Equilibrium and Thermodynamic Studies on the Biosorption of Lead (II) by Living and Nonliving Biomass of Penicillium notatum

Khodabakhshi, Abbas; Mohammadi‐Moghadam, Fazel; Shakeri, Kobra; Hemati, Sara

doi:10.1155/2022/3109212

Cited by 8 publications

(9 citation statements)

References 38 publications

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“…Here, q e (mg.g − 1 ) is the equilibrium adsorption capacity. C e (mg.L − 1 ) is the equilibrium concentration of the adsorbent, and K and n are the Freundlich constants obtained in the curve logqe vs. logCe [47,48]. Te results showed that the adsorption in TWMNPs follows the Langmuir model (R 2 = 0.963), and the maximum adsorption capacity of Pb (II) on to the TWMNPs at 10.67 mg.g − 1 indicated the ability of the TWMNPs for adsorption of Pb (II).…”

Section: Adsorption Isothermmentioning

confidence: 96%

“…In order to determine the absorption capacity of an adsorbent, this parameter is an important and efective factor. In order to determine the adsorption mechanism, Langmuir and Freundlich isotherms were used in this research [47,48]. Te linear equation of the Langmuir isotherm is given in equations ( 9) and (10).…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…In frst-order reactions, the removal rate depends on the initial concentration of the reactant, and the reaction rate is proportional to the initial concentration of the reactant. However, the second order reactions can be defned as chemical reactions in which the sum of powers in the corresponding rate law of the chemical reaction is equal to [47]. Te kinetic equations are shown in Table 4.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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Evaluation of Pb (II) Removal by Tea Pulp Modified with Magnetite Nanoparticle

Mozaffari

Khodabakhshi

Azizi³

2023

Journal of Chemistry

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Tea waste was used to successfully synthesize magnetic nanoparticles (TWMNPs). In this investigation, Pb (II) was eliminated by tea waste modified with magnetite nanoparticles (TWMNPs) was investigated. To prepare the TWMNPs, FeCl3.6H2O was dissolved in double distilled water (DDW) and 20 g of pulp tea was added slowly and stirred, after 30 min TWMNPs adsorbent were separated through an external magnetic field and washed three times with double distilled water (DDW) and ethanol then dried at 60°C. The FESEM test of TWMNPs shows the particle size in the range of 15–20 nm and spherical/cuboid-shaped crystal structure of Fe3O4 (magnetite). X-ray analysis showed that the main XRD diffraction peaks of TWMNPs are related to Fe3O4, HighScore plus X’Pert software was used to identify the phase in this sample. The specific surface area of the prepared magnetite nanoparticles was 25.2 m2.g−1. The pore volume, maximum pore radius, and VSM of TWMNPs were 14.4 cm3.g−1, 2.3 nm, and 3.37–2.41, respectively. The effects of various parameters, such as contact time, pH, concentration, and adsorbent dosage, were studied. The experimental isotherm data were analyzed using the Langmuir and Freundlich models, and it was found that the removal process followed the Langmuir isotherm and the maximum adsorption capacity calculated by Langmuir fitting was 10.67 mg.g−1. In addition, the adsorption kinetics followed the first-order kinetic model and the value of rate constant was found to be 14.04 × 10−2 min−1. The results showed that increasing the pH level led to a rise in the response level and Pb (II) removal. Also, the trend in Pb (II) removal and response level had an increase with increasing the initial concentration of Pb (II). Increasing contact time from 5 to 20 minutes has a slight effect on Pb (II) removal. Considering the results, TWMNPs could lead to suitable results for the removal of Pb (II) from wastewater containing this metal. And the maximum adsorption capacity was found to be 10.67 mg.g−1.

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Section: Adsorption Isothermmentioning

confidence: 96%

Section: Adsorption Isothermmentioning

confidence: 99%

Section: Adsorption Kineticsmentioning

confidence: 99%

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Evaluation of Pb (II) Removal by Tea Pulp Modified with Magnetite Nanoparticle

Mozaffari

Khodabakhshi

Azizi³

2023

Journal of Chemistry

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“…It is known that produced iron oxide is in the form of Fe 3 O 4 . Te achieved mixture was dried in an oven at 100 °C for 2 hours [22,[25][26][27].…”

Section: Synthesis Of Mwcnts-fe 3 Omentioning

confidence: 99%

“…Tis parameter is a key factor in determining the capacity of an adsorbent and optimizing the adsorbent consumption. In this study, Langmuir and Freundlich adsorption isotherms were used to investigate the adsorption mechanism [22,26,27,42]. Linear equation of the Langmuir isotherm is given in the following equation:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Removal of Natural Organic Matter (NOM) from Aqueous Solutions by Multi-Walled Carbon Nanotube Modification with Magnetic Fe3O4 Nanoparticles

