A novel bentonite-based adsorbent for anionic pollutant removal from water

Ma, Jianfeng; Qi, Jianwei; Yao, Chao; Cui, Bingying; Zhang, Tianli; Li, Dinglong

doi:10.1016/j.cej.2012.06.014

Cited by 94 publications

(41 citation statements)

References 39 publications

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“…The positive value for ∆H 0 (38.24 kJ/mol) gives an idea that adsorption occurs by the endothermic process, and also the positive value for ∆S 0 (133.52 J/mol/K) indicates that there is an increase in randomness and also the affinity of phosphate ions towards the adsorbent surface. A similar observation was obtained for modified bentonite for the removal of the anionic pollutant from the aqueous phase [51,52].…”

Section: Adsorption Kinetics Isotherm and Thermodynamic Studiessupporting

confidence: 81%

Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

et al. 2020

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In this work, the water quality status of the surface water that lies around the Karamana River basin, Trivandrum urban area, was studied on the basis of the water quality index (WQI) method. The eutrophic condition of the basin is revealed, and proper mitigation strategy was adopted for the removal of phosphate species using pillared clay materials. Proper sampling was carried out in the urban rivers, and various physico-chemical parameters for evaluating the quality of water were analysed. WQI values obtained for these riverine systems are in the range 317.7-3005.1, indicating that the water is not suitable without treatment for any domestic activities. Also, phosphate ions in the range 1.98-20.52 mg/L reflect the dominance of phosphate species in surface water. A proper mitigation strategy was adopted for the selective removal of phosphate ions using adsorption technique by using zirconium-pillared bentonite clay (ZPBC) prepared by the stirring-ageing technique. The batch adsorption experiment performed on simulated phosphate solution shows that for 2.0 g/L of ZPBC a maximum phosphate adsorption capacity of 35.71 mg/g was achieved in 30 min at pH 3.0. The data obtained were used to study models in kinetics and isotherm. The reusability of spent ZPBC for five continuous cycles without major loss in adsorption capacity using 0.025 M Na 2 CO 3 extractant was proved from the desorption study. A single-stage reactor was also designed from the isotherm data and proved to be effective. The applicability of the adsorbent towards phosphate anions was successfully checked in the laboratory using surface water collected and found that the complete removal of phosphate was achieved using 6.0, 8.0 and 10.0 g/L of ZPBC.Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s4245 2-020-2571-0) contains supplementary material, which is available to authorized users.

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Section: Adsorption Kinetics Isotherm and Thermodynamic Studiessupporting

confidence: 81%

Assessment of urban river water quality and developing strategies for phosphate removal from water and wastewaters: Integrated monitoring and mitigation studies

et al. 2020

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“…When the activated samples were compared, it was found that the maximum amount of adsorption (42.88 mg/g) was observed for BA 1N for 24h. Similar results were reported by Ma et al [45] for the removal of anionic pollutants by activated bentonite. For the next experiments, we use only the BA 1N samples as adsorbents for 24h.…”

Section: Adsorption Isothermssupporting

confidence: 81%

Removal of Chlorothalonil from water by a bentonite treated chemically

Boudouara¹,

Marouf²,

Ouadjenia³

et al. 2017

JMES

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The adsorption of Chlorothalonil fungicide from aqueous solution onto raw and activated bentonite samples was investigated as a function of parameters such as pH, contact time, and temperature. The acid activation of natural bentonite was performed by treatment with hydrochloric solution of different concentrations. The high adsorption capacity of chlorothalonil was obtained by activated bentonite at 323 K in the range of pH 3-4 for 60 min of contact time. It was be 32.01 and 42.88 mg/g for raw and bentonite activated by 1N hydrochloric acid, respectively. The Langmuir and Freundlich adsorption models were applied to describe the related isotherms. Freundlich equation has shown the best fitting with the experimental data. The pseudo-first order and pseudo-second order kinetic models were used to describe the kinetic data. The changes of enthalpy, entropy and Gibbs free energy of adsorption process were determined. The results indicated that the adsorption of chlorothalonil occurs spontaneously as an endothermic process.

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“…This shortcoming can be rectified by modification of the structure by organic and/ or inorganic cation intercalation (Atia, 2008), thus allowing a broad range of adsorption capacity. More recently and specifically, adsorption properties of bentonite have been enhanced by replacing quaternary ammonium cations with interlayer cations, which have been effectively used in environmental remediation studies for the removal of organic and anionic pollutants (Bors et al, 1999, Lee and Kim, 2002, Majdan et al, 2005, Gammoudi et al, 2012, Ma et al, 2012, Sarkar et al, 2012, Chen et al, 2014. Such organo-bentonites (OBent) have also been widely used in the making of clay-polymer nanocomposites (Carrado and Komadel, 2009, Eisenhour and Brown, 2009, Carrosco et al, 2011.…”

Section: Introductionmentioning

confidence: 99%