Kinetic and isotherm study of Bromothymol Blue and Methylene blue removal using Au-NP loaded on activated carbon

Ghaedi, Mehrorang; Nazari, E.; Sahraie, R.; Purkait, Mihir Kumar

doi:10.1080/19443994.2013.822156

Cited by 26 publications

(12 citation statements)

References 43 publications

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“…Parameter k 1 as rate constant (g min −1 ) was calculated from the slope of a plot of log( q e − q t ) versus t and q e was estimated from its intercept . In the pseudo‐second‐order model, k 2 (rate constant) was obtained from the slope of the line obtained from plotting t / q t versus t and q e can be determined from its intercept . In the intraparticle diffusion model, C is the thickness of the boundary layer and K diff is the intraparticle diffusion rate constant (mg g −1 min −1/2 ) which are calculated from the intercept and slope of a plot of q t versus t 1/2 , respectively .…”

Section: Resultsmentioning

confidence: 99%

Comparative study of acid yellow 119 adsorption onto activated carbon prepared from lemon wood and ZnO nanoparticles loaded on activated carbon

Jamshidi

Ghaedi

Sabzehmeidani

et al. 2017

Applied Organom Chemis

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Activated carbon from lemon wood (AC) and ZnO nanoparticles loaded on activated carbon (ZnO‐NP‐AC) were prepared and their efficiency for effective acid yellow 199 (AY 199) removal under various operational conditions was investigated. The dependence of removal efficiency on variables such as AY 199 concentration, amount of adsorbent and contact time was optimized using response surface methodology and Design‐Expert. ZnO nanoparticles and ZnO‐NP‐AC were studied using various techniques such as scanning electron microscopy, X‐ray diffraction and energy‐dispersive X‐ray analysis. The optimum pH was studied using one‐at‐a‐time method to achieve maximum dye removal percentage. Small amounts of the proposed adsorbents (0.025 and 0.025 g) were sufficient for successful removal of AY 199 in short times (4.0 and 4.0 min) with high adsorption capacity (85.51 and 116.29 mg g−1 for AC and ZnO‐NPs‐AC, respectively). Fitting the empirical equilibrium data to several conventional isotherm models at optimum conditions indicated the appropriateness of the Langmuir model with high correlation coefficient (0.999 and 0.978 for AC and ZnO‐NPs‐AC, respectively) for representation and explanation of experimental data. Kinetics evaluation of experiments at various time intervals revealed that adsorption processes can be well predicted and fitted by pseudo‐second‐order and Elovich models. This study revealed that the combination of ZnO nanoparticles and AC following simple loading led to significant improvement in the removal process in short adsorption time which was enhanced by mixing the media via sonication.

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Section: Resultsmentioning

confidence: 99%

Comparative study of acid yellow 119 adsorption onto activated carbon prepared from lemon wood and ZnO nanoparticles loaded on activated carbon

Jamshidi

Ghaedi

Sabzehmeidani

et al. 2017

Applied Organom Chemis

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“…where B 1 = RT/b, T is the absolute temperature in Kelvin, R is the universal gas constant (8.314 J K −1 mol −1 ). The values of B 1 and K T are calculated from the plot of q e versus ln C e [45,46].…”

Section: Adsorption Equilibrium Studymentioning

confidence: 99%

Sonochemical assisted hydrothermal synthesis of ZnO: Cr nanoparticles loaded activated carbon for simultaneous ultrasound-assisted adsorption of ternary toxic organic dye: Derivative spectrophotometric, optimization, kinetic and isotherm study

Jamshidi

Ghaedi

Dashtian

et al. 2016

Ultrasonics Sonochemistry

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120

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Chromium doped zinc oxide nanoparticles (ZnO: Cr-NPs) was synthesized by ultrasonically assisted hydrothermal method and characterized by FE-SEM, XRD and TEM analysis. Subsequently, this composite ultrasonically assisted was deposited on activated carbon (ZnO: Cr-NPs-AC) and used for simultaneous ultrasound-assisted removal of three toxic organic dye namely of malachite green (MG), eosin yellow (EY) and Auramine O (AO). Dyes spectra overlap in mixture (major problem for simultaneous investigation) of this systems was extensively resolved by derivative spectrophotometric method. The magnitude of variables like initial dyes concentration, adsorbent mass and sonication time influence on dyes removal was optimized using small central composite design (CCD) combined with desirability function (DF) approach, while pH was studied by one-a-time approach. The maximized removal percentages at desirability of 0.9740 was set as follow: pH 6.0, 0.019g ZnO: Cr-NPs-AC, 3.9min sonication at 4.5, 4.8 and 4.7mgL(-1) of MG, EY and AO, respectively. Above optimized points lead to achievement of removal percentage of 98.36%, 97.24%, and 99.26% correspond to MG, EY and AO, respectively. ANOVA for each dyes based p-value less than (<0.0001) suggest highly efficiency of CCD model for prediction of data concern to simultaneous removal of these dyes within 95% confidence interval, while their F-value for MG, EY and AO is 935, 800.2, and 551.3, respectively, that confirm low participation of this them in signal. The value of multiple correlation coefficient R(2), adjusted and predicted R(2) for simultaneous removal of MG is 0.9982, 0.9972 and 0.9940, EY is 0.9979, 0.9967 and 0.9930 and for AO is 0.9970, 0.9952 and 0.9939. The adsorption rate well fitted by pseudo second-order and Langmuir model via high, economic and profitable adsorption capacity of 214.0, 189.7 and 211.6mgg(-1) for MG, EY and AO, respectively.

