scholarly journals Parkia speciosa (Petai) pod as a potential low-cost adsorbent for the removal of toxic crystal violet dye

2016 ◽  
Vol 15 ◽  
Author(s):  
Linda Biaw Leng Lim ◽  
Namal Priyantha ◽  
Hui Hsin Cheng ◽  
Nur Afiqah Hazirah
Keyword(s):  
Adsorption Isotherm ◽  
Crystal Violet ◽  
Low Cost ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Medium Ph ◽  
Crystal Violet Dye ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Optimized Conditions

This study focused on the use of Parkia speciosa (Petai) pod as a potential adsorbent for the removal of crystal violet (CV) dye. Batch adsorption isotherm experiments carried out under optimized conditions were fitted to six isotherm models, namely Langmuir, Freundlich, Temkin, Dubinin-Radushkevich, Redlich-Peterson and Sips. Of these, the Sips model best described the adsorption isotherm of Petai pod for the removal of CV dye, giving a desirable adsorption capacity (qmax) of 163.2 mg g-1. Adsorption kinetics was found to follow the pseudo-second order, and further, intra-particle diffusion played a significant role. This study also revealed that the adsorption of CV by Petai pod is influenced by the ionic strength of the medium. However, Petai pod showed resilience towards changes in medium pH.  

scholarly journals Biosorption potentials of acid modified Saccharum bengalense for removal of methyl violet from aqueous solutions

2017 ◽  
Vol 23 (3) ◽  
pp. 399-409 ◽  
Author(s):  
Muhammad Din ◽  
Kiran Ijaz ◽  
Khalida Naseem
Keyword(s):  
Experimental Data ◽  
Adsorption Isotherm ◽  
Aqueous Medium ◽  
Methyl Violet ◽  
Isotherm Models ◽  
Langmuir Adsorption ◽  
First Order ◽  
Adsorption Isotherm Models ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

In the present work, Saccharum bengalense (SB) was treated with sulfuric acid to enhance its efficiency. Methyl violet (MV), a cationic dye, was removed from aqueous medium using acid modified S. bengalense (A-SB). Different parameters like adsorbent dosage, stirring speed, temperature, contact time and effect of initial concentration of dye on rate of adsorption of dye from aqueous medium was studied. Experimental data obtained from adsorption of MV was analyzed by applying pseudo first order, pseudo second order and intra-particle diffusion models and it was found that the data best follows the pseudosecond order kinetics. Thermodynamic parameters indicate that adsorption reaction was spontaneous, feasible and endothermic in nature. Different adsorption isotherm models, like Langmuir, Freundlich, Dubinin-Radushkevich (D-R) and Temkin, were used to study the mechanism of adsorption process and experimental data was well fitted by the Langmuir adsorption isotherm.

scholarly journals Irreversible sorption of Pb(II) from aqueous solution on breadfruit peel to mitigate environmental pollution problems

2019 ◽  
Vol 80 (12) ◽  
pp. 2241-2249
Author(s):  
Namal Priyantha ◽  
Linda B. L. Lim ◽  
Nur Hakimah Mohd Mansor ◽  
Anushka B. Liyandeniya
Keyword(s):  
Environmental Pollution ◽  
Low Cost ◽  
Error Function ◽  
Isotherm Models ◽  
Artocarpus Altilis ◽  
Adsorption Mechanisms ◽  
Adsorption Sites ◽  
Pseudo Second Order ◽  
Optimized Conditions ◽  
Kinetics Of

