Article
Environmental Sciences
Lina Ramirez Arenas, Philippe Le Coustumer, Stephan Ramseier Gentile, Stephane Zimmermann, Serge Stoll
Summary: The presence of nanoparticles in drinking water raises concerns about their potential risks to human health and the efficacy of water treatment plants in removing them. This study examines the efficiency of granular activated carbon (GAC) in removing CeO2 nanoparticles. The results show that GAC has a good affinity for nanoparticles, with higher adsorption capacity and removal efficiency in lake water compared to ultrapure water. The adsorption mechanism is mainly controlled by electrostatic attractions, and mass transfer processes play a role in the removal of nanoparticles in lake water.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Chemical
Diana Hernandez-Monje, Liliana Giraldo, Jaroslaw Serafin, Juan Carlos Moreno-Pirajan
Summary: Activated carbons with different physicochemical characteristics were studied to determine their interactions with hydrocarbons. The enthalpy of immersion was determined to evaluate the influence of adsorbents and adsorbates, as well as the addition of another adsorbate. The results showed that the interaction increased with thermal treatment and decreased with chemical modification, both in pure solvents and mixtures. The CO2 adsorption of activated carbons ranged from 3.43 to 3.79 mmol g(-1).
Article
Environmental Sciences
P. Samiyammal, A. Kokila, L. Arul Pragasan, Rajakrishnan Rajagopal, Rengasamy Sathya, S. Ragupathy, M. Krishnakumar, Vasudeva Reddy Minnam Reddy
Summary: This study investigated the characteristics of activated carbon from cashew nut shell produced by potassium hydroxide activation at 600 degrees C in an N2 atmosphere. The sample obtained with a CNS/KOH ratio of 1:1 had the highest surface area compared to other ratio samples. The effects of contact time, pH, adsorbent dose, and initial dye concentration on brilliant green (BG) removal efficiency were studied using the CNS/KOH ratio of 1:1 sample as the adsorbent. The Langmuir isotherm provided the best fit for the experimental equilibrium data, with a maximum BG adsorption capacity of 243.90 mg/g.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Physical
Marie-Vanessa Coulet, Loic Gourmellen, Renaud Denoyel
Summary: The energetics of sulfur-carbon interaction were investigated using experimental methods, and it was found that different types of carbon materials show similar surface-liquid interactions with liquid sulfur, which can wet the entire surface accessible to nitrogen.
Article
Thermodynamics
Gautam, Satyabrata Sahoo
Summary: The current research focuses on characterizing and comparing the physiochemical properties of seven commercially available activated carbons (ACs) as adsorbents for CO2 capture. The study found that the selected ACs have high micro and ultra-micro porosity, making them suitable for post-combustion CO2 capture. The study also estimated important thermodynamic properties of adsorption and confirmed that the selected ACs are suitable for various gas sorption applications.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Engineering, Chemical
Chaiyot Tangsathitkulchai, Suravit Naksusuk, Atichat Wongkoblap, Poomiwat Phadungbut, Prapassorn Borisut
Summary: The study investigated the equilibrium and kinetics of CO2 adsorption by coconut-shell activated carbon impregnated with sodium hydroxide at 273 K. The CO2 adsorption increased with NaOH loading and exhibited three distinctive regions. The results showed an empirical correlation between effective pore diffusivity, CO2 adsorption, and NaOH loading.
Article
Chemistry, Physical
Xiao-Ting Zhen, Ya-Ling Yu, Min-Zhen Shi, Si-Chen Zhu, Tian-Ci Yan, Zi-Xuan Yue, Yu-Xin Gu, Hui Zheng, Jun Cao
Summary: This study prepared Hawthorn kernel activated carbon (HKAC) using a two-step method involving carbonization and thermal activation with potassium hydroxide. The HKAC exhibited good morphological integrity and crystalline state, and had a high specific surface area and pore volume. The optimal adsorption conditions were determined to be a carbonization temperature of 550 degrees C, HKAC concentration of 0.6 g/L, solution temperature of 60 degrees C, and pH of 6.0. The experimental results showed that HKAC was a cost-effective and green adsorbent for removing water and plants contaminated with fungicides.
SURFACES AND INTERFACES
(2022)
Article
Engineering, Chemical
Karolina Kielbasa, Joanna Srenscek-Nazzal, Beata Michalkiewicz
Summary: The focus of the study was on modifying commercial activated carbons to increase their porosity and CH4 capture potential. Experimental results showed that modified activated carbons had a higher CH4 adsorption capacity at 25 degrees C and 35 bar pressure, with a good fit using the Sips equation.
