Yazar "Kholikov, Abduvali" seçeneğine göre listele

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    Ionic liquids as green and sustainable corrosion inhibitors I
    (Elsevier, 2022) Berdimurodov, Elyor; Kholikov, Abduvali; Akbarov, Khamdam; Guo, Lei; Umirov, Nurbek; Verma, Dakeshwar Kumar; Rbaa, Mohamed
    The corrosion of metal materials is an ongoing problem in the chemical industry. The use of sustainable and green technologies in corrosion protection is a very important task, because, the rise in environmental and ecological awareness. Currently, ionic liquids (ILs) based corrosion inhibitors are widely performed to protect the metal materials from the aggressive corrosion environment in the chemical industry. This is due to the ionic liquids are environmental-friendly, more sustainable, and have excellent corrosion-resistance organic molecules at low concentrations. In addition, the ILs are good soluble, non-toxic behaviour, non-inflammability, low volatility, good adsorbent, high thermal, and chemical stable in the aggressive medium. Besides, ILs have large planer anionic and cationic groups, which support an intermolecular synergism behavior; as a result, the adsorption of ILs is increased. These properties make ILs be a more efficient inhibitor. The ILs effectively protect the metal materials included steel, copper, magnesium, zinc and aluminum in the acid cleaning, descaling, pickling, gas or oil processes and desalination applications. In this chapter, the types, inhibition mechanism, inhibition properties of ILs, theoretical and experimental insights in the ILs inhibition mechanism were reviewed. © 2022 Elsevier Inc. All rights reserved.
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    Main concepts and applications of DFTB approach
    (Elsevier, 2023) Berdimurodov, Elyor; Guo, Lei; Kholikov, Abduvali; Akbarov, Khamdam; Kaya, Savaş
    Currently, the density functional based tight binding (DFTB) method is widely used and very important in the material and technology sciences. This is due to the DFTB-based theoretical calculation being around 100–1000 times faster than the density functional theory (DFT), having low cost, being more accurate, and providing calculations which are 96–99% close to the experimental results. DFTB is based on a second-order development of the Kohn–Sham total energy in DFT. In this chapter, the basic concepts of DFTB such the minimal atomic basis set, matrix elements, total energy, expanded total energy in DFTB, as well as second- and third-order DFTB versions are reviewed. The modern DFTB applications including the atomic clusters, molecular clusters, nanoparticles, crystals, corrosion inhibitors, molecular dynamic (MD) simulations, thermodynamics, and vibrational spectra are reviewed. © 2023 Elsevier Inc. All rights reserved.
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    New and Green Corrosion Inhibitor Based on New Imidazole Derivate for Carbon Steel in 1 M HCl Medium: Experimental and Theoretical Analyses
    (Trans Tech Publications Ltd, 2022) Berdimurodov, Elyor; Kholikov, Abduvali; Akbarov, Khamdam; Guo, Lei; Kaya, Savas; Verma, Dakeshwar Kumar; Rbaa, Mohamed
    In this research work, a new and green corrosion inhibitor based on new imidazole derivate (IMD) was introduced for carbon steel in 1 M HCl medium. Its inhibition properties were fully characterised by the gravimetric, electrochemical, surface and quantum chemical analyses. The experimental results confirmed that the inhibition efficiency of IMD was over 99% at 150 mg/L, forming a protective hydrophobic film on the metal surface, which maximally blocked the cathodic and anodic corrosive processes by adsorption. The electrochemical results suggested that the IMD is a mixed-type inhibitor. The adsorption behaviour of IMD was obeyed by Langmuir isotherms. The gravimetric results show that the inhibition efficiency depends on the change of concentration and temperature. The experimental tests were supported by the DFT (density functional theory) measurements, and a good relationship was found among these tests. The observed results of the surface analysis indicated that the metal surface was seriously improved with the presence of IMD.
