Removal of Hexavalent Chromium from Aqueous Solution Using Unmodified Saw Dust: Batch and Column Studies

Tsamo, Cornelius; Bachirou, I.; Inna, Samomssa; Fouogoung, T. B.

doi:10.9734/cjast/2019/46153

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…e slight increase, however, may be due to the creation of new active sites resulting from heating. is may equally be resulting from the acceleration of some originally slow adsorption steps, enhancing the mobility of adsorbate from the bulk solution towards the adsorbent surface [50]. e negative ∆G°values show that Co(II) adsorption on DNL is spontaneous, and the International Journal of Chemical Engineering overall process is endothermic as evident from the positive enthalpy value.…”

Section: Resultsmentioning

confidence: 99%

“…e decreasing values of Jovanovic constant (K J ) with increasing initial concentration (0.120 at 10 mg/L, 0.011 at 100 mg/L, and 0.002 at 500 mg/L) indicate that with increasing initial concentration there is very little contact time between Co(II) and DNL before adsorption. At higher initial concentrations, there is an important driving force due to the increased concentration necessary to overcome all mass transfer resistances of the pollutant between the aqueous and solid phases thus increasing the adsorption [50]. All surface coverage values were calculated using adsorption capacities from this model.…”

Section: Two-parameter Isothermsmentioning

confidence: 99%

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One-, Two-, and Three-Parameter Isotherms, Kinetics, and Thermodynamic Evaluation of Co(II) Removal from Aqueous Solution Using Dead Neem Leaves

Tsamo

Paltahe

Fotio

et al. 2019

International Journal of Chemical Engineering

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Water pollution by heavy metals like Co(II) is particularly of concern because of their persistence in the environment, toxicity, and ability to bioaccumulate in organisms. In this study, the influence of contact time at three initial concentration, pH, adsorbent dose, temperature, and kinetics, thermodynamics, and one-, two-, and three-parameter isotherm modeling of the adsorption of Co(II) on neem leaves (DNL) was investigated. e adsorbent was characterized using FTIR, TGA-DSC, EDX, and nitrogen adsorption-desorption. DNL is composed of many Co(II) surface-binding groups and a BET surface area of 0.2783 m 2 /g dominated by meso-and macropores. Equilibrium was attained in 10 minutes for the three concentrations with a removal efficiency of 85-97%. ∆G°of − 5.424 to − 6.068 KJ/mol at 25 to 60°C, respectively, indicated spontaneous adsorption with increasing temperature. D-R adsorption energies of 0.649 to 2.433 KJ/mol revealed physical adsorption. Maximum adsorption capacity of 9.201-523.900 mg/g was obtained by Freundlich and Jovanovic isotherms. Adsorption was very favourable as evident by the high Kiselev equilibrium constant (11.652-172.78 L/mg) and very low R L values of 0.001-0.026. Adsorption occurred by repulsive mechanism as indicated by Fowler-Guggenheim and Hill-de Boer negative interaction energies (− 16.182 to − 90.163 and − 111.102 to − 3328.86 KJmol − 1 , respectively), confirming maximum Co(II) adsorption at pH 3. Results can be used in the design of an efficient adsorption system using neem leaves which is very efficient in removing low and high levels of heavy metals like cobalt ions from wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Two-parameter Isothermsmentioning

confidence: 99%

One-, Two-, and Three-Parameter Isotherms, Kinetics, and Thermodynamic Evaluation of Co(II) Removal from Aqueous Solution Using Dead Neem Leaves

Tsamo

Paltahe

Fotio

et al. 2019

International Journal of Chemical Engineering

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“…Langmuir isotherm: This model is very useful to describe the monolayer adsorption of a solute on the surface of an adsorbent and also applies in the case of chemisorption and physisorption [15]. The linear form of this equation is given in Eq (7): (7) qe = quantity adsorbed per unit mass of the adsorbent (mg/g); Ce = concentration of the adsorbate at equilibrium (mg/L); qm = maximum quantity adsorbed per unit mass of the adsorbent (mg/g); b : Langmuir constant.…”

Section: Modeling Of Adsorption Isothermsmentioning

confidence: 99%

“…Freundlich isotherm: This model is also used when the adsorbent has a heterogeneous adsorption surface i.e. the adsorption sites are energetically different [15]. Its linear form of the Freundlich equation is as follows (Equation 9):…”

Section: Modeling Of Adsorption Isothermsmentioning

confidence: 99%

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Batch mode treatment of wastewater from the Maroua artisanal tannery using silica extracted from rice husks and silica/sand mixture

Dikdim¹,

Djinsi²,

Tsamo³

2022

equilibrium

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ABSTRACT. Tanning activity consumes high volumes of water resulting in large volumes of highly colored polluted wastewater being discharged to the environment. In this study, the discoloration of the wastewater of the local artisanal tannery using SiO2 synthesized from rice husks and silica/sand mixture at different process conditions was investigated. The results revealed that the discoloration process is favorable for both adsorbents at 35oC with maximum of 61% for sand/SiO2 mixture system and 64% for SiO2 system. The presence of NaCl electrolyte enhanced the discoloration for both adsorbents increasing from 44% for sand/SiO2 mixture at 0 NaCl to 72% at 0.5M NaCl and from 49% for SiO2 system at 0 NaCl to 63 % at 0.5M NaCl. Increasing the amount of sand from 0.2 to 1 g at fixed SiO2 of 0.1 g in sand/SiO2 mixture showed discoloration from 40-41 % while increasing SiO2 in SiO2 alone system from 0.05 to 0.5 g had a discoloration of 45-71%. Results of this study shows that sand a very abundant local and worldwide material can be complemented with silica in a very low cost tannery wastewater discoloration process.Keywords:Tannery, Wastewater, Silica, Sand, Discoloration

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Potential of Fish Scale Biochar Nanocomposite with ZnO for Effective Sequestration of Cr (VI) from Water: Modeling and Kinetics

et al. 2022

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Removal of Hexavalent Chromium from Aqueous Solution Using Unmodified Saw Dust: Batch and Column Studies

Cited by 9 publications

References 15 publications

One-, Two-, and Three-Parameter Isotherms, Kinetics, and Thermodynamic Evaluation of Co(II) Removal from Aqueous Solution Using Dead Neem Leaves

One-, Two-, and Three-Parameter Isotherms, Kinetics, and Thermodynamic Evaluation of Co(II) Removal from Aqueous Solution Using Dead Neem Leaves

Batch mode treatment of wastewater from the Maroua artisanal tannery using silica extracted from rice husks and silica/sand mixture

Potential of Fish Scale Biochar Nanocomposite with ZnO for Effective Sequestration of Cr (VI) from Water: Modeling and Kinetics

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