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“…The adsorption efficiency of agricultural residues is considerably enhanced by chemical modifications [15,16]. Recently, oxidized multiwalled carbon nanotubes (MWCNTs-COOH) and gold nanoparticle loaded on activated carbon (Au-Np-AC) have been reported for adsorptive removal of BTB from aqueous solution with the saturation capacity of 55.52 and 95.24 mg/g, respectively [26,27]. Chitosan is an effective adsorbent for color removal [18][19][20], but, it has limited applicability because (a) it dissolves below pH 5.5 which makes it ineffective for acid dyes removal [19], and (b) its difficulty in separation and recovery [21].…”

Section: Introductionmentioning

confidence: 99%

“…Chitosan composite with cotton fibers has recently been reported for the adsorption of Indigo carmine, Acid red 183, Acid blue 161 and Acid yellow 17 with maximum adsorption capacity of 92, 70, 75, 60 mg/g [25]. Recently, oxidized multiwalled carbon nanotubes (MWCNTs-COOH) and gold nanoparticle loaded on activated carbon (Au-Np-AC) have been reported for adsorptive removal of BTB from aqueous solution with the saturation capacity of 55.52 and 95.24 mg/g, respectively [26,27]. In present study, a composite of chitosan-a natural biodegradable polymer with citric acid modified bamboo sawdust and iron oxide nanoparticles was prepared, which would be non-toxic, acid resistant, highly efficient and easily recoverable adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Enhanced adsorptive removal of a model acid dye bromothymol blue from aqueous solution using magnetic chitosan‐bamboo sawdust composite: Batch and column studies

Khan

Nazir

2015

Env Prog and Sustain Energy

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The removal of an acid dye bromothymol blue (BTB) from aqueous solution using Fe2O3/chitosan‐bamboo sawdust (FeCBSD) composite was studied. Isotherm modeling indicated that the data best followed Langmuir isotherm, with adsorption capacity (qm) of 217.39 mg/g at a contact time of 30 min and an adsorbent dose of 0.5 g/L. In column studies, the data fitted well into the Thomas model with an adsorption capacity of 225.13 mg/g at a flow rate of 20 mL/min and a bed height of 5 cm. The breakthrough capacity, breakthrough time and exhaustion time decreased with the increasing flow rate. The adsorption process followed pseudo‐second order kinetics, which was controlled by both liquid‐film and intra‐particle diffusion mechanisms. The negative values of ΔGo (7.24–10.94 kJ/mol), positive values of ΔHo (41.27–109.13 kJ/mol) and ΔSo (0.15–0.38 J/mol/K) indicated spontaneity, endothermic nature and an increased randomness at solid‐solution interface, respectively. The results indicated that the FeCBSD effectively removed BTB from wastewater, which may be magnetically recovered. © 2015 American Institute of Chemical Engineers Environ Prog, 34: 1444–1454, 2015

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Kinetic and isotherm study of Bromothymol Blue and Methylene blue removal using Au-NP loaded on activated carbon

Cited by 26 publications

References 43 publications

Comparative study of acid yellow 119 adsorption onto activated carbon prepared from lemon wood and ZnO nanoparticles loaded on activated carbon

Comparative study of acid yellow 119 adsorption onto activated carbon prepared from lemon wood and ZnO nanoparticles loaded on activated carbon

Sonochemical assisted hydrothermal synthesis of ZnO: Cr nanoparticles loaded activated carbon for simultaneous ultrasound-assisted adsorption of ternary toxic organic dye: Derivative spectrophotometric, optimization, kinetic and isotherm study

Enhanced adsorptive removal of a model acid dye bromothymol blue from aqueous solution using magnetic chitosan‐bamboo sawdust composite: Batch and column studies

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