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    Novel bromide-cucurbit[7]uril supramolecular ionic liquid as a green corrosion inhibitor for the oil and gas industry
    (Elsevier Science Sa, 2021) Berdimurodov, Elyor; Kholikov, Abduvali; Akbarov, Khamdam; Guo, Lei; Kaya, Savas; Katin, Konstantin P.; Verma, Dakeshwar Kumar
    Metal corrosion is the largest problem in the oil and gas industry. Therefore, providing metallic materials with corrosion protection is an urgent task in modern research. The use of green corrosion inhibitors for corrosion protection is very important both ecologically and economically. This work is the first to introduce a novel bromide-cucurbit[7]uril (BrCU) supramolecular ionic liquid as an excellent corrosion inhibitor for the oil and gas industry. Its inhibition behaviour for carbon steel in 1 M NaCl saturated with CO2 and H2S was first fully identified through the use of thermodynamic and gravimetric analysis, electrochemical noise (EN), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), density functional theory (DFT), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) methods. The experimental results confirmed that BrCU is an excellent environmentally friendly corrosion inhibitor for the gas and oil industry. Its inhibition efficiency was 97.54% at 100 mg/ L/0.06 mM, and it was more stable at high temperature (333 K). A Langmuir isotherm was applied to identify the adsorption character of BrCU on the metal surface. The obtained PDP data suggested that BrCU was a predominantly anodic mixed-type corrosion inhibitor. Theoretical calculations showed good correlation with the experimental results, indicating that the halogen modification in the supramolecular ionic liquid system improved the inhibition performance.
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    Novel cucurbit[6]uril-based [3]rotaxane supramolecular ionic liquid as a green and excellent corrosion inhibitor for the chemical industry
    (Elsevier, 2022) Berdimurodov, Elyor; Kholikov, Abduvali; Akbarov, Khamdam; Guo, Lei; Katin, Konstantin P.; Verma, Dakeshwar Kumar; Rbaa, Mohamed
    The corrosion of steel materials in alkaline-saline media is the largest problem in industry. Economical and environmentally friendly corrosion inhibitors are crucial for corrosion protection. The present work is the first to introduce a novel cucurbit[6]uril-based [3]rotaxane supramolecular ionic liquid (CB6-based [3]rotaxane) as a green and efficient corrosion inhibitor for the chemical industry. The correlation between the supramolecular ionic liquid system and inhibition behavior was studied first. The inhibition characteristics of CB6-based [3] rotaxane in 1 M OH- + 1 M Cl- solution were first fully investigated by thermodynamic, gravimetric, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), electrochemical noise (EN), cyclic voltammetry (CV), density functional theory (DFT), molecular dynamics (MD) simulation, scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX) methods. The experimental results confirmed that CB6-based [3]rotaxane exhibited excellent corrosion resistance, and its inhibition efficiency was 97.97% at 100 mg/L and 0.032 mM. The electrochemical results suggested that (i) CB6-based [3]rotaxane was a mixed-type corrosion inhibitor with anodic dominance; (ii) the supramolecular part of selected ionic liquid is responsible for notably blocks the charge transfer process on the metal surface. The theoretical findings correlated well with the experimental results and revealed that the protonated form of this supramolecular structure exhibited better performance than its neutral form. MD simulations results suggested that the bond length of the Fe(surface)inhibitor (3.127 angstrom) is less than 3.5 angstrom, which indicates that chemisorption is dominant in the investigated adsorption system. Molecular electrostatic potential analysis confirmed that the studied ionic liquidsupramolecular system contained most favorable nucleophilic centers, which are responsible for excellent inhibition performance.
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    Novel glycoluril pharmaceutically active compound as a green corrosion inhibitor for the oil and gas industry
    (Elsevier Science Sa, 2022) Berdimurodov, Elyor; Kholikov, Abduvali; Akbarov, Khamdam; Guo, Lei; Kaya, Savas; Verma, Dakeshwar Kumar; Rbaa, Mohamed
    Background: The corrosion of St3 steel in 1 M NaCl saturated with CO2 and H2S is a large problem in the chemical industry; therefore, creating green and more efficient inhibitors is an urgent task. However, there have been extremely limited research results related to this problem. In this research, a novel glycoluril pharmaceutically active compound (GCU) was first introduced as a green corrosion inhibitor for St3 steel in 1 M NaCl saturated with CO2 and H2S. Methods: The inhibition properties of the novel glycoluril pharmaceutically active compound were fully characterized by thermodynamic, gravimetric, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), electrochemical frequency modulation (EFM), linear polarization resistance (LPR), density functional theory (DFT), molecular dynamics (MD) simulation, scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX) methods. Significant findings: The obtained results indicated that this inhibitor is an excellent inhibitory molecule, and its maximum protection degree was 95.62% at 100 mg/L/0.08 mM. The adsorption behaviour of this inhibitor was characterized from a Langmuir isotherm. Electrochemical studies demonstrated that this molecule is a mixed-type corrosion inhibitor. The theoretical calculations indicated a good correlation with the experimental results and confirmed that the adsorption-inhibition character depends on the molecular structure of the inhibitor and that the protonated form of the inhibitor is more inhibited than its neutral form.
