Article
Chemistry, Multidisciplinary
Yun Du, Chenglong Sun, Yuru Shen, Luyao Liu, Mingjian Chen, Qingji Xie, Hongbo Xiao
Summary: A novel electrode for sensitive analysis of As(III) was prepared, by cast-coating multiwalled carbon nanotubes on a glassy carbon electrode, enabling stable loading of gold nanoparticles and gold staining for efficient detection of As(III) through linear sweep anodic stripping voltammetry.
Article
Chemistry, Analytical
Vesna Antunovic, Tatjana Tripkovic, Biljana Tomasevic, Rada Baosic, Dijana Jelic, Aleksandar Lolic
Summary: This study utilized a Nafion-modified glassy carbon electrode and MnCo2O4 nanoparticles for the determination of Pb and Cu in anodic stripping voltammetry. The modified electrode showed enhanced sensitivity compared to the bare electrode, enabling successful detection of Pb and Cu in wine samples.
ANALYTICAL SCIENCES
(2021)
Article
Chemistry, Analytical
Mohammad Reza Jalali Sarvestani, Tayyebeh Madrakian, Abbas Afkhami
Summary: In this study, a highly sensitive electrochemical sensor was developed for the detection of ultra-trace levels of Pb2+. The sensor was modified with an in-situ electroplated bismuth film and a nanocomposite of a recently synthesized melamine based covalent organic framework and Fe3O4 nanoparticles. The combination of Fe3O4@SNW1 and the bismuth film significantly enhanced the sensitivity of the sensor towards Pb2+. The optimized sensor showed a linear response in the concentration range of 0.003-0.3 μmol L-1 with a detection limit of 0.95 nmol L-1. The sensor demonstrated good selectivity towards Pb2+ and was successfully applied for the determination of Pb2+ in different edible specimens.
Article
Chemistry, Analytical
Carlos H. S. Mendes, Maycom W. F. Silva, Severino Carlos B. Oliveira
Summary: The electrochemical oxidation of 5-methylcytosine was studied at glassy carbon electrode in aqueous solution, revealing a single, irreversible reaction step controlled by diffusion, generating intermediate radicals. C5 methylated pyrimidines are more easily oxidized and reactive compared to unmethylated bases. A new electroanalytical method using differential pulse voltammetry for quantification of DNA methylation was proposed, showing promising results for detection of 5-mCyt.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Xin Cai, Rui-Ze Xia, Jia-Jia Ye, Cong-Cong Huang, Yuan-Fan Yang, Long-Ke Zhang, Bo Liang, Meng Yang, Chu-Hong Lin, Pei-Hua Li, Xing-Jiu Huang
Summary: A practical strategy for detecting trace-level As(III) in natural water without any modifiers using soluble Fe3+ as a trigger is reported. The method achieves an actual detection limit of 1 ppb and a sensitivity of 0.296 mu A ppb(-1) with excellent stability. The codeposition mechanism of Fe3+ preferentially depositing as Fe-0 is confirmed, which facilitates the adsorption of As(III) and H+ on the electrode surface and the formation of AsH3.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Martijn Eikelboom, Yaxuan Wang, Gemma Portlock, Arthur Gourain, Joseph Gardner, Jay Bullen, Paul Lewtas, Matthieu Carriere, Alexandra Alvarez, Arun Kumar, Shane O'Prey, Tamas Tolgyes, Dario Omanovic, Subhamoy Bhowmick, Dominik Weiss, Pascal Salaun
Summary: The voltammetric determination of total inorganic arsenic in near-neutral pH conditions using a new commercially available 25 μm diameter gold microwire was presented. The method has better analytical parameters than previous methods and is easier to implement, enabling cheaper groundwater surveying campaigns with in-the-field analysis for quick data reporting, even in remote communities.
