Modeling of lead (II) adsorption on sodium hydroxide treated rice husk: Fixed-bed studies

Garba, Abdurrahman; Basri, Hatijah; Nasri, Noor Shawal; Siddiq, Umar Hayatu; Rahman, Abdul

doi:10.11113/mjfas.v13n4.754

Cited by 7 publications

(8 citation statements)

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“…Similar results were reported previously 23 also for the removal of Cr (VI) using thermally activated weed in a column study. From the values reported in the Table 5, it can be seen that with increase in initial concentration from 20 to 40 mg L −1 the equilibrium uptake capacity increased from 248 to 351 mg g −1 41 . This is in agreement with the experimental results obtained for the removal of hexavalent chromium 9,26 for removal of Ni(II) ions using modified rice straw.…”

Section: Resultssupporting

confidence: 88%

Adsorption of perchlorate by cationic modified adsorbent in a fixed bed continuous flow column

George¹,

Radhakrishnan²,

Nair³

2022

J of Chemical Tech & Biotech

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BACKGROUND: In the present investigation, rice husk modified by Cetyltrimethylammonium bromide (CTAB) was used for the adsorptive removal of perchlorate by fixed column experiments from aqueous solution. The performance of the cationic modified rice husk (MRH) was characterized by Fourier transform infrared analysis. Experiments were carried out in a properly designed test rig consisting of a fixed-bed column of the cationic MRH with provision for admitting variable flow rates of the adsorbate at specified concentrations. The experimental unit can vary the column heights of the adsorbent. RESULTS:The influence of parameters such as inlet perchlorate feed concentration, flow rate of feed and height of bed used was analyzed based on the breakthrough curves and saturation time of the cationic modified adsorbent. The ranges of parameters were determined from parameter optimization studies using several sets of batch experiments conducted during the course of the preliminary investigation in the study. The breakthrough curves obtained from the column studies on the adsorption of perchlorate on MRH at various conditions were analyzed using four different kinetic models and the experimental and model-predicted breakthrough curves were used to obtain the parameters of the adsorption process in the column. CONCLUSIONS: Adams-Bohart and ded depth service time (BDST) models fitted better in the initial period of the adsorption process. Different nonlinear statistical methods were used to evaluate the best model for the column performance in the adsorption of perchlorate in a cationic modified adsorbent.

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Section: Resultssupporting

confidence: 88%

Adsorption of perchlorate by cationic modified adsorbent in a fixed bed continuous flow column

George¹,

Radhakrishnan²,

Nair³

2022

J of Chemical Tech & Biotech

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“…The adsorption kinetics inside the packed bed is most commonly analyzed using the Thomas, bed depth service time (BDST), 78 the Adams‐Bohart (AB), 79 Yoon–Nelson (YN), Clark, 31,49 Wolborska, 80 and modified dose–response models. Thomas model (TM), 81 is the most general and widely used to analyze the kinetics of adsorption in the packed bed 19‐22,32‐34,37,39‐41,45,47,49,50,52‐54 . The TM was proposed based on the assumptions of Langmuir isotherm and the second‐order reversible reaction kinetics without dispersion.…”

Section: Theorymentioning

confidence: 99%

“…The Yoon–Nelson model (YNM) is simply a theoretical assumption and does not depend on adsorbate and adsorbent properties or the packed‐bed dimensions. Yoon–Nelson model is represented as 19‐22,24,33,37,40,45,47,50,52,53

\ln ((), \frac{C_{t}}{C_{0} - C_{t}}) = K_{YN} ((), t - t^{'}),

where K YN = YNM‐constant (min −1 ), and t′ = the required time for 50% adsorbate breakthrough (min). In the present context, depending on the fixed‐bed device's geometry and operational conditions, the experimental data were analyzed using the Thomas and YNMs.…”

Section: Theorymentioning

confidence: 99%

“…Therefore, an appropriate design of the fixed‐bed adsorption device is essential for separating the heavy metal with a higher removal capacity and efficiency. Some studies on the continuous mode Pb(II) adsorption, which were carried out in the packed bed of larger dimensions, are tabulated in Table S1 (Supporting information) 19‐56 . As mentioned in Table S1, the researchers have used larger columns (minimum height 1 cm) with a higher dose of adsorbent (minimum 1.0 g) to obtain the adsorption capacity as high as 115.20 mg g −1 .…”

Section: Introductionmentioning

confidence: 99%

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Lead adsorption in a serpentine millichannel‐based packed‐bed device: Effect of hydrodynamics and mixing characteristics

2021

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The present study depicts the hydrodynamics and the mixing characteristics in a millichannel‐based serpentine fixed‐bed device to attain the particular demands of the miniature adsorption devices' fabrication. Residence time distribution analyses were accomplished to analyze the velocity distribution inside the packed bed geometry. The effects of operating variables on the system hydrodynamics and mixing and their impact on the lead adsorption characteristics were enunciated. New correlations were proposed for the frictional resistance and axial dispersion of the fluid. The parametric effects on the lead ions [Pb(II)] adsorption were studied in the same millichannel geometry packed with the graphene oxide coated glass beads. The kinetics of the adsorptive removal process is assessed by the Thomas model and the Yoon–Nelson model. The regeneration study of the said millichannel‐based fixed‐bed device was also executed.

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“…Adsorption techniques for dyes using agricultural materials was much preferred over all the other methods of removal. This could be attributed to the advantages of the process which it is effective, cheap, flexible, simplicity of design, insensitivity to toxic pollutants, and the procedure is easy to undertake [9]. But, the cost of producing commercial activated carbons is high which made scientist to look for alternative precursor materials that are cheaper, sustainable, and easy to regenerate [10,11].…”

mentioning

confidence: 99%

Adsorption of Methylene Blue Using Activated Carbon Made from Watermelon Rinds

Garba

Tahir

Yusuf

2021

JSMPM

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This work reports the possibility of using sustainable waste from watermelon rinds as a potential candidate for the removal of Methylene Blue (MB) from aqueous solution in batch mode. The adsorbent was characterized by FTIR and SEM where the FTIR analysis shows peaks at 3370 cm-1 that corresponds to –OH stretching vibration for lignin, pectin and cellulose, at 1728 cm-1 corresponds to –C=O stretching of esters, carboxylic acids, and as well peak in the range of 1350 – 1000 cm-1 which indicates stretching vibration of alcohols and carboxylic acids. The availability of hydroxyl and carboxyl groups enhance high MB uptake at lower pH. The SEM image of raw adsorbent shows no development of pores, but after carbonization the pores were developed due to escape of volatile groups during carbonization and activation process. Adsorption studies using batch mode were performed by varying adsorption parameters such as adsorbent dosage, contact time, pH of the solution and initial dye concentration. The maximum capacity of the adsorbent was found to be 0.4g dosage, pH 4, 20mg/L of initial MB concentration and 60 minutes contact time that removes maximum of 197.5 mg g-1. The results indicated that watermelon rind is a successful agricultural waste that could be utilized for sustainable removal of cationic dyes in aqueous solutions.

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Modeling of lead (II) adsorption on sodium hydroxide treated rice husk: Fixed-bed studies

Cited by 7 publications

References 0 publications

Adsorption of perchlorate by cationic modified adsorbent in a fixed bed continuous flow column

Adsorption of perchlorate by cationic modified adsorbent in a fixed bed continuous flow column

Lead adsorption in a serpentine millichannel‐based packed‐bed device: Effect of hydrodynamics and mixing characteristics

Adsorption of Methylene Blue Using Activated Carbon Made from Watermelon Rinds

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