scholarly journals Effect of CeO2 nanomaterial surface functional groups on tissue and subcellular distribution of Ce in tomato (Solanum lycopersicum)

2019 ◽  
Vol 6 (1) ◽  
pp. 273-285 ◽  
Author(s):  
Jieran Li ◽  
Ryan V. Tappero ◽  
Alvin S. Acerbo ◽  
Hanfei Yan ◽  
Yong Chu ◽  
...  
Keyword(s):  
Solanum Lycopersicum ◽  
Functional Groups ◽  
Subcellular Distribution ◽  
Surface Functional Groups ◽  
Tomato Plants ◽  
X Ray ◽  
Manufactured Nanomaterials ◽  
Recent Advances

Using recent advances in X-ray microscopy, this study aimed to elucidate mechanisms of uptake, subcellular distribution, and translocation of functionalized CeO2 MNM (manufactured nanomaterials), having different charges, by tomato plants (Solanum lycopersicum cv Micro-Tom).

scholarly journals Structural Characterization of Graphene Oxide: Surface Functional Groups and Fractionated Oxidative Debris

Nanomaterials ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 1180 ◽  
Author(s):  
Elvin Aliyev ◽  
Volkan Filiz ◽  
Muntazim M. Khan ◽  
Young Joo Lee ◽  
Clarissa Abetz ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Functional Groups ◽  
Structural Model ◽  
Oxide Surface ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
Surface Functional Groups ◽  
X Ray ◽  
Transmission Electron

The purpose of this work is the structural analysis of graphene oxide (GO) and by means of a new structural model to answer the questions arising from the Lerf–Klinowski and the Lee structural models. Surface functional groups of GO layers and the oxidative debris (OD) stacked on them were investigated after OD was extracted. Analysis was performed successfully using Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), X-ray photoemission spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDX), Raman spectroscopy, solid-state nuclear magnetic resonance spectroscopy (SSNMR), standardized Boehm potentiometric titration analysis, elemental analysis, X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The analysis showed that graphene oxide layers, as well as oxidative debris contain different functional groups such as phenolic –OH, ketone, lactone, carboxyl, quinone and epoxy. Based on these results, a new structural model for GO layers is proposed, which covers all spectroscopic data and explains the presence of the other oxygen functionalities besides carboxyl, phenolic –OH and epoxy groups.

scholarly journals Carbon Nanotubes Incorporated Z-Scheme Assembly of AgBr/TiO2 for Photocatalytic Hydrogen Production under Visible Light Irradiations

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1767 ◽  
Author(s):  
Nasir Shezad ◽  
Ibrahim M. Maafa ◽  
Khairiraihanna Johari ◽  
Ainy Hafeez ◽  
Parveen Akhter ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Visible Light ◽  
Functional Groups ◽  
H2 Production ◽  
Green Energy ◽  
Photoelectron Spectra ◽  
Surface Functional Groups ◽  
Electron Mediator ◽  
X Ray ◽  
Vis Spectroscopy

Photocatalytic H2 production is a promising strategy toward green energy and alternative to carbon-based fuels which are the root cause of global warming and pollution. In this study, carbon nanotubes (CNTs) incorporated Z-scheme assembly of AgBr/TiO2 was developed for photocatalytic H2 production under visible light irradiations. Synthesized photocatalysts were characterized through transmission electron microscope (TEM), X-ray photoelectron spectra (XPS), X-ray diffractometer (XRD), Fourier transform infrared (FTIR), photoluminescence spectra (PL), Brunauer Emmet-Teller(BET), and UV-vis spectroscopy analysis techniques. The composite photocatalysts exhibited a H2 production of 477 ppm which was three-folds higher than that produced by TiO2. The good performance was attributed to the strong interaction of three components and the reduced charge recombination, which was 89 and 56.3 times lower than the TiO2 and AgBr/TiO2. Furthermore, the role of surface acidic and basic groups was assessed and the photocatalytic results demonstrated the importance of surface functional groups. In addition, the composites exhibited stability and reusability for five consecutive cycles of reaction. Thus, improved performance of the photocatalyst was credited to the CNTs as an electron mediator, surface functional groups, higher surface area, enhanced charge separation and extended visible light absorption edge. This work provides new development of Z-scheme photocatalysts for sustainable H2 production.

scholarly journals Physicochemical Characterization of Cherry Pits-Derived Biochar

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 408
Author(s):  
Vladimír Frišták ◽  
Diana Bošanská ◽  
Martin Pipíška ◽  
Libor Ďuriška ◽  
Stephen M. Bell ◽  
...  
Keyword(s):  
Functional Groups ◽  
Material Characterization ◽  
Physicochemical Characterization ◽  
Exchange Capacity ◽  
Surface Functional Groups ◽  
X Ray ◽  
Surface Functionality ◽  
Boehm Titration ◽  
Pyrolysis Processes