ANALYTICA CHIMICA ACTA
(2023)
Article
Electrochemistry
Domen Obrez, Mitja Kolar, Nikola Tasic, Samo B. Hocevar
Summary: Copper electrodes have interesting characteristics for electrochemical stripping analysis and can be an alternative to mercury electrodes. Different types of copper-based electrodes were studied for the detection of trace metal ions. Most of the copper electrodes showed favorable performances for stripping voltammetry.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Analytical
Iulia Gabriela David, Alexandra-Gabriela Oancea, Mihaela Buleandra, Dana Elena Popa, Emilia Elena Iorgulescu, Adela Magdalena Ciobanu
Summary: Diosmin is a naturally occurring flavonoid that can be quantified through a disposable pencil graphite electrode. The oxidative process involves two irreversible steps.
Article
Electrochemistry
Nelia A. Sanga, Nazeem Jahed, Zandile Leve, Emmanuel I. Iwuoha, Keagan Pokpas
Summary: This study developed a novel method for simultaneous detection of Cd2+, Cu2+, Pb2+, and Zn2+ concentrations using electrochemically reduced graphene oxide (ERGO) sheets in combination with low-cost disposable pencil graphite rods and in situ plated thin mercury films (HgF). The technique showed improved sensitivity and negligible intermetallic interferences, and was successfully applied to trace metal determination in tap water.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Chemistry, Analytical
Joseany M. S. Almeida, Ana Beatriz P. Ribeiro, Carlos A. T. Toloza, Ismael C. B. Alves, Jose Ribamar N. Santos, Lorena C. M. De Azevedo, Ricardo Q. Aucelio, Aldalea L. B. Marques
Summary: The study utilized SWAdSV to quantitate iron in ethanol and biodiesel using BiFE electrode to promote reduction of PAN-complexed Fe (III). Ni (II) was identified as a significant interference, with Cu (II), Al (III), Mn (II), Cr (III), Cd (II), Zn (II), and Pb (II) showing no significant interference under experimental conditions.
ANALYTICAL LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Shabnam Allahverdiyeva, Pinar Talay Pinar, Yavuz Yardim, Zuhre Senturk
Summary: This study describes the electrochemical investigation and voltammetric determination of the HIV integrase inhibitor dolutegravir for the first time. Results showed that using cathodically pretreated boron-doped diamond electrode, a linear detection of dolutegravir can be achieved under suitable conditions.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Chemistry, Analytical
Natalia Festinger, Sylwia Smarzewska, Valentin Mirceski, Witold Ciesielski
Summary: A simple and sensitive square wave voltammetric procedure was developed for the determination of acemetacin (ACM) at graphite flake paste electrode (GFPE) and glassy carbon electrode (GCE). The method showed wide linear range for ACM concentration and was successfully applied for ACM determination in pharmaceuticals and spiked urine with satisfying recoveries. The electrochemical oxidation of ACM was found to be an irreversible process controlled by mixed nature of the mass transfer process.
Article
Polymer Science
Mengmeng Zhao, Ying Ma, Xianhui Zhang, Liang Wang, Guangqian Zhu, Qinggang Wang
Summary: Iron complexes with different pyridine-oxime ligands were synthesized and characterized. The crystal structure of one complex was determined, demonstrating the coordination mode of the pyridine-oxime ligands. The complexes showed high catalytic activity in the polymerization of isoprene.
Article
Chemistry, Analytical
Alexandra Karapa, Christos Kokkinos, Peter R. Fielden, Sara J. Baldock, Nickolas J. Goddard, Anastasios Economou
Summary: This paper reports the development of a portable system using anodic stripping voltammetry (ASV) for the determination of trace As(III) in water samples. The portable system consists of a three-electrode mini cell with plastic conductive electrodes. The accumulation of As(III) on the disposable working electrode and its subsequent detection by anodic potential scan were studied. The limit of detection was 0.2 μg L-1 and the repeatability at the 5.0 μg L-1 As(III) level was 4.7% (n = 10). The portable setup was successfully applied to analyze different groundwater samples with recoveries between 95% and 105%.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Analytical
Elham Oveili, Shohreh Jahani, Omid Tayari, Abbas Jahanara, Zohreh Fazli, Zahra Aramesh-Boroujeni, Soroush Rashidi, Nadia Rezaei Zade Baravati, Mohammad Mehdi Foroughi
Summary: In this study, a new cocaine sensor using a simple hydrothermal protocol to fabricate octahedral palladium-doped cobaltite composite (Oh-Pd2+ : Co3O4-C) was developed. Various methods were employed to validate the fabricated cocaine sensing approach. Energy dispersive X-ray analysis, X-ray diffraction, and scanning electron microscopy were used to characterize the charged modified composite. The electrode showed high sensitivity in detecting cocaine, with a wide linear range (0.01 mu M-900.0 mu M) and a low detection limit (1.3 nM). Quantitative determination of cocaine in biological samples was successfully achieved using the modified electrode, yielding promising results.
