Sorption equilibrium of selected azo dyes onto low-cost sorbents (original) (raw)
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Novel studies are designed to investigate unconventional plant/natural lignocellulosic products as adsorbents. The aim of the study was to evaluate the process of acid dye (Direct Orange 26) sorption onto plant sorbent (rye straw) as an alternative method of water treatment, allowing for the removal of harmful contaminants in a packed column. Packed columns play a key role in the processes of water treatment and sewage purification. Experiments were carried out in a laboratory column for differential flow rate, height of bed and initial concentration of dye. A mathematical model to calculate the concentration of solution at the column outlet and the concentration of adsorbed substance in the adsorbent, as well as breakthrough curves for different process conditions was proposed in the study. Calculations were carried out in the Matlab computing environment. Assessment of statistical parameters confirmed a good fit to experimental data for most cases.
Equilibrium sorption of anionic dye from aqueous solution by palm kernel fibre as sorbent
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Palm kernel fibre was investigated for its ability to perform as a suitable sorbent for anionic dye from aqueous solution. The effect of sorbent dose and temperature was investigated using a batch sorption technique. The results revealed the potential of palm kernel fibre, an agricultural waste, as a low-cost sorbent for the anionic dye examined. The isotherm data were closely fitted to the Langmuir equation and the dye sorption capacity of palm kernel fibre increased as the sorbent dose decreased. Maximum saturated monolayer sorption capacity of palm kernel fibre for 4-bromoaniline-azo-1,8-dihydronaphthalene-3,6-disodiumsulphate was 38.6 mg/g. Thermodynamic parameters such as change in the free energy, the enthalpy, and the entropy were also evaluated. In addition, relationships between sorbent dose and Langmuir constants were developed and are presented.
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The International Conference on Chemical and Environmental Engineering, 2014
Bare palm fibre was investigated for its ability to perform as a suitable sorbent for methylene blue dye from aqueous solution. The effect of sorbent dose and temperature was investigated using a batch sorption technique. The results revealed the potential of palm fibre, an agricultural waste, as a low-cost sorbent for the dye examined. The isotherm data were closely fitted to the Langmuir and Frendlich equations and the dye sorption capacity of palm increased as the sorbent dose decreased. Maximum saturated monolayer sorption capacity of bare palm branches for methylene blue dye was investigated. Reaction parameters such as change in particle size of the sorbent material, sorbent mass, air flow rate, initial dye concentration and the medium temperature were also evaluated. In addition, relationships between sorbent dose and Langmuir; Frendlich constants were developed and are presented. The principal conclusions of the study are that the reaction follows the pseudo first order reaction kinetics.
Sorption of water soluble dyes using inorganic materials as sorbents
Indian Journal of Chemical Technology, 2006
Ion exchange technique has been used for treatment of wastewater containing dyes. Zirconium molybdate (ZM) an inorganic cation exchanger of the class of tetravalent metal acid salt has been used for the purpose. Sorption of dyes namely crystal violet (CV), methyleneblue (MB) and rhodamine6G (R6G) has been carried out on zirconium molybdate by varying pH and flow rate. The dyes can be effectively recovered by using dilute acids such as HCl, HNO 3 and H 2 SO 4. Similar studies have also been carried out using zirconia (ZO) for comparison. Considerable differences in the binding of the dyes tested, have been observed. In general, heteropolycyclic dyes exhibit more affinity towards ZM as compared to ZO.
ERJ. Engineering Research Journal, 2015
Bare palm fibre was investigated for its ability to perform as a suitable sorbent for methylene blue dye from an aqueous solution. The effect of sorbent dose and temperature was investigated using a batch sorption technique. The results revealed the potential of palm fibre, an agricultural waste, as a low-cost sorbent for the dye examined. The isotherm data were closely fitted to the Langmuir and Frendlich equations and the dye sorption capacity of palm increased as the sorbent dose decreased. Maximum saturated monolayer sorption capacity of bare palm branches for methylene blue dye was investigated. Reaction parameters such as change in particle size of the sorbent material, sorbent mass, air flow rate, initial dye concentration and the medium temperature were also evaluated. In addition, relationships between sorbent dose and Langmuir; Frendlich constants were developed and are presented. The principal conclusions of the study are that the reaction follows the pseudo first order reaction kinetics.
