Biosorption of lanthanum using sericin/alginate/polyvinyl alcohol beads as a natural cation exchanger in a continuous fixed-bed column system

2021 ◽  
pp. 127233
Author(s):  
Talles Barcelos da Costa ◽  
Meuris Gurgel Carlos da Silva ◽  
Melissa Gurgel Adeodato Vieira
Keyword(s):  
Polyvinyl Alcohol ◽  
Cation Exchanger ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Column System

scholarly journals Sorption of Ag+ and Cu2+ by Vermiculite in a Fixed-Bed Column: Design, Process Optimization and Dynamics Investigations

2018 ◽  
Vol 8 (11) ◽  
pp. 2221 ◽  
Author(s):  
Olga Długosz ◽  
Marcin Banach
Keyword(s):  
Flow Rate ◽  
Continuous Process ◽  
Fixed Bed ◽  
Copper Ion ◽  
Cost Effective ◽  
Breakthrough Curves ◽  
Fixed Bed Column ◽  
Column System ◽  
Total Percentage ◽  
Bed Height

Vermiculite has been used for the removal of Cu 2 + and Ag + from aqueous solutions in a fixed-bed column system. The effects of initial silver and copper ion concentrations, flow rate, and bed height of the adsorbent in a fixed-bed column system were investigated. Statistical analysis confirmed that breakthrough curves depended on all three factors. The highest inlet metal cation concentration (5000 mg/dm3), the lowest bed height (3 cm) and the lowest flow rate (2 and 3 cm3/min for Ag + and Cu 2 + , respectively) were optimal for the adsorption process. The maximum total percentage of metal ions removed was 60.4% and 68.7% for Ag+ and Cu2+, respectively. Adsorption data were fitted with four fixed-bed adsorption models, namely Clark, Bohart–Adams, Yoon–Nelson and Thomas models, to predict breakthrough curves and to determine the characteristic column parameters. The adsorbent was characterized by SEM, FTIR, EDS and BET techniques. The results showed that vermiculite could be applied as a cost-effective sorbent for the removal of Cu 2 + and Ag + from wastewater in a continuous process.

scholarly journals Batch and fixed-bed column study for p-nitrophenol, methylene blue, and U(VI) removal by polyvinyl alcohol–graphene oxide macroporous hydrogel bead

2017 ◽  
Vol 77 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Dan Chen ◽  
Jun Zhou ◽  
Hongyu Wang ◽  
Kai Yang
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Polyvinyl Alcohol ◽  
Fixed Bed ◽  
Column Experiments ◽  
Maximum Adsorption Capacity ◽  
Fixed Bed Column ◽  
Hydrogel Bead ◽  
Bdst Model ◽  
Adsorption Capacities

Abstract There is an increasing need to explore effective and clean approaches for hazardous contamination removal from wastewaters. In this work, a novel bead adsorbent, polyvinyl alcohol–graphene oxide (PVA-GO) macroporous hydrogel bead was prepared as filter media for p-nitrophenol (PNP), dye methylene blue (MB), and heavy metal U(VI) removal from aqueous solution. Batch and fixed-bed column experiments were carried out to evaluate the adsorption capacities of PNP, MB, and U(VI) on this bead. From batch experiments, the maximum adsorption capacities of PNP, MB, and U(VI) reached 347.87, 422.90, and 327.55 mg/g. From the fixed-bed column experiments, the adsorption capacities of PNP, MB, and U(VI) decreased with initial concentration increasing from 100 to 400 mg/L. The adsorption capacities of PNP, MB, and U(VI) decreased with increasing flow rate. Also, the maximum adsorption capacity of PNP decreased as pH increased from 3 to 9, while MB and U(VI) presented opposite tendencies. Furthermore, the bed depth service Time (BDST) model showed good linear relationships for the three ions' adsorption processes in this fixed-bed column, which indicated that the BDST model effectively evaluated and optimized the adsorption process of PVA-GO macroporous hydrogel bead in fixed-bed columns for hazardous contaminant removal from wastewaters.

