Radiometric analysis of isotherms and thermodynamic parameters for cadmium(II) adsorption from aqueous medium by calcium alginate beads

2017 ◽  
Vol 312 (2) ◽  
pp. 343-354 ◽  
Author(s):  
Kangkana Sarkar ◽  
Kamalika Sen ◽  
Susanta Lahiri
Keyword(s):  
Aqueous Medium ◽  
Thermodynamic Parameters ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Calcium Alginate Beads ◽  
Radiometric Analysis

scholarly journals Thermodynamic, Kinetic, and Equilibrium Parameters for the Removal of Lead and Cadmium from Aqueous Solutions with Calcium Alginate Beads

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Ruth Alfaro-Cuevas-Villanueva ◽  
Aura Roxana Hidalgo-Vázquez ◽  
Consuelo de Jesús Cortés Penagos ◽  
Raúl Cortés-Martínez
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Second Order ◽  
Order Kinetic ◽  
Calcium Alginate Beads ◽  
Kinetic And Thermodynamic Parameters ◽  
Lead And Cadmium ◽  
Cadmium And Lead

The sorption of cadmium (Cd) and lead (Pb) by calcium alginate beads (CAB) from aqueous solutions in batch systems was investigated. The kinetic and thermodynamic parameters, as well as the sorption capacities of CAB in each system at different temperatures, were evaluated. The rate of sorption for both metals was rapid in the first 10 minutes and reached a maximum in 50 minutes. Sorption kinetic data were fitted to Lagergren, pseudo-second-order and Elovich models and it was found that the second-order kinetic model describes these data for the two metals; comparing kinetic parameters for Cd and Pb sorption a higher kinetic rate (K2) for Pb was observed, indicating that the interaction between lead cations and alginate beads was faster than for cadmium. Similarly, isotherm data were fitted to different models reported in literature and it was found that the Langmuir-Freundlich (L-F) and Dubinin-Radushkevich (D-R) models describe the isotherms in all cases. CAB sorption capacity for cadmium was 27.4 mg/g and 150.4 mg/g for lead, at 25°C. Sorption capacities of Cd and Pb increase as temperature rises. According to the thermodynamic parameters, the cadmium and lead adsorption process was spontaneous and endothermic. It was also found that pH has an important effect on the adsorption of these metals by CAB, as more were removed at pH values between 6 and 7.

scholarly journals The Enzymatic Decolorization of Textile Dyes by the Immobilized Polyphenol Oxidase from Quince Leaves

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Gulnur Arabaci ◽  
Ayse Usluoglu
Keyword(s):  
Polyphenol Oxidase ◽  
Calcium Alginate ◽  
Enzyme Stability ◽  
Industrial Effluent ◽  
Alginate Beads ◽  
Textile Dyes ◽  
Kinetic Properties ◽  
Synthetic Dyes ◽  
Cydonia Oblonga ◽  
Calcium Alginate Beads

Water pollution due to release of industrial wastewater has already become a serious problem in almost every industry using dyes to color its products. In this work, polyphenol oxidase enzyme from quince (Cydonia Oblonga) leaves immobilized on calcium alginate beads was used for the successful and effective decolorization of textile industrial effluent. Polyphenol oxidase (PPO) enzyme was extracted from quince (Cydonia Oblonga) leaves and immobilized on calcium alginate beads. The kinetic properties of free and immobilized PPO were determined. Quince leaf PPO enzyme stability was increased after immobilization. The immobilized and free enzymes were employed for the decolorization of textile dyes. The dye solutions were prepared in the concentration of 100 mg/L in distilled water and incubated with free and immobilized quince (Cydonia Oblonga) leaf PPO for one hour. The percent decolorization was calculated by taking untreated dye solution. Immobilized PPO was significantly more effective in decolorizing the dyes as compared to free enzyme. Our results showed that the immobilized quince leaf PPO enzyme could be efficiently used for the removal of synthetic dyes from industrial effluents.

scholarly journals Improving the Stability of Astaxanthin by Microencapsulation in Calcium Alginate Beads

PLoS ONE ◽  
2016 ◽  
Vol 11 (4) ◽  
pp. e0153685 ◽  
Author(s):  
Shen-Fu Lin ◽  
Ying-Chen Chen ◽  
Ray-Neng Chen ◽  
Ling-Chun Chen ◽  
Hsiu-O Ho ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Alginate Beads ◽  
Calcium Alginate Beads ◽  
The Stability

Calcium alginate beads motion in a foaming three-phase bubble column

2017 ◽  
Vol 324 ◽  
pp. 358-369 ◽  
Author(s):  
Gabriel Salierno ◽  
Mauricio Maestri ◽  
Stella Piovano ◽  
Miryan Cassanello ◽  
María Angélica Cardona ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Bubble Column ◽  
Alginate Beads ◽  
Calcium Alginate Beads ◽  
Three Phase

Size control of calcium alginate beads containing living cells using micro-nozzle array

Biomaterials ◽  
2005 ◽  
Vol 26 (16) ◽  
pp. 3327-3331 ◽  
Author(s):  
Shinji Sugiura ◽  
Tatsuya Oda ◽  
Yasuhiko Izumida ◽  
Yasuyuki Aoyagi ◽  
Mitsuo Satake ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Size Control ◽  
Alginate Beads ◽  
Living Cells ◽  
Calcium Alginate Beads ◽  
Micro Nozzle

ALLIINASE IMMOBILIZATION IN CALCIUM ALGINATE BEADS AND LAYERED DOUBLE HYDROXIDES MATRICES

2011 ◽  
Vol 36 (1) ◽  
pp. 12-20 ◽  
Author(s):  
ELENI ANIFANTAKI ◽  
ELEFTHERIOS TOULOUPAKIS ◽  
DEMETRIOS F. GHANOTAKIS
Keyword(s):  
Layered Double Hydroxides ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Calcium Alginate Beads ◽  
Double Hydroxides
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