scholarly journals Removal of Lead from Water Using Calcium Alginate Beads Doped with Hydrazine Sulphate-Activated Red Mud as Adsorbent

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
A. Naga Babu ◽  
G. V. Krishna Mohan ◽  
K. Kalpana ◽  
K. Ravindhranath
Keyword(s):  
Red Mud ◽  
Calcium Alginate ◽  
Surface Characterization ◽  
Complete Removal ◽  
Alginate Beads ◽  
Lead Extraction ◽  
Kinetics Of Adsorption ◽  
Calcium Alginate Beads ◽  
Hydrazine Sulphate ◽  
Kinetics Of

Calcium alginate beads doped with hydrazine sulphate-treated red mud are investigated as adsorbent for extracting lead ions from water using batch methods of extraction. Different extraction conditions are optimised for maximum lead extraction. Substantial amount of lead is removed, and the adsorption ability is found to be 138.6 mg/g. Surface characterization using FTIR, EDX, and FESEM confirms that lead is “onto” the surface of the adsorbent. Thermodynamic parameters, adsorption isotherms, and kinetics of adsorption are analysed. Adsorption is “physisorption” in nature and spontaneous. The adsorbent developed can be regenerated using 0.1 M HCl. Thus regenerated adsorbent can be used as the adsorbent for further removal of lead at least 10 times, and this enables the complete removal of lead from water by repetitive use of the regenerated adsorbent. The beads facilitate the easy filtration. The methodology developed is successfully applied for removing lead from industrial waste waters.

scholarly journals INMOVILIZACIÓN DE LAS MICROALGAS Scenedesmus ovalternus (Scenedesmaceae) Y Chlorella vulgaris (Chlorellaceae) EN ESFERAS DE ALGINATO DE CALCIO

2016 ◽  
Vol 21 (2) ◽  
pp. 437-442
Author(s):  
Mario Andres Forero-Cujiño ◽  
Luis Carlos Montengro Ruiz ◽  
Gabriel Antonio Pinilla-Agudelo ◽  
Luz Marina Melgarejo-Muñoz
Keyword(s):  
Growth Rate ◽  
Population Density ◽  
Chlorella Vulgaris ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Calcium Alginate Beads ◽  
The Stability ◽  
Kinetics Of

<p>En este trabajo se describe la técnica de inmovilización de microalgas en esferas de alginato de calcio. Se emplearon las especies Scenedesmus ovalternus y Chlorella vulgaris, se determinó la estabilidad de las esferas, la cinética de crecimiento y la concentración de las microalgas en el interior de las esferas. Chlorella vulgaris alcanzó mayores densidades poblacionales y tasas de crecimiento más altas cuando se inmovilizó en concentraciones del 10 % v/v con el alginato (1,31*10<span>6 </span>cél/ml). Para Scenedesmus ovalternus se observó una mayor densidad poblacional y una mayor tasa de crecimiento cuando se inmovilizó en concentraciones del 20 % v/v (7,06*10<span>5 </span>cél/ml). Estos resultados son útiles para aplicaciones prácticas de las algas encapsuladas, tales como el biomonitoreo o la biorremediación.</p><p><strong>Immobilization of Microalgae<em> Scenedesmus ovalternus</em> (Scenedesmaceae) and <em>Chlorella vulgaris</em> (Chlorellaceae) in Calcium Alginate Beads</strong></p><p>This paper describes the immobilization technique of microalgae in calcium alginate beads. Scenedesmus ovalternus and Chlorella vulgaris species were used. The stability of beads, the kinetics of growth and the concentrations of microalgae inside the beads were determined. The higher density and the upper growth rate of Chlorella vulgaris occurred when it was immobilized in alginate at a concentration of 10 %v/v (1,31*10<span>6 </span>cél/ml). Scenedesmus ovalternus achieved a higher population density and an elevated growth rate when it was immobilized at a concentration of 20 % v/v (7,06*10<span>5 </span>cél/ml). These results are useful for subsequent applications of the encapsulated algae, such as biomonitoring and bioremediation.</p>

scholarly journals Investigating the Unexpected Behavior for the Release Kinetics of Brilliant Blue Encapsulated into Calcium Alginate Beads

