keyword
https://read.qxmd.com/read/38440276/scalable-synthesis-of-high-quality-reduced-graphene-oxide-with-a-large-c-o-ratio-and-its-dispersion-in-a-chemically-modified-polyimide-matrix-for-electromagnetic-interference-shielding-applications
#21
JOURNAL ARTICLE
Zahid Mehmood, Syed Aizaz Ali Shah, Saeed Omer, Ramsha Idrees, Shaukat Saeed
High-purity reduced graphene oxide (RGO or rGO) with appreciable conductivity is a desired conductive filler for lightweight polymer composites used in coatings, electronics, catalysts, electromagnetic interference (EMI) shielding, and energy storage devices. However, the intrinsic conductivity and the uniform dispersion of RGO in relatively polar matrices are challenging, leading to poor overall conductivity and performance of the composite material. The reported study improved the RGO intrinsic conductivity by increasing its C/O ratio while also simultaneously enhancing its compatibility with the polyimide (PI) matrix through ester linkages for better dispersion...
February 29, 2024: RSC Advances
https://read.qxmd.com/read/38423146/microplastics-role-in-cell-migration-and-distribution-during-cancer-cell-division
#22
JOURNAL ARTICLE
Ekaterina Brynzak-Schreiber, Elisabeth Schögl, Carolin Bapp, Klaudia Cseh, Verena Kopatz, Michael A Jakupec, Andreas Weber, Tobias Lange, José L Toca-Herrera, Giorgia Del Favero, Wolfgang Wadsak, Lukas Kenner, Verena Pichler
Amidst the global plastic pollution crisis, the gastrointestinal tract serves as the primary entry point for daily exposure to micro- and nanoplastics. We investigated the complex dynamics between polystyrene micro- and nanoplastics (PS-MNPs) and four distinct human colorectal cancer cell lines (HT29, HCT116, SW480, and SW620). Our findings revealed a significant size- and concentration dependent uptake of 0.25, 1, and 10 μm PS-MNPs across all cell lines, with HCT116 cells exhibiting the highest uptake rates...
February 27, 2024: Chemosphere
https://read.qxmd.com/read/38405503/3d-cobalt-dicyanamide-derived-2d-layered-co-oh-2-based-catalyst-for-light-driven-hydrogen-evolution
#23
JOURNAL ARTICLE
Sina Sadigh Akbari, Ferdi Karadas
Derivation of 3D coordination polymers to produce active catalysts has been a feasible strategy to achieve a precise coordination sphere for the catalytic site. This study demonstrates the partial conversion of a 3D cobalt dicyanamide coordination polymer, Co-dca, to a 2D layered hydroxide-oxyhydroxide structure under photocatalytic conditions. The catalyst exhibits an activity as high as 28.3 mmol h-1 g-1 in the presence of a [Ru(bpy)3 ]2+ /triethylamine (TEA) couple to maintain it for at least 12 h. Photocatalytic and characterization studies reveal that the dicyanamide ligand within the coordination polymer is crucial for governing modification and achieving a superior H2 evolution rate...
February 20, 2024: ACS Omega
https://read.qxmd.com/read/38403122/piezoelectric-catalytic-driven-advanced-oxidation-process-using-two-dimensional-metal-dichalcogenides-for-wastewater-pollutants-remediation
#24
REVIEW
Win Thi Yein, Qun Wang, Dong-Su Kim
The public and society have increasingly recognized numerous grave environmental issues, including water pollution, attributed to the rapid expansion of industrialization and agriculture. Renewable energy-driven catalytic advanced oxidation processes (AOPs) represent a green, sustainable, and environmentally friendly approach to meet the demands of environmental remediation. In this context, 2D transition metal dichalcogenides (TMDCs) piezoelectric materials, with their non-centrosymmetric crystal structure, exhibit unique features...
