Removal of Steriod Hormones by Activated Carbon Adsorption—Kinetic and Thermodynamic Studies

Ifelebuegu, Augustine O.

doi:10.4236/jep.2012.36057

Cited by 25 publications

(25 citation statements)

References 24 publications

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“…Adsorption kinetics is one of the most crucial factors in the design of adsorption During the design and optimization of full scale applications, adsorption kinetics is essential in choosing optimum operating conditions and examining potential rate controlling mechanism [60,61]. Adsorption mechanism of phosphate from aqueous solution was investigated using various kinetic models; pseudo first order, pseudo second order, Elovich, and Bangham's kinetic models were used in this study.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

“…The adsorption mechanism of solute onto adsorbent can be described using the intra particle diffusion kinetic model expressed as [61]:…”

Section: Intra-particle Diffusion Kineticsmentioning

confidence: 99%

“…The profile shows a multi-step process, where the initial section may be considered as an area of fast uptake as a result of the boundary layer diffusion on the surface of the pellet and the middle section is the stage limited by intra particle diffusion [66]. The last stage is shows a decreasing adsorption due to low residual phosphate concentration in the solution [61,66].…”

Section: Intra-particle Diffusion Kineticsmentioning

confidence: 99%

“…Adsorption isotherms help to model design parameters and to understand the distribution of adsorbate between the aqueous and solid phase [61]. The equilibrium data was analyzed using Langmuir, Freundlich, Tempkin, and Dubinin-Radushkeivich isotherm models.…”

Section: F Adsorption Isothermsmentioning

confidence: 99%

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The Adsorptive Properties of Fired Clay Pellets for the Removal of Phosphate in Wastewater Treatment

Wood¹,

Augustine²,

Mark³

et al. 2016

Fourth International Conference on Advances in Bio-Informatics, Bio-Technology and Environmental Engineering - ABBE 2016

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Abstract-Removal of phosphate in wastewater treatment is crucial to reducing nutrient enrichment and eutrophication of aquatic bodies. This study explored the potential of fired clay pellets for use in phosphate removal during wastewater treatment. The mechanism of removal was evaluated in a batch adsorption study under different experimental conditions. Fired clay pellets were found to be effective in the adsorptive removal of phosphate from aqueous solution with a maximum adsorption capacity of 144mg/g. The experimental data showed a good fit to the pseudo-first-order kinetic model indicating a physical nature of the sorption process and also followed Dubinin-Radushkeivich Isotherm model. Adsorption of phosphate favoured acidic pH with optimum removal at pH 3-4. The values of Gibbs free energy (-16.5 kJ/mol), enthalpy (-8.87 kJ/mol) indicated adsorption was spontaneous and exothermic. The mechanism was found to be predominantly physisorption supported by some diffusion.

show abstract

Section: Adsorption Kineticsmentioning

confidence: 99%

“…The adsorption mechanism of solute onto adsorbent can be described using the intra particle diffusion kinetic model expressed as [61]:…”

Section: Intra-particle Diffusion Kineticsmentioning

confidence: 99%

Section: Intra-particle Diffusion Kineticsmentioning

confidence: 99%

Section: F Adsorption Isothermsmentioning

confidence: 99%

See 2 more Smart Citations

The Adsorptive Properties of Fired Clay Pellets for the Removal of Phosphate in Wastewater Treatment

Wood¹,

Augustine²,

Mark³

et al. 2016

Fourth International Conference on Advances in Bio-Informatics, Bio-Technology and Environmental Engineering - ABBE 2016

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“…The treatment of the black tea leaves and the batch adsorption experiments have been previously described by Ifelebuegu et al [17]. The characteristics of the GAC used have been reported elsewhere [9].…”

Section: A Materialsmentioning

confidence: 99%

An Evaluation of the Removal of Progesterone in Wastewater by Adsorption onto Waste Tea Leaves

Osamor¹,

Noble²

2016

Fourth International Conference on Advances in Applied Science and Environmental Technology- ASET 2016

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The removal of endocrine disrupting chemical progesterone by adsorption onto waste black tea leaves was investigated in laboratory-scale experiments. The removal efficiency was compared with the widely used granular activated carbon (GAC). The performance of waste black tea leaves for the adsorption of progesterone was found to be comparable to conventional GAC. The maximum adsorption capacities for tea leaves and GAC were 1.8 mg/g and 1.4 mg/g respectively. The values for the thermodynamic parameters associated with sorption of progesterone onto tea leaves were Gibb's free energy (-6.0 KJ/mol), enthalpy (-3.7 KJ/ mol) and entropy (8.0 J/mol K), indicating that the sorption process was favorable, spontaneous and involved physical adsorption held by Van der Waal forces. The adsorption was guided by diffusion within the pores of the tea leaves.

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The adsorptive behaviour of electrospun hydrophobic polymers for optimized uptake of estrogenic sex hormones from aqueous media: kinetics, thermodynamics, and reusability study

Yasir

Ngwabebhoh

Šopík

et al. 2022

J of Chemical Tech & Biotech

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Background: Estrogenic hormones as micropollutants in water systems cause severe adverse effects on human health and marine life, leading to fatal diseases, such as breast, ovarian, and prostate cancer. Electrospun polymers have proven high stability and impressive performance in adsorption removal. In this study, electrospun polysulfone (PSU), polyvinylidene fluoride, and polylactic acid were prepared and characterized using scanning electron microscope (SEM), fourier-transform intrared spectroscopy (FTIR), thermogravimetric analysis (TGA), Brunauer Emmett Teller (BET), surface area measurement X-Ray diffraction (XRD), and porometry.Results: Nanofibers possess a mean fiber diameter of 149-183 nm and a specific surface area of 1.6-6.3 m 2 /g. The adsorption efficiency of the simultaneous removal of estrone (E1), 17⊎-estradiol (E2), estriol (E3), and 17⊍-ethinylestradiol (EE2) in a mixed concentration was investigated using high performace liquid chromatography (HPLC). The results indicate that spun PSU fibers exhibited the highest removal of all four estrogens, with a maximum removal efficiency of 71.2%, 65.9%, 56.9%, and 36.1% and adsorption capacity of 0.508, 0.703, 0.550, and 0.354 mg/g for E1, EE2, E2, and E3, respectively. Additionally, the adsorption was optimised by varying parameters, such as concentration of adsorbate, pH, adsorbent dosage, and temperature, to statistically analyse one-way variance using ANOVA. The pseudo-second-order is best fitted for E1, EE2, and E2, while the pseudofirst-order is best for E3. The Langmuir-Freundlich isothermal model was most suitable for evaluation, and the thermodynamics depicted the adsorption to be exothermic and spontaneous. Conclusion:The results indicate that spun PSU can be an efficient adsorbent in the simultaneous elimination of estrogens from wastewater and it exhibits a high regeneration performance of over 60% after six adsorption-desorption cycles.

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Removal of Steriod Hormones by Activated Carbon Adsorption—Kinetic and Thermodynamic Studies

Cited by 25 publications

References 24 publications

The Adsorptive Properties of Fired Clay Pellets for the Removal of Phosphate in Wastewater Treatment

The Adsorptive Properties of Fired Clay Pellets for the Removal of Phosphate in Wastewater Treatment

An Evaluation of the Removal of Progesterone in Wastewater by Adsorption onto Waste Tea Leaves

The adsorptive behaviour of electrospun hydrophobic polymers for optimized uptake of estrogenic sex hormones from aqueous media: kinetics, thermodynamics, and reusability study

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