Abstract Development of efficient and environmentally friendly methods to remove toxic pollutants from aqueous systems is a requirement to mitigate ever increasing environmental pollution problems. In this context, Artocarpus altilis (breadfruit) peel (BP), a waste material, can be used as a low-cost adsorbent for the removal of Pb(II) ions from synthetic pollutant solutions. The extent of removal of Pb(II), under optimized conditions in experimental batch experiments, is determined to be 82.0%, which is decreased in highly ionic environments, partly due to competition for a limited number of active adsorption sites, indicating the necessity of optimizing experimental parameters for the most efficient removal. Regression analysis and error function values evaluated for isotherm models associated with different adsorption mechanisms, namely Langmuir, Freundlich, Temkin, Dubinin–Radushkevich, Redlich–Peterson and Sips, indicate that the best fitted model is the Sips followed by the Langmuir model with adsorption capacities (qmax) of 78.50 mg g−1 and 85.42 mg g−1, respectively. Thermodynamics arguments support the spontaneous and exothermic behavior of the Pb(II)-BP adsorption system, while adsorption kinetics of the system provides evidence for the applicability of the pseudo second order model with a rate constant of 0.504 g mg−1 min−1.

scholarly journals Adsorption of Crystal Violet onto an Agricultural Waste Residue: Kinetics, Isotherm, Thermodynamics, and Mechanism of Adsorption

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Ilyasse Loulidi ◽  
Fatima Boukhlifi ◽  
Mbarka Ouchabi ◽  
Abdelouahed Amar ◽  
Maria Jabri ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Low Cost ◽  
Agricultural Waste ◽  
X Ray Diffraction ◽  
Almond Shell ◽  
Experimental Conditions ◽  
Batch Mode ◽  
Crystal Violet Dye ◽  
Pseudo Second Order ◽  
Effectiveness And Efficiency

Agricultural waste can be exploited for the adsorption of dyes, due to their low cost, availability, cost-effectiveness, and efficiency. In this study, we were interested in the elimination of crystal violet dye, from aqueous solutions, by adsorption on almond shell-based material, as a low-cost and ecofriendly adsorbent. The almond shells were first analyzed by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction; then, the influence of adsorbent dose, initial dye concentration time, and pH were studied to assess adsorption capacity under optimal experimental conditions. Experimental results indicate that almond shell adsorbent removes about 83% of the dye from the solutions at room temperature and in batch mode; the kinetic study showed that the equilibrium time is about 90 min, and the model of pseudo-second order could very well describe adsorption kinetics. The modulation of adsorption isotherms showed that retention follows the Langmuir model. The thermodynamic study has shown that the adsorption is endothermic (ΔH° > 0) and spontaneous (ΔG° < 0).

scholarly journals Adsorption of Crystal Violet Dye onto Tamarind Seed Powder

2010 ◽  
Vol 7 (3) ◽  
pp. 975-984 ◽  
Author(s):  
Himanshu Patel ◽  
R. T. Vashi
Keyword(s):  
Crystal Violet ◽  
Adsorption Mechanism ◽  
Freundlich Isotherm ◽  
Tamarind Seed ◽  
Crystal Violet Dye ◽  
Adsorption Data ◽  
Equilibrium Data ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Shell Powder

The present investigation describes adsorption of crystal violet dye from its aqueous solution onto tamarind (Tamarindus indica) fruit shell powder. Initial concentration, agitation speed and pH with various temperature have been studied, in which pH was found to be most effective. The adsorption data were mathematically analyzed using adsorption isotherm like Freundlich and Langmuir isotherm to study adsorption mechanism of crystal violet onto this seed powder. Freundlich isotherm was found to be most applicable. The equilibrium data were applied to intra-particle diffusion and adsorption kinetics. The reaction was found to be pseudo second order.

scholarly journals Study of the Digestate as an Innovative and Low-Cost Adsorbent for the Removal of Dyes in Wastewater

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 852
Author(s):  
Sicong Yao ◽  
Massimiliano Fabbricino ◽  
Marco Race ◽  
Alberto Ferraro ◽  
Ludovico Pontoni ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Contact Time ◽  
Removal Rate ◽  
Low Cost ◽  
Second Order ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Diffusion Kinetic ◽  
Pseudo Second Order