February 23, 2024: Chemosphere
https://read.qxmd.com/read/38398638/chemical-vapor-deposition-synthesized-two-dimensional-non-stoichiometric-copper-selenide-%C3%AE-cu-2-x-se-for-ultra-fast-tetracycline-hydrochloride-degradation-under-solar-light
#25
JOURNAL ARTICLE
Srijith, Rajashree Konar, Eti Teblum, Vivek Kumar Singh, Madina Telkhozhayeva, Michelangelo Paiardi, Gilbert Daniel Nessim
The high concentration of antibiotics in aquatic environments is a serious environmental issue. In response, researchers have explored photocatalytic degradation as a potential solution. Through chemical vapor deposition (CVD), we synthesized copper selenide (β-Cu2-x Se) and found it an effective catalyst for degrading tetracycline hydrochloride (TC-HCl). The catalyst demonstrated an impressive degradation efficiency of approximately 98% and a reaction rate constant of 3.14 × 10-2 min-1 . Its layered structure, which exposes reactive sites, contributes to excellent stability, interfacial charge transfer efficiency, and visible light absorption capacity...
February 17, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38398563/use-of-novel-homochiral-thioureas-camphor-derived-as-asymmetric-organocatalysts-in-the-stereoselective-formation-of-glycosidic-bonds
#26
JOURNAL ARTICLE
Mildred López, Gabriela Huelgas, Mario Sánchez, Adalid Armenta, Angel Mendoza, José Daniel Lozada-Ramírez, Cecilia Anaya de Parrodi
We synthesized six new camphor-derived homochiral thioureas 1 - 6 , from commercially available (1 R )-(-)-camphorquinone. These new compounds 1 - 6 were evaluated as asymmetric organocatalysts in the stereoselective formation of glycosidic bonds, with 2,3,4,6-tetra- O -benzyl-D-glucopyranosyl and 2,3,4,6-tetra- O -benzyl-D-galactopyranosyl trichloroacetimidates as donors, and several alcohols as glycosyl acceptors, such as methanol, ethanol, 1-propanol, 1-butanol, 1-octanol, iso -propanol, tert -butanol, cyclohexanol, phenol, 1-naphtol, and 2-naphtol...
February 9, 2024: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://read.qxmd.com/read/38394780/dipole-effect-on-oxygen-evolution-reaction-of-2d-janus-single-atom-catalysts-a-case-of-rh-anchored-on-the-p-6-m-2-np-configurations
#27
JOURNAL ARTICLE
Tao Huang, Zi-Xuan Yang, Lei Li, Hui Wan, Can Leng, Gui-Fang Huang, Wangyu Hu, Wei-Qing Huang
Catalytic performance of single-atom catalysts (SACs) relies fundamentally on the electronic nature and local coordination environment of the active site. Here, based on a machine-learning (ML)-aided density functional theory (DFT) method, we reveal that the intrinsic dipole in Janus materials has a significant impact on the catalytic activity of SACs, using 2D γ-phosphorus carbide (γ-PC) as a model system. Specifically, a local dipole around the active site is a key degree to tune the catalytic activity and can be used as an important descriptor with a high feature importance of 17...
February 23, 2024: Journal of Physical Chemistry Letters
https://read.qxmd.com/read/38393646/readily-available-ti-based-in-situ-catalytic-system-for-oxo-imido-heterometathesis
#28
JOURNAL ARTICLE
Andrey V Rumyantsev, Nikolai S Bushkov, Margarita A Ryzhikova, Anton A Zhizhin, Rina U Takazova, Valeria N Talanova, Evgenii I Gutsul, Roman A Novikov, Pavel A Zhizhko, Dmitry N Zarubin
We investigate Ti(NEt2 )4 supported on silica dehydroxylated at 700 °C as an easily accessible pre-catalyst for oxo/imido heterometathesis reactions. Being activated with TolNH2 , the supported Ti amide (SiO)Ti(NEt2 )3 (1) demonstrates catalytic activity in the imidation of ketones with N -sulfinylamines comparable with the most active previously described well-defined imido catalyst (SiO)Ti(N t Bu)(Me2 Pyr)(py)2 (2) (Me2 Pyr = 2,5-dimethylpyrrolyl), which implies the in situ formation of surface imido species in this system...
