scholarly journals The Olive Core, a Promoter Material for the Adsorption of Dyes: Effects on Certain Parameters, Kinetic and Thermodynamic Study

2018 ◽  
Vol 34 (6) ◽  
pp. 2859-2866
Author(s):  
Ahde El-Imache ◽  
Kamar Ouazzani
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Isotherm Models ◽  
Synthetic Dyes ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Natural Support ◽  
Kinetic And Thermodynamic Study ◽  
Adsorbent Characterization

In this study, the Moroccan Olive Core (OC) was chosen for the preparation of a bio-adsorbent for the purpose of using it as a natural support to remove two synthetic dyes: Methyl Blue (MB) and Crystal Violet (CV) from aqueous solutions. Tow adsorbent characterization techniques were used: Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Influence of some parameters is studied to characterize the adsorption process: contact time (0-45 min), temperature (25 -100 °C) and initial concentration of MB and CV (10-30 mg.l-1). Langmuir, Freundlich and Dubinin-Radushkevich isotherm models were used to describe the adsorption equilibrium. The equilibrium is perfectly described by the Freundlich model whose correlation coefficient is equal to 0.995 for MB and 0.991 for CV. Thermodynamic parameters were valued, and they showed that, for both dyes, the adsorption on MOC is endothermic and spontaneous.

scholarly journals Elimination of Methylene Blue by low-cost Biomaterial prepared from Local Natural Residue

2020 ◽  
Vol 2 (01) ◽  
pp. 60-66
Author(s):  
Fatma LANSARI ◽  
Meryem EDJEKOUANE ◽  
Omar KHELIFI ◽  
Ishak BOUKHETECHE ◽  
Ishak LAKSACI
Keyword(s):  
Methylene Blue ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Freundlich Model ◽  
Batch System ◽  
Natural Support ◽  
Uv Visible

This study aims to assess the use of natural waste (fruit kernels) for the preparation of a bimaterial in order to use it as a natural support for the elimination of a dye (methylene blue) from aqueous solutions for environmental protection. The biomaterial was characterized physicochemically and the determination of methylene blue concentration was carried out by a UV-Visible spectrophotometer. In order to clarify the adsorption process, experiments in a batch system were carried out to study the effect of operating parameters such as the initial concentration of methylene blue (2-10 mg·L-1), biomaterial (0.1-1 g) and the contact time (10-120 min). To describe the adsorption equilibrium, the experimental data were analyzed by the Langmuir isotherm and the Freundlich isotherm. The equilibrium is perfectly described by the Freundlich model (R2>0.99) and the adsorption process is multilayer. The results of the present study suggest that washingtonia seed (WS) can be advantageously used as a low-cost biosorbent for water discoloration

scholarly journals Application ofGlycyrrhiza glabraRoot as a Novel Adsorbent in the Removal of Toluene Vapors: Equilibrium, Kinetic, and Thermodynamic Study

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Fazel Mohammadi-Moghadam ◽  
Mohammad Mehdi Amin ◽  
Mehdi Khiadani (Hajian) ◽  
Fariborz Momenbeik ◽  
Heshmatollah Nourmoradi ◽  
...  
Keyword(s):  
Contact Time ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Adsorbate Concentration ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Kinetic And Thermodynamic Study ◽  
Better Than

The aim of this paper is to investigate the removal of toluene from gaseous solution throughGlycyrrhiza glabraroot (GGR) as a waste material. The batch adsorption experiments were conducted at various conditions including contact time, adsorbate concentration, humidity, and temperature. The adsorption capacity was increased by raising the sorbent humidity up to 50 percent. The adsorption of toluene was also increased over contact time by 12 h when the sorbent was saturated. The pseudo-second-order kinetic model and Freundlich model fitted the adsorption data better than other kinetic and isotherm models, respectively. The Dubinin-Radushkevich (D-R) isotherm also showed that the sorption by GGR was physical in nature. The results of the thermodynamic analysis illustrated that the adsorption process is exothermic. GGR as a novel adsorbent has not previously been used for the adsorption of pollutants.

scholarly journals A study of adsorption isotherms for the removal of herbicide Atlantis WG from aqueous solutions by using Bentonite clay

2015 ◽  
Vol 12 (1) ◽  
pp. 148-156
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Process ◽  
Equilibrium Concentration ◽  
Bentonite Clay ◽  
Langmuir Model ◽  
Effect Of Temperature ◽  
Isotherm Models ◽  
Sorption Data ◽  
Freundlich Model ◽  
The Subject

