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Subject: search.filters.subject.Adsorption kinetics

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    Rubber Wood Sawdust Waste Converted to Activated Carbon for Heavy Metal Removal from Wastewater
    (2023-01-01)
    Kengchuwong, Metta
    ;
    Ketwong, Chatyapha
    ;
    Nuasri, Chompoo
    ;
    Wanich, Suchana
    ;
    Trisupakitti, Somsuk
    In this study, we characterized activated carbon prepared from rubber wood sawdust waste and determined optimum conditions for removing copper ions from synthetic wastewater. Rubber wood sawdust was calcined at 600°C for 30 min and then activated with commercial vinegar (5%v/v acetic acid) or 5% lime juice for 24 hr. Three characteristics of the activated carbon were evaluated: (i) to study the ability to remove copper ions versus exposure time, pH and the amount of adsorbent, (ii) adsorption isotherms and (iii) adsorption kinetics. A Langmuir isotherm indicated that the activated carbon adsorbed a monolayer of Cu(II) ions, K<inf>L</inf> = 7.91 mg/L with a capacity to adsorb 0.37 mg Cu(II)/g. The optimum conditions for usage was found at 20 g/L activated carbon in wastewater, pH 5 and 60 min adsorption time. Adsorption kinetics were consistent with a pseudo-second order reaction. The results of the study suggest that converting rubber wood sawdust waste to activated carbon allows it to become useful to remove heavy metal pollutants from wastewater.
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    Adsorption of silver, thorium and nickel ions from aqueous solution onto rice husk
    (2021-10-01)
    Zafar, Shagufta
    ;
    Khan, Muhammad Imran
    ;
    Shanableh, Abdallah
    ;
    Ahmad, Saleem
    ;
    Manzoor, Suryyia
    In this article, adsorption of metal ions such as silver (Ag(I)), thorium (Th(IV)) and nickel (Ni(II)) from aqueous solution onto rice husk (RH) was performed at room temperature. Adsorption of these metal ions (silver, thorium, and nickel) onto RH was demonstrated by using Fourier trans-form infrared spectroscopy and energy-dispersive X-ray. Morphology of RH was investigated before and after adsorption of these metal ions onto it by using scanning electron microscopy. The effect of different operational parameters (contact time, initial concentration of metal ion solution, weight of RH, pH, and temperature) on the percentage removal of these metal ions was explored in detail and compared. Experimental data for adsorption of these metal ions onto RH was sub-jected to Langmuir and Freundlich isotherm models. Results showed that adsorption of silver and thorium fitted well to Langmuir isotherm model (R<sup>2</sup> > 0.99) whereas adsorption of Ni(II) fitted well to Freundlich isotherm model (R<sup>2</sup> > 0.99). Adsorption kinetics study demonstrated that adsorp-tion of these metal ions onto RH from aqueous solution fitted well to pseudo-second-order model. Adsorption thermodynamics investigation represented that adsorption of these metal ions onto RH was endothermic process. The values of Gibb’s free energy were –6.53 to –9.17 kJ/mol for Ag(I), –1.11 to –3.57 kJ/mol for Th(IV) and –0.89 to –1.40 kJ/mol for Ni(II). The negative values of Gibb’s free energy for these metal ions suggested that the adsorption process was spontaneous in nature. The regeneration of RH and recovery of these metal ions were also studied.
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    Arsenic adsorption using the adsorbent synthesised from oyster shell
    (2017-01-01)
    Khownpurk, Pichnipa
    ;
    Wongpromrat, Wichitra
    ;
    Chandra-Ambhorn, Walairat
    Ground oyster shells were calcined and used as an adsorbent to remove As (III) from contaminated water. Adsorption experiment was performed by batch tests. The effect of pH on the adsorption performance was investigated. The result showed that at the initial concentration of 100 mg/L, over the pH range of 5-11, the highest efficiency was obtained at pH 11. The experimental data better correlated with pseudo-second order model. The maximum adsorption capacity (q<inf>m</inf>) of approximately 195.5 mg/g was obtained at pH 11.