Simultaneous reclaiming phosphate and ammonium from aqueous solutions by calcium alginate-biochar composite: Sorption performance and governing mechanisms

2022 ◽  
Vol 429 ◽  
pp. 132166
Author(s):  
Qianwei Feng ◽  
Miao Chen ◽  
Pan Wu ◽  
Xueyang Zhang ◽  
Shengsen Wang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Calcium Alginate

Facile Fabrication of ZIF-8/Calcium Alginate Microparticles for Highly Efficient Adsorption of Pb(II) from Aqueous Solutions

2019 ◽  
Vol 58 (16) ◽  
pp. 6394-6401 ◽  
Author(s):  
Yongcun Song ◽  
Nan Wang ◽  
Li-ye Yang ◽  
Yang−guang Wang ◽  
Di Yu ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Calcium Alginate ◽  
Highly Efficient ◽  
Facile Fabrication

scholarly journals Application of Saccharomyces cerevisiae/Calcium Alginate Composite Beads for Cephalexin Antibiotic Biosorption from Aqueous Solutions

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4728
Author(s):  
Lăcrămioara Rusu ◽  
Cristina-Gabriela Grigoraș ◽  
Andrei-Ionuț Simion ◽  
Elena Mirela Suceveanu ◽  
Daniela Șuteu ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Aqueous Solutions ◽  
Calcium Alginate ◽  
Low Cost ◽  
Natural Polymers ◽  
Initial Concentration ◽  
Biosorption Capacity ◽  
Composite Beads ◽  
Capacity Evaluation ◽  
Batch Biosorption

Cephalexin (CPX) is recognized as a water pollutant, and it has been listed in a number of countries with a risk factor greater than one. Herein, the present work focused on the synthesis, characterization and biosorption capacity evaluation of Saccharomyces cerevisiae immobilized in calcium alginate as a biosorbent to remove CPX from aqueous solutions. Biosorbent was characterized by SEM and FTIR techniques. Batch biosorption experiments were conducted in order to evaluate the effect of the initial pH, biosorbent dose and CPX initial concentration. The removal efficiency, in considered optimal conditions (pH = 4, CPX initial concentration = 30 mg/L, biosorbent dose = 1 g/L) was 86.23%. CPX biosorption was found to follow the pseudo–second-order kinetics. The equilibrium biosorption data were a good fit for the Langmuir model with correlation coefficient of 0.9814 and maximum biosorption capacity was 94.34 mg/g. This study showed that the synthesized biosorbent by immobilization technique is a low-cost one, easy to obtain and handle, eco-friendly, with high feasibility to remove CPX antibiotic from aqueous solution. The findings of this study indicate that the biosorbents based on microorganisms immobilized on natural polymers have the potential to be applied in the treatment of wastewater.

Synthesis of calcium alginate nanoparticles for removal of lead ions from aqueous solutions

2016 ◽  
Vol 89 (7) ◽  
pp. 1177-1182 ◽  
Author(s):  
Mohsen Khezri ◽  
Younos Jalilpour ◽  
Shiva Abedi ◽  
Hamid Reza Ashjari
Keyword(s):  
Aqueous Solutions ◽  
Calcium Alginate ◽  
Lead Ions

scholarly journals Use of Poly(vinyl alcohol)-Malic Acid (CLHPMA) Hydrogels and Chitosan Coated Calcium Alginate (CCCA) Microparticles as Potential Sorbent Phases for the Extraction and Quantitative Determination of Pesticides from Aqueous Solutions

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3993
Author(s):  
Cristian Valdés ◽  
Oscar Valdés ◽  
Daniel Bustos ◽  
Diana Abril ◽  
Gustavo Cabrera-Barjas ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Malic Acid ◽  
Vinyl Alcohol ◽  
Calcium Alginate ◽  
Crop Yields ◽  
Poly Vinyl Alcohol ◽  
Mechanical Agitation ◽  
Experimental Conditions ◽  
Desorption Process