The subject of this research involves studying adsorption to removal herbicide Atlantis WG from aqueous solutions by bentonite clay. The equilibrium concentration have been determined spectra photometry by using UV-Vis spectrophotometer. The experimental equilibrium sorption data were analyzed by two widely, Langmuir and Freundlish isotherm models. The Langmuir model gave a better fit than Freundlich model The adsorption amount of (Atlantis WG) increased when the temperature and pH decreased. The thermodynamic parameters like ?G, ?H, and ?S have been calculated from the effect of temperature on adsorption process, is exothermic. The kinetic of adsorption process was studied depending on Lagergren ,Morris ? Weber and Rauschenberg equations.

scholarly journals Modified/Unmodified Nanoparticle Adsorbents of Cellulose Origin With High Adsorptive Potential for Removal of Pb(II) From Aqueous Solution

2017 ◽  
Vol 13 (27) ◽  
pp. 425
Author(s):  
Azeh Yakubu ◽  
Gabriel Ademola Olatunji ◽  
Folahan Amoo Adekola
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Solution Temperature ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Kinetics Of

This investigation was conducted to evaluate the adsorption capacity of nanoparticles of cellulose origin. Nanoparticles were synthesized by acid hydrolysis of microcrystalline cellulose/cellulose acetate using 64% H3PO4 and characterized using FTIR, XRD, TGA-DTGA, BET and SEM analysis. Adsorption kinetics of Pb (II) ions in aqueous solution was investigated and the effect of initial concentration, pH, time, adsorbent dosage and solution temperature. The results showed that adsorption increased with increasing concentration with removal efficiencies of 60% and 92.99% for Azeh2 and Azeh10 respectively for initial lead concentration of 3 mg/g. The effects of contact time showed that adsorption maximum was attained within 24h of contact time. The maximum adsorption capacity and removal efficiency were achieved at pH6. Small dose of adsorbent had better performance. The kinetics of adsorption was best described by the pseudo-second-Order model while the adsorption mechanism was chemisorption and pore diffusion based on intra-particle diffusion model. The isotherm model was Freundlich. Though, all tested isotherm models relatively showed good correlation coefficients ranging from 0.969-1.000. The adsorption process was exothermic for Azeh-TDI, with a negative value of -12.812 X 103 KJ/mol. This indicates that the adsorption process for Pb by Azeh-TDI was spontaneous. Adsorption by Azeh2 was endothermic in nature.

Pseudo-Second-Order Kinetics for the Adsorption of Uranyl Ion onto Peat at Different pH Value

2010 ◽  
Vol 113-116 ◽  
pp. 33-36
Author(s):  
Zhi Rong Liu ◽  
Qin Qin Tao ◽  
Chuan Xi Wen
Keyword(s):  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Second Order ◽  
Uranyl Ions ◽  
Batch Tests ◽  
Effects Of Ph ◽  
Pseudo Second Order

Batch tests were used to investigate the effects of pH and contact time on the adsorption capability of peat. The results indicate that adsorption of uranyl ions on peat increase with increasing pH from 1 to 5. However it takes longer contact time to reach the adsorption equilibrium with increase of pH from 1 to 5. The adsorption process can be described by type 1 of the pseudo-second-order kinetics excellently.

scholarly journals Phenol removal from aqueous solution using silica and activated carbon derived from rice husk

2019 ◽  
Vol 14 (4) ◽  
pp. 897-907 ◽  
Author(s):  
Hosseinali Asgharnia ◽  
Hamidreza Nasehinia ◽  
Roohollah Rostami ◽  
Marziah Rahmani ◽  
Seyed Mahmoud Mehdinia
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Water Treatment ◽  
Organic Pollutants ◽  
Rice Husk ◽  
Contact Time ◽  
Adsorption Process ◽  
Phenol Removal ◽  
Initial Concentration ◽  
Maximum Removal

Abstract Phenol and its derivatives are organic pollutants with dangerous effects, such as poisoning, carcinogenicity, mutagenicity, and teratogenicity in humans and other organisms. In this study, the removal of phenol from aqueous solution by adsorption on silica and activated carbon of rice husk was investigated. In this regard, the effects of initial concentration of phenol, pH, dosage of the adsorbents, and contact time on the adsorption of phenol were investigated. The results showed that the maximum removal of phenol by rice husk silica (RHS) and rice husk activated carbon (RHAC) in the initial concentration of 1 mgL−1 phenol, 2 gL−1 adsorbent mass, 120 min contact time, and pH 5 (RHS) or pH 6 (RHAC) were obtained up to 91% and 97.88%, respectively. A significant correlation was also detected between increasing contact times and phenol removal for both adsorbents (p < 0.01). The adsorption process for both of the adsorbents was also more compatible with the Langmuir isotherm. The results of this study showed that RHS and RHAC can be considered as natural and inexpensive adsorbents for water treatment.