Digestate, as an urban solid waste, was considered as an innovative adsorbent for colorant polluted wastewater. Batch adsorption experiments were carried out using digestate as an adsorbent material to remove various dyes belonging to different categories. The removal rate and adsorption capacity of dyes were evaluated and the dose of digestate, contact time, and initial dye concentration were studied. The maximum removal rate was approximately 96% for Methylene Blue. The equilibrium time for the Methylene Blue was 4 h, while for other dyes, a longer contact time was required to reach the equilibrium. The suspicion of colloidal matter release into the solution from solid fraction of the digestate led to the investigation of the consequence of a washing step of the digestate adsorbent upstream the adsorption experiment. Washed and not washed adsorbents were tested and the differences between them in terms of dye removal were compared. Moreover, experimental data were fitted by pseudo-first order, pseudo-second order, and intra-partial diffusion kinetic models as well as Langmuir, Freundlich, and Sips isotherm models. The results from fitted models showed that the adsorption of various dyes onto the digestate was mostly well fitted by the Langmuir isotherm and pseudo-second-order kinetic model.

scholarly journals Adsorption of crystal violet dye onto olive leaves powder: Equilibrium and kinetic studies

2021 ◽  
Author(s):  
CI Chemistry International
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Crystal Violet ◽  
Low Cost ◽  
Wave Length ◽  
Kinetic Studies ◽  
Absorption Spectrometry ◽  
Isotherm Models ◽  
Olive Leaves ◽  
Crystal Violet Dye

Adsorption of crystal violet dye from aqueous solutions applying olive leaves powder (OLP) as a biosorbent has been examined under various experimental circumstances. The influence of contact time, pH, initial concentration of studied dye and adsorbent dose on the adsorption process has been investigated applying batch experiments. The concentration of remaining dye has been determined using molecular absorption spectrometry at wave length of 580 nm. The maximum removal of studied dye has been realized at pH 7.5 with a percent removal of 99.2% after 20 min of agitation time. Langmuir, Freundlich, and Temkin isotherm models exemplify the best fit for the experimental data; while the elevated adsorption capacity was 181.1 mg.g1. Adsorption kinetics of crystal violet was expected sufficiently with the empirical pseudo-second-order model. Corresponding to the adsorption capacity, olive leaves powder thought as a low cost, effective, and environmentally friendly biosorbent for the removal of crystal violet dye from aqueous solutions.

scholarly journals Adsorption of Supranol Yellow 4GL from Aqueous Solution onto Activated Carbons Prepared from Seawater Algae

2012 ◽  
Vol 30 (1) ◽  
pp. 81-95 ◽  
Author(s):  
Fadela Nemchi ◽  
Benaouda Bestani ◽  
Nouredine Benderdouche ◽  
Mostefa Belhakem ◽  
Louis Charles de Minorval
Keyword(s):  
Activated Carbons ◽  
Low Cost ◽  
Chemical Activation ◽  
Batch Adsorption ◽  
Order Model ◽  
Rate Determining Step ◽  
Adsorption Capacities ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Ft Ir

Adsorbents prepared from seawater algae, viz. green Ulva lactuca (PGA) and brown Systoceira stricta (PBA), by chemical activation were successfully tested for the removal of Supranol Yellow 4GL dye from aqueous solutions. Impregnation in 20% phosphoric acid for 2 h at 170 °C and subsequent air activation at 600 °C for 3 h significantly enhanced the adsorption capacities of both algae relative to their inactivated states. Parameters influencing the adsorption capacity such as contact time, adsorbent dosage, pH and temperature were studied. Similar experiments were carried out with commercially available Merck activated carbon (MAC) for comparative purposes. Adsorption efficiencies were measured at a pH 2 and dosages of 8 g/ℓ and 12 g/ℓ for PGA and PBA, respectively. Batch adsorption experiments resulted in maximum adsorption capacities determined from Langmuir models of up to 263, 93 and 84 mg/g for PGA, PBA and MAC, respectively. BET, FT-IR analyses, iodine number and Methylene Blue index determination were also performed to characterize the prepared adsorbents. The adsorption kinetics were found to comply with the pseudo-second-order model with intra-particle diffusion being the rate-determining step. Thermodynamic analysis confirmed that the adsorption reaction was spontaneous and endothermic. These studies indicate that these seawater algae could be used as low-cost alternatives for the removal of dyes.