Article
Chemistry, Physical
Abi M. Taddesse, Tigabu Bekele, Isabel Diaz, Abebaw Adgo
Summary: By synthesizing ternary composites with different ratios, the photocatalytic activity of CdS/CeO2/Ag3PO4 was found to be higher, with optimum operational parameters including pH 4, initial dye concentration of 10 ppm, and photocatalyst load of 0.15 g/L. Reactive oxygen species and hydroxyl radicals play major roles in the degradation of MeO dye.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2021)
Article
Chemistry, Applied
Yaregal Awoke, Yonas Chebude, Isabel Diaz
Summary: The aim of this study is to obtain Ti-containing Periodic Mesoporous Organosilica (PMO) materials with catalytic activity in epoxidation reactions. The Ti-PMO materials possess ordered 2-dimensional hexagonal mesostructures, high surface areas, uniform pore sizes, large pore volumes, and tetrahedrally incorporated Ti(IV) species on the surface of the pore walls. The catalytic activities of these materials were tested in the epoxidation of cyclohexene and vernonia oil, showing good conversion rates and selectivity.
Article
Chemistry, Applied
M. Asuncion Molina, Nejat Redwan Habib, Isabel Diaz, Manuel Sanchez-Sanchez
Summary: Metal-Organic Frameworks (MOFs) are widely used in various applications, including heterogeneous catalysis. However, the limited diffusion of reactants and products is a common issue. This study improves the performance of nanocrystalline MOFs by introducing surfactant-induced mesoporosity, enabling the efficient removal of bisphenol A from aqueous solution.
Article
Chemistry, Applied
Nejat Redwan Habib, Raquel Sainz, Abi M. Taddesse, Isabel Diaz
Summary: This study attempted to assist the sustainable synthesis of MOFs using non-ionic surfactants in aqueous solutions at room temperature. NH2-MIL-53(Al) and MIL-100(Fe) exhibited preferential crystal growth along a certain direction, while UiO-66 type (Zr-BDC and NH2-Zr-BDC) MOFs showed no significant difference. However, the surfactant templated UiO-66 type Zr-MOFs had larger particles compared to their parent MOFs.
Article
Chemistry, Multidisciplinary
Ramon de la Serna, David Nieto, Raquel Sainz, Beatriz Bernardo-Maestro, Alvaro Mayoral, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Luis Gomez-Hortiguela
Summary: Scientists reported the discovery of a new type of chiral zeolite material, GTM-3, with extra-large pores. This material demonstrated excellent enantioselectivity and the ability to catalyze reactions with bulky substrates. The researchers achieved unprecedented product enantiomeric excesses of up to 30% by catalyzing the epoxide aperture of transstilbene oxide with alcohols. This discovery opens new possibilities for the catalytic asymmetric synthesis of chiral pharmaceutical compounds using chiral zeolite materials.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Mercedes Boronat, Maria J. Climent, Patricia Concepcion, Urbano Diaz, Hermenegildo Garcia, Sara Iborra, Antonio Leyva-Perez, Lichen Liu, Agustin Martinez, Cristina Martinez, Manuel Moliner, Joaquin Perez-Pariente, Fernando Rey, Enrique Sastre, Pedro Serna, Susana Valencia
Summary: This article introduces the significant contributions of Prof. Avelino Corma in the field of heterogeneous catalysis and materials science. It highlights his remarkable achievements in areas such as solid catalysts, materials synthesis, and photochemistry. The article also emphasizes the importance of the research methods and paradigms developed by Avelino and his team in addressing new scientific challenges in building a sustainable world.