Biosorption of Ni (II) from Aqueous Solution by Aspergillus niger

2014 ◽  
Vol 556-562 ◽  
pp. 282-285
Author(s):  
Li Fang Zhang ◽  
Zhao Shao ◽  
Chun Yang Jiang
Keyword(s):  
Contact Time ◽  
Metal Uptake ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Freundlich Model ◽  
Optimum Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Increasing Temperature ◽  
Biosorption Equilibrium

In this study, Biosorption of Ni (II) ions from aqueous solution by using biomass ofAspergillusnigerwas investigated. Different parameters such as initial pH, Ni (II) ions concentration, contact time and temperature were explored. The biosorption of Ni (II) ions was highly pH dependent and the optimum pH for biosorption of Ni (II) ions was found to be 7.0. The biosorption equilibrium was established in about 30min of contact time. Ni (II) ions removal increased with increasing temperature in the studied range. Equilibrium uptake of Ni (II) ions onto biomass increased with increasing initial Ni (II) ions concentration (20-300mg/L). The Langmuir and Freundlich isotherm models were applied to experimental equilibrium data and the Langmuir model better described the equilibrium metal uptake than the Freundlich model. These results suggest that the biomass ofAspergillusnigeris a promising biosorbent for removal of nickel (II) ions from the wastewater.

scholarly journals Adsorption of Nickel and Chromium From Aqueous Solutions Using Copper Oxide Nanoparticles: Adsorption Isotherms, Kinetic Modeling, and Thermodynamic Studies

2019 ◽  
Vol 6 (2) ◽  
pp. 66-74 ◽  
Author(s):  
Raziyeh Hosseini ◽  
Mohammad Hossein Sayadi ◽  
Hossein Shekari
Keyword(s):  
Aqueous Solutions ◽  
Copper Oxide ◽  
Removal Efficiency ◽  
Contact Time ◽  
Removal Rate ◽  
Copper Oxide Nanoparticles ◽  
Isotherm Models ◽  
Oxide Nanoparticles ◽  
Initial Concentration ◽  
Adsorbent Dosage

The research was conducted with an aim to assess the efficiency of copper oxide nanoparticles as an adsorbent to remove Ni and Cr. The effect of pH, adsorbent dosage, contact time, initial concentration of metals (Ni and Cr) on the adsorption rate was evaluated and removal of these elements from aqueous solutions was measured using Atomic Absorption Spectrum System (Conter AA700). Moreover, the kinetic and isotherm besides thermodynamic adsorption models were assessed. The highest Ni and Cr removal rate occurred at an optimal pH of 7, and an initial concentration of 30 mg/L, a time period of 30 minutes, and 1 g/L of copper oxide nanoparticles. In fact, with the increase of adsorbent dosage and contact time, the removal efficiency increased and with initial concentration increase of Ni and Cr ions, the removal efficiency reduced. The correlation coefficient of isotherm models viz. Langmuir, Freundlich, Temkin, Redlich-Peterson, and Koble-Corrigan showed that Ni and Cr adsorption via copper oxide nanoparticles better follows the Langmuir model in relation to other models. The results showed that kinetic adsorption of Ni and Cr via copper oxide nanoparticles follows the second order pseudo model with correlation coefficients above 0.99. In addition, the achieved thermodynamic constants revealed that the adsorption process of metals (i.e., Ni and Cr) via copper oxide nanoparticles was endothermic and spontaneous and the reaction enthalpy values for these metals were 17.727 and 11.862 kJ/mol, respectively. In conclusion, copper oxide nanoparticles can be used as effective and environmentally compatible adsorbents to remove Ni and Cr ions from the aqueous solutions

scholarly journals Response surface methodology for optimization of Cd(II) adsorption from wastewaters by fabricated tartaric acid-maize tassel magnetic hybrid sorbent

