Decolorization of synthetic dye wastewater using packed bed electro-adsorption column

In the present study, Glycyrrhiza glabra residues (GGR) were used for the preparation of activated carbon, with a surface area of 959.22 m 2 g −1 . Activated carbon was prepared through chemical activation using ZnCl 2 at optimum carbonization temperature, and impregnation ratio for nitrate, and phosphate removal. The effect of contact time and adsorbent dosage on the removal efficiency was investigated, and the pseudo-second-order kinetic model correlated well with the adsorption data. The response surface methodology was applied for the determination of the effect of initial concentration, pH, and temperature and their interaction on the removal efficiency in the batch adsorption system. The Langmuir isotherm generated a satisfactory fit with the experimental data, and the maximum adsorption capacity was 142.5 mg g −1 at 308 K and 92.5 mg g −1 at 298 K for nitrate and phosphate removal, respectively. The high adsorption capacity reveals the applicability of the GGR activated carbon for nitrate and phosphate removal. Furthermore, the fixed-bed column adsorption studies were carried out, and the effect of flow rate and influent concentration on the behavior of the breakthrough curve was studied. The breakthrough time decreased by increasing the flow rate and inlet concentration. The Thomas and Yoon-Nelson models were suitable models for the design of GGR activated carbon fixed-bed column. The LUB of 0.44 cm and 4.35 cm was obtained for nitrate and phosphate with the inlet concentration of 20 mg L −1 and a flow rate of 40 mL min −1 , respectively. GGR is a new adsorbent that has not been previously utilized for adsorption of phosphate and nitrate.

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“…4 and t s (the time equivalent for a total capacity of the adsorption bed) was obtained from Eq. 5 [33,34].…”

Section: Fixed-bed Adsorptionmentioning

confidence: 99%

Activated carbon produced from Glycyrrhiza glabra residue for the adsorption of nitrate and phosphate: batch and fixed-bed column studies

et al. 2020

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“…The fixed-bed column studies at different influent flow rates, bed height, and initial concentration determine the efficient retention time [51] of the adsorbate from the achieved breakthrough curves. The effect of batch adsorption and ultrasonication showed that Ni@PP has better efficiency for DBT adsorption.…”

Section: Fixed-bed Column Studiesmentioning

confidence: 99%

“…The Thomas model [52] is mostly used to study the secondorder reaction kinetics and adsorption data obeying Langmuir adsorption isotherm. The major objective for the Thomas model is to find the maximum capacity, rate constant, and deposition of adsorbate concentration during the adsorption [51]. The linearized form of the model is specified in Eq.…”

Section: Fixed-bed Column Studiesmentioning

confidence: 99%

Desulfurization studies of liquid fuels through nickel-modified porous materials from Pongamia pinnata

Zaidi

Sorokhaibam

2020

Appl Petrochem Res

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A new biomass-based carbonaceous adsorbent has been developed from Pongamia pinnata and its effect upon nickel modification- and adsorption-coupled ultrasonication was investigated. Adsorption experiment of the model oil constituting 50 ppm dibenzothiophene in cyclohexane showed the maximum capacity as 8.11, 13.36, and 17.15 mg·g−1 for the commercial carbon DARCO, virgin bio-adsorbent PP, and nickel-modified adsorbent Ni@PP, respectively, with the time required for attaining equilibrium being the fastest in Ni@PP (120 min). The significant effect of ultrasonication was in attaining faster kinetics where ~ 96–98% removal was achieved in only 30 min. Also, the developed adsorbents had a very good specific surface area of 915 and 677 m2·g−1, respectively, for PP and Ni@PP. Investigation of the effect of higher initial sulfur concentration (200 ppm) indicated the significance of Ni modification, where a very high capacity of 66.18 mg·g−1 for Ni@PP was attained against 30.90 mg·g−1 for PP and 13.18 mg·g−1 for DARCO. Ni@ PP was also effective for the simultaneous removal of more refractory sulfur fractions from multicomponent model fuel systems and exhibited good regeneration ability till the fourth cycles or more. Cost estimation showed that the developed adsorbents are relatively ten times cheaper than commercial carbon, while the fixed-bed study indicated a breakthrough time of 250 min and 270 min for PP and Ni@PP, respectively. Graphic abstract

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“…The adsorption operation in a fixed‐bed column has been highlighted because it is one of the most effective methods to remove several pollutants from industrial effluents 11–15; besides, it is a technique of low cost and with an easy scale‐up design. Between the various types of adsorbent materials developed for this purpose, chitosan has become relevant because it presents characteristics of an efficient adsorbent 16–20.…”

Section: Introductionmentioning

confidence: 99%

Chitosan‐Coated Glass Beads in a Fluidized Bed for Use in Fixed‐Bed Dye Adsorption

et al. 2021

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The effects of the inlet air temperature and two chitosan solutions, pure or with coating auxiliaries, on the coating efficiency of glass beads in a fluidized bed were analyzed. The coated beads were used in a fixed‐bed column for adsorption of reactive black 5 dye in aqueous solution, and the effects of the pH and the coating solution formulation on the adsorption capacity were investigated. The glass bead coating process reached higher efficiencies at an air temperature of 80 °C with pure chitosan solution. The highest adsorption capacities were found at pH 3, using the beads coated with pure chitosan solution. All dynamic adsorption models were suitable to represent the breakthrough curves. The high values found for the coating efficiency and adsorption capacity prove these methods to be promising in dye adsorption.

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Decolorization of synthetic dye wastewater using packed bed electro-adsorption column

Cited by 23 publications

References 41 publications

Activated carbon produced from Glycyrrhiza glabra residue for the adsorption of nitrate and phosphate: batch and fixed-bed column studies

Activated carbon produced from Glycyrrhiza glabra residue for the adsorption of nitrate and phosphate: batch and fixed-bed column studies

Desulfurization studies of liquid fuels through nickel-modified porous materials from Pongamia pinnata

Chitosan‐Coated Glass Beads in a Fluidized Bed for Use in Fixed‐Bed Dye Adsorption

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