Adsorption of Acid Red G Dye from Solutions by Raw Bentonite and Bentonite-Cationic Starch Composite

2013 ◽  
Vol 821-822 ◽  
pp. 540-544
Author(s):  
Hua Ling He ◽  
Zhi Cai Yu ◽  
Peng Liang
Keyword(s):  
Adsorption Isotherms ◽  
Low Cost ◽  
Cationic Starch ◽  
Kinetics Of Adsorption ◽  
First Order ◽  
Pseudo Second Order ◽  
Isotherm Equations ◽  
Kinetics Of ◽  
Acid Red G ◽  
Langmuir And Freundlich Models

The adsorption of acid red G dye onto raw bentonite/cationic starch (RB/CS) and raw bentonite (RB) was investigated in aqueous solution in a bath system with respect to the adsorption kinetics and adsorption isotherms, respectively. For RB and RB/CS composite, the kinetic data showed that the kinetics of adsorption was best described by a pseudo-second-order expression than the pseudo-first-order. Adsorption isotherms of acid red G dye onto RB and RB/CS composite were determined with common isotherm equations such as the Langmuir and Freundlich models. The results showed that for RB/CS composite, the Langmuir model agreed very well with the experimental data, whereas the RB was fitted to both Langmuir and Freundlich models. In summary, the results showed that RB/CS could be employed as low-cost materials for the removal of acid red G dye from effluents compared to RB.

Study on the Kinetics of Adsorption of Cadmium by Chitosan

2010 ◽  
Vol 160-162 ◽  
pp. 1804-1809
Author(s):  
Qiang Bi ◽  
Juan Qin Xue ◽  
Ying Juan Guo ◽  
Yu Jie Wang ◽  
Yun Feng Xue
Keyword(s):  
Kinetic Equations ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Kinetics Of Adsorption ◽  
Ph Values ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Simulated Wastewater ◽  
Isotherm Equations ◽  
Kinetics Of

The adsorption of cadmium in simulated wastewater by chitosan was investigated. The influence of temperature, contact time and pH on adsorption efficiency of cadmium was examined. Some related mathematical models were used in the fitting of experimental data. The results showed that at room temperature, the optimum pH of adsorption is between 4 and 7. At lower pH values, a strong competition existed between cadmium ions and protons for sorption sites and the sorption efficiency was decreased. After 60 minutes the adsorption equilibrium can be achieved. Chitosan is very effective at removing cadmium with the maximum adsorption capacity is 112.05mg•g-1. The adsorption kinetic curves agree with the pseudo-second-order adsorption kinetic equations and the adsorption isotherms could be well described by Langmuir isotherm equations.

Isotherms and kinetics of dyeing poly-m-phenyleneisophthal-amide with Basic Red 46 based on the macro-cation dyeing mechanism

2020 ◽  
pp. 004051752093405
Author(s):  
Dan Sheng ◽  
Bo Deng ◽  
Yunli Wang ◽  
Ling Liu ◽  
Xin Chen ◽  
...  
Keyword(s):  
Intraparticle Diffusion ◽  
First Order ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Pseudo Second Order ◽  
Aggregation Behaviors ◽  
Pseudo First Order ◽  
Kinetics Of ◽  
Basic Red 46 ◽  
Langmuir And Freundlich Models

The aggregation behaviors of Basic Red 46 in water, water/dimethylacetamide (water/DMAc), and water/DMAc/NaCl were investigated by both a Transmission Electron Microscope and a laser particle size analyzer. The corresponding electric conductivity of the dyeing solution and surface zeta potential of dye aggregates using different concentrations of DMAc and NaCl were compared. The kinetics and adsorption isotherms of dyeing poly- m-phenyleneisophthalamide (MPIA) based on the macro-cation dyeing mechanism were investigated. The Langmuir and Freundlich models were used to determine the adsorption type. Pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were applied to determine the kinetics of [DMAc-Dye]+ adsorption onto MPIA. The washing and rubbing fastness of dyed MPIA using different initial dye concentrations and dyeing time were measured and analyzed.

scholarly journals Biosorption of Nickel (II) from Aqueous Solutions onto Pistachio Hull Waste as a Low-Cost Biosorbent

2019 ◽  
Vol 5 (2) ◽  
pp. 447 ◽  
Author(s):  
Majid Zamani Beidokhti ◽  
Seyed Taghi (Omid) Naeeni ◽  
Mohammad Sajjad AbdiGhahroudi
Keyword(s):  
Heavy Metals ◽  
Low Cost ◽  
Agricultural Waste ◽  
Process Time ◽  
Kinetics Of Adsorption ◽  
Initial Concentration ◽  
Hull Waste ◽  
Removal Of Heavy Metals ◽  
Pseudo Second Order ◽  
Kinetics Of

