6 research outputs found
Equilibrium, kinetic and thermodynamic study for the efficient removal of malachite green dye onto untreated Morus nigra L. (mulberry tree) leaves powder and its biochar
No full text165-172In the present investigation the removal of malachite green (MG) dye from its aqueous solution by batch mode adsorption study onto mulberry leaves powder (MLP) and mulberry leaves biochar (MLB) has been proved to be efficient with removal percentage more than 95 % at 0.3 gm dose in 35.8 mg/L (20 ml) MG dye solution for 35 minutes. In this batch mode adsorption study various parameters like contact time, effect of dose, concentration, temperature and pH have been studied to investigate the effect of such parameters on MG dye adsorption process onto mentioned adsorbents. Among three commonly used isotherms (Langmuir, Freundlich, and Temkin), Freundlich isotherm model is best fit model with R2 = 0.99. The kinetic study reveals that pseudo-second-order kinetic model is best followed having also R2 = 0.99. Thermodynamically, the adsorption process of MG dye onto MLP is endothermic, exothermic onto MLB, and spontaneous in nature. Accordingly, the results obtained have shown that the adsorbents (MLP and MLB) can be used as low cost, rapid, and effective adsorbents for the removal of malachite green dye from its aqueous solution, thus also from wastewater
A Comparative Study of Adsorption of Methylene Blue Dye onto Untreated Platanus orientalis (chinar tree) Leaves Powder and its Biochar - Equilibrium, Kinetic and Thermodynamic Study
Get PDFIn the present investigation the adsorption behavior of methylene blue (MB) dye from aqueous solution onto untreated chinar leaves powder (CLP) and chinar leaves biochar (CLB) has been studied. To find out optimum conditions, adsorption process was carried out by varying different parameters such as contact time, adsorbent dose, concentration, temperature, salts, and pH. The equilibrium adsorption data were subjected to different popular isotherms (Langmuir, Freundlich, and Temkin) and kinetic models (pseudo-first order, pseudo-second order and intra-particle diffusion model). The thermodynamic study was also done on the adsorption process. The maximum monolayer adsorption capacities for MB dye onto given adsorbents are 1.53 mg/g (CLP) and 1.02 mg/g (CLB). Also the values of RL and n suggest favourable adsorption process of MB dye onto CLP and CLB adsorbents. The pseudo-second order kinetic model is best obeyed by both the mentioned adsorbents for MB dye adsorption with R2 value equal to 1. Thermodynamic study reveals that the adsorption process of MB dye is spontaneous, endothermic (CLB) and exothermic (CLP). At an equilibrium time of 20 min the uptake efficiency (> 99%) was recorded for both the low cost adsorbents (CLP and CLB) thus proved them fast and effective adsorbents for the removal of MB dye
(Chinar tree) leaf powder and its biochar: equilibrium, kinetics and thermodynamics study
No full textOxidative Cleavage of Solbutamol by N- Chloro Saccharin in Aqueous Acetic Acid Medium
No full textKinetic oxidation of Salbutamol by N-Chlorosaccharin, in aqueous Acetic acid medium, shows first-order dependence on [NCSA] and [H+], and fractional order on [Solbutamol]. The variation of [H+] and [Sacharin](reaction product) has a remarked effect on the rate of reaction(rate decreases). Activation parameters for the reaction have been evaluated from the Arrhenius plot by studying the reaction at different temperatures. The stoichiometry was found to be 1:1, and the products of oxidation were found to be 3-hydroxy methyl,4-hydroxy benzene carbaldehyde, Saccharin) and territory ammine as bi-products. The rate law has been derived on the basis of experimental Kinetic data and a plausible mechanism has been proposed
Characterization and adsorption of malachite green dye from aqueous solution onto <i>Salix alba</i> L. (Willow tree) leaves powder and its respective biochar
