Sandpaper Wastes as Adsorbent for the Removal of Brilliant Green and Malachite Green Dye (original) (raw)
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Equilibrium and kinetic adsorption study of aqueous basic dye solutions using waste foundry sand
International Journal of Global Warming, 2017
The aim of this study is to evaluate adsorption kinetics, isotherms and thermodynamic parameters of crystal violet (CV) and methylene blue (MB) dyes from aqueous solution using waste foundry sand. Adsorption studies were carried out at different initial dye concentrations (12.5-400 mg l-1), contact time (5-240 min), pH (3.0-9.0), sorbent doses (0.125-2 g l-1) and adsorption temperature (20°C-70°C). The equilibrium adsorption data were analysed by Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (DRK) adsorption isotherm models. Of the four adsorption isotherms, the R 2 value of Langmuir isotherm model for MB and CV were 0.969 and 0.926, respectively. Experimental data were analysed using the pseudo-first order, the pseudo-second order, intraparticle diffusion and Elovich models. The characteristic parameters for each model have been determined. In addition, the equilibrium thermodynamic parameters, including changes in Gibbs free energy, entropy and enthalpy are determined for the CV and MB on waste foundry sand.
E3S Web of Conferences
In many countries, water pollution from industrial wastewater is a serious problem. This type of pollution can have a harmful impact on the environment, to reduce the effects of these pollutants, several physico-chemical methods are implemented, in particular adsorption on bioadsorbents, it is a common process to remove traces of pollutants from water, the aim of our work is to realize a comparative experimental study of isotherms and adsorption kinetics of methylene blue (MB) on three substrates: sugar cane bagasse (SCB), almond shell (AS) and walnut shell (WS). The results of equilibrium kinetics show that walnut shell (WS) binds better to methylene blue than other substrates. The results also show that the adsorption kinetics are described by the expression of the pseudo-second order model. The isotherms of adsorption of methylene blue (MB) by sugarcane bagasse (SCB), walnut shell (WS) and almond shell are perfectly described by Langmuir's model and that walnut shell adsorbs ...
N the present paper, natural adsorbents such as starch, …..sawdust (collected from a local sawmill) and orange peel were grafted in order to remove C.I. Basic Blue 41 (BB 41) from aqueous solution by adsorption. Batch mode experiments were conducted at 30ºC to study the effects of pH, adsorbent mass and contact time (0-240 min). Equilibrium adsorption isotherms and kinetics were investigated. The experimental adsorption data were analyzed by the Langmuir and Freundlich isotherms. The results showed that adsorption capacity is dependent on the pH, initial concentration of dye and contact time. Changes in the surface chemical groups in the adsorbent starch, orange peel and sawdust waste materials were investigated via Fourier transform infrared (FTIR). In the case of starch and sawdust the OH group after grafting is reduced while the carboxylic group is increased and vice versa after adsorption of a dye, indicating that the adsorption of dye is occurred between carboxylic groups and cationic group in basic dye. But in the case of orange peel the result is conversely. Equilibrium isotherms were well described by the Langmuir equation, giving maximum adsorption capacity of 19.2 mg/g by sawdust adsorbent at 30 • C. The adsorption kinetics can be well represented by the pseudo-second-order model equation.
Journal of Advanced Scientific Research
In this paper, studies for the removal of malachite green dye from aqueous solution using adsorption technique are presented. There are different adsorbent available for malachite green dye removal from water effluents. Hence, the recent literature in the area is categorized according to the cost, feasibility, and availability of adsorbents. An extensive survey of the adsorbents, derived from various sources such as low-cost biological materials, waste material from industry, agricultural waste, polymers, clays, nano-materials, and magnetic materials, has been carried out. Adsorbent unsaturated polyester resin is case effective for the removal of malachite green dye from aqueous solution. The research paper studies different adsorption factors, such as pH, concentration, adsorbent dose, contact time, temperature. The fitting of the adsorption data to various models, isotherms, kinetic and thermodynamic parameter is also reported.
Utilization of industrial waste products as adsorbents for the removal of dyes
Journal of Hazardous Materials, 2003
A number of low cost adsorbents from steel and fertilizer industries wastes have been prepared and investigated for the removal of anionic dyes such as ethyl orange, metanil yellow and acid blue 113 from aqueous solutions. The results indicate that inorganic wastes, i.e. blast furnace dust, sludge and slag from steel plants are not suitable for the removal of organic materials, whereas a carbonaceous adsorbent prepared from carbon slurry of fertilizer industry was found to adsorb 198, 211 and 219 mg/g of ethyl orange, metanil yellow and acid blue 113, respectively. The adsorption of dyes on this adsorbent was studied as a function of contact time, concentration, particle size and temperature by batch method. The adsorption isotherm conformed to Langmuir model and the adsorption was found to be exothermic and physical in nature. Kinetic data conforms to Lagergren’s equation with good correlation coefficients varying from 0.9998 to 0.9999 indicating that the adsorption is a first-order process. The adsorption data on carbonaceous adsorbent was compared to a standard activated charcoal sample and it was found that the prepared adsorbent is about 80% as efficient as standard activated charcoal and therefore, can be used as low cost alternative (∼US$ 100 per ton) for colour removal from effluents.