2009 ◽  
Vol 12 (1) ◽  
pp. 69 ◽  
Author(s):  
Magdy M. Elnashar ◽  
Mohamed A. Yassin ◽  
Abou El-Fetouh Abdel Moneim ◽  
Elsayed M. Abdel Bary
Keyword(s):  
Calcium Alginate ◽  
Release Kinetics ◽  
Alginate Beads ◽  
Brilliant Blue ◽  
Unusual Behavior ◽  
Calcium Alginate Beads ◽  
Alginate Concentration ◽  
Optimum Formulation ◽  
Kinetics Of ◽  
Unexpected Behavior

This work is focused on investigating the unexpected behavior for the release kinetics of brilliant blue (BB) encapsulated into calcium alginate beads. By increasing the alginate concentration from 1-3% (w/v), the release of BB over time was found to follow two different behaviors. For the first two hours, the order was 1% &gt; 2% &gt; 3%, after which it was as follow: 1% &gt; 3% &gt; 2%. The unanticipated increase in BB release using 3% (w/v) alginate beads after two hours over that of 2% (w/v) alginate was examined by the swelling and bursting tests. The results were showing clear evidences by data and image the unusual behavior of 3% (w/v) alginate beads at two hours of swelling. This unexpected behavior for the 3% (w/v) alginate beads might be due to the higher osmotic pressure inside the beads. Overall, 2% (w/v) calcium alginate beads were considered to be the optimum formulation showing an excellent carrier for targeting drugs to the intestine, where the swelling of the beads were 60 % in the acidic medium, it was 5000 % in the alkaline medium.

scholarly journals Calcium Alginate Beads Doped with Nano-ZrO2 and Activated Carbon of Annona reticulate Plant as an Effective Adsorbent for Water Remediation of Chromium(VI)

2021 ◽  
Vol 33 (2) ◽  
pp. 281-290
Author(s):  
WONDWOSEN KEBEDE BIFTU ◽  
KUNTA RAVINDHRANATH
Keyword(s):  
Activated Carbon ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Water Remediation ◽  
Polluted Water ◽  
Isotherm Models ◽  
Kinetics Of Adsorption ◽  
Calcium Alginate Beads ◽  
Chromium Vi ◽  
Pseudo Second Order

An activated carbon produced from stems of Annona reticulate plant (SACAR) by conc. H2SO4 digestion, is observed to have strong affinity for toxic Cr(VI) ions. Its adsorptivity for Cr(VI) ions was enhanced by admixing it with ‘nano-ZrO2’ (Zr-SACAR)-synthesized adopting green methods. For ensuring easy filtration, the ‘active carbon + nanoparticle composite’ was immobilized in calcium alginate beads (Zr-SACAR-Ca). Optimum extraction conditions for these three adsorbents for the removal of Cr(VI) ions from water were investigated. The adsorption capacities were found to be 92.2 mg/g for SACAR; 109.83 mg/g for Zr-SACAR and 119.34 mg/g for Zr-SACAR-Ca. The sorption nature was characterized by XRD, FTIR, FESEM and EDX studies. The sorption mechanism was investigated using various isotherm models. Thermodynamic studies revealed the endothermic and spontaneous nature of sorption. The kinetics of adsorption was well defined by the pseudo-second-order model. The spent adsorbent are regenerated and reused until six cycles with marginal decrease in Cr-adsorptivity. The adsorbents developed are effectively applied in the treatment of polluted water samples collected from Ethiopia

SHRINKING KINETICS OF CALCIUM ALGINATE BEADS IN ALCOHOLIC SODA

1982 ◽  
Vol 15 (1-4) ◽  
pp. 197-206 ◽  
Author(s):  
F. FERRERO ◽  
P. CAMPAGNA ◽  
N. PICCrNINI
Keyword(s):  
Calcium Alginate ◽  
Alginate Beads ◽  
Calcium Alginate Beads ◽  
Kinetics Of

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.

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