Usage of fruit-fibers of Luffa cylindrica for the sorptive removal of Direct Blue 15 dye from water (original) (raw)
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Adsorption of Common Laboratory Dyes Using Natural Fibers from Luffa cylindrica
Journal of Chemical Education, 2018
Adsorption of methylene blue and malachite green was carried out using Luf fa cylindrica sponges as adsorbing material. We provide a very illustrative exercise about the use of common natural materials requiring little preparation to solve environmental tasks in a routine laboratory situation such as using dyes. In addition, the experiment can be used in different study levels. We illustrate the use of spectrophotometric techniques, calibrations, or (in a more advanced level) calculations of adsorption kinetics and the use of statistical tools in data treatment. The use of natural fibers to remove dyes from laboratory wastewater highlights the environmental responsibility of undergraduate students by training them to treat common laboratory pollutants, and on the other hand, it offers an efficient tool to illustrate water remediation procedures.
Dye adsorption behavior of Luffa cylindrica fibers
Journal of Hazardous Materials, 2008
Using natural Luffa cylindrica fibers as adsorbent removal of methylene blue dye from aqueous solutions at different temperatures and dye concentrations was investigated in this study. Thermodynamics and kinetics of adsorption were also investigated. The adsorption isotherms could be well defined with Langmuir model instead of Freundlich model. The thermodynamic parameters of methylene blue (MB) adsorption indicated that the adsorption is exothermic and spontaneous. The average MB adsorption capacity was found out as 49 mg/g and average BET surface area of fibers was calculated as 123 m 2 /g.
Water, Air, & Soil Pollution, 2018
In the present work, a biosorbent was produced through the alkaline washing of Brazilian ironwood fruits. Infrared and thermogravimetric analyses showed changes in the obtained biosorbent with the removal of extractives, whose micrograph presents a more fibrous structure for the treated material. The biosorption behavior of the methylene blue dye shows efficiency at pH above five, and at alkaline pH, it reaches removal efficiency of up to 90% for five successive cycles. Adsorption kinetics is fast and fits the pseudo-second-order model, which, with the best fit of the Langmuir isotherm model, indicates a chemical adsorption mechanism. The thermodynamic trials express the spontaneity of biosorption and enthalpy and entropy variations of − 10.47 kJ mol −1 and 51.84 J mol −1 K −1 , respectively. The maximum biosorption capacity is of 125.2 mg g −1 for the temperature of 25°C, consisting in a low-cost alternative for the removal of this type of contaminant from an aqueous medium.
Arabian Journal of Geosciences, 2016
Contamination of surface water and groundwater by organic pollutants is a serious problem due to their persistence, bioaccumulation and biomagnification through food webs. Since the removal of dyes from wastewater is considered an environmental challenge and government legislation requires textile wastewater to be treated, therefore there is a constant need to have an effective process that can efficiently remove these dyes. The aim of the present study is to evaluate the potentiality of dried Carpobrotus edulis plant as low-cost adsorbent for the removal of the industrial acid blue 113 dye from aqueous solutions using the batch equilibration technique. The effects of different physicochemical parameters such as adsorbent dose, contact time, initial dye concentration, solution pH and temperature on adsorption rate of anionic AB113 dye on microparticles of dried C. edulis plant were investigated. The experimental data were analyzed by using mathematical models to determine the thermodynamic parameters. The negative values of free energy change indicated the spontaneous nature of the adsorption and negative value of enthalpy change suggested the exothermic nature of the adsorption process. These results indicate that dried C. edulis plant as an environmentally friendly adsorbent could be potentially used for the removal of anionic dyes from aqueous solutions.
International Journal of Industrial Chemistry, 2016
In the present study, biomass fiber (Luffa cylindrica) has been successfully used as biosorbent for the removal of a cationic dye namely, methylene blue, from aqueous solution using a batch process. The characterization of the biosorbent was carried out by the infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The chemical composition has been established by the energy dispersive X-Ray spectroscopy (EDS). The effects of various parameters such as the contact time (0-160 min), solution pH (2-10), biosorbent dose (0.5-8 g L-1), particle size, initial MB concentration (20-300 mg L-1) and temperature (20-60°C) were optimized. The biosorption isotherms were investigated by the Langmuir, Freundlich, Dubinin-Radushkevich and Tempkin models. The data were well fitted with the Langmuir model, with a maximum biosorption capacity of 49.46 mg g-1 at 20°C. The kinetics data were analyzed by the pseudo-first-order and pseudo-second-order models. The mass transfer model in terms of interlayer diffusion was applied to examine the mechanisms of the rate-controlling step (R 2 = 0.9992-0.9999). The thermodynamic parameters: free energy (DG°=-5.428 to-3.364 kJ mol-1), enthalpy (DH°=-20.547 kJ mol-1) and entropy (DS°=-0.052 kJ mol-1 K-1) were determined over the temperatures range (20-60°C). The results indicate that Luffa cylindrica could be an interesting biomass of alternative material with respect to more costly adsorbents used nowadays for dye removal.