Paper Industry Waste Sludge: A Low-Cost Adsorbent for Removal of Malachite green Dye
Asian Journal of Chemistry, 2016
In the present work, paper industry waste sludge has been used as a low-cost adsorbent for the investigation of adsorption isotherms, kinetics and thermodynamic parameters of Malachite green dye adsorption from aqueous solution. Three kinetic models, pseudo-firstorder, pseudo-second-order and intra-particle-diffusion model have been used to predict the adsorption rate constants. The kinetics of adsorption has been best described by pseudo-second-order model and is supported by intra-particle-diffusion model. The equilibrium adsorption capacity has been determined by subjecting the experimental data to Langmuir, Freundlich and Temkin isotherms. The thermodynamic parameters such as; change in free energy, enthalpy and entropy have been calculated.
A novel agricultural waste adsorbent for the removal of cationic dye from aqueous solutions
Journal of Hazardous Materials, 2009
In this paper, pineapple stem (PS) waste, an agricultural waste available in large quantity in Malaysia, was utilized as low-cost adsorbent to remove basic dye (methylene blue, MB) from aqueous solution by adsorption. Batch mode experiments were conducted at 30 • C to study the effects of initial concentration of methylene blue, contact time and pH on dye adsorption. Equilibrium adsorption isotherms and kinetic were investigated. The experimental data were analyzed by the Langmuir and Freundlich models and the isotherm data fitted well to the Langmuir isotherm with monolayer adsorption capacity of 119.05 mg/g. The kinetic data obtained at different concentrations were analyzed using a pseudo-firstorder and pseudo-second-order equation and intraparticle diffusion equation. The experimental data fitted very well the pseudo-second-order kinetic model. The PS was found to be very effective adsorbent for MB adsorption.
IOP Conference Series: Materials Science and Engineering
This work was aimed to evaluate the capability of activated carbon prepared from Bamboo (Bambusa bambos) stems (BS) to remove two reactive dyes, which are Malachite Green G (MGG) and Reactive Red 2 (RR2) from aqueous media. The presently proposed activated carbon was prepared using the chemical activation. The activated carbon was also characterized by means of the Fourier Transform Infrared Spectrometry and Field Emission Scanning Electron Microscopy. To investigate the kinetic and isotherm characteristics, the adsorption tests were carried out in a batch experiment and then several mathematical models were employed for describing the experimental data. The present work has found that the proposed activated carbon was capable to remove the dyes with an adsorption capacity of 3.80 mg/g and 2.22 mg/g of MGG and RR2, respectively, for 60 min. The equilibrium data were described well by Freundlich isotherm model for both MGG and RR2. The pseudo-second-order model performed well the experimental kinetic data.
DESALINATION AND WATER TREATMENT
The removal of Congo red dye from aqueous solutions by adsorption reaction onto three distinct adsorbents: graphene oxide (GO), graphene oxide-grafted-3,3'-diaminobenzidine (GO/ DAB), and GO/DAB-grafted-ethylenediaminetetraacetic acid (GO/DAB/EDTA) was investigated in batch experiments. The study of the effects of pH and contacting time on adsorption systems is the first step in optimizing them. The results revealed that depending on the type of adsorbent, the optimum pH values and periods differed. The Congo red (CR) dye adsorptions onto the investigated adsorbents GO, GO/DAB, and GO/DAB/EDTA required pH (3.0, 7.0, and 5.0, respectively) and time (60, 30, and 45 min). The fundamental adsorption properties of the dye were evaluated using adsorption equilibrium isotherms, namely the Langmuir, Freundlich, and Dubinin-Radushkevich models. The maximum adsorption values (q max) were calculated using the Langmuir isotherm results, and they were 1,250; 1,428.5 and 1,438.1 mg/g for the adsorption of CR dye onto adsorbents GO, GO/DAB, and GO/DAB/EDTA, respectively, and these results proved the preference for prepared GO-derivatives over GO. The kinetic models, namely pseudo-first-order and pseudo-second-order, were employed to understand the mechanism of the adsorption process, and they fitted very well with the pseudo-second-order kinetic model, which relies on the assumption that chemisorption may be the rate-limiting step. This study reveals that the presence of functional groups and active sites on the studied adsorbent contributed to its high affinity for CR dye adsorption. As a result, they can be used as efficient and cost-effective dye adsorbents in industrial effluent. Thermodynamic parameters including enthalpy ΔH°, entropy ΔS°, free energy ΔG°, and activation energy E a of the adsorption process were calculated and used to interpret the results, which revealed that the adsorption systems were a spontaneous and endothermic process for GO and its composites. Also, low activation energy values (E a < 40 kJ/mol) were characteristics of the physisorption mechanism and diffusion-controlled process.