The investigation of kinetic and isotherm of fluoride adsorption onto functionalize pumice stone

Asgari, Ghorban; Roshani, Babak; Ghanizadeh, Ghader

doi:10.1016/j.jhazmat.2012.03.003

Cited by 168 publications

(81 citation statements)

References 43 publications

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“…The closeness of the calculated qe (0.2896) to the experimental qe (0.2950) values for HDTMA-VMT0.2M further confirms that it obeys pseudo-second-order reaction based on the study by Yu et al [17] (Table 3). The same mechanism was discovered in other anionic adsorption studies such as Senturk et al [22], Kumar et al [54], Onyango et al [20], Yu et al [17], Wang et al [28], Asgari et al [26], Aroke et al [19], and Slimani et al [29], amongst others. The formation of a positively charged bilayer on the clay surface was responsible for fluoride attraction [26,55].…”

Section: Mechanism-based Modelsupporting

confidence: 67%

Fluoride Sorption Efficiency of Vermiculite Functionalised with Cationic Surfactant: Isotherm and Kinetics

2016

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Abstract:Groundwater is a major source of water, especially in rural communities. The presence of excess fluoride in groundwater has been a health concern for many decades because it causes fluorosis. The persistence of this problem led to the development of several approaches for reducing fluoride in groundwater to ≤1.5 mg/L, which is the World Health Organization's (WHO) permissible limit. Despite recorded success in fluoride reduction, drawbacks such as cost and efficiency have remained apparent, thus necessitating further research on defluoridation. This paper aims at assessing the defluoridation capacity of a clay mineral, vermiculite, when modified with the cationic surfactant hexadecyltrimethylammonium bromide. The effects of experimental parameters such as pH, agitation time, mass of adsorbent, and temperature were examined to determine the most favourable adsorption conditions. Using batch technique, the results showed a fluoride sorption of 51% from an 8 mg/L fluoride solution. The adsorption conformed more to Freundlich than Langmuir isotherm with an adsorption capacity of 2.36 mg/g, while the kinetics conformed to a pseudo-second-order reaction. pH emerged as the most influential factor in optimisation. The findings of this study indicated that modified vermiculite could be efficient in reducing fluoride in groundwater to more tolerable limits, but requires adequate pH control.

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Section: Mechanism-based Modelsupporting

confidence: 67%

Fluoride Sorption Efficiency of Vermiculite Functionalised with Cationic Surfactant: Isotherm and Kinetics

2016

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“…The isotherms of MB on MPS were found to be linear for the entire concentration range studies and the correlation coefficients were extremely high (R 2 > 0.99) as shown in Table 3. As Table 3 shows, the maximum adsorption capacity of the MPS in the Langmuir model was obtained as 15.87 mg/g which is considered as a favorable rate compared to other similar studies (Table 4) (29)(30)(31)(32). The Freundlich isotherm (33) is derived by assuming a heterogeneous surface with a non-uniform distribution of sorption heat over the surface.…”

Section: Dubinin-radushkevichmentioning

confidence: 71%

Adsorption of Methylene Blue Dye from Aqueous Solutions by Modified Pumice Stone: Kinetics and Equilibrium Studies

et al. 2013

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Background: Dyes are one of the most important industrial pollutants, especially in textile industries. Many methods have been proposed in order to remove color from wastewater among which, adsorption is more acceptable due to the ability for its use in the large scale. Objectives: The objective of this study was to investigate pumice as an inexpensive adsorbent for removal of Methylene Blue from aqueous solutions. Materials and Methods:In this work the Modified Pumice Stone has been applied for removal of the Methylene Blue dye from aqueous environments. The effect of pH, contact time, initial concentration and amount of adsorbent were considered. In order to investigate the mechanism of the adsorption process, several kinetic models including pseudo-first order, pseudo-second order and intra-particle diffusion were used. In addition, equilibrium data was fitted on to Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models. Results: Results showed that the adsorption of the Methylene Blue was enhanced with increasing initial dye concentration, pH and contact time. The optimum pH was 10. The q max for adsorption of methylene blue dye from the Langmuir model was 15.87 mg/g. Considering the values of R 2 (0.999) and χ 2 , Freundlich isotherm model and pseudo-second order kinetic model had the best fitness. Conclusions:This study has demonstrated that the modified Pumice stone with HCl can be employed as effective and inexpensive adsorbent for the removal of Methylene Blue from aqueous environments.

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“…Note that the carbon content is due to the fiber composition (cotton) and to the indigo-derivative dyes loaded onto these fibers. Additionally, the high content of Si (*28 %), Al (7.26 %) and K (3.06 %) found in the denim fiber scraps is caused by the stone washing process because the pumice stone is composed of SiO 2 (65.21 %), Al 2 O 3 (15.50 %), CaO (2.51 %), MgO (0.86 %), Na 2 O (1.81 %), K 2 O (2.68 %) and Fe 2 O 3 (2.61 %) (Asgari et al 2012). In this context, the FT-IR spectra of raw denim fibers confirmed this finding (Fig.…”

Section: Characterization Of Denim Fiber Scrapsmentioning

confidence: 99%

Removal of heavy metals and arsenic from aqueous solution using textile wastes from denim industry

Mendoza-Castillo

Rojas-Mayorga

García-Martínez

et al. 2014

Int. J. Environ. Sci. Technol.

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In this study, the denim fiber scraps were reused as an alternative low-cost sorbent for the removal of heavy metals Pb 2? , Cd 2? , Zn 2? and arsenic from aqueous solutions. Results showed that this textile waste was an effective sorbent for the removal of these heavy metal ions and offered a better removal performance than those reported for other synthetic and natural sorbents such as activated carbons and zeolites. On the other hand, raw and metal-loaded denim wastes were also useful for the removal of arsenic (V) from aqueous solutions and their sorption capacities were higher than 1.5 mg/g. In particular, the presence of Pb 2? ions on the surface of denim wastes improved significantly its arsenic (V) sorption performance. In summary, the reuse of denim textile wastes in wastewater treatment can be considered as an eco-friendly application that could be useful for waste management and also for reducing the production costs in this important industrial sector.

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The investigation of kinetic and isotherm of fluoride adsorption onto functionalize pumice stone

Cited by 168 publications

References 43 publications

Fluoride Sorption Efficiency of Vermiculite Functionalised with Cationic Surfactant: Isotherm and Kinetics

Fluoride Sorption Efficiency of Vermiculite Functionalised with Cationic Surfactant: Isotherm and Kinetics

Adsorption of Methylene Blue Dye from Aqueous Solutions by Modified Pumice Stone: Kinetics and Equilibrium Studies

Removal of heavy metals and arsenic from aqueous solution using textile wastes from denim industry

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