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

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.

Download Full-text

Kinetic Investigation of Hg(II) Photoreduction using TiO2-immobilized on Calcium Alginate Beads: Effect of Ferric ion and Organic Compound

Int'l Conf. on Chemical Engineering & Advanced Computational Technologies (ICCEACT’2014) Nov. 24-25, 2014 Pretoria (South Africa) ◽

10.15242/iie.e1114006 ◽

2014 ◽

Keyword(s):

Organic Compound ◽

Calcium Alginate ◽

Alginate Beads ◽

Ferric Ion ◽

Kinetic Investigation ◽

Calcium Alginate Beads

Download Full-text

Preservation of viability and antibacterial activity of Lactobacillus spp. in calcium alginate beads

European Journal of Pharmaceutical Sciences ◽

10.1016/j.ejps.2010.08.008 ◽

2010 ◽

Vol 41 (5) ◽

pp. 589-596 ◽

Cited By ~ 27

Author(s):

Mariya I. Brachkova ◽

Maria A. Duarte ◽

João F. Pinto

Keyword(s):

Antibacterial Activity ◽

Calcium Alginate ◽

Alginate Beads ◽

Calcium Alginate Beads ◽

Lactobacillus Spp

Download Full-text

New approach to encapsulation of Trametes versicolor in calcium alginate beads: a promising biological pretreatment method for enhanced anaerobic digestion

Biomass Conversion and Biorefinery ◽

10.1007/s13399-021-01606-7 ◽

2021 ◽

Author(s):

Omer Uzun ◽

Orhan Ince ◽

E. Gozde Ozbayram ◽

Çağrı Akyol ◽

Bahar Ince

Keyword(s):

Anaerobic Digestion ◽

Calcium Alginate ◽

Trametes Versicolor ◽

Alginate Beads ◽

Biological Pretreatment ◽

New Approach ◽

Pretreatment Method ◽

Calcium Alginate Beads

Download Full-text

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

The Scientific World JOURNAL ◽

10.1155/2014/685975 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5 ◽

Cited By ~ 10

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.

Download Full-text