No full textIn the present study, the use of low-cost, highly efficient, eco-friendly, and abundantly available (in Kashmir region, J&K India) willow leaves from which adsorbents like willow leaves powder (WLP) and willow leaves biochar (WLB) were prepared, have been found to be efficient for malachite green (MG) dye removal and can be used as an alternative to the current expensive methods of removing the same dye from an aqueous solution. The techniques like Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and carbon, hydrogen, nitrogen, sulphur (CHNS) analyser were used to characterize the samples without any chemical treatment. SEM of the adsorbents shows the presence of different sized pores, cracks, and crevices. FTIR and CHNS show functional groups and elemental concentration, respectively. The effects of various experimental parameters such as contact time, adsorbent dosage, initial dye concentration, salt treatment, and pH were investigated and optimal experimental conditions were obtained. It has been found that Langmuir, Freundlich, and Temkin isotherms were useful for describing the equilibrium of adsorption system. The equilibrium adsorption data in this research work was found to follow both Langmuir and Freundlich isotherm models and maximum monolayer capacity of WLP and WLB were found to be 10.014 and 21.244 mg/g, respectively. The experimental data for both WLP and WLB followed pseudo-second-order kinetic model with R2= 0.999. Intraparticle diffusion model reveals that more than one mechanism influenced the adsorption process. Thermodynamic study concluded that the adsorption is spontaneous for both adsorbents but exothermic for WLP and is endothermic in nature for WLB. Present exploration and comparison with other reported adsorbents concluded that, WLP and WLB may be useful as low-cost attractive option for the removal of MG dye from aqueous solution and therefore, also from wastewater containing MG dye. This study reports for the first time the use of Salix alba L. (Willow tree) leaves and its biochar as the adsorbents for the removal of malachite green dye from its aqueous solution.Both the adsorbents namely willow leaves powder (WLP) and willow leaves biochar (WLB) are rapid and highly efficient for MG dye removal having percentage removal more than 92.5%.For WLB adsorbent the percentage removal crosses 98.5% by the addition of 0.2 g KCl and by increasing 40 °C temperatures.The adsorbents used in this research work are comparable with the highly efficient low-cost adsorbents used for MG dye like rice husk, water hyacinth, seaweed, etc. found in the literature.The adsorbents (WLP and WLB) were used without chemical treatment having good removal efficiency, cheap, easy available, and their mode of preparation is simple. This study reports for the first time the use of Salix alba L. (Willow tree) leaves and its biochar as the adsorbents for the removal of malachite green dye from its aqueous solution. Both the adsorbents namely willow leaves powder (WLP) and willow leaves biochar (WLB) are rapid and highly efficient for MG dye removal having percentage removal more than 92.5%. For WLB adsorbent the percentage removal crosses 98.5% by the addition of 0.2 g KCl and by increasing 40 °C temperatures. The adsorbents used in this research work are comparable with the highly efficient low-cost adsorbents used for MG dye like rice husk, water hyacinth, seaweed, etc. found in the literature. The adsorbents (WLP and WLB) were used without chemical treatment having good removal efficiency, cheap, easy available, and their mode of preparation is simple.</p
Equilibrium, kinetic and thermodynamic study for the efficient removal of malachite green dye onto untreated Morus nigra L. (mulberry tree) leaves powder and its biochar
Get PDFIn the present investigation the removal of malachite green (MG) dye from its aqueous solution by batch mode adsorption study onto mulberry leaves powder (MLP) and mulberry leaves biochar (MLB) has been proved to be efficient with removal percentage more than 95 % at 0.3 gm dose in 35.8 mg/L (20 ml) MG dye solution for 35 minutes. In this batch mode adsorption study various parameters like contact time, effect of dose, concentration, temperature and pH have been studied to investigate the effect of such parameters on MG dye adsorption process onto mentioned adsorbents. Among three commonly used isotherms (Langmuir, Freundlich, and Temkin), Freundlich isotherm model is best fit model with R2 = 0.99. The kinetic study reveals that pseudo-second-order kinetic model is best followed having also R2 = 0.99. Thermodynamically, the adsorption process of MG dye onto MLP is endothermic, exothermic onto MLB, and spontaneous in nature. Accordingly, the results obtained have shown that the adsorbents (MLP and MLB) can be used as low cost, rapid, and effective adsorbents for the removal of malachite green dye from its aqueous solution, thus also from wastewater