Article
Thermodynamics
Gautam, Satyabrata Sahoo
Summary: The research focuses on characterizing and comparing seven commercially available activated carbons as adsorbents for CO2 capture, revealing their suitability for various gas sorption applications and providing valuable properties for actual system design.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Environmental Sciences
Sergio Acevedo, Liliana Giraldo, Juan C. Moreno-Pirajan
Summary: This study examines the adsorption kinetics of activated carbon (AC) adsorbent materials produced from a by-product of African palm processing. The textural characteristics of the adsorbent solids were determined through N-2 physisorption, revealing BET areas between 721 and 1334 m(2)g(-1) and micropore volumes between 0.33 and 0.55 cm(3)g(-1). FTIR was used for chemical characterization, and CO2 adsorption was measured, showing values between 175 and 274 mg·g(-1). The kinetic study suggests that the intraparticle diffusion model best describes the physisorption process.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Chemistry, Physical
Tarik Avcu, Osman Uner, Unal Gecgel
Summary: This study analyzed the adsorption of diclofenac sodium on sycamore ball activated carbon surface, examining various parameters and using different models. The results showed that sycamore ball activated carbon is an effective adsorbent for sodium diclofenac adsorption, with high adsorption capacity and fast kinetics.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Hamza Laksaci, Badreddine Belhamdi, Omar Khelifi, Aissa Khelifi, Mohamed Trari
Summary: In this study, coffee waste activated carbon (SAC) was synthesized and evaluated as a potential material for removing amoxicillin from water. The synthesis conditions and operating parameters were optimized, and the adsorption isotherms and electrolyte effects were analyzed. The reusability of the adsorbent was also investigated.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Environmental Sciences
Durai Mani, Duraisamy Elango, Latifah A. Al-Humaid, S. Ragupathy, Palaniyappan Jayanthi, Young -Ho Ahn, A. Priyadharsan, Nora Dahmash Al-Dahmash
Summary: Groundnut shell activated carbon (GNSAC) was prepared from groundnut shells using KOH at 600°C in a N2 atmosphere. The properties of the produced GNSAC were examined using various analytical techniques. It was found that an activating temperature of 600°C and an impregnation ratio of 1:1 were optimal for achieving the highest surface area. The optimized GNSAC showed promising adsorption efficiency for the removal of methylene blue dye.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Joon Hyuk Lee, Su Ji Sim, Ju Hui Kang, Sang Sun Choi
Summary: Porous carbon fibers were designed with CO2 activation for enhanced malachite green adsorption, characterized both experimentally and numerically to reveal the physiochemical mechanisms, resulting in high specific surface area and effective adsorption performance. Adsorption isotherm fits Langmuir model with high maximum adsorption capacity, and regeneration rate over 80% was achieved in multiple trials. Thermodynamics analysis showed endothermic and spontaneous nature of the adsorption process.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Thermodynamics
Paola Rodriguez-Estupinan, Ingrid Miranda-Carvajal, Paula Cantor Campos, Carlos Alberto Guerrero-Fajardo, Liliana Giraldo, Juan Carlos Moreno-Pirajan
Summary: This review paper focuses on the synthesis methods of graphene-based materials and the characterization of their thermal properties and surface-molecule interactions using calorimetric techniques. The results show that graphene materials are well dispersed and exhibit improved mechanical and electrical properties in nanocomposites. Graphene is compatible with metals such as aluminum, while GO is compatible with silver, leading to decorated nanocomposites.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Review
Chemistry, Multidisciplinary
Nadia Morin-Crini, Eric Lichtfouse, Marc Fourmentin, Ana Rita Lado Ribeiro, Constantinos Noutsopoulos, Francesca Mapelli, Eva Fenyvesi, Melissa Gurgel Adeodato Vieira, Lorenzo A. Picos-Corrales, Juan Carlos Moreno-Pirajan, Liliana Giraldo, Tamas Sohajda, Mohammad Mahmudul Huq, Jafar Soltan, Giangiacomo Torri, Monica Magureanu, Corina Bradu, Gregorio Crini
Summary: The rise of emerging contaminants presents challenges for the scientific community and water treatment stakeholders to develop remediation techniques that are simple, practical, inexpensive, effective, and environmentally friendly. Adsorption-oriented processes and advanced oxidation processes are the most promising strategies for removing emerging contaminants in wastewater.
ENVIRONMENTAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Emilian Chifor, Ion Bordeianu, Crina Anastasescu, Jose Maria Calderon-Moreno, Veronica Bratan, Diana-Ioana Eftemie, Mihai Anastasescu, Silviu Preda, Gabriel Plavan, Diana Pelinescu, Robertina Ionescu, Ileana Stoica, Maria Zaharescu, Ioan Balint
Summary: This work presents the synthesis and characterization of nanostructured TiO2 modified with noble metal nanoparticles (Au, Ag) and lysozyme. The structural and functional properties of these inorganic and hybrid materials were explored, aiming to develop efficient dental implants with intrinsic antibacterial activity.
Review
Chemistry, Multidisciplinary
Oscar Javier Fonseca-Bermudez, Liliana Giraldo, Rocio Sierra-Ramirez, Juan Carlos Moreno-Pirajan
Summary: This article reviews the methods of removing hydrogen sulfide from biogas through biological treatment, chemical treatment, porous solid treatment, and photocatalysis. Adsorption and photocatalysis methods are compared, and it is found that photocatalysis is an affordable alternative method.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Mariana Chelu, Adina Magdalena Musuc, Ludmila Aricov, Emma Adriana Ozon, Andreea Iosageanu, Laura M. Stefan, Ana-Maria Prelipcean, Monica Popa, Jose Calderon Moreno
Summary: This research describes a new methodology for obtaining biocompatible hydrogels based on Aloe vera for wound healing applications. Two hydrogels (AV5 and AV10) with different concentrations of Aloe vera were prepared using an all-green synthesis method from renewable and bioavailable materials. The hydrogels showed good antibacterial properties and promoted cell proliferation, migration, and wound closure. This Aloe vera based hydrogel may be suitable for wound healing applications based on its morphology, rheological properties, cytocompatibility, and cell viability.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Hermine Stroescu, Madalina Nicolescu, Daiana Mitrea, Ecaterina Tenea, Irina Atkinson, Mihai Anastasescu, Jose Maria Calderon-Moreno, Mariuca Gartner
Summary: ZnO and Al-doped ZnO (AZO) thin films were prepared using the sol-gel method and their properties were analyzed. The structure and morphology analyses showed that the thin films are polycrystalline with a hexagonal wurtzite structure. The introduction of defects and an increase in the charge carrier density in the AZO film were observed.
Article
Polymer Science
Mariana Chelu, Monica Popa, Emma Adriana Ozon, Jeanina Pandele Cusu, Mihai Anastasescu, Vasile Adrian Surdu, Jose Calderon Moreno, Adina Magdalena Musuc
Summary: The present research focuses on studying the properties of hydrogels made from allantoin, xanthan gum, salicylic acid, and different concentrations of Aloe vera. The evaluation included thermal behavior, chemical structure, morphology, and pharmacotechnical properties of the hydrogels. Results showed that the addition of Aloe vera led to interactions with the hydrogel matrix, and a formulation with 10% Aloe vera concentration was found suitable for biomedical applications.
Article
Materials Science, Multidisciplinary
Ana-Maria Julieta Popescu, Florina Branzoi, Marian Burada, Jose Calderon Moreno, Mihai Anastasescu, Ioana Anasiei, Mihai Tudor Olaru, Virgil Constantin
Summary: We investigate the corrosion behavior on the microstructure of CoCrFeMnNi high-entropy thin film potentiodynamic alloys electrodeposited on aluminum support. The HEA components were co-deposited on an aluminum foil substrate using different electrolytes and various metal substances. The study demonstrates that the electrodeposition of HEA thin films on an aluminum support is more difficult and has lower corrosion resistance compared to previous work.
Article
Engineering, Chemical
Diana Hernandez-Monje, Liliana Giraldo, Jaroslaw Serafin, Juan Carlos Moreno-Pirajan
Summary: Activated carbons with different physicochemical characteristics were studied to determine their interactions with hydrocarbons. The enthalpy of immersion was determined to evaluate the influence of adsorbents and adsorbates, as well as the addition of another adsorbate. The results showed that the interaction increased with thermal treatment and decreased with chemical modification, both in pure solvents and mixtures. The CO2 adsorption of activated carbons ranged from 3.43 to 3.79 mmol g(-1).