Surface Modification of Biomass and Enhancing Sorption Capacity of Azo-dyes
Research Square (Research Square), 2023
The effectiveness of citric acid modi ed biomasses Rice Husk (RH) and Water Hyacinth (WH) in removing Congo Red (CR) dye from its aqueous solution was studied. The modi ed biosorbents were characterized using FTIR and SEM. The optimum conditions of parameters-pH, adsorption time and adsorbent dosage, were evaluated using Box-Behnken Design (BBD) and Response Surface Methodology (RSM) to maximize dye removal. For WH the optimum removal was 91.4% in time 22.649 minutes, at pH of 2.0 and adsorbent dosage of 0.198 g for 20mL of dye, which was obtained with a regression coe cient R 2 value of 0. 9905. Whereas for RH the optimum was 88.204% removal in 34.048 minutes, at pH of 2.0 and adsorbent dosage of 0.189 g in 20mL of dye with R 2 value of 0.9828. The model of the mechanism of adsorption and the multi-factor interactions were arrived at through statistical modelling and testing of the adsorption equilibrium data. Overall, this research focuses on sustainable and effective methods for removing Congo Red dye from water using modi ed agricultural waste biomass.
International Journal of Environmental Science and Technology
In this work, the biosorption ability of Sarocladium sp. dried biomass to remove Remazol Black dye has been studied. Optimum inoculum size and initial dye concentration were determined, and the salinity effect on the dye removal was evaluated. In the following, kinetic and isotherm of the adsorption were studied, and the adsorbent characteristics were determined using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, zeta potential, and Brunauer-Emmett-Teller analysis. Based on the results, maximum and minimum dye removal was determined at 1000 and 200 mg L −1 of Remazol Black dye as 54.39 and 24.02 mg g −1 , respectively. Among the various azo dyes including Reactive yellow 145, Reactive blue 222, Reactive red 43, Direct blue 21, and Acid blue 161, dye removal capability of 87.96-97.43% was obtained. The solution salinity showed positive effect on the biosorption process. The biomass pretreatment with calcium nitrate enhanced the removal capacity by 70.48% and the maximum reduction in dye removal (− 61%) was obtained when the fungal biomass was treated by sodium hydroxide. Biosorption kinetic follows the first-pseudo-order model, and the obtained data best fits both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of dried biomass for dye removal was 58.48 mg g −1. Based on FTIR, zeta potential value and pretreatment results, Yoshida H-binding, dipole-dipole H-binding, π-π and n-π interactions were probably involved in the dye adsorption process. The results showed that biomass has a high potential for different dyes adsorption from real textile wastewater. The present study declares the high potential of Sarocladium sp. dried biomass as an effective and inexpensive biosorbent which can be used for bio-treatment of effluents with multi-dyes.
Sorption of Methylene Blue Dye from Aqueous Solution Using an Agricultural Waste
Trends in Green Chemistry, 2017
Millions of tons of prickly (peel) bark of cactus fruit (PBCF) are produced per year. This work is to use this agricultural waste as a low cost biomaterial for the treatment of water contaminated with organic pollutant. PBCF has been characterized by several analytical techniques i.e. SEM, EDS and FTIR spectroscopy. In addition, the determination of iodine value which gives information on area surface. PBCF were used to remove Methylene blue (MB) from the aqueous solution. Experiments were carried out as function of contact time, initial dose of PBCF, initial pH aqueous solution, initial concentration of MB (90-2000 mg L-1), and temperature (20-40°C). The pseudo-second-order was the best applicable model to describe the sorption of MB by Prickly bark of cactus fruit. The equilibrium sorption data of Methylene blue by Prickly barks of cactus fruit were analysed by Langmuir and Freundlich models. The preliminary results indicate that the Langmuir model provides the best correlation of the experimental data with an important capacity of sorption of Methylene blue onto Prickly bark of cactus fruit (222.22 mg g-1). Moreover the parameters of the Freundlich model showing that the sorption of MB onto PBCF is favourable. Finally, the sorption capacity of PBCF is compared to those of other sorbents materials reported in the literature.
Kinetic considerations of textile dyes adsorption from water on a sorbent from cellulosic waste
Studia Universitatis Babeș-Bolyai Chemia
The synthesis of a new sorbent based on waste cotton cellulose and kinetics of adsorption of reactive textile dye from aqueous solution are the subject of the study in this manuscript. The sorbent is made of waste cotton fibbers collected from the textile plants for spinning yarn and weaving fabrics after being physically and chemically modified. Qualitative and quantitative characterization of the sorbent shows that carbon is dominant in the chemical composition. The sorbent used is a relatively finely divided material with heterogeneous porous particles, generally below 300 µm in size. Maximum adsorption capacity and the rate constant of the pseudo-second order generally depend on the amount of the cellulose-based sorbent, the initial dye concentration and the temperature. A new kinetic model based on the results of adsorption capacity and pseudo second order rate constant was defined. The low value of the activation energy means that the adsorption is mostly of a physical nature. Thermodynamic parameters, change of free Gibb's energy, change of enthalpy and change of entropy, as well as activation energy according to the standard equation confirm the adequacy of the new kinetic model of dye adsorption.