scholarly journals Adsorptive removal of pentachlorophenol from aqueous solutions using powdered eggshell

2017 ◽  
Vol 43 (3) ◽  
pp. 10-16 ◽  
Author(s):  
Krzysztof Kuśmierek ◽  
Paulina Idźkiewicz ◽  
Andrzej Świątkowski ◽  
Lidia Dąbek
Keyword(s):  
Aqueous Solutions ◽  
Low Cost ◽  
Second Order ◽  
Isotherm Models ◽  
Order Model ◽  
Diffusion Kinetic ◽  
Monolayer Adsorption ◽  
Equilibrium Data ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

AbstractThe usefulness of untreated powdered eggshell as low-cost adsorbent for the removal of pentachlorophenol (PCP) from aqueous solutions was investigated. The most important parameters affecting the adsorption process, including the pH and ionic strength, were examined. The adsorption characteristics of PCP onto eggshell were evaluated in terms of kinetic and equilibrium parameters. The kinetic data were studied in terms of the pseudo-first order, pseudo-second order and intra-particle diffusion kinetic models. The equilibrium data were analyzed using the Langmuir, Freundlich, Sips and Redlich-Peterson isotherm models. The pseudo-second order model best described the adsorption kinetics. Using the Langmuir equation, the monolayer adsorption capacity of eggshell for PCP was found to be 0.127 mg/g. The results showed that PCP can be effectively removed from aqueous solution employing eggshell as a cheap adsorbent.

scholarly journals Kinetics and adsorption studies of lead (II) onto activated carbon using low cost adsorbents

2018 ◽  
Vol 20 (2) ◽  
pp. 381-388 ◽  
Keyword(s):  
Low Cost ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Rate Limiting Step ◽  
Bambusa Vulgaris ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Fagopyrum Esculentum Moench

The removal of Lead (II) from aqueous solutions using Fagopyrum esculentum Moench (Buckwheat) and Bambusa vulgaris (common bamboo) as adsorbents was investigated. The effects of various experimental parameters such as initial concentration, contact time and pH have been studied using batch adsorption technique. All the Adsorption isotherm models fitted well with the adsorption data. However, Freundlich isotherm displayed a better fitting model than the other two isotherm models due to high correlation coefficient (R2). This indicates the applicability of multilayer coverage of the Pb (II) on the surface of adsorbent. The adsorption kinetics was studied using four simplified models and it was found to follow the pseudo-second-order kinetic model which confirmed the applicability of the model. The adsorption mechanism was found to be chemisorption and the rate-limiting step was mainly surface adsorption.

scholarly journals SYNTHESIS OF NANOSILICA FROM RICE HUSK AND OPTIMIZATION OF THE REMOVAL OF CRYSTAL VIOLET DYE FROM AQUEOUS SOLUTION

2018 ◽  
Vol 56 (1A) ◽  
pp. 189
Author(s):  
Nguyen Van Hung
Keyword(s):  
Crystal Violet ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Absorption Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Crystal Violet Dye ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Temperature And Pressure

Nanosilica was synthesized via the hydrothermal technique, followed by the vacuum frying system at low temperature and pressure. Then, the achieved nanoparticles were used for removing of Crystal Violet dye (CV) from wastewater. The absorbent and absorption process were studied by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FE-SEM), X-ray Fluorescence (XRF). Batch adsorption experiments were conducted under different conditions including contact time, initial concentration of dye and adsorbent dose. The kinetic study of CV dye on the nanoparticles can be well depicted theoretically by using pseudo-second-order kinetic model.

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