Optimization of fluoride adsorption onto natural and modified pumice using response surface methodology: Isotherm, kinetic and thermodynamic studies

Dehghani, Mohammad Hadi; Faraji, Maryam; Mohammadi, Amir; Kamani, Hossein

doi:10.1007/s11814-016-0274-4

Cited by 69 publications

(32 citation statements)

References 31 publications

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“…DOE reduces the number of experimental runs, so, it can save energy, time, and usage of materials . Response surface methodology (RSM) is a collection of mathematical and statistical techniques, which introduced as a DOE method and useful for developing, improving, and optimizing processes . This method is a multivariate statistic technique, which used to determine the effect of two or more factors .…”

Section: Introductionmentioning

confidence: 99%

Optimization Removal of the Ceftriaxone Drug from Aqueous Media with Novel Zero‐Valent Iron Supported on Doped Strontium Hexaferrite Nanoparticles by Response Surface Methodology

2020

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The present study, a novel and efficient adsorbent nano zerovalent iron stabilized on strontium hexaferrite (nZVI/SrFe 12 O 19 ) was synthesized for removal of ceftriaxone antibiotic from aqueous solution. Its characteristics were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy-dispersive Xray spectroscopy (EDX). Response Surface Methodology (RSM) based on Box-Behnken Design (BBD) were used to achieve the optimal experimental conditions. The effects of parameters such as pH (5-9), initial concentration of ceftriaxone (5-15 mg L À 1 ), and adsorbent dosage (0.05-0.15 g L À 1 ) on removal efficiency were investigated. A mathematical model was studied to predict the removal performance. The significance and adequacy of the model were surveyed using analysis of variance (ANOVA). The results showed that second-order polynomial model is suitable for the prediction removal of ceftriaxone. The highest removal value of mentioned drug were obtained 98 % at adsorbent dosage of 0.15 g L À 1 , pH = 5, and the pollutant concentration of 10 mg L À 1 . Finally, the isotherms and kinetic studies were evaluated. The Langmuir with R 2 = 0.9981 and pseudo-second-order with R 2 = 0.9996 were the best isotherm and kinetic, respectively. The thermodynamic parameters such as ΔH 0 , ΔS 0 , and ΔG 0 were calculated and it was indicated that adsorption process was exothermic and spontaneous.[a] Dr.

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Section: Introductionmentioning

confidence: 99%

Optimization Removal of the Ceftriaxone Drug from Aqueous Media with Novel Zero‐Valent Iron Supported on Doped Strontium Hexaferrite Nanoparticles by Response Surface Methodology

2020

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“…In statistics, response surface methodology explores the relationships between several explanatory variables and one or more response variables. The main idea of RSM is the use of a sequence of designed experiments to obtain an optimal response [39][40][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

Removal of cephalexin from artificial wastewater by mesoporous silica materials using Box-Behnken response surface methodology

Panahi¹,

Ashrafi²,

Kamani³

et al. 2019

Desalination and Water Treatment

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a b s t r a c tMesoporous silica such as MCM-41 was used as an adsorbent for the removal of cephalexin antibiotic from synthetic wastewater. In this study, MCM-41 adsorbent was synthesised and was characterised by FE-SEM, XRD, FTIR and isotherms of adsorption/desorption of N 2 . The effects of initial pH, adsorbent dose, initial adsorbate concentration, contact time and temperature on process efficiency were evaluated using Box-Behnken statistical experiment design (RSM). FTIR analysis revealed the Si-OH, H-O-H and Si-O-Si bonds are formed. According to BET surface area, MCM-41 had pores with a diameter of more than 2.0 nm and surface area of 1,097 m 2 g -1 and also XRD spectra showed the mean crystallite size of MCM-41 was 75 nm. The statistical results show that pH, adsorbent dose, initial antibiotic concentration, temperature and quadratic pH were significant and presented with probability <0.05. The optimum removal condition based on analysis of variance and the quadratic model was the initial pH of adsorbate solution fixed at 3.00, adsorbent dose 800 mg L -1 , the initial concentration of antibiotic at 50.0 mg L -1 , a temperature of 40.0°C, and at the adsorption time of 30.0 min. Under these conditions, the percentage removal of cephalexin antibiotic was 90.3%. Therefore, according to the obtained results, the mesoporous silica can be used to adsorb cephalexin antibiotic in optimal conditions designed by response surface methodology.

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“…Therefore, it is very essential to treat Cr(VI) containing effluents before their discharge into the environment in order to prevent the deleterious impact of Cr(VI) on the environment and human health. Many techniques have been developed over the years for the removal of toxic metals from water and wastewater including chemical precipitation, bioadsorption, ion-exchange, evaporation, advanced oxidation processes, complexation, membrane separation, electrolysis, reverse osmosis, biological treatment and nanoparticles [9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Recently, bioadsorption techniques using natural biopolymers including chitin and chitosan composites have been developed due to their biocompatibility, biodegradability, non-toxicity, abundance in nature, chelating ability with heavy metals and cost-effectiveness to adsorb heavy metals as an alternative to conventional wastewater treatment processes, even at low concentrations [23].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(VI) ions from aqueous systems using thermally sodium organo-bentonite biopolymer composite (TSOBC): response surface methodology, isotherm, kinetic and thermodynamic studies

Dehghani¹,

Zarei²,

Mesdaghinia³

et al. 2017

Desalination and Water Treatment

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a b s t r a c tChromium, as a serious environmental contaminant, is frequently encountered in different industrial effluents. In the present study, we focused on the combined application of a surfactant-modified bentonite and chitosan for the removal of Cr(VI). In addition, the effects of several important parameters such as pH (2-8), adsorbent dosage (0.1-1.5 g/L), Cr(VI) concentration (20-200 mg/L) and contact time (60-240 min) were also investigated and the process was optimized by means of response surface methodology. The analysis of variance of the quadratic model demonstrates that the model was highly significant. Optimized values of pH, adsorbent dosage, initial Cr(VI) concentration and contact time were found to be 3.7, 1.40 g/L, 77 mg/L and 180 min, respectively. The results revealed that the prepared adsorbent had significant adsorption capacity (124.1 mg/g) for Cr(VI). All results showed that thermally sodium organo-bentonite biopolymer composite (TSOBC) had a good affinity toward Cr(VI). Among the isotherm models tested, Langmuir isotherm model was found to be the best fit for the obtained data. The adsorption kinetics indicated that Cr(VI) adsorption on TSOBC followed pseudo-second-order better than pseudo-first-order model. Moreover, thermodynamic studies showed that adsorption of Cr(VI) on TSOBC was spontaneous and endothermic in nature. The applied adsorbent was characterized by scanning electron microscopy, X-ray diffraction, energy dispersive X-ray and Fourier-transform infrared spectroscopic techniques.

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Optimization of fluoride adsorption onto natural and modified pumice using response surface methodology: Isotherm, kinetic and thermodynamic studies

Cited by 69 publications

References 31 publications

Optimization Removal of the Ceftriaxone Drug from Aqueous Media with Novel Zero‐Valent Iron Supported on Doped Strontium Hexaferrite Nanoparticles by Response Surface Methodology

Optimization Removal of the Ceftriaxone Drug from Aqueous Media with Novel Zero‐Valent Iron Supported on Doped Strontium Hexaferrite Nanoparticles by Response Surface Methodology

Removal of cephalexin from artificial wastewater by mesoporous silica materials using Box-Behnken response surface methodology

Adsorption of Cr(VI) ions from aqueous systems using thermally sodium organo-bentonite biopolymer composite (TSOBC): response surface methodology, isotherm, kinetic and thermodynamic studies

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