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    Novel gossypol-indole modification as a green corrosion inhibitor for low-carbon steel in aggressive alkaline-saline solution
    (Elsevier, 2022) Berdimurodov, Elyor; Kholikov, Abduvali; Akbarov, Khamdam; Guo, Lei; Kaya, Savas; Katin, Konstantin P.; Verma, Dakeshwar Kumar
    The corrosion of low-carbon steel in aggressive alkaline-saline environments is a very large problem. Protecting low-carbon steel from corrosion in aggressive alkaline-saline solutions using green inhibitors is a very important task in industry. However, there are no studies related to low-carbon steel corrosion in aggressive alkaline-saline environments. Green type corrosion inhibitors are an interesting topic of research. However, currently, the studied type inhibitors are not efficient at low concentrations, and there are no studies on them in aggressive alkaline-saline environments in regard to steel corrosion. In this research work, a novel gossypol-indole modification (GIM) is introduced as a green corrosion inhibitor for low-carbon steel in an aggressive alkaline-saline environment. This inhibitor is a large, highly planar structural molecule that is more water soluble than other inhibitors. Its inhibition behavior is stable at high temperatures, and it contains a large number of electron-rich heteroatoms. All of these properties make it an excellent corrosion inhibitor. The inhibition performance of the novel gossypol-indole modification for low-carbon steel in 1 M NaOH + 1 M NaCl is fully characterized by thermodynamic, gravimetric, electrochemical frequency modulation (EFM), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy (EIS), density functional theory (DFT), molecular dynamics (MD) simulations, scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDX) methods. The results confirm that the novel gossypol-indole modification is an excellent inhibitor, with a maximum inhibition efficiency of 96.01% at 100 mg/L and 0.112 mM. The adsorption behavior follows the Langmuir isotherm. Electrochemical studies have indicated that this modified is a mixed-type corrosion inhibitor, and the theoretical investigations correlate well with the experimental results.
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    Phytochemicals/Plant Extracts as Corrosion Inhibitors for Magnesium in H2SO4Solutions
    (CRC Press, 2024) Berdimuradov, Khasan; Kholikov, Abduvali; Akbarov, Khamdam; Berdimurodov, Elyor; Ibrahimi, Brahim El; Tuzun, Burak; Es-Soufi, Hicham
    This chapter provides a comprehensive overview of utilizing phytochemicals and plant extracts as green, sustainable corrosion inhibitors for magnesium metal in contact with sulfuric acid (H2SO4) solutions. It begins by highlighting the importance of effective corrosion inhibition for magnesium alloys across industrial applications. The role of phytochemicals as corrosion inhibitors is then discussed, including their extraction from plant sources, adsorption mechanisms, structural effects, and comparative advantages over traditional inhibitors. Key topics covered include phytochemical characterization techniques, quantitative structure–activity relationship modeling, optimization strategies, case studies demonstrating their inhibition efficacy, and challenges associated with their large-scale production and application. The environmental and economic benefits of phytochemicals over conventional inhibitors are emphasized. This chapter concludes by underscoring the promise of phytochemicals as an emerging alternative for efficient and eco-friendly corrosion protection of magnesium alloys in acidic conditions across industries. © 2024 selection and editorial matter, Chandrabhan Verma, Ashish Kumar, and Abhinay Thakur; individual chapters, the contributors. All rights reserved.