2019 ◽  
Vol 9 (4) ◽  
pp. 3996-4005 ◽  
Keyword(s):  
Tartaric Acid ◽  
Contact Time ◽  
Adsorption Process ◽  
Desirability Function ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Biomass Waste ◽  
Hybrid Sorbent ◽  
Maize Tassel

Maize tassels (MT), an agro-based biomass waste was carbonised followed by thermo-chemical modification using tartaric acid. The functionalized activated carbon was further modified to yield a magnetic hybrid composite adsorbent. The adsorbent was characterized using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The adsorbent was evaluated for its efficiency to remove Cd(II) ions from aqueous solutions through batch adsorption studies following a Central Composite Design. Effects of solution pH, contact time, adsorbent dosage, initial metal concentration and temperature on Cd(II) adsorption were investigated. Optimization of the adsorption process was done using desirability function on the Design Expert V11 software. The desirability function showed that the optimum parameters were pH 5.29, contact time (67.50 min), dosage (0.575 g) and initial concentration (152.50 mg/L). The adsorption process was analysed using kinetic and isotherm models. The kinetics of the adsorption process followed the pseudo-second-order model (lowest sum of square error (SSE) values and correlation coefficients (R2) > 0.999) in addition to the intraparticle diffusion model. The isotherm data were consistent with the Langmuir isotherm as evidenced by the highest correlation coefficient (R2= 0.998). The thermodynamic parameters showed that the process was endothermic and spontaneous in nature. The adsorption capacity of the adsorbent was found to be 188.68 mg/g at 20 ⁰C which is higher than that of the previously reported magnetic maize tassel hybrid (52.05 mg/g). The adsorbent showed good removal efficiency on real effluent samples.

scholarly journals USE OF ACTIVATED CHARCOAL AS BIO-ADSORBENT FOR TREAMENT OF RESIDUAL WATERS: A REVIEW

Nativa ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 215-221
Author(s):  
Lucélio Mendes Ferreira ◽  
Rafael Rodolfo de Melo
Keyword(s):  
Environmental Management ◽  
Activated Charcoal ◽  
Contact Time ◽  
Water Adsorption ◽  
Adsorption Process ◽  
Industrial Effluents ◽  
Adsorption Models ◽  
Initial Concentration ◽  
Isotherm Adsorption ◽  
Removal Of Contaminants

ABSTRACT: Adsorption is gaining attention by becoming one of the most used technologies for the removal of contaminants from water. Adsorption with activated charcoal (AC) is an efficient method for treatment of effluents; the main advantage of AC production is the use of residues that would be inappropriate discarded. The objective of this work was to gather and organize the information available about the potential of using activated charcoal as a bio-adsorbent. Researches were conducted on scientific articles about the production of activated charcoal with adsorption characteristics for the removal of contaminants from residual waters. The efficiency of this technique is dependent on different parameters that affect the adsorption process, such as: pH of the solution, dye initial concentration, contact time, adsorbent amount, and temperature. The articles studied showed that the bio-adsorbent characteristics of charcoals are promising for the removal of pollutants from residual waters. The isotherm adsorption models developed by Langmuir, Freundlich, and Brunauer, Emmett, and Teller (BET) are often used to evaluate the adsorption capacity of activated charcoals. Keywords: industrial effluents; contaminants; environmental management.   Emprego do carvão ativado como bioadsorvente para o tratamento de águas residuais: uma revisão   RESUMO: A adsorção vem ganhando destaque com uma das tecnologias mais empregadas na remoção de contaminantes em águas. No tratamento de efluentes, a adsorção com carvão ativado (CA) apresenta-se como um método eficiente. A principal vantagem da produção de CA é o aproveitamento de resíduos que seriam descartados de forma inadequada. O objetivo desta pesquisa é organizar algumas informações disponíveis com relação ao potencial do carvão ativado como bioadsorvente. Foram realizadas pesquisas em periódicos sobre produção de carvão ativado com características adsortivas na remoção de contaminantes em águas residuais. A eficácia dessa técnica sob diferentes parâmetros influencia no processo de adsorção, tais como: pH da solução, concentração inicial do corante, tempo de contato, quantidade do adsorvente e temperatura. Em todos os artigos estudados, as características dos carvões como bioadsorventes se mostraram promissores no processo para remoção de poluentes em águas residuais. Conclui-se que os modelos de isotermas de adsorção desenvolvidos por Langmuir, Freundlich e BET são frequentemente utilizados para avaliar a capacidade de adsorção dos carvões ativados. Palavras-chave: efluentes industriais; contaminantes; gestão ambiental.

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