February 23, 2024: Dalton Transactions: An International Journal of Inorganic Chemistry
https://read.qxmd.com/read/38391270/a-dft-study-of-co-2-electroreduction-catalyzed-by-hexagonal-boron-nitride-nanosheets-with-vacancy-defects
#29
JOURNAL ARTICLE
Dušan N Sredojević, Ivana Vukoje, Đorđe Trpkov, Edward N Brothers
In addition to providing a sustainable route to green alternative energy and chemical supplies from a cheap and abundant carbon source, recycling CO2 offers an excellent way to reduce net anthropogenic global CO2 emissions. This can be achieved via catalysis on 2D materials. These materials are atomically thin and have unique electrical and catalytic properties compared to bigger nanoparticles and conventional bulk catalysts, opening a new arena in catalysis. This paper examines the efficacy of hexagonal boron nitride (h-BN) lattices with vacancy defects for CO2 electroreduction (CO2 RR)...
February 23, 2024: Physical Chemistry Chemical Physics: PCCP
https://read.qxmd.com/read/38385824/subtle-2d-2d-mxene-based-heterostructures-for-high-performance-electrocatalytic-water-splitting
#30
REVIEW
Jiaqi Wang, Ganceng Yang, Yanqing Jiao, Haijing Yan, Honggang Fu
Developing efficient electrocatalysts is significant for the commercial application of electrocatalytic water splitting. 2D materials have presented great prospects in electrocatalysis for their high surface-to-volume ratio and tunable electronic properties. Particularly, MXene emerges as one of the most promising candidates for electrocatalysts, exhibiting unique advantages of hydrophilicity, outstanding conductivity, and exceptional stability. However, it suffers from lacking catalytic active sites, poor oxidation resistance, and easy stacking, leading to a significant suppression of the catalytic performance...
February 22, 2024: Small Methods
https://read.qxmd.com/read/38377912/2d-2d-heterojunctions-for-rapid-and-self-cleaning-removal-of-antibiotics-via-visible-light-assisted-peroxymonosulfate-activation-efficiency-synergistic-effects-and-applications
#31
JOURNAL ARTICLE
Bin-Bin Zhang, Chang-Wei Bai, Xin-Jia Chen, Yi-Jiao Sun, Qi Yang, Fei Chen
Developing eco-friendly and efficient technologies for treating antibiotic wastewater is crucial. Traditional methods face challenges in incomplete removal, high costs, and secondary pollution. Heterogeneous peroxymonosulfate (PMS) activation assisted by visible light shows promise, but suitable activators remain a huge challenge. Here, we synthesized cost-effective carbon nitride/bismuth bromide oxide (CN/BiOBr) heterojunctions. Such a heterojunction achieved rapid PMS activation, achieving over 90.00% tetracycline (TC) removal only within 1 min (kobs of 2...
February 17, 2024: Journal of Hazardous Materials
https://read.qxmd.com/read/38376726/recent-advances-in-mechanistic-understanding-of-metal-free-carbon-thermocatalysis-and-electrocatalysis-with-model-molecules
#32
REVIEW
Wei Guo, Linhui Yu, Ling Tang, Yan Wan, Yangming Lin
Metal-free carbon, as the most representative heterogeneous metal-free catalysts, have received considerable interests in electro- and thermo-catalytic reactions due to their impressive performance and sustainability. Over the past decade, well-designed carbon catalysts with tunable structures and heteroatom groups coupled with various characterization techniques have proposed numerous reaction mechanisms. However, active sites, key intermediate species, precise structure-activity relationships and dynamic evolution processes of carbon catalysts are still rife with controversies due to the monotony and limitation of used experimental methods...
