence result in extremely high maximum adsorbed amounts of Cr( vi ), being 2974, 14 256 and 408 mg g −1 for NiO, ZnO and CoO adsorbents in the pH range of 5.02–5.66 at 298 K, respectively. More strikingly, the maximum adsorbed amounts of Cr( vi ) would be greatly enhanced as the adsorbing temperature is increased, and even amount to 23 411 mg g −1 for ZnO adsorbents at 323 K. Based on the kinetics and equilibrium studies of adsorptive removal of Cr( vi ) from wastewater, our synthetic route will greatly improve the adsorptivity of the as-synthesized metal-oxide adsorbents, and hence it will shed new light on the development of high-performance adsorbents.

Kinetic and Equilibrium Studies on Adsorptive Removal of Toluidine Blue by Water-Insoluble Starch Sulfate

2011 ◽  
Vol 56 (5) ◽  
pp. 1875-1881 ◽  
Author(s):  
Lei Guo ◽  
Guiying Li ◽  
Junshen Liu ◽  
Songmei Ma ◽  
Jinfeng Zhang
Keyword(s):  
Toluidine Blue ◽  
Equilibrium Studies ◽  
Adsorptive Removal

Kinetics and equilibrium studies of copper, zinc, and nickel ions adsorptive removal on to Archontophoenix alexandrae: conditions optimization by RSM

2020 ◽  
Vol 201 ◽  
pp. 289-300
Author(s):  
Raseed A. Khera ◽  
Munawar Iqbal ◽  
Aftab Ahmad ◽  
Syeda M. Hassan ◽  
Arif Nazir ◽  
...  
Keyword(s):  
Equilibrium Studies ◽  
Nickel Ions ◽  
Adsorptive Removal ◽  
Copper Zinc

Kinetic and equilibrium studies of adsorptive removal of phenol onto eggshell waste

2012 ◽  
Vol 20 (7) ◽  
pp. 4603-4611 ◽  
Author(s):  
H. Daraei ◽  
A. Mittal ◽  
M. Noorisepehr ◽  
F. Daraei
Keyword(s):  
Equilibrium Studies ◽  
Adsorptive Removal ◽  
Eggshell Waste

scholarly journals Photo, thermal and chemical degradation of riboflavin

2014 ◽  
Vol 10 ◽  
pp. 1999-2012 ◽  
Author(s):  
Muhammad Ali Sheraz ◽  
Sadia Hafeez Kazi ◽  
Sofia Ahmed ◽  
Zubair Anwar ◽  
Iqbal Ahmad
Keyword(s):  
General Scheme ◽  
Pharmaceutical Preparations ◽  
Solvent Polarity ◽  
Food Products ◽  
Water Soluble ◽  
Chemical Degradation ◽  
Complexing Agents ◽  
Vitamin B ◽  
Oxygen Buffer ◽  
The Stability

Riboflavin (RF), also known as vitamin B2, belongs to the class of water-soluble vitamins and is widely present in a variety of food products. It is sensitive to light and high temperature, and therefore, needs a consideration of these factors for its stability in food products and pharmaceutical preparations. A number of other factors have also been identified that affect the stability of RF. These factors include radiation source, its intensity and wavelength, pH, presence of oxygen, buffer concentration and ionic strength, solvent polarity and viscosity, and use of stabilizers and complexing agents. A detailed review of the literature in this field has been made and all those factors that affect the photo, thermal and chemical degradation of RF have been discussed. RF undergoes degradation through several mechanisms and an understanding of the mode of photo- and thermal degradation of RF may help in the stabilization of the vitamin. A general scheme for the photodegradation of RF is presented.

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