TY - JOUR A1 - Bekhoukh, Amina A1 - Kiari, Mohamed A1 - Moulefera, Imane A1 - Sabantina, Lilia A1 - Benyoucef, Abdelghani ED - Criado-Gonzalez, Miryam ED - Rojo del Olmo, Luis T1 - New Hybrid Adsorbents Based on Polyaniline and Polypyrrole with Silicon Dioxide: Synthesis, Characterization, Kinetics, Equilibrium, and Thermodynamic Studies for the Removal of 2,4-Dichlorophenol JF - Polymers N2 - In the current study, polyaniline and polypyrrole with silicon dioxide (PAni:PPy@SiO2) were combined to formulate a new adsorbent, which was examined using XRD, TEM, SEM, FTIR, TGA, and BET, and the adsorption kinetics were investigated by UV–vis spectroscopy. The optical band gap was also evaluated. The electrochemical behavior was investigated using cyclic voltammograms. Moreover, experimental conditions were used to evaluate the 2,4-dichlorophenol (2,4-DCP) adsorption based on the pH, temperature, reaction time, and initial concentration. The analytical isotherm data were determined by Langmuir, Freundlich, Temkin, Sips, and Redlich–Peterson models. For the analysis of the kinetic data, the pseudo-first- and -second-order models and the intraparticle diffusion model were investigated. It was found that this new adsorbent possessed the highest adsorption efficiency after several regeneration cycles. Furthermore, the thermodynamic parameters of adsorption, such as entropy (ΔS), enthalpy (ΔH), and standard Gibbs were measured. These results suggest that the PAni:PPy backbone can generally be better applied for the elimination of 2,4-dichlorophenol by appropriately dispersing it over the surface of suitable SiO2. This search provides a novel way to develop separable, high-performance adsorbents for adsorbing organic contamination from wastewater. KW - polypyrrole KW - polyaniline KW - 2,4-dichlorophenol KW - silicon dioxide KW - adsorption KW - Polyaniline KW - Polypyrrole KW - Dichlorphenole KW - Adsorption Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:523-17000 SN - 2073-4360 VL - 15 IS - 9 PB - MDPI ER - TY - JOUR A1 - Benchikh, Imen A1 - Ezzat, Abdelrahman Osama A1 - Sabantina, Lilia A1 - Benmimoun, Youcef A1 - Benyoucef, Abdelghani ED - Wu, Ming-Chung T1 - Investigation of Hybrid Electrodes of Polyaniline and Reduced Graphene Oxide with Bio-Waste-Derived Activated Carbon for Supercapacitor Applications JF - Polymers N2 - Graphene-based materials have been widely studied in the field of supercapacitors. However, their electrochemical properties and applications are still restricted by the susceptibility of graphene-based materials to curling and agglomeration during production. This study introduces a facile method for synthesizing reduced graphene oxide (rGO) nanosheets and activated carbon based on olive stones (OS) with polyaniline (PAni) surface decoration for the development of supercapacitors. Several advanced techniques were used to examine the structural properties of the samples. The obtained PAni@OS−rGO (1:1) electrode exhibits a high electrochemical capacity of 582.6 F·g−1 at a current density of 0.1 A·g−1, and an energy density of 26.82 Wh·kg−1; thus, it demonstrates potential for efficacious energy storage. In addition, this electrode material exhibits remarkable cycling stability, retaining over 90.07% capacitance loss after 3000 cycles, indicating a promising long cycle life. Overall, this research highlights the potential of biomass-derived OS in the presence of PAni and rGO to advance the development of high-performance supercapacitors. KW - Organischer Abfall KW - bio-waste KW - activated carbon KW - reduced graphene oxide KW - polyaniline KW - supercapacitor KW - Aktivkohle KW - Graphen KW - Polyaniline KW - Superkondensator Y1 - 2024 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:523-18194 SN - 2073-4360 VL - 16 IS - 3 PB - MDPI ER - TY - JOUR A1 - Chouli, Faiza A1 - Ezzat, Abdelrahman Osama A1 - Sabantina, Lilia A1 - Benyoucef, Abdelghani A1 - Zehhaf, Abdelhafid ED - Baláž, Matej T1 - Optimization Conditions of Malachite Green Adsorption onto Almond Shell Carbon Waste Using Process Design JF - Molecules N2 - Almond shell-based biocarbon is a cheap adsorbent for the removal of malachite