Adsorption dynamics and rate assessment of volatile organic compounds in active carbon

In this paper, a new kind of clay copolymer adsorbent, bentonite compositing with maleic anhydride (MAH)-acrylic acid (AA)-vinyl acetate (VAc) copolymer (NaB/PMAV) was prepared by in-situ polymerization. It was used as polymer adsorbent for removing Pb (II) ions in wastewater.. Under the optimal condition of adsorption, the removal rate reached to 94.4% and the adsorption capacity got to 235.9 mg/g. Adsorption dynamics were consistent with pseudo-second-order kinetic model and isotherm model can meet the Langmuir isotherm.

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Loess Based Copolymer Composite for Removing Basic Fuchsin

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.633.165 ◽

2014 ◽

Vol 633 ◽

pp. 165-168 ◽

Cited By ~ 2

Author(s):

Li Wang ◽

Wen Juan He ◽

Yu Feng He ◽

Hong Li ◽

Rong Min Wang

Keyword(s):

Kinetic Model ◽

Optimal Condition ◽

Removal Rate ◽

Freundlich Isotherm ◽

Order Kinetic ◽

Basic Fuchsin ◽

Adsorption Dynamics ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Polymer Adsorbent

Loess based copolymer (L/CoPolym), a typical silicate minerals / copolymer composite, was used as polymer adsorbent for removing basic fuchsin (BF) in wastewater. Under the optimal condition of adsorption, the removal rate of BF reached to 98.2%, and the adsorption capacity got to 565.0 mg/g. Adsorption dynamics were consistent with pseudo-second-order kinetic model and isotherm model can meet the Freundlich isotherm.

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Dyeing mechanism and photodegradation kinetics of gardenia yellow natural colorant

Textile Research Journal ◽

10.1177/0040517520958483 ◽

2020 ◽

pp. 004051752095848

Author(s):

Huiyu Jiang ◽

Xiaodong Hu ◽

Asfandyar Khan ◽

Jinbo Yao ◽

Muhammad Tahir Hussain

Keyword(s):

Kinetic Model ◽

Cotton Fabric ◽

Reaction Rate Constant ◽

Second Order ◽

Order Kinetic ◽

Natural Colorant ◽

Yellow Solution ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Dyeing Rate

In this study, gardenia yellow solution is used to dye 100% cotton fabric. The dyeing rate curve and adsorption isotherms were recorded to explore the thermodynamic model and to calculate the corresponding parameters. A definite concentration of gardenia yellow solution was placed under the xenon arc lamp for irradiation to test its photodegradability. Absorbance of the solution was measured at different degradation times and the corresponding varying curve of the absorbance was drawn to explore the photodegradation reaction order of the natural colorant and consistent parameters were calculated. The experimental results proved that the dyeing of cotton fabric with gardenia yellow colorant followed the pseudo second order kinetic model whereas adsorption isotherm followed the Langmuir model and the photodegradation process followed the second order kinetic model. Values of different parameters were calculated: reaction rate constant k = 2.26 × 10–3 (mg · L−1)1−m h−1, the correlation coefficient R2 = 0.994, and half decay time t1/2 = 5.82 h.

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Second-Order Kinetic Model for the Sorption of Cu(II) Ions in Aqueous Solutions of Zeolite NaA

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.560-561.1174 ◽

2012 ◽

Vol 560-561 ◽

pp. 1174-1177 ◽

Cited By ~ 2

Author(s):

Dimitar Petrov Georgiev ◽

Bogdan Iliev Bogdanov ◽

Yancho Hristov ◽

Irena Markovska

Keyword(s):