The waste management becomes particular nowadays and waste conversion into valuable materials is one of the promising alternative capable of reducing the resource depletion rate. The performance of lignocel-lulosic residues, pineapple plant stem (PPS) for cationic (Basic Blue 3, BB3) and anionic (Congo Red, CR) dyes removal has been evaluated in a batch process, using different parameters such as, pH, contact time, agitation rate, initial dye concentration and sorbent dosage. The kinetics of both dyes sorption fitted well with pseudo-second order kinetic model. Boundary layer effect and intraparticle diffusion models were applied to study the rate-limiting step. The isotherm data of BB3 could be well described by Freundlich model (r 2 = 0.998) whilst high coefficient of determination of CR obtained from Langmuir (r 2 = 0.999) and Temkin (r 2 = 0.996) models. The maximum sorption capacities for BB3 and CR were found to be 58.983 and 11.966 mg g −1 , respectively under a favourable sorption process. The BB3 and CR adsorption on PPS was found to be exothermic. The result suggests that PPS has higher affinity on cationic than anionic dye. The promising regeneration capability of PPS using acid, implied PPS was a potential biosorbent for BB3 removal.
A natural sorbent, Luffa cylindrica for the removal of a model basic dye
Journal of Hazardous Materials, 2010
In this work, application of Luffa cylindrica in malachite green (MG) removal from aqueous solution was studied in a batch system. The effect of contact time, pH and temperature on removal of malachite green was also investigated. By the time pH was increased from 3 to 5, the amount of sorbed malachite green also increased. Beyond the pH value of 5, the amount of sorbed malachite green remains constant. The fits of equilibrium sorption data to Langmuir, Freundlich and Dubinin-Radushkevich equations were investigated. Langmuir isotherm exhibited best fit with the experimental data. Monolayer sorption capacity increased with the increasing of temperature. Sorption kinetic was evaluated by pseudo-first-order, pseudo-second-order, Elovich rate equations and intraparticle diffusion models. It was inferred that sorption follows pseudo-second-order kinetic model. Thermodynamic parameters for sorption process were also found out. Spontaneous and endothermic nature of sorption was obtained due to negative value of free energy ( G • ) and positive value of enthalpy ( H • ) changes. FTIR analyses were also conducted to confirm the sorption of malachite green onto L. cylindrica.
Removal of basic dye methylene blue by using bioabsorbents Ulva lactuca and Sargassum
In the present study, the removal of textile dye methylene blue was studied by adsorption technique using adsorbents such as, alumina, Ulva lactuca and Sargassum (Maine algae). The batch technique was adopted under the optimize condition of amount of adsorbent, stay time, concentration, temperature and pH. By using uv spectrophotometer, concentration of dye was measured before and after adsorption. The removal data were fitted into the Langmuir and Freundlich adsorption isotherm equations. The values of their corresponding constants were determined. Thermodynamic parameters like free energy (∆G), enthalpy (∆H) and entropy (∆S) of the systems were calculated by using Langmuir constant (K). The values of % removal and K D for dye systems were calculated at different temperatures ranging (303 -318 K) with the intervals of 5 ± 2°C. The present study shows that about 96% removal of dye was obtained by using biosorbents.
DESALINATION AND WATER TREATMENT
Potato peels (PP) and peanut hulls (PH) have been used as biosorbents to remove Methylene Blue (MB) from aqueous solution. By using Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and X ray diffraction (XRD) analysis, PP and PH have been characterized. FTIR analysis confirmed the presence of carboxyl and phenolic hydroxyl groups which constitute the major adsorption sites onto PP and PH. SEM micro photographs indicated the presence of tiny pores on the adsorbent surface responsible for sorption process. XRD showed the presence of crystalline structures in both adsorbents. The effect of different parameters on adsorption was investigated, and conditions were optimized. The equilibrium and kinetics data obtained were analyzed using different models. The adsorption data confirmed second order kinetics and Langmuir Isotherm to be the best fit model for both adsorbents. Thermodynamic studies showed that the sorption process of MB was endothermic and more effective at lower temperatures. The results demonstrated that PH powder has a sufficient potential as an efficient adsorbent material for the removal of basic dyes from textile wastewater. The maximum removal efficiency of PH obtained was 98.1 % and that of PP was 92.7 %.
Scientific Reports
This work is devoted to the adsorption of Cibacron Blue (CB) an anionic textile dye, on bean peel (BP) an agricultural waste with neither activation nor carbonization. The adsorption was realized in batch configuration at ambient temperature in acidic medium. The adsorbent was characterized by FTIR, SEM and BET analyses; the equilibrium isotherms and kinetics were also studied. It has been found that this waste could be used as a low-cost biosorbent for CB elimination under optimal working conditions. The rate of CB elimination reaches 95% on bean bark (3.6 g/L) at pH 2.2 and a reject concentration of 25 mg/L. The pseudo-second-order describes suitably the experimental data and the external diffusion is the rate-determining step. The Freundlich isotherm fits better the CB adsorption with a correlation coefficient (R2) of 0.94 and an RMSE = 1.5115. The negative enthalpy (ΔH) and free enthalpy (ΔG°) indicate a physical and spontaneous nature of the CB biosorption onto the biomaterial.