Although the suitability of some biochars for contaminants’ sorption separation has been established, not all potential feedstocks have been explored and characterized. Here, we physicochemically characterized cherry pit biochar (CPB) pyrolyzed from cherry pit biomass (CP) at 500 °C, and we assessed their As and Hg sorption efficiencies in aqueous solutions in comparison to activated carbon (AC). The basic physicochemical and material characterization of the studied adsorbents was carried out using pH, electrical conductivity (EC), cation exchange capacity (CEC), concentration of surface functional groups (Boehm titration), and surface area (SA) analysis; elemental C, H, N analysis; and Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX). AsO43− anions and Hg2+ cations were selected as model contaminants used to test the sorption properties of the sorption materials. Characterization analyses confirmed a ninefold increase in SA in the case of CPB. The total C concentration increased by 26%, while decreases in the total H and N concentrations were observed. The values of carbonate and ash contents decreased by about half due to pyrolysis processes. The concentrations of surface functional groups of the analyzed biochar obtained by Boehm titration confirmed a decrease in carboxyl and lactone groups, while an increase in phenolic functional groups was observed. Changes in the morphology and surface functionality of the pyrolyzed material were confirmed by SEM–EDX and FTIR analyses. In sorption experiments, we found that the CPB showed better results in the sorption separation of Hg2+ than in the sorption separation of AsO43−. The sorption efficiency for the model cation increased in the order CP < CPB < AC and, for the model anion, it increased in the order CPB < CP < AC.

Emerging applications of biochar-based materials for energy storage and conversion

2019 ◽  
Vol 12 (6) ◽  
pp. 1751-1779 ◽  
Author(s):  
Wu-Jun Liu ◽  
Hong Jiang ◽  
Han-Qing Yu
Keyword(s):  
Energy Storage ◽  
Functional Groups ◽  
Energy Storage And Conversion ◽  
Surface Functional Groups ◽  
Energy Applications ◽  
Recent Advances ◽  
Open Questions ◽  
Application Potential ◽  
Current Energy

Biochar, a bio-carbon with abundant surface functional groups and easily tuned porosity produced from biomass, shows great application potential in energy storage and conversion. In this review, recent advances in the applications of biochar-based materials in various energy storage and conversion fields are summarized, highlighting the mechanisms and open questions in current energy applications.

X-ray photoelectron analysis of surface functional groups on diamond-like carbon films by gas-phase chemical derivatization method

2010 ◽  
Vol 42 (2) ◽  
pp. 77-87 ◽  
Author(s):  
Susumu Takabayashi ◽  
Keishi Okamoto ◽  
Hiroaki Motoyama ◽  
Tatsuyuki Nakatani ◽  
Hiroyuki Sakaue ◽  
...  
Keyword(s):  
Gas Phase ◽  
Functional Groups ◽  
Carbon Films ◽  
Diamond Like Carbon ◽  
Chemical Derivatization ◽  
Surface Functional Groups ◽  
X Ray ◽  
Phase Chemical

scholarly journals Recent advances in MXene-based force sensors: a mini-review

RSC Advances ◽  
2021 ◽  
Vol 11 (31) ◽  
pp. 19169-19184
Author(s):  
Dongchen Tan ◽  
Chengming Jiang ◽  
Xuguang Cao ◽  
Nan Sun ◽  
Qikun Li ◽  
...  
Keyword(s):  
Functional Groups ◽  
Force Sensors ◽  
Two Dimensional ◽  
Surface Functional Groups ◽  
2D Material ◽  
Recent Advances

As an emerging two-dimensional (2D) material, MXene has excellent conductivity and abundant surface functional groups.

Preparation and characterization of activated carbon fibers from liquefied wood by KOH activation

Holzforschung ◽  
2016 ◽  
Vol 70 (3) ◽  
pp. 195-202 ◽  
Author(s):  
Yuxiang Huang ◽  
Guangjie Zhao
Keyword(s):  
Activated Carbon ◽  
Functional Groups ◽  
Carbon Fibers ◽  
Chemical Activation ◽  
Bet Surface Area ◽  
Koh Activation ◽  
Activated Carbon Fibers ◽  
Surface Functional Groups ◽  
X Ray ◽  
Liquefied Wood

Abstract Activated carbon fibers (ACFs) have been prepared from liquefied wood (Wliq) by chemical activation with KOH, with a particular focus on the effect of KOH/fiber ratio in term of porous texture and surface chemistry. ACFs based on steam activation served as a blank for comparison. The properties of the ACFs were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), nitrogen adsorption/desorption, Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results show that the KOH-activated ACFs have rougher surfaces and more amorphous structure compared with the blank. The pore development was significant when the KOH/fiber ratio reached 3, and achieved a maximum Brunauer-Emmett-Teller (BET) surface area of 1371 m2 g-1 and total pore volume (Vtot) of 0.777 cm3 g-1, of which 45.3% belong to mesopores with diameters of 2–4 nm, while the blank activated at the same temperature had a BET surface of 1250 m2 g-1 and Vtot of 0.644 cm3 g-1, which are mainly micropores. The surface functional groups are closely associated with the KOH/fiber ratios. KOH-activated ACFs with KOH/fiber ratio of 3 have more oxygenated surface functional groups (C-O, C=O, -COOH) than the blank.

Study of Characteristic of Vetiver Fiber