Kinetic Model ◽

Aqueous Solutions ◽

Kinetic Parameters ◽

Linear Equations ◽

Linear Method ◽

Second Order ◽

Order Kinetic ◽

Zeolite Naa ◽

Order Kinetic Model ◽

Pseudo Second Order

In this study, the sorption of Cu(II) ions in aqueous solutions of Zeolite NaA by performing batch kinetic sorption experiments. The equilibrium kinetic data were analyzed using the pseudo-second-order kinetic model. A comparison was made of the linear least-squares method and nonlinear method of the widely used pseudo-second-order kinetic model for the sorption of Cu(II) ions of Zeolite . Four pseudo-second-order kinetic linear equations are discussed. Kinetic parameters obtained from the four kinetic linear equations using the linear method differed but they were the same when using the non-linear method. Kinetic parameters obtained from four kinetic linear equations using the linear method differed. Equation type 1 pseudo-second-order kinetic model very well represented the kinetic of the adsorption Cu(II) ions by Zeolite NaA. Equation type 4 exhibited the worst fit. Present investigation showed that the non-linear method may be a better way to determine the kinetic parameters.

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Equilibrium and Kinetic Studies of Benzene and Toluene Adsorption onto Microwave Irradiated-Coconut Shell Activated Carbon

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1043.219 ◽

2014 ◽

Vol 1043 ◽

pp. 219-223 ◽

Cited By ~ 1

Author(s):

Noor Shawal Nasri ◽

Jibril Mohammed ◽

Muhammad Abbas Ahmad Zaini ◽

Usman Dadum Hamza ◽

Husna Mohd. Zain ◽

...

Keyword(s):

Activated Carbon ◽

Kinetic Studies ◽

Coconut Shell ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Volatile Organic ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order ◽

Coconut Shell Activated Carbon

Concern about environmental protection has increased over the years and the presence of volatile organic compounds (VOCs) in water poses a threat to the environment. In this study, coconut shell activated carbon (PHAC) was produced by potassium hydroxide activation via microwave for benzene and toluene removal. Equilibrium data were fitted to Langmuir, Freundlich and Tempkin isotherms with all the models having R2 > 0.94. The equilibrium data were best fitted by Langmuir isotherm, with maximum adsorption capacity of 212 and 238mg/g for benzene and toluene, respectively. The equilibrium parameter (RL) falls between 0 and 1 confirming the favourability of the Langmuir model. Pseudo-second-order kinetic model best fitted the kinetic data. The PHAC produced can be used to remediate water polluted by VOCs.

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Comparison of Adsorptive Removal of Total Nitrogen (T-N) and Total Phosphorous (T-P) in Aqueous Solution using Granular Activated Charcoal (GAC)

JOURNAL OF ADVANCES IN CHEMISTRY ◽

10.24297/jac.v9i1.2306 ◽

2013 ◽

Vol 9 (1) ◽

pp. 1822-1836

Author(s):

Keon Sang Ryoo ◽

Jong-Ha Choi ◽

Yong Pyo Hong

Keyword(s):

Aqueous Solution ◽

Kinetic Model ◽

Adsorption Capacity ◽

Total Nitrogen ◽

Activated Charcoal ◽

Adsorption Equilibrium ◽

Order Kinetic ◽

Total Phosphorous ◽

Order Kinetic Model ◽

Pseudo Second Order

The present study is to explore the possibility of utilizing granular activated charcoal (GAC) for the removal of total phosphorous (T-P) and total nitrogen (T-N) in aqueous solution. Batch adsorption studies were carried out to determine the influences of various factors like initial concentration, contact time and temperature. The adsorption data showed that GAC has a similar adsorption capacity for both T-N and T-P. The adsorption degree of T-N and T-P on GAC was highly concentration dependent. It was found that the adsorption capacity of GAC is quite favorable at a low concentration. At concentrations of 1.0 mg L-1 of T-P and 2.0 mg L-1 of T-N, approximately 97 % of adsorption was achieved by GAC. The equilibrium data were fitted well to the Langmuir isotherm model. The pseudo-second-order kinetic model appeared to be the better-fitting model because it has higher R2 compared with the pseudo-first-order and intra-particle kinetic model. The theoretical adsorption equilibrium qe,cal from pseudo-second-order kinetic model were relatively similar to the experimental adsorption equilibrium qe,exp. To evaluate the effect of thermodynamic parameters at different temperatures, the change in free energy ΔG, the enthalpy ΔH and the entropy ΔS were estimated. Except for adsorption of T-P at 278 K, the ΔG values obtained were all negative at the investigated temperatures. It indicates that the present adsorption system occurs spontaneously. The adsorption process of T-N by GAC was exothermic in nature, whereas T-P showed endothermic behavior. In addition, the positive values of ΔS imply that there was the increase in the randomness of adsorption of T-N and T-P at GAC-solution interface.

