Adsorption of humic acid on bentonite

Salman, Mahmoud; El‐Eswed, Bassam; Khalili, Fawwaz I.

doi:10.1016/j.clay.2007.02.011

Cited by 81 publications

(45 citation statements)

References 9 publications

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“…5). Based on previous studies, the best pH for HA removal is 3 (Salman et al, 2007;Terdkiatburana et al, 2008;Wang et al, 2008;Doulia et al, 2009). At pH values below 3.0 the concentration of hydroxonium ions in the solution would be high and prevents any adsorption by the active sites on the substrate surface.…”

Section: Effect Of Experimental Parameters On CD and Ha Adsorption Efmentioning

confidence: 99%

Removal of cadmium and humic acid from aqueous solutions using surface modified nanozeolite A

Tashauoei

Attar

Amin

et al. 2010

Int. J. Environ. Sci. Technol.

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ABSTRACT:The sorption of cadmium and humic acids from aqueous solutions using surface-modified nanozeolite A has been investigated under various examination conditions. The morphology of untreated and treated nanozeolite was studied under scanning electron microscope and transmission electron microscope. Isotherms of cadmium adsorption onto surfacemodified nanozeolite A were studied at different pH, solid to liquid ratio, adsorbate concentration and interaction time. Kinetic and equilibrium studies were conducted and the equilibrium data have been analyzed using Langmuir and Freundlich isotherm models. The study revealed that experimental results were in agreement with the Freundlich model. The Langmuir monolayer adsorption capacity was found to be 1666.67 g cadmium and 6.75 g humic acid per gram of modified nanozeolite A, which is higher than that of reported value for other zeolites. The sorption ability was enhanced by surface modification and reduction in size and enabled the zeolite to adsorb cadmium. The adsorption of cadmium and humic acid on nanozeolite was found to be the highest at pH 6 and 3, respectively. Results showed that solid to liquid ratio and pH are the most important factors for cadmium and humic acid removal, respectively. Effect of competitive ions was studied and results showed that there is no competition between cadmium and humic acid sorption and presence of these ions.

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Section: Effect Of Experimental Parameters On CD and Ha Adsorption Efmentioning

confidence: 99%

Removal of cadmium and humic acid from aqueous solutions using surface modified nanozeolite A

Tashauoei

Attar

Amin

et al. 2010

Int. J. Environ. Sci. Technol.

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show abstract

“…is process was done using the following steps: �rstly, the bentonite samples of particle size less than 250 m were mixed with distilled water and then the suspension was centrifuged at 750 rpm to obtain particles less than 2 m. ese particles were carefully separated in large bottles. e centrifugation was repeated for further �ve times [14]. e centrifuged (pure) bentonite samples were dried in an oven at 105 ∘ C for 4 hours and stored in polyethylene bottles.…”

Section: Puri�cation Of Al-azra�mentioning

confidence: 99%

Sorption of Uranium(VI) and Thorium(IV) by Jordanian Bentonite

Khalili

Salameh

Shaybe

2012

Journal of Chemistry

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Puri�cation of raw bentonite was done to remove quartz. is includes mixing the raw bentonite with water and then centrifuge it at �50 rpm; this process is repeated until white puri�ed bentonite is obtained. �RD, �RF, FTIR, and SEM techniques will be used for the characterization of puri�ed bentonite. e sorption behavior of puri�ed Jordanian bentonite towards UO 2 2+and  4+ metal ions in aqueous solutions was studied by batch experiment as a function of pH, contact time, temperature, and column techniques at 25.0 ∘ C and pH = 3. e highest rate of metal ions uptake was observed aer 18 h of shaking, and the uptake has increased with increasing pH and reached a maximum at pH = 3. Bentonite has shown high metal ion uptake capacity toward uranium(VI) than thorium(IV). Sorption data were evaluated according to the pseudo-second-order reaction kinetic. Sorption isotherms were studied at temperatures 25.0 ∘ C, 35.0 ∘ C, and 45.0 ∘ C. e Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) sorption models equations were applied and the proper constants were derived. It was found that the sorption process is enthalpy driven for uranium(VI) and thorium(IV). Recovery of uranium(VI) and thorium(IV) ions aer sorption was carried out by treatment of the loaded bentonite with different concentrations of HNO 3 1.0 M, 0.5 M, 0.1 M, and 0.01 M. e best percent recovery for uranium(VI) and thorium(IV) was obtained when 1.0 M HNO 3 was used.

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“…These particles were carefully separated into large bottles. This process was repeated four times for each sample, to guarantee obtaining samples in a pure form [32]. The suspension was collected, following evaporation of the water at 35°C on a hot plate.…”

Section: Methodsmentioning

confidence: 99%

Olive Mill Wastewater Treatment Using Simple Raw and Purified Jordanian Bentonite Based Low-Cost Method

Al-Essa¹

2018

Asian J. Chem.

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Adsorption of humic acid on bentonite

Cited by 81 publications

References 9 publications

Removal of cadmium and humic acid from aqueous solutions using surface modified nanozeolite A

Removal of cadmium and humic acid from aqueous solutions using surface modified nanozeolite A

Sorption of Uranium(VI) and Thorium(IV) by Jordanian Bentonite

Olive Mill Wastewater Treatment Using Simple Raw and Purified Jordanian Bentonite Based Low-Cost Method

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