green, which has been investigated in this work. FT-IR, DRX, and BET were used to characterize almond shell-based biocarbon. The nitrogen adsorption-desorption isotherms analysis results showed a surface area of 120.21 m2/g and a type H4 adsorption isotherm. The parameters of initial dye concentration (5–600 mg.L−1), adsorbent mass (0.1–0.6 mg), and temperature (298–373 K) of adsorption were investigated. The experiments showed that the almond shell could be used in a wide concentration and temperature range. The adsorption study was fitted to the Langmuir isotherm and the pseudo-second-order kinetic model. The results of the FT-IR analysis demonstrated strong agreement with the pseudo-second-order chemisorption process description. The maximum adsorption capacity was calculated from the Langmuir isotherm and evaluated to be 166.66 mg.g−1. The positive ∆H (12.19 J.mol−1) indicates that the adsorption process is endothermic. Almond shell was found to be a stable adsorbent. Three different statistical design sets of experiments were taken out to determine the best conditions for the batch adsorption process. The optimal conditions for MG uptake were found to be adsorbent mass (m = 0.1 g), initial dye concentration (C0 = 600 mg.L−1), and temperature (T = 25 °C). The analysis using the D-optimal design showed that the model obtained was important and significant, with an R2 of 0.998. KW - Malachit KW - almond shell KW - malachite green KW - adsorption KW - thermodynamic study KW - kinetic study KW - design process KW - Mandel KW - Adsorption KW - Thermodynamik KW - Kinetik KW - Prozessauslegung Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:523-18238 SN - 1420-3049 VL - 29 IS - 1 PB - MDPI ER - TY - JOUR A1 - Mamun, Al A1 - Kiari, Mohamed A1 - Benyoucef, Abdelghani A1 - Sabantina, Lilia ED - García Martín, Juan Francisco T1 - Advancement of Electrospun Carbon Nanofiber Mats in Sensor Technology for Air Pollutant Detection † JF - Engineering Proceedings N2 - The use of electrospun carbon nanofibers (ECNs) has been the focus of considerable interest due to their potential implementation in sensing. These ECNs have unique structural and morphological features such as high surface area-to-volume ratio, cross-linked pore structure, and good conductivity, making them well suited for sensing applications. Electrospinning technology, in which polymer solutions or melts are electrostatically deposited, enables the production of high-performance nanofibers with tailored properties, including fiber diameter, porosity, and composition. This controllability enables the use of ECNs to optimize sensing applications, resulting in improved sensor performance and sensitivity. While carbon nanofiber mats have potential for sensor applications, several challenges remain to improve selectivity, sensitivity, stability and scalability. Sensor technologies play a critical role in the global sharing of environmental data, facilitating collaboration to address transboundary pollution issues and fostering international cooperation to find solutions to common environmental challenges. The use of carbon nanofibers for the detection of air pollutants offers a variety of possibilities for industrial applications in different sectors, ranging from healthcare to materials science. For example, optical, piezoelectric and resistive ECNs sensors effectively monitor particulate matter, while chemoresistive and catalytic ECNs sensors are particularly good at detecting gaseous pollutants. For heavy metals, electrochemical ECNF sensors offer accurate and reliable detection. This brief review provides in-sights into the latest developments and findings in the fabrication, properties and applications of ECNs in the field of sensing. The efficient utilization of these resources holds significant potential for meeting the evolving needs of sensing technologies in various fields, with a particular focus on air pollutant detection. KW - sensors KW - sensors KW - electrospun nanofiber mats KW - carbon nanofibers KW - air pollutant detection KW - nanofibers Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:523-19959 SN - 2673-4591 VL - 67 IS - 1 PB - MDPI ER -