February 20, 2024: Nano-Micro Letters
https://read.qxmd.com/read/38375310/a-comparison-between-2d-and-3d-cobalt-organic-framework-as-catalysts-for-electrochemical-co-2-reduction
#33
JOURNAL ARTICLE
Neda Sadat Barekati, Hossein Farsi, Alireza Farrokhi, Shokufeh Moghiminia
Electrocatalytic CO2 reduction, as an effective way to reduce the CO2 concentration, has gained attention. In this study, we prepared ZIF-67 nanoparticles and nanosheets and investigated them as electrocatalysts for CO2 reduction. It was found that ZIF-67 nanosheets, because of their two-dimensional morphologies, provide more under-coordinated cobalt nodes and have lower overpotentials for both hydrogen evolution and CO2 reduction reactions. Also, the rate-determining step for hydrogen evolution changes from Volmer for ZIF-67 nanoparticles to Hyrovsky for ZIF-67 nanosheets...
February 29, 2024: Heliyon
https://read.qxmd.com/read/38368250/rational-construction-of-3d-self-supported-mof-derived-cobalt-phosphide-based-hollow-nanowall-arrays-for-efficient-overall-water-splitting-at-large-current-density
#34
JOURNAL ARTICLE
Dezhi Kong, Qingguo Xu, Ningning Chu, Hui Wang, Yew Von Lim, Jinbing Cheng, Shaozhuan Huang, Tingting Xu, Xinjian Li, Ye Wang, Yongsong Luo, Hui Ying Yang
Developing efficient nonprecious bifunctional electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) in the same electrolyte with a low overpotential and large current density presents an appealing yet challenging goal for large-scale water electrolysis. Herein, a unique 3D self-branched hierarchical nanostructure composed of ultra-small cobalt phosphide (CoP) nanoparticles embedded into N, P-codoped carbon nanotubes knitted hollow nanowall arrays (CoPʘNPCNTs HNWAs) on carbon textiles (CTs) through a carbonization-phosphatization process is presented...
February 17, 2024: Small
https://read.qxmd.com/read/38367256/general-pyrolysis-for-high-loading-transition-metal-single-atoms-on-2d-nitro-oxygeneous-carbon-as-efficient-orr-electrocatalysts
#35
JOURNAL ARTICLE
Teera Butburee, Jitprabhat Ponchai, Pongtanawat Khemthong, Poobodin Mano, Pongkarn Chakthranont, Saran Youngjan, Jakkapop Phanthasri, Supawadee Namuangruk, Kajornsak Faungnawakij, Xingya Wang, Yu Chen, Lijuan Zhang
Single-atom catalysts (SACs) possess the potential to involve the merits of both homogeneous and heterogeneous catalysts altogether and thus have gained considerable attention. However, the large-scale synthesis of SACs with rich isolate-metal sites by simple and low-cost strategies has remained challenging. In this work, we report a facile one-step pyrolysis that automatically produces SACs with high metal loading (5.2-15.9 wt %) supported on two-dimensional nitro-oxygenated carbon (M1 -2D-NOC) without using any solvents and sacrificial templates...
February 17, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38363186/revolutionizing-airborne-virus-defense-electromagnetic-mxene-coated-air-filtration-for-superior-aerosol-viral-removal
#36
JOURNAL ARTICLE
Fangzhou Liu, Qingquan Ma, Md Mohidul Alam Sabuj, Shih-Hsiang Yen, Dheeban Govindan, Jianan Gao, Mengqiang Zhao, Menachem Elimelech, Wen Zhang
The COVID-19 pandemic sparked public health concerns about the transmission of airborne viruses. Current methods mainly capture pathogens without inactivation, leading to potential secondary pollution. Herein, we evaluated the inactivation performance of a model viral species (MS2) in simulated bioaerosol by an electromagnetically enhanced air filtration system under a 300 kHz electromagnetic induction field. A nonwoven fabric filter was coated with a 2D catalyst, MXene (Ti3 C2 T x ), at a coating density of 4...
