Contact time optimization of two-stage batch adsorber design using second-order kinetic model for the adsorption of phosphate onto alunite

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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Iron Chelation by Polyamidoamine Dendrimers: A Second-Order Kinetic Model for Metal–Amine Complexation

The Journal of Physical Chemistry B ◽

10.1021/jp208546a ◽

2011 ◽

Vol 115 (46) ◽

pp. 13534-13540 ◽

Cited By ~ 38

Author(s):

Michael R. Mankbadi ◽

Mohamed A. Barakat ◽

Mohamed H. Ramadan ◽

H. Lee Woodcock ◽

John N. Kuhn

Keyword(s):

Kinetic Model ◽

Iron Chelation ◽

Second Order ◽

Order Kinetic ◽

Polyamidoamine Dendrimers ◽

Order Kinetic Model ◽

Metal Amine

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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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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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KINETICS AND ISOTHERM STUDIES OF Pb(II) IMPRINTED CARBOXYMETHYL CHITOSAN–PECTIN-PEGDE

Jurnal Teknologi ◽

10.11113/jt.v79.10718 ◽

2017 ◽

Vol 79 (6) ◽

Cited By ~ 1

Author(s):

Budi Hastuti ◽

Dwi Siswanta ◽

Mudasir Mudasir ◽

Triyono Triyono

Keyword(s):

Adsorption Isotherm ◽

Kinetic Model ◽

Metal Ion ◽

Diglycidyl Ether ◽

Carboxymethyl Chitosan ◽

Second Order ◽

Order Kinetic ◽

Freundlich Adsorption Isotherm ◽

Order Kinetic Model ◽

Chelation Reaction

Pectin and chitosan are biomaterials that capable to act as biosorbent. Pectin has active groups, such as carboxyl, methoxyl, and hydroxyl (OH), while chitosan has amine group (–NH2) and hydroxyl (OH) as the active site metal ion absorber. Integration of two biopolymers is conducted by using a suitable cross-linker agents that are expected to form stable and more organized structure. This structure facilitate metal ions to enter and to form chelation reaction. Thus, it has great capacity for metal adsorption. A modified natural adsorbent pectin-chitosan has been synthesized by reacting of -OH group among pectin (Pec) and chitosan with Poly(ethylene glycol) Diglycidyl Ether (PEGDE) crosslinker agent to form a stable and an acidic medium-resistance adsorbent. Prior to increasing the active group of the adsorbent, chitosan was attached with acetate to form Carboxymethyl Chitosan (CMC). Furthermore, the CMC-Pec-PEGDE adsorbent was imprinted with Pb (II) to afford Pb(II) imprinted-CMC-Pec-PEGDE adsorbent in order to improve the selective sorption of Pb(II) metal ion. All of the functional groups attached on the synthesized adsorbents were characterized by Fourier Transform Infrared (FT-IR) Spectrometry. The kinetics and thermodynamics bath sorption of Pb(II) on Pb(II) imprinted-CMC-Pec-PEGDE film adsorbent have been investigated including the optimal condition for adsorption. The pseudo first-order and second-order kinetic model were investigated in order to determine the adsorption mechanism. The results indicated that all of the three adsorbent, CMC, CMC-Pec-PEGDE, and Pb(II) imprinted-CMC-Pec-PEGDE followed a pseudo-second-order kinetic model. Furthermore, adsorption studies of Pb(II) ion on CMC and CMC–Pec-PEGDE found to follow Langmuir adsorption while on imprinted-CMC-Pec-PEGDE followed Freundlich adsorption isotherm. The adsorption isotherm parameters of CMC and CMC-Pec-PEGDE adsorbents were ΔG° of 24.8 and 23.1 kJ mol-1, respectively. While Pb(II) imprinted-CMC-Pec-PEGDE followedisotherm model with ΔG° of 9.6 kJ mol-1.

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Uranium (VI) Recovery from Black Shale Leaching Solutions Using Ion Exchange: Kinetics and Equilibrium Studies

Minerals ◽

10.3390/min10080689 ◽

2020 ◽

Vol 10 (8) ◽

pp. 689

Author(s):

Omirserik Baigenzhenov ◽

Alibek Khabiyev ◽

Brajendra Mishra ◽

M. Deniz Turan ◽

Merey Akbarov ◽

...

Keyword(s):

Kinetic Model ◽

Sorption Isotherm ◽

Room Temperature ◽

Sorption Kinetics ◽

Second Order ◽

Order Kinetic ◽

Strong Base ◽

Maximum Sorption Capacity ◽

Order Kinetic Model ◽

Pseudo Second Order

This work studies the removal of uranium ions from chemically leached solutions by sorption using two weak and two strong base anionites. Batch sorption experiments were performed to evaluate the optimum conditions at pH 1.2–2.2, 1.0 g resin dose for 1–12 h contact time at room temperature. These experiments addressed sorption kinetics and sorption isotherm. The maximum sorption capacity reached 55.8 mg/g at room temperature. The kinetics data are well described by the pseudo-second-order kinetic model at initial uranium concentration of 0.62 mg·L−1. To describe sorption kinetics pseudo-first-order, pseudo-second-order and intraparticle diffusion models were proposed. Studies indicated that the sorption of uranium can be fitted by a pseudo-second-order kinetic model very well. Equilibria were described by Langmuir, Freundlich, and Dubinin–Radushkevich equations. The experimental sorption isotherm is successfully described by the Langmuir model.

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