Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Ajenifuja, Emmanuel; Ajao, J. A.; Ajayi, E. O. B.

doi:10.1007/s13201-017-0527-3

Cited by 58 publications

(32 citation statements)

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“…The Freundlich fitting gives a 1/n value of 0.63 (n = 1.58 > 1), indicating a moderate affinity and physical adsorption between metaldehyde and PAC, since Ajenifuja et al argued that the adsorption is a physical process when n > 1. 31 The K F from the fitting is 0.11 μg mg −1 (μg −1 L) 1/n obtained from the intercept. However, compared to the K F value of 2.5 mg g −1 (mg −1 L) 1/n in the study of Kumar et al which is considered high and suggests effective adsorption, 19 the K F here is too low and it cannot explain the experimental result of the effective metaldehyde removal.…”

Section: View Article Onlinementioning

confidence: 99%

Investigation of metaldehyde removal by powdered activated carbon from different water samples

Guo

et al. 2020

Environ. Sci.: Water Res. Technol.

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Metaldehyde as a widely used pesticide has been detected in surface water and drinking water in the UK with concentrations higher than the EU and UK standard (0.1 μg L −1 ). Previous studies have shown that powdered activated carbon (PAC) can adsorb metaldehyde even with the presence of natural organic matter, suggesting a promising solution to the problem. This paper studies the adsorption of metaldehyde onto PAC using different water samples including synthetic water, natural surface water, and water samples taken at different treatment processes from a water treatment plant. Metaldehyde (5 μg L −1 ) was effectively removed by PAC (50 mg L −1 ) from all water samples in this study, regardless of the water quality (74.3% to 99.7%). A PAC dosage of 100 mg L −1 was considered appropriate to remove metaldehyde at 5 μg L −1 after the first treatment process of pre-ozone treatment with a maximum adsorption capacity (q m ) of 0.25 μg mg −1 given by the data fitted to the Langmuir isotherm model. Removal of metaldehyde by PAC was found to be most effective when PAC was applied after the static flocculation treatment process (98.4%) with a q m of 0.29 μg mg −1 . The low adsorption capacity of PAC for low initial concentrations of metaldehyde solution was observed due to the lower driving force for mass transfer in the process of adsorption and competition with water molecules for adsorption sites on PAC.Metaldehyde is a persistent pesticide in surface water bodies which cannot be removed by traditional technologies in water treatment plants due to its physico-chemical properties. This research suggests that the application of powdered activated carbon after the 'static flocculation' treatment process in a water treatment plant can effectively remove metaldehyde.

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Section: View Article Onlinementioning

confidence: 99%

Investigation of metaldehyde removal by powdered activated carbon from different water samples

Guo

et al. 2020

Environ. Sci.: Water Res. Technol.

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“…Therefore the value of n calculated from the graph is lies on this range and Freundlich considered as satisfactory to describe adsorption. For Langmuir type adsorption process, the efficiency of the adsorption process could be predicted by the dimensionless equilibrium parameter R L , which is defined by the following equation in equation 15 (Ajenifuja et al, 2017;Li et al, 2013).…”

Section: Equilibrium Isotherm Studiesmentioning

confidence: 99%

Adsorptive removal of malachite green dye from aqueous solution onto activated carbon of Catha edulis stem as a low cost bio-adsorbent

Abate

Alene

Habte

et al. 2020

Preprint

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Background: The release of hazardous synthetic dyes into industrial effluents has emerged as an environmental problem requiring remediation. The present study focused on the preparation of a new and environmentally-friendly material (adsorbent) for the remediation of aqueous media containing dye. The low cost adsorbent was prepared from locally available khat (Catha edulis) stem which considered as waste and accumulated on waste disposal areas of woldia town, Ethiopia. Comprehensive characterization studies were carried out on the bio-adsorbent such as proximate analyses, specific surface area, and Fourier-Transform Infrared (FTIR) spectroscopy (which shows functional groups on adsorbents surface). Results: The proximate analysis shows the prepared adsorbent has very high fixed carbon content (83.65%), which refers to high quality of the adsorbent. The adsorption performance of the prepared activated carbon was optimize by varying operating parameters such as initial dye concentration (10 mg/L), pH (10), dosage (0.5 g), and contact time (60 min). The maximum removal efficiency of the prepared adsorbent at those optimum conditions was 98.8%. The experimental data was tested by most common kinetics and isotherm models. It was observed that the pseudo-second-order kinetic model fits better with good correlation coefficient and the equilibrium data fitted well with the Freundlich isotherm model. Conclusion: In summery this study demonstrated that the waste bio sorbent could be employed as an effective and eco-friendly alternative for the cleanup of dye-polluted aqueous system.

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“…To optimize the design of an adsorption system, it is important to establish the most appropriate correlation for the equilibrium curves (Ajenifuja et al, 2017). The least square fit method was used to fit the results obtained from batch adsorption experiments to Temkin, Harkins Jura, and BET adsorption isotherms.…”

Section: Adsorption Isotherm Studymentioning

confidence: 99%

Adsorption Isotherm Study for the Removal of Nickel Ions From Aqueous Solution Using Thermal Power Plant Fly Ash

Agarwal

Muthreja

Kadu³

et al. 2018

mijst

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Adsorption isotherm studies of Cu (II) and Co (II) in high concentration aqueous solutions on photocatalytically modified diatomaceous ceramic adsorbents

Cited by 58 publications

References 50 publications

Investigation of metaldehyde removal by powdered activated carbon from different water samples

Investigation of metaldehyde removal by powdered activated carbon from different water samples

Adsorptive removal of malachite green dye from aqueous solution onto activated carbon of Catha edulis stem as a low cost bio-adsorbent

Adsorption Isotherm Study for the Removal of Nickel Ions From Aqueous Solution Using Thermal Power Plant Fly Ash

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