Pesticides are used worldwide to increase crop yields in agriculture. However, their toxicity and accumulation capacity can make them toxic to the environment, animals and humans. In the case of workers chronically exposed to these substances, they must be sampled continuously, so urine is an excellent option. In this sense, this study proposes to use poly(vinyl alcohol)-malic acid hydrogels, and chitosan-coated calcium alginate as new sorbent phases to be used in pesticide determination processes in urine. To better understand the behavior of these materials in the capture and desorption process, molecular dynamics simulations (MDS) were used, and desorption experiments were performed, using mechanical agitation, ultrasound, and pH variation in the desorption process, in order to optimize the parameters to obtain better recoveries. Under the optimal experimental conditions, the maximum recoveries were of the order of 11% (CFN), 3% (KCF), 53% (DMT), 18% (MTD) and 35% (MTL). Although the recoveries were not exhaustive, they are a first approximation for the use of these new sorbent phases in the determination of this type of compound in aqueous solutions and urine.

scholarly journals Removal of As(V) from aqueous solutions using calcium-alginate microspheres with encapsulated iron nanoparticles

2021 ◽  
Author(s):  
María Soledad Ruiz-Mora ◽  
Ruth Alfaro-Cuevas-Villanueva ◽  
Verónica Martínez-Miranda ◽  
Orlando Hernández-Cristóbal ◽  
Raúl Cortés-Martínez
Keyword(s):  
Particle Size ◽  
Aqueous Solutions ◽  
Calcium Alginate ◽  
Iron Nanoparticles ◽  
Low Cost ◽  
Human Consumption ◽  
Batch Systems ◽  
Adsorption Capacities ◽  
Kinetic Rates ◽  
Kinetic Equilibrium

Abstract This work investigated As(V) removal from aqueous solutions using calcium alginate microspheres with encapsulated iron nanoparticles (FeNPs) in batch systems. The kinetic, equilibrium, and thermodynamic parameters of the adsorption process were evaluated. Adsorbents were characterized using Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, and Zeta Potential techniques. The FeNPs were obtained by a simple and low-cost method and they were successfully encapsulated and uniformly dispersed over the microspheres' surface. Significantly fast adsorption kinetic rates were observed due to microspheres' particle size and FeNPs encapsulation. The chemisorption mechanism was recognized in both adsorbate-adsorbent systems. The As(V) isotherms data suggested that the process is associated with heterogeneous adsorption. Available sorption sites with different adsorption energies were related to the functional groups involved in removing As(V), such as hydroxyl and carboxyl groups. Significantly high adsorption capacities were obtained for both materials, suggesting they can be competitive compared to conventional adsorbents, even at low FeNPs concentrations. Besides FeNPs encapsulation enhancing arsenate removal, higher adsorption was obtained at slightly acidic pH values and, together with their small particle size, suggests that the microspheres have a great potential to be used as arsenate adsorbents in the water treatment for human consumption.

scholarly journals Analysis of removal of cadmium by action of immobilized Chlorella sp. micro-algae in alginate beads

F1000Research ◽  
2018 ◽  
Vol 7 ◽  
pp. 54 ◽  
Author(s):  
Christian Valdez ◽  
Yomaira Perengüez ◽  
Bence Mátyás ◽  
María Fernanda Guevara
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Atomic Absorption ◽  
Calcium Alginate ◽  
Alginate Beads ◽  
Cadmium Removal ◽  
Initial Concentration ◽  
Calcium Alginate Beads ◽  
Chlorella Sp ◽  
Metabolic Systems

Cadmium (Cd) is a metal that can negatively interfere with the metabolic systems of living beings. The objective of this work was to evaluate the capacity for cadmium removal in aqueous solutions by immobilized Chlorella sp. in calcium alginate beads. Beads without Chlorella sp. were used as a control. All the treatments were established in triplicate for 80 min, at four concentrations of cadmium (0, 20, 100 and 200 ppm), taking samples of aqueous solution every 10 min, to be read using atomic absorption equipment. The study determined that the treatment of alginate beads with immobilized Chlorella sp. removed 59.67% of cadmium at an initial concentration of 20 ppm, this being the best removal result.

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