Khodabakhshi

Farssani²,

Sedehi

et al. 2023

International Journal of Chemical Engineering

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Backgroundand Aim. Natural organic matter (NOM) has become one of the most serious environmental problems due to its persistence in aqueous solutions and the risk of carcinogenesis. In this study, the removal efficiencies of real and synthetic humic acid (HA) by multi-walled carbon nanotubes (MWCNTs) coated with iron oxide were evaluated. Materials and Methods. The MWCNs were synthesized and coated with iron oxide. In addition, the effects of pH, contact time, mixing speed, and adsorbent dose on the removal efficiency of NOM by MWCNTs-Fe3O4 were studied. Then, the removal efficiency of NOM from real samples was investigated at optimal conditions. The MWCNT-Fe3O4 was characterized by scanning electron microscopy (SEM) test and X-ray diffraction (XRD), respectively. Data analysis was performed using Minitab software based on the Taguchi method. Results. The results showed that MWCNTs were coated with Fe3O4. The SEM test shows particle (MWCNTs-Fe3O4) size in the range of 48–143 nm, and the particles have uniform spherical shapes. Enix software was used to identify the phase in this sample. The conditions including p H = 3 , mixing speed = 120 rpm, adsorbent dosage = 1.5 g·L−1, and contact time = 90 minutes were selected as optimal for NOM adsorption. The mean removal efficiencies of NOM in synthetic samples at 5, 10, and 20 mg·L−1 concentrations were 86.6%, 84.87%, and 95.41%, respectively. In addition, the mean removal efficiency of NOM in Choghakhor Wetland was 77%. Conclusion. Our findings demonstrated that the MWCNTs-Fe3O4 can be potentially used as an adsorbent for removing natural organic matter (HA) from aqueous solutions.

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Equilibrium, kinetic, and thermodynamic studies on the biosorption of lead by human metallothionein gene‐cloned bacteria as a novel biosorbent

Akkurt,

Uçkun,

Oğuz

et al. 2024

Water Environment Research

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Heavy metals are the main pollutants in water and are an important global problem that threatens human health and ecosystems. In recent years, there has been an increasing interest in the use of genetically modified bacteria as an eco‐friendly method to solve heavy metal pollution problems. The goal of this study was to generate genetically modified Escherichia coli expressing human metallothioneins (hMT2A and hMT3) and to determine their tolerance, bioaccumulation, and biosorption capacity to lead (Pb2+). Recombinant MT2A and MT3 strains expressing MT were successfully generated. Minimum inhibition concentrations (MIC) of Pb for MT2A and MT3 were found to be 1750 and 2000 mg L−1, respectively. Pb2+ resistance and bioaccumulation capacity of MT3 were higher than MT2A. Therefore, only MT3 biosorbent was used in Pb2+ biosorption, and its efficiency was examined by performing experiments in a batch system. Pb2+ biosorption by MT3 was evaluated in terms of isotherms, kinetics, and thermodynamics. The results showed that Pb biosorption fits to the Langmuir isotherm model and the pseudo‐first‐order kinetic model, and the reaction is exothermic. The maximum Pb2+ capacity of the biosorbent was 50 mg Pb2+g−1. The potential of MT3 in Pb biosorption was characterized by Fourier‐transform infrared spectroscopy (FT‐IR), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) analyses. The desorption study showed that the sorbent had up to 74% recovery and could be effectively used four times. These findings imply that this biosorbent can be applied as a promising, precise, and effective means of removing Pb2+ from contaminated waters.Practitioner Points In this study, the tolerance levels, bioaccumulation, and biosorption capacities of Pb in aqueous solutions were determined for the first time in recombinant MT2A and MT3 strains in which human MT2A and MT3 genes were cloned. The biosorbent of MT3, which was determined to be more effective in Pb bioaccumulation, was synthesized and used in Pb biosorption. The Pb biosorption mechanism of MT3 biosorbent was identified using isotherm modeling, kinetic modeling, and thermodynamic studies. The maximum Pb removal percentage capacity of the biosorbent was 90%, whereas the maximum biosorption capacity was up to 50 mg Pb2+g−1. These results indicated that MT3 biosorbent has a higher Pb biosorption capacity than existing recombinant biosorbents. MT3 biosorbent can be used as a promising and effective biosorbent for removing Pb from wastewater.

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Equilibrium and Thermodynamic Studies on the Biosorption of Lead (II) by Living and Nonliving Biomass of Penicillium notatum

Cited by 8 publications

References 38 publications

Evaluation of Pb (II) Removal by Tea Pulp Modified with Magnetite Nanoparticle

Evaluation of Pb (II) Removal by Tea Pulp Modified with Magnetite Nanoparticle

Removal of Natural Organic Matter (NOM) from Aqueous Solutions by Multi-Walled Carbon Nanotube Modification with Magnetic Fe3O4 Nanoparticles

Equilibrium, kinetic, and thermodynamic studies on the biosorption of lead by human metallothionein gene‐cloned bacteria as a novel biosorbent

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