There are many different industrial wastewater containing heavy metals that contribute to environmental pollution and raw agricultural waste is an effective adsorbent for the removal of heavy metals. The adsorption behavior of pistachio hull powder (PHP) as a low-cost adsorbent, with respect to nickel (II) ions, has been studied in order to consider its application to the purification of metal finishing wastewater. In this work, adsorption of nickel on pistachio hull has been studied by batch techniques. The adsorption depends on the process time, the pH of the solution, initial concentration of metals and the adsorbent concentration in the suspension. The kinetics of adsorption were relatively fast, reaching equilibrium for less than 60 minutes. Kinetic and isotherm modeling studies demonstrated that the experimental data best fit a pseudo-second order and Freundlich model, respectively. The maximum Langmuir adsorption capacity was 14 mg/g. The optimum pH required for maximum adsorption was found to be 4-6. The initial concentration of the adsorbate and the concentration of pistachio hull strongly affect the process. No influence of particle size was evidenced. A degree of adsorption higher than 75% can be achieved for nickel (II) ions.

scholarly journals Kinetics and thermodynamics of adsorption of congo red on cellulose

2010 ◽  
Vol 8 (4) ◽  
pp. 906-912 ◽  
Author(s):  
Babak Samiey ◽  
Mohammad Dargahi
Keyword(s):  
Congo Red ◽  
Kinetics Of Adsorption ◽  
First Order ◽  
Rate Limiting Step ◽  
Pseudo Second Order ◽  
Initial Adsorption ◽  
Initial Adsorption Rate ◽  
Rate Limiting ◽  
Kinetics Of ◽  
Cellulose Surface

AbstractThermodynamics and kinetics of adsorption of congo red (CR) on cellulose are studied at 308–328 K. In the used concentration range of CR, interaction of CR with cellulose is exothermic and CR molecules adsorb chemically on cellulose surface. The effects of contact time, temperature and initial concentration of CR on kinetics of its adsorption on cellulose were investigated. The process proceeds according to the pseudo-second-order equation. Initial adsorption rate of adsorption is first-order in CR and the intraparticle diffusion of CR molecules within cellulose is identified as the main rate-limiting step.

Elimination of arsenic (III) by adsorption on coal resulting from date pits and activated thermally and chemically

2012 ◽  
Vol 47 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Mounir Ziati ◽  
Sabir Hazourli ◽  
Sana Nouacer ◽  
Fatma Zohra Khelaifia
Keyword(s):  
Iron Oxide ◽  
Order Type ◽  
Carbonaceous Matter ◽  
Kinetics Of Adsorption ◽  
Thermally Activated ◽  
Pseudo Second Order ◽  
Influence Of Ph ◽  
Kinetics Of ◽  
Langmuir And Freundlich Models ◽  
Date Pits

The objective of this study is the valorisation of a lignocellulosic natural residue, date pits, and its application in the removal by adsorption of the arsenic (III) contained in water. The chronological stages in obtaining coal were: cleaning, drying, crushing and finally either a thermal treatment by pyrolysis at 900 °C (CAP1) or a chemical pretreatment with iron oxide of the natural residue followed by carbonisation at 600 °C (CAP2). The choice of iron oxide is based on the fact that arsenic (III) has strong affinities for the hydroxide and oxide of this metal. The characterisation of the carbonaceous matter showed properties comparable with those of many industrially produced coals. Retention tests of arsenic (III) on the two adsorption materials studied gave a maximum capacity of adsorption (at 20 °C and 24 h of contact time) of about 25 mg/g for the chemically activated carbon and 21 mg/g for the thermally activated one. The study of the influence of pH and temperature showed that at neutral pH and ambient temperature (T = 20 °C), the optimal adsorption of arsenic (III) follows quite closely the Langmuir and Freundlich models. The kinetics of adsorption is slow and is of pseudo-second order type.

Adsorption of lead (II) ions onto novel cassava starch 5-choloromethyl-8-hydroxyquinoline polymer from an aqueous medium

2016 ◽  
Vol 74 (4) ◽  
pp. 943-956 ◽  
Author(s):  
Prapti U. Shah ◽  
Nirav P. Raval ◽  
Mayur Vekariya ◽  
Poonam M. Wadhwani ◽  
Nisha K. Shah
Keyword(s):  
Aqueous Medium ◽  
Low Cost ◽  
Cassava Starch ◽  
Second Order ◽  
Intraparticle Diffusion Model ◽  
First Order ◽  
Adsorption Capacities ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models ◽  
Time Lead

Adsorption of lead (II) ions onto cassava starch 5-choloromethyl-8-hydroxyquinoline polymer (CSCMQ) was investigated with the variation in the parameters of pH, contact time, lead (II) ions concentration, temperature and the adsorbent dose. The Langmuir and Freundlich models have been applied. CSCMQ was characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. Results showed that the adsorption process was better described by the Langmuir model. Adsorption kinetics data obtained for the metal ions sorption were investigated using pseudo-first-order, pseudo-second-order and intraparticle diffusion model. The maximum adsorption capacities (qm) were 46.512, 43.859 and 42.735 mg/g at 25, 35 and 45 °C, respectively. The dynamical data fit well with the second-order kinetics model. The results indicate that CSCMQ could be employed as low-cost material for the adsorption of Pb(II) ions from aqueous medium.