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Applied
Ramon de la Serna, Joaquin Perez-Pariente, Luis Gomez-Hortigueela
Summary: In this study, the asymmetric catalytic activity of GTM-3 chiral zeolite in the ring-opening reaction of trans-stilbene oxide using alcohols as nucleophiles was systematically explored. The results showed that a proper chiral host-guest size match is crucial for the chiral manifestation of the zeolite catalyst. Additionally, secondary alcohols with larger size exhibited higher enantioselectivity than their linear counterparts. Furthermore, variation of reaction conditions, such as the concentration of the epoxide and reaction temperature, could greatly influence the enantioselectivity and selectivity of the reaction.
Article
Chemistry, Applied
Alejandro Vidal de la Fuente, Amel Mekki, Bouhadjar Boukoussa, Marisol Grande-Casas, Enrique Sastre, Carlos Marquez-Alvarez, Manuel Sanchez-Sanchez, Joaquin Perez-Pariente
Summary: In this study, large-pore zeolite omega was treated with CTA to generate intracrystalline mesoporosity. The samples were characterized and it was found that dealumination and mild acid leaching are necessary for the formation of narrow-pore-diameter mesopores. The presence of mesopores enhances catalytic activity but does not improve selectivity.
Article
Chemistry, Multidisciplinary
Ramon de la Serna, Itziar Arnaiz, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Luis Gomez-Hortiguela
Summary: The chirality of the -ITV zeolite framework undergoes a surprising inversion when the ethyl group of the enantiopure N,N-ethyl-methyl-pseudoephedrinium organic structure-directing agent is replaced by a benzyl or 2-methylbenzyl group. Interestingly, chiral zeolite materials obtained with these new benzyl-containing cations exhibit unprecedentedly high enantiomeric excesses up to 55%.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Eddy Dib, Beatriz Bernardo-Maestro, Fernando Lopez-Arbeloa, Joaquin Perez-Pariente, Luis Gomez-Hortiguela
Summary: In this study, high-resolution H-1 MAS NMR was used to distinguish between two aggregation states of (1R,2S)-ephedrine occluded within AFI-type microporous aluminophosphates. The investigation focused on the supramolecular assembly of ephedrine molecules and the distances between aromatic rings and their closest protons inside the zeolite channels. The combination of two-dimensional spin diffusion spectra, molecular simulations, and DFT calculations allowed for precise estimation of these distances.
DALTON TRANSACTIONS
(2022)
Review
Chemistry, Inorganic & Nuclear
Nejat Redwan Habib, Esther Asedegbega-Nieto, Abi M. Taddesse, Isabel Diaz
Summary: Transition metals play a crucial role in heterogeneous catalysis, with noble and precious metals being widely used in this field. While noble metals offer significant advantages, utilizing Earth abundant metals presents a sustainable alternative. Loading metals into highly porous materials, such as MOFs, can enhance catalytic reactions and overcome instability issues.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Sophia Mohammadnasabomran, Carlos Marquez-Alvarez, Joaquin Perez-Pariente, Agustin Martinez
Summary: Grafting aluminum onto SBA-15 improves Co dispersion and results in a more homogeneous distribution of metal species. However, the Al-grafted CoRu/Al-SBA-15 catalyst shows lower activity in Fischer-Tropsch synthesis compared to the all-silica CoRu/SBA-15 counterpart, but exhibits enhanced selectivity towards liquid hydrocarbons.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Teklewold Getachew, Fitsum Addis, Solomon Mehretie, Hin-Lap Yip, Ruidong Xia, Shimelis Admassie
Article
Chemistry, Physical
Teklewold Getachew, Solomon Mehretie, Hin-Lap Yip, Ruidong Xia, Shimelis Admassie
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