February 16, 2024: ACS Applied Materials & Interfaces
https://read.qxmd.com/read/38361226/single-transition-metal-atom-anchored-on-a-rhenium-disulfide-monolayer-an-efficient-bifunctional-electrocatalyst-for-the-oxygen-evolution-and-oxygen-reduction-reactions
#37
JOURNAL ARTICLE
Meiling Pan, Xiuhua Cui, Qun Jing, Haiming Duan, Fangping Ouyang, Rong Wu
Developing efficient oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) bifunctional electrocatalysts is attractive for rechargeable metal-air batteries. Meanwhile, single metal atoms embedded in 2D layered transition metal chalcogenides (TMDs) have become a very promising catalyst. Recently, many attentions have been paid to the 2D ReS2 electrocatalyst due to its unique distorted octahedral 1T' crystal structure and thickness-independent electronic properties. Here, the catalytic activity of different transition metal (TM) atoms embedded in ReS2 using the density functional theory is investigated...
February 15, 2024: Small
https://read.qxmd.com/read/38361184/all-inorganic-perovskite-nitio-3-cs-3-sb-2-i-9-heterostructure-for-photocatalytic-co-2-reduction-to-ch-4-with-high-selectivity
#38
JOURNAL ARTICLE
Shuhan Fan, Qu Yang, Guilin Yin, Xiaosi Qi, Yuyu Feng, Junfei Ding, Qiong Peng, Yunpeng Qu, Qinglong Wang, Yan Shen, Mingkui Wang, Xiu Gong
Developing efficient and stable halide perovskite-based photocatalysts for highly selectivity reduction CO2 to valuable fuels remains a significant challenge due to their intrinsic instability. Herein, a novel heterostructure featuring 2D Cs3 Sb2 I9 nanosheets on a 3D flower-like mesoporous NiTiO3 framework using a top-down stepwise membrane fabrication technique is constructed. The unique bilayer heterostructure formed on the 3D mesoporous framework endowed NiTiO3 /Cs3 Sb2 I9 with sufficient and close interface contact, minimizing charge transport distance, and effectively promoting the charge transfer at the interface, thus improving the reaction efficiency of the catalyst surface...
February 15, 2024: Small
https://read.qxmd.com/read/38351480/2d-ruthenium-chromium-oxide-with-rich-grain-boundaries-boosts-acidic-oxygen-evolution-reaction-kinetics
#39
JOURNAL ARTICLE
Xuhao Zhao, Zijian Li, Haeseong Jang, Xiaoqian Wei, Liu Wang, Min Gyu Kim, Jaephil Cho, Xien Liu, Qing Qin
Ruthenium oxide is currently considered as the promising alternative to Ir-based catalysts employed for proton exchange membrane water electrolyzers but still faces the bottlenecks of limited durability and slow kinetics. Herein, a 2D amorphous/crystalline heterophase ac-Cr0.53 Ru0.47 O2-δ substitutional solid solution with pervasive grain boundaries (GBs) is developed to accelerate the kinetics of acidic oxygen evolution reaction (OER) and extend the long-term stability simultaneously. The ac-Cr0.53 Ru0...
February 13, 2024: Small
https://read.qxmd.com/read/38347766/two-dimensional-materials-as-catalysts-interfaces-and-electrodes-for-an-efficient-hydrogen-evolution-reaction
#40
REVIEW
Yun Seong Cho, Joohoon Kang
Two-dimensional (2D) materials have been significantly investigated as electrocatalysts for the hydrogen evolution reaction (HER) over the past few decades due to their excellent electrocatalytic properties and their structural uniqueness including the atomically thin structure and abundant active sites. Recently, 2D materials with various electronic properties have not only been used as active catalytic materials, but also employed in other components of the HER electrodes including a conductive electrode layer and an interfacial layer to maximize the HER efficiency or utilized as templates for catalytic nanostructure growth...
February 13, 2024: Nanoscale
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