scholarly journals Removal and Recovery of Silver by Dynamic Adsorption on Bentonite Clay Using a Fixed-Bed Column System

2015 ◽  
Vol 33 (2) ◽  
pp. 91-103 ◽  
Author(s):  
M. L. Cantuaria ◽  
E. S. Nascimento ◽  
A. F. Almeida Neto ◽  
O. A. A. dos Santos ◽  
M. G. A. Vieira
Keyword(s):  
Fixed Bed ◽  
Bentonite Clay ◽  
Dynamic Adsorption ◽  
Fixed Bed Column ◽  
Column System ◽  
Removal And Recovery

scholarly journals Adsorption of 2,4-dichlorophenoxyacetic acid using rice husk biochar, granular activated carbon, and multi-walled carbon nanotubes in a fixed bed column system

2018 ◽  
Vol 78 (8) ◽  
pp. 1812-1821 ◽  
Author(s):  
Mehdi Bahrami ◽  
Mohammad Javad Amiri ◽  
Bahareh Beigzadeh
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbon ◽  
Flow Rate ◽  
Fixed Bed ◽  
Dichlorophenoxyacetic Acid ◽  
Fixed Bed Column ◽  
Column System ◽  
Multi Walled Carbon Nanotubes ◽  
2,4 Dichlorophenoxyacetic Acid ◽  
Walled Carbon Nanotubes

Abstract The 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide, as an aromatic hydrocarbon, is a dangerous and toxic organic pollutant among the agricultural pesticides. In this research, the performance of the biochar made from rice husk (BRH), granular activated carbon (GAC), and multi-walled carbon nanotubes (MWCNTs) was investigated for adsorption of 2,4-D in a fixed-bed column system. The influence of pH (2, 5, 7, 9), flow rate (0.5, 1, 1.5 mL min−1), bed depth (3, 6, 9 cm), and influent 2,4-D concentration (50, 100, 150, 300 mg L−1) on the adsorption process was evaluated. The resulting breakthrough curves indicated that the higher removal efficiency of 2,4-D took place at the lower flow rate, lower influent 2,4-D concentration, higher bed depth, and lower pH. While in most cases the removal ability of GAC was better than other adsorbents, generally, this study confirmed that the BRH, as a cheap and sustainable material, can be a viable alternative to GAC and MWCNTs for remediation and treatment scenarios, particularly in developing countries.

scholarly journals Removal of Cadmium from Aqueous Solutions by Saccharomyces cerevisiae–Alginate System

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4128
Author(s):  
Silvia Carolina Moreno Rivas ◽  
Rosa Idalia Armenta Corral ◽  
María del Carmen Frasquillo Félix ◽  
Alma Rosa Islas Rubio ◽  
Luz Vázquez Moreno ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Fixed Bed ◽  
Alginate Beads ◽  
Fixed Bed Column ◽  
Removal Capacity ◽  
Column System ◽  
Low Concentrations ◽  
Negative Surface ◽  
Negative Surface Charge ◽  
Efficient Option

The aim of this study was to determine the Cd2+ removal capacity of a biosorbent system formed by Saccharomyces cerevisiae in calcium alginate beads. The adsorption of Cd2+ by a S. cerevisiae–alginate system was tested either by batch or fixed-bed column experiments. The S. cerevisiae–alginate system was characterized using dynamic light scattering (DLS, zeta potential), size, hardness, scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy. Beads of the S. cerevisiae–alginate system showed a spherical–elliptical morphology, diameter of 1.62 ± 0.02 mm, 96% moisture, negative surface charge (−29.3 ± 2.57 mV), and texture stability during storage at 4 °C for 20 days. In batch conditions, the system adsorbed 4.3 µg of Cd2+/g of yeast–alginate beads, using a Cd2+ initial concentration of 5 mg/L. Adsorption capacity increased to 15.4 µg/g in a fixed-bed column system, removing 83% of total Cd2+. In conclusion, the yeast–alginate system is an efficient option for the removal of cadmium at low concentrations in drinking water.

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