Kinetics, isotherm, and thermodynamic studies of methylene blue adsorption from water by Mytella falcata waste

Silva, Társila S.; Meili, Lucas; Carvalho, Sandra Helena Vieira de; Soletti, João Inácio; Dotto, Guilherme L.; Fonseca, Eduardo J.S.

doi:10.1007/s11356-017-9645-6

Cited by 27 publications

(12 citation statements)

References 46 publications

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“…The enthalpy value between 0 and − 40 kJ mol −1 presupposes a physisorption phenomenon. According to the positive S 0 , possibly some structural changes or readjustments in the adsorbate-adsorbent complex occurred demonstrating that the interaction is entropycontrolled (Silva et al 2017;Lütke et al 2019;Meili et al 2019;dos Santos Lins et al 2019). Similar results were obtained by Beltrame et al (2018) and Anastopoulos and Pashalidis (2019), using activated carbon fibers from pineapple leaves and oxidized activated carbon derived from Luffa cylindrica for caffeine removal, respectively.…”

Section: Thermodynamic Studiessupporting

confidence: 75%

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Melo

Ide

Duarte

et al. 2020

Environ Sci Pollut Res

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The palm (Elaeis guineensis), known as dendê, is an important oleaginous Brazilian plant with a high performance of oil production. In this work, a 2 3 full experimental design was performed and the response surface method (RSM) was used to indicate the optimum parameter of caffeine adsorption on Elaeis guineensis endocarp activated carbon, since the endocarp is the main by-product from dendê oil production. It was set the adsorbent point of zero charge (pH pzc), and the material was characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The RSM results indicate removal efficiency (%) at the optimal conditions, 0.20 g of adsorbent, and caffeine initial concentration of 20 mg/L, and acidic medium was about 95%. Based on ANOVA and F test (F calculated > F standard), the mathematical/statistical model obtained fits well to the experimental data. The overall kinetic studies showed time was achieved after 5 h and caffeine adsorption followed the pseudo-second-order model suggesting chemisorption is a predominant mechanism. Redlich-Peterson and Sips models best represented the experimental data (0.967 < R 2 < 0.993). Thermodynamic revealed that caffeine adsorption was spontaneous at all temperatures studied, exothermic, and probably with changes in the adsorbate-adsorbent complex during the process. The tests conducted in different water matrixes corroborate the suitability of this adsorbent to be used in caffeine removal even in a complex solution.

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Section: Thermodynamic Studiessupporting

confidence: 75%

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Melo

Ide

Duarte

et al. 2020

Environ Sci Pollut Res

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“…The presence of NH and NH 2 in the product can be attributed to proteinaceous compounds of mollusk shells, while OH originates from Si–OH or water trapped in the silicate backbone. 23 , 24 …”

Section: Results and Discussionmentioning

confidence: 99%

“…It works as a flux for glass devitrification, template for imprinting the silicate backbone of glass, source of char for enhancing the adsorption capacity of the glass-based adsorbent, and source of porogenic gases and materials. 14 − 16 …”

Section: Introductionmentioning

confidence: 99%

Thermochemical Conversion of Waste Glass and Mollusk Shells into an Absorbent Material for Separation of Direct Blue 15 Azo Dye from Industrial Wastewater

et al. 2020

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The objective of the presented work was to convert waste glass and mollusk shells into a porous material for separation of the direct blue 15 azo dye from industrial wastewater. The porous glass material of specific pore size and surface area was prepared through a thermochemical reaction by reacting waste glass with mollusk shells, soda, and rock salt. The optimal reaction conditions were determined by adjusting the reaction time, reaction temperature, and relative amount of the reactants. The surface morphology, elemental composition, and functional groups of the material were studied through scanning electron microscopy (SEM), X-ray florescence spectroscopy (XRF), energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy (FT-IR). Barrett–Joyner–Halenda (BJH) and Brunauer–Emmett–Teller (BET) methods were used to determine the pore size distribution and surface area of the porous material. The material consisted of different types of flakes, oval-shaped particles, and granules. In addition to the functionalized char, the porous material contained Si–O–Si, Si–O–Al, and Si–OH groups. Relatively better yield and pore size distribution were obtained at a reaction temperature of 800 °C and reaction time of 90 min. The fully characterized material was used to separate the blue dye from industrial wastewater. This porous material absorbed about 2.66 mg/g blue dye from wastewater after 20 min of treatment time. The adsorption data fit the Freundlich isotherm better than the Langmuir isotherm. The correlation coefficient of Freundlich isotherm varied from 0.93 to 0.98, which was slightly higher than the correlation coefficient of Langmuir isotherm.

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“…The result of the FTIR analysis of the porous waste glass particles is shown in Figure 3 [24]. In general, the various peaks in the spectra confirmed the presence of silicates, carbon, metal oxides, and metal halides in the waste glass particles [3].…”

Section: Ftir Spectra Of Waste Glassmentioning

confidence: 86%

Waste glass: An excellent adsorbent for crystal violet dye, Pb2+ and Cd2+ heavy metals ions decontamination from wastewater

Sodeinde

Olusanya

Momodu

et al. 2021

J. Nig. Soc. Phys. Sci.

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The suitability of waste glass as an eco-friendly adsorbent for the removal of crystal violet (CV) dye, Pb2+ and Cd2+ heavy metal ions in waste water samples was investigated in batch mode. Waste glass sample was pulverized and characterized by SEM/EDX, XRD, BET and FTIR. Effects of variation in temperature, pH, contact time and recyclability of the adsorbent were studied. FTIR spectra revealed major peaks around 491.53 and 3444.12 cm-1 corresponding to the bending vibrations of Si-O-Si and -OH groups respectively. SEM/EDX analysis showed a dense, coarse, porous morphology with predominantly silica component. The effective surface area and size of the adsorbent were 557.912 m2/g and 2.099 nm respectively. Increase in temperature, dosage, contact time resulted in increase in adsorption efficiency. Optimum adsorption efficiency of 94%, 97.5% and 89.1% was attained for Pb2+ , Cd2+ ions and CV dye respectively at 70?C. Adsorption process followed more accurately pseudo-first order model and isotherm fitted perfectly into Freundlich model indicating a multilayer adsorption mechanism for CV dye and the heavy metals. 89.87% reduction in Chemical Oxygen Demand (COD) level of wastewater was reported upon treatment with waste glass adsorbent affirming its efficiency for dye and heavy metal pollutants removal.

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Kinetics, isotherm, and thermodynamic studies of methylene blue adsorption from water by Mytella falcata waste

Cited by 27 publications

References 46 publications

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Caffeine removal using Elaeis guineensis activated carbon: adsorption and RSM studies

Thermochemical Conversion of Waste Glass and Mollusk Shells into an Absorbent Material for Separation of Direct Blue 15 Azo Dye from Industrial Wastewater

Waste glass: An excellent adsorbent for crystal violet dye, Pb2+ and Cd2+ heavy metals ions decontamination from wastewater

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