Removal of fluoride from groundwater using natural clay (kaolinite): Optimization of adsorption conditions

Nabbou, Nouria; Belhachemi, Meriem; Boumelik, Mustapha; Merzougui, Touhami; Lahcene, Driss; Harek, Yahia; Zorpas, Antonis A.; Jeguirim, Mejdi

doi:10.1016/j.crci.2018.09.010

Cited by 119 publications

(28 citation statements)

References 33 publications

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“…e electrostatic interaction between the positively charged MB and H + weakens the adsorption process. Conversely, occurrence of deprotonation of the tea stem powder increases the number of active adsorption sites and reduces electrostatic force [29,50,51]. erefore, the effect of pH on the adsorption of MB in this study reveals that the removal efficiency maintains constantly at the pH range of 5.0-11.0, which agrees with the pH zpc of tea stem powder.…”

Section: Effect Of Phsupporting

confidence: 77%

Tea Stem as a Sorbent for Removal of Methylene Blue from Aqueous Phase

Lee

Wang

Huang

et al. 2019

Advances in Materials Science and Engineering

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The potentiality of tea stem for the adsorption of methylene blue (MB) from aqueous phase was investigated. A series of operating factors, including the initial MB concentration, contact time, pH of solution, dose of tea stem, and ionic strength of solution, were conducted to understand the effect of adsorption of MB onto tea stem. Adsorption isotherm, kinetic models, thermodynamic investigation, and regenerability of tea stem were systematically investigated in this study. The experiment results revealed that the removal efficiency decreased with MB concentration and the equilibrium time of adsorption at different initial MB concentrations was approximately at 60 min. The appropriate dose of tea stem powder was found to be 4 g/L. The pHzpc of tea stem was evaluated and was observed to be 6.0 ± 0.2. The removal efficiency increased with pH ranging from 3.0 to 5.0 and remained constantly at the pH range of 5.0–11.0. The pH affected the adsorption because of the repellent power between H+ and dye cation. The ionic strength was found to have a negligible effect on the adsorption. The Langmuir and Temkin isotherm models were found to be the best isotherm models to elucidate the adsorption mechanism between MB and tea stem powder. The maximum adsorption capacity of 103.09 mg/g derived from the Langmuir model was much close to the experimental result. From the kinetic analysis, the pseudo-second-order model was found to be the suitable model to describe the adsorption behavior. The calculated adsorption capacities at different temperatures derived from the pseudo-second-order model ranging from 68.91 to 69.8 mg/g were well close to the experimental data. The intraparticle diffusion of MB molecules into pore structures of tea stem powder is the rate-limiting step for the adsorption process in this study. Evaluation of thermodynamic parameters including changes in enthalpy, entropy, and Gibb’s free energy indicated the adsorption mechanism between MB and tea stem powder was a spontaneous and exothermic process. The regeneration/adsorption experiments indicated that the tea stem powder efficiently remained more than 97% after five cycles using NaOH as a desorbing agent and thus be used for many times. On the basis of experimental results obtained, it is concluded that the tea stem has a considerable potential as a low-cost sorbent for removing MB from the aqueous phase.

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Section: Effect Of Phsupporting

confidence: 77%

Tea Stem as a Sorbent for Removal of Methylene Blue from Aqueous Phase

Lee

Wang

Huang

et al. 2019

Advances in Materials Science and Engineering

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“…A comparison with other adsorbents indicated a high metal ion adsorption capacity of nano platelets kaolinite. Present study results are in line with previous studies (Abukhadra et al, 2019;Amer and Awwad, 2018;Chen et al, 2019;Fatimah, 2018;He et al, 2019;Kuang et al, 2019;Ma et al, 2019;Nabbou et al, 2019;Ruyter-Hooley et al, 2017;Zhu et al, 2018) that kaolinite could be a potential adsorbent for the pollutants of environmental concern.…”

Section: Comparison Of Platelets Nano Kaolinite With Other Kaolin Adssupporting

confidence: 93%

Nano platelets kaolinite for the adsorption of toxic metal ions in the environment

Int¹

2019

Preprint

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Contamination of water reservoirs with different toxic metal ions from industrial activities has emerged as one of major issues in recent years. The adsorption of Pb(II) ions from aqueous solution onto Nano platelets kaolinite has been investigated. The adsorption studies were determined as a function of pH, contact time, initial metal ion concentration, adsorbent dosage and temperature. Nano platelets kaolinite prepared from raw Jordanian kaolin clay showed size in the range of 12-80 nm. Maximum adsorption capacity as determined by Langmuir isotherm model is 175.44 mg/g for Pb(II). Thermodynamic parameters, ΔGo, ΔHo and ΔSo were revealed that the adsorption process is spontaneous and endothermic process. The results showed that Nano platelets kaolinite can be efficiently used as a low-cost alternative and eco-friendly adsorbent for the removal of toxic heavy metals from wastewater.

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“…Adsorption experiments show effective fluoride ion removal when the pH ranges between 4.5 and 6. The adsorption capacities under these conditions were 0.442 and 0.448 mg/g, respectively (Nabbou et al, 2019). The authors suggested that natural clay comprised of SiO 2 (53.83%) and Al 2 O 3 (39.81%) could be an excellent adsorbent for removal of fluoride from groundwater in Tindouf (Algeria), where fluoride concentrations often exceed recommended drinking water standards.…”

Section: Fluoride In Groundwatermentioning

confidence: 99%

Groundwater pollution: Occurrence, detection, and remediation of organic and inorganic pollutants

Kurwadkar

Kanel

Nakarmi

2020

Water Environment Research

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Groundwater pollution is a result of natural and anthropogenic activities. While the elevated levels of various inorganic constituents could be attributed to natural processes, such as geological weathering and aquifer characteristics, many times, anthropogenic activities also substantially pollute the groundwater. On the contrary, the occurrence of organic pollutants is primarily due to various anthropogenic activities. Extensive groundwater mining, the hydraulic connection between groundwater and other surface water bodies, and leaking underground buried infrastructure also contribute to groundwater pollution. Water resources are scarce commodities, and preserving groundwater quality is of critical concern. This paper documents instances of groundwater quality impact during the year 2019 due to both natural and anthropogenic activities throughout the world.

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Removal of fluoride from groundwater using natural clay (kaolinite): Optimization of adsorption conditions

Cited by 119 publications

References 33 publications

Tea Stem as a Sorbent for Removal of Methylene Blue from Aqueous Phase

Tea Stem as a Sorbent for Removal of Methylene Blue from Aqueous Phase

Nano platelets kaolinite for the adsorption of toxic metal ions in the environment

Groundwater pollution: Occurrence, detection, and remediation of organic and inorganic pollutants

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