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Adsorptive Studies for the Removal of Crystal Violet Dye from Aqueous Solution by Using Cicca Acida L. Stem - Activated Carbon

Current World Environment ◽

10.12944/cwe.16.2.10 ◽

2021 ◽

Vol 16 (2) ◽

pp. 436-443

Author(s):

Sharmila Ramasamy ◽

Anbarasu Kaliyaperumal ◽

Thamilarasu Pommanaickar

Keyword(s):

Aqueous Solution ◽

Activated Carbon ◽

Kinetic Model ◽

Crystal Violet ◽

Order Kinetic ◽

Human Beings ◽

Crystal Violet Dye ◽

Before And After ◽

Order Kinetic Model ◽

Pseudo Second Order

Textile industries discharge wastewater containing various dyes including Crystal Violet dye. These dyes are very harmful for human beings, animals and plants. Therefore, the attempt is made for adsorption framework on elimination of crystal violet dye by using Cicca acida L. stem-activated carbon from aqueous solution carried out under various experimental methods and optimization conditions. Adsorption data modeled with Freundlich, Langmuir and Tempkin adsorption isotherms. Thermodynamic factors like as âˆ†Ho, âˆ†So and âˆ†Go were calculated, which indicated that the adsorption was spontaneous and endothermic nature. Based on kinetic study, pseudo-second order kinetic model was fit compared to the pseudo-first order kinetic model. The adsorbent has been characterized by SEM before and after adsorption of crystal violet dye solution.

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Development of Cerium Oxide/Corncob Nanocomposite: A Cost-Effective and Eco-Friendly Adsorbent for the Removal of Heavy Metals

Polymers ◽

10.3390/polym13244464 ◽

2021 ◽

Vol 13 (24) ◽

pp. 4464

Author(s):

Sidra Gran ◽

Rukhsanda Aziz ◽

Muhammad Tariq Rafiq ◽

Maryam Abbasi ◽

Abdul Qayyum ◽

...

Keyword(s):

Experimental Data ◽

Kinetic Model ◽

Contact Time ◽

Cost Effective ◽

Particle Diffusion ◽

Order Kinetic ◽

Removal Of Heavy Metals ◽

Intra Particle Diffusion ◽

Order Kinetic Model ◽

Pseudo Second Order

This research aims to assess the efficiency of the synthesized corncob as a cost-effective and eco-friendly adsorbent for the removal of heavy metals. Therefore, to carry out the intended research project, initially, the corncob was doped with nanoparticles to increase its efficiency or adsorption capacity. The prepared adsorbent was evaluated for the adsorption of cadmium (Cd) and chromium (Cr) from aqueous media with the batch experiment method. Factors that affect the adsorption process are pH, initial concentration, contact time and adsorbent dose. The analysis of Cd and Cr was performed by using atomic absorption spectrometry (AAS), while the characterization of the adsorbent was performed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The results showed that there is a significant difference before and after corncob activation and doping with CeO2 nanoparticles. The maximum removal for both Cd and Cr was at a basic pH with a contact time of 60 min at 120 rpm, which is 95% for Cd and 88% for Cr, respectively. To analyze the experimental data, a pseudo-first-order kinetic model, pseudo-second-order kinetic model, and intra-particle diffusion model were used. The kinetic adsorption studies confirmed that the experimental data were best fitted with the pseudo-second-order kinetic model (R2 = 0.989) and intra-particle diffusion model (R2 = 0.979). This work demonstrates that the cerium oxide/corncob nanocomposite is an inexpensive and environmentally friendly adsorbent for the removal of Cd and Cr from wastewater.