scholarly journals Kinetics of Adsorption in Mercury Removal Using Cassava (Manhiot esculenta) and Lemon (Citrus limonum) Wastes Modified with Citric Acid1

2015 ◽  
Vol 19 (2) ◽  
pp. 37 ◽  
Author(s):  
Candelaria Tejada ◽  
Ángel Villabona Ortiz ◽  
Luz Ercilia Garcés Jaraba
Keyword(s):  
Negative Impact ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Industrial Effluents ◽  
Second Order ◽  
Kinetics Of Adsorption ◽  
Pseudo Second Order ◽  
Toxic Concentrations ◽  
Kinetics Of ◽  
Best Fit

The high toxic concentrations of mercury in water bodies and its negative impact on the environment has resulted in the need for research on effective and low-cost methods for the treatment of industrial effluents, such as adsorption. This research compares the feasibility and viability of the adsorption abilities of cassava and lemon citric acid-modified peels. The results showed that the modified peel of cassava has a better adsorption ability compared to that of lemon. The kinetics models that best fit the experimental data were the Pseudo-second order model and the Elovich model for both modified biomasses. This means that the mechanism that controls the adsorption is a second order reaction, and also shows that the catalytic area of the adsorbent is heterogeneous; whereas the Freundlich isotherm describes better the adsorption process. In conclusion, the use of waste material is possible for Hg (II) removal. The study of chemical modifications is suggested to improve the adsorption percentages.

Efficient adsorption of chlorpyrifos onto modified activated carbon by gamma irradiation; a plausible adsorption mechanism

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohamed S. Yahia ◽  
Ahmed S. Elzaref ◽  
Magdy B. Awad ◽  
Ahmed M. Tony ◽  
Ahmed S. Elfeky
Keyword(s):  
Gamma Irradiation ◽  
Area Measurement ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Pseudo First Order ◽  
Kinetics Of

Abstract Commercial Granulated Active Carbon (GAC) has been modified using 10 Gy dose Gamma irradiation (GAC10 Gy) for increasing its ability of air purification. Both, the raw and treated samples were applied for removing Chlorpyrifos pesticide (CPF) from ambient midair. Physicochemical properties of the two materials were characterized by Fourier Transform Infrared (FT-IR) and Raman spectroscopy. The phase formation and microstructure were monitored using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), supported with Energy-Dispersive X-ray (EDX). The Surface area measurement was detected using BET particle size prosometry. Obtained outcomes showed that, the maximum adsorption capacity, given by Langmuir equations, was greatly increased from 172.712 to 272.480 mg/g for GAC and GAC10 Gy, respectively, with high selectivity. The overall removal efficiency of GAC10 Gy was notably comparable to that of the original GAC-sorbent. The present study indicated that, gamma irradiation could be a promising technique for treating GAC and turned it more active in eliminating the pesticides pollutants from surrounding air. The data of equilibrium has been analyzed by Langmuir and Freundlich models, that were considerably better suited for the investigated materials than other models. The process kinetics of CPF adsorbed onto both tested carbon versions were found to obey the pseudo first order at all concentrations with an exception at 70 mg/l using GAC, where, the spontaneous exothermic adsorption of Chlorpyrifos is a strong function for the pseudo-first order (PFO) and pseudo second order (PSO) kinetics.

scholarly journals Study of the adsorption capacity of Fe(II) dissolved in water by using a mineral rich in Manganese Dioxide (MnO2) from Colombia

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 223-228 ◽  
Author(s):  
Jhonnathan Machado-Infante ◽  
Gustavo Ramírez-Caballero ◽  
Martha Juliana Barajas Meneses
Keyword(s):  
Aqueous Solution ◽  
Raman Spectroscopy ◽  
Water Treatment ◽  
Adsorption Capacity ◽  
Open Systems ◽  
Kinetics Of Adsorption ◽  
Equilibrium And Kinetics ◽  
Pseudo Second Order ◽  
Potential Alternative ◽  
Kinetics Of

<p>In Colombia, a mineral rich in MnO<sub>2</sub> is extracted from the mines of Mallama, Nariño. In this work we studied the adsorption capacity of this mineral for Fe(II) dissolved in aqueous solution of open systems. The characterization was done through ICP-AES, XRF and Raman spectroscopy. The effect of different pretreatments on the mineral with oxidizing agents such as KMnO<sub>4</sub> and NaClO was evaluated. Studies of equilibrium and kinetics of adsorption showed that the mechanism fits well to the Langmuir isotherm and its kinetics to a model of pseudo-second order. At the conditions studied was found that the adsorption capacity for the mineral modified with KMnO<sub>4</sub> and NaOCl were 59.209 and 51.279 mg/g respectively. It is concluded that the mineral is a potential alternative in water treatment.</p>

Sign in / Sign up

Export Citation Format

Share Document