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
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
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
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
Biochemistry & Molecular Biology
Perumal Karthikeyan, Sankaran Meenakshi
Summary: A novel and environmentally-friendly chitosan encapsulated magnetic kaolin beads were fabricated and applied for the adsorption of phosphate and nitrate ions from water in this study. The synthesized beads showed promising potential as selective and effective adsorbents for the removal of phosphate and nitrate ions from aqueous solutions.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Water Resources
Roya Askari, Faezeh Mohammadi, Amir Moharrami, Shirin Afshin, Yousef Rashtbari, Mehdi Vosoughi, Abdollah Dargahi
Summary: The potential of activated carbon made from cherry tree wood (CWAC) in the adsorption of cationic red 14 dye was investigated in this study. The removal efficiency was assessed by considering the changes in pH, concentration, adsorbent dose, contact time, and temperature. Results showed that the efficiency of the process increased with higher contact times, temperatures, and pH, and decreased with higher initial dye concentrations. Langmuir isotherm and pseudo-second-order (PSO) kinetic models were found to best describe the observed data.
APPLIED WATER SCIENCE
(2023)
Article
Energy & Fuels
Ehab S. Ali, Ahmed A. Askalany, K. Harby, Mohamed Refaat Diab, Bahgat R. M. Hussein, Ahmed S. Alsaman
Summary: This study experimentally expressed the benefits of using acid activated montmorillonite as a new adsorbent material in adsorption desalination-cooling systems. The results showed efficient adsorption characteristics and significant salt removal capabilities of acid activated montmorillonite.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Applied
Najeeb Ur Rahman, Wasim Bahadar, Sultan Alam, Muhammad Zahoor, Ivar Zekker, Farhat Ali Khan, Riaz Ullah, Essam A. Ali, H. C. Ananda Murthy
Summary: This study investigates the use of chemically modified sawdust from paper mulberry as an adsorbent for removing basic blue 3 and methylene green from water. The adsorption capacity and the effects of adsorbent dosage and temperature were evaluated. The results showed that the pseudosecond-order model provided the best fit for the kinetic data, while the Langmuir model was most suitable for explaining the isothermal data. The prepared adsorbent exhibited promising adsorption capacity and could be used for reclaiming water contaminated with other pollutants.
ADSORPTION SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Nor Adilla Rashidi, Awais Bokhari, Suzana Yusup
Summary: The kinetic analysis showed that the rate of CO2 adsorption of both activated carbons increased with temperature, indicating higher mobility of CO2 adsorbates at elevated temperatures. However, the adsorption capacity of both activated carbons decreased at higher temperatures, suggesting exothermic and physisorption behavior. The pseudo-second-order kinetics model provided a better fit for CO2 adsorption, with a coefficient of determination (R-2) close to unity, regardless of the adsorption temperature.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
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
Engineering, Environmental
Chunlian Hu, Wei Zhang, Yuantao Chen, Na Ye, DaWa YangJi, Haizhe Jia, Yanting Shen, Minna Song
Summary: The carboxylated sludge biochar (CSB) modified by HNO3 showed improved adsorption capacity for the removal of cobalt, making it a promising adsorbent for wastewater treatment.
WATER SCIENCE AND TECHNOLOGY
(2021)
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
Biochemistry & Molecular Biology
Panuwat Lawtae, Chaiyot Tangsathitkulchai
Summary: Mesoporous activated carbon produced from longan seed biomass through CO2 physical activation showed superior adsorption kinetics and capacity in removing methylene blue, with high specific surface area and pore volume. Regardless of the initial pH, the mesoporous carbon achieved a maximum adsorption capacity of 1000 mg/g.
Article
Chemistry, Multidisciplinary
Jiyun Kim, Woong Kwon, Byong Chol Bai, Euigyung Jeong
Summary: This study investigates the preparation of activated carbon fiber derived from waste cotton fabric for economical and eco-friendly recycling as well as its application to water purification. The activated carbon fiber was prepared by physical activation using steam and its adsorption property was evaluated using methylene blue. The findings suggest that activating the carbon fiber at higher temperatures leads to increased specific surface area and mesopore volume, resulting in enhanced adsorption of methylene blue. The Langmuir equation was found to be more suitable for describing the adsorption equilibrium. Additionally, the kinetics of methylene blue adsorption varied with different activation temperatures.
Article
Energy & Fuels
Rene Blaise Ngouateu Lekene, Naphtali Odogu Ankoro, Daouda Kouotou, Gervais Blondel Ndiffo Yemeli, Serge Arnorld Benedoue, Juluis Ndi Nsami, Joseph Ketcha Mbadkam
Summary: In this study, activated carbon (AC), chitosan (CH), and biocomposite activated carbon/chitosan (AC/CH) were successfully prepared and characterized. The results showed that the biocomposite AC/CH exhibited better nitrate ion removal compared to AC, with an equilibrium time of 20 min, an optimal pH of 3, and an adsorption capacity of 58 mg/g at an initial concentration of 200 mg/L. The biocomposite was also found to be reusable after multiple adsorption/desorption cycles.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
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
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
Biochemistry & Molecular Biology
Liliana Giraldo, Fernando Gomez-Granados, Juan Carlos Moreno-Pirajan
Summary: This research immobilizes CALB on MOF-199 and ZIF-8 and uses them in the transesterification reaction for biodiesel production. The highest adsorption capacity of 26.9 mg•g-1 Lipase is achieved using ZIF-8 at 45°C and an initial protein concentration of 1.20 mg•mL-1. CALB is physically adsorbed on ZIF-8 and chemically adsorbed on MOF-199. Kinetic studies show that the adsorption kinetics follow the Elovich model for both biocatalysts.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
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.
Article
Chemistry, Multidisciplinary
Yaned Milena Correa-Navarro, Gerson-Dirceu Lopez, Chiara Carazzone, Liliana Giraldo, Juan Carlos Moreno-Pirajan
Summary: A new method for degrading persistent pollutants using mechanochemical treatment is studied. By treating biochar and aluminum mixtures with high-energy ball milling, caffeine and diclofenac were successfully degraded and transformation products were identified. This method shows potential application in the environmental management of emerging contaminants.
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
Biochemistry & Molecular Biology
Juan Matos, Claudia P. Amezquita-Marroquin, Johan D. Lozano, Jhon Zapata-Rivera, Liliana Giraldo, Po S. Poon, Juan C. Moreno-Pirajan
Summary: Nanoporous carbons were prepared from mangosteen-peel-derived chars via chemical and physical activation. The bifunctionality of the N groups was utilized to study the removal of atrazine. Various kinetic models and adsorption isotherms were analyzed. The results were compared with commercially activated carbons and the role of surface functional groups in atrazine removal was estimated. This study contributes to the understanding of the interactions between triazine-based pollutants and nanoporous carbons in the liquid-solid interface.
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)