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Removal of COD from Groundwater in and Around Industrial Areas - Using Activated Carbon Powder Prepared by Groundnut Foliage and Groundnut Husk

Oriental Journal Of Chemistry ◽

10.13005/ojc/370421 ◽

2021 ◽

Vol 37 (4) ◽

pp. 922-927

Author(s):

A. Kistan ◽

V. Kanchana ◽

N. K. Geetha ◽

G. Infant Sujitha

Keyword(s):

Activated Carbon ◽

Kinetic Model ◽

Adsorption Process ◽

Oxygen Demand ◽

Carbon Powder ◽

Order Kinetic ◽

Industrial Areas ◽

Sem Image ◽

Order Kinetic Model ◽

Pseudo Second Order

The following study explains that the adsorption efficiency of activated carbon used by Groundnut foliage and groundnut husk for the deportation of COD (Chemical Oxygen demand) from groundwater collected from in and around industrial areas of Vellore district was investigated with different activating conditions (Activating agent- KOH, ZnCl2 and H3PO4; Impregnation ratio-1:1,1:2,1:2; and activation temeperture-500-700°C. The activated carbon prepared based on optimized condition has well-developed pore structure and functional groups which is confirmed from SEM image and FTIR analysis respectively. The adsorption equilibrium was reached in 240 min with the isotherm data fitted well in both the model such as Langmuir model and Freundlich’s model indicating chemisorption’s adsorption for the activated carbon. Moreover, the adsorption process was exothermic accompanied by a decrease in irregularity. Furthermore, the adsorption kinetic study indicated that the adsorption process of the prepared sample follows the pseudo-second-order kinetic model compare to the pseudo-first -order kinetic model

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Preparation and Characterization of Magadiite–Magnetite Nanocomposite with Its Sorption Performance Analyses on Removal of Methylene Blue from Aqueous Solutions

Polymers ◽

10.3390/polym11040607 ◽

2019 ◽

Vol 11 (4) ◽

pp. 607 ◽

Cited By ~ 10

Author(s):

Mingliang Ge ◽

Zhuangzhuang Xi ◽

Caiping Zhu ◽

Guodong Liang ◽

Guoqing Hu ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Isotherm ◽

Kinetic Model ◽

Aqueous Solutions ◽

Langmuir Adsorption Isotherm ◽

Order Kinetic ◽

Langmuir Adsorption ◽

Adsorption Performance ◽

Order Kinetic Model ◽

Pseudo Second Order

The magadiite–magnetite (MAG–Fe3O4) nanocomposite has great potential applications in the field of biomaterials research. It has been used as a novel magnetic sorbent, prepared by co-precipitation method. It has the dual advantage of having the magnetism of Fe3O4 and the high adsorption capacity of pure magadiite (MAG). MAG–Fe3O4 was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). The results showed that Fe3O4 nanoparticles were deposited on the interlayer and surface of magadiite. MAG–Fe3O4 was treated as an adsorbent for methylene blue (MB) removal from aqueous solutions. The adsorption properties of MAG–Fe3O4 were investigated on methylene blue; however, the results showed that the adsorption performance of MAG–Fe3O4 improved remarkably compared with MA and Fe3O4. The adsorption capacity of MAG–Fe3O4 and the removal ratio of methylene blue were 93.7 mg/g and 96.2%, respectively (at 25 °C for 60 min, pH = 7, methylene blue solution of 100 mg/L, and the adsorbent dosage 1 g/L). In this research, the adsorption experimental data were fitted and well described using a pseudo-second-order kinetic model and a Langmuir adsorption isotherm model. The research results further showed that the adsorption performance of MAG–Fe3O4 was better than that of MAG and Fe3O4. Moreover, the adsorption behavior of MB on MAG–Fe3O4 was investigated to fit well in the pseudo-second-order kinetic model with the adsorption kinetics. The authors also concluded that the isothermal adsorption was followed by the Langmuir adsorption isotherm model; however, it was found that the adsorption of the MAG–Fe3O4 nanocomposite was a monolayer adsorption.

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