Article
Biochemistry & Molecular Biology
Crina Anastasescu, Simona Neagu, Silviu Preda, Daniela Culita, Mihaela Stancu, Cristian Banciu, Cornel Munteanu, Veronica Bratan, Jose Maria Calderon-Moreno, Razvan State, Mihai Anastasescu, Madalin Enache, Ioan Balint, Maria Zaharescu
Summary: ZnSe, ZnSe-TiO2, and TiO2 materials were synthesized using hydrothermal and sol-gel methods, and their antibacterial activity against Staphylococcus aureus and Micrococcus lysodeikticus was studied. The samples were characterized using microscopy techniques, UV-visible spectroscopy, and their ability to generate reactive oxygen species under visible light irradiation was investigated. The results showed a correlation between antibacterial activity and ROS photogeneration.
Article
Polymer Science
Mariana Chelu, Paul Chesler, Cristian Hornoiu, Mihai Anastasescu, Jose Maria Calderon-Moreno, Daiana Mitrea, Costin Brasoveanu, Carmen Moldovan, Mariuca Gartner
Summary: Detection of greenhouse gases is necessary due to the rapid diffusion of harmful gases over large areas in a short time, causing air pollution and leading to catastrophic climate change over time.
Article
Polymer Science
Mariana Chelu, Monica Popa, Jose Calderon Moreno, Anca Ruxandra Leonties, Emma Adriana Ozon, Jeanina Pandele Cusu, Vasile Adrian Surdu, Ludmila Aricov, Adina Magdalena Musuc
Summary: The design of an efficient adsorbent hydrogel based on chitosan, polyethylene glycol 4000 (PEG4000), and xanthan gum (CPX) has been developed for the removal of diclofenac sodium (DCF) from water. The CPX hydrogel showed high viscosity and mechanical stability due to the interaction between chitosan, xanthan gum, and PEG4000. The synthesized hydrogel exhibited pH-independent swelling behavior and achieved a high adsorption capacity for DCF. This study demonstrates the potential of CPX hydrogel as an environmentally friendly option for removing pharmaceutical contaminants from wastewater.
Article
Chemistry, Physical
Maria Covei, Cristina Bogatu, Silvioara Gheorghita, Anca Duta, Hermine Stroescu, Madalina Nicolescu, Jose Maria Calderon-Moreno, Irina Atkinson, Veronica Bratan, Mariuca Gartner
Summary: Researchers have successfully prepared sol-gel titanium dioxide thin films on spherical beads, which have high surface area and easy recovery, and exhibit good photocatalytic activity.
Review
Polymer Science
Mariana Chelu, Adina Magdalena Musuc, Monica Popa, Jose Calderon Moreno
Summary: This study provides a comprehensive overview of recent advances in aloe vera-based hydrogels for wound healing, including synthesis methods, structural characteristics, properties, and mechanisms of therapeutic agent release. It also highlights the therapeutic effects of aloe vera-based hydrogels on wound healing and their potential for improving outcomes.
Article
Polymer Science
Diana Pelinescu, Mihai Anastasescu, Veronica Bratan, Valentin-Adrian Maraloiu, Catalin Negrila, Daiana Mitrea, Jose Calderon-Moreno, Silviu Preda, Ioana Catalina Gifu, Adrian Stan, Robertina Ionescu, Ileana Stoica, Crina Anastasescu, Maria Zaharescu, Ioan Balint
Summary: Nanostructured oxides (SiO2, TiO2) were synthesized using the sol-gel method and modified with noble metal nanoparticles (Pt, Au) and ruthenium dye to enhance light harvesting and promote the photogeneration of reactive oxygen species. The resulting nanostructures were embedded in a transparent polyvinyl alcohol (PVA) hydrogel. The engineered materials were evaluated for their ability to generate reactive oxygen species (ROS) and showed potential for biomedical applications.
Article
Chemistry, Multidisciplinary
Ana -Maria Popescu, Jose M. Calderon-Moreno, Kazimir Yanushkevish, Alexei Aplevich, Olga Demidenko, Elena Ionela Neacsu, Virgil Constantin
Summary: Sintered NdFeB magnets have excellent magnetic properties but are susceptible to corrosion in acidic environments, while behaving passively in alkaline and saline media. The corrosion behavior of NdFeB magnets in industrial environments was studied using immersion and electrochemical tests. The results showed that the most corrosive electrolyte was HClO4, and the NdFeB sample without magnetic order exhibited better corrosion resistance. Metallographic microscopy and scanning electron microscopy supported the corrosion data, and X-ray photoelectron spectroscopy revealed the oxidation of the main elements (Nd, Fe, B) on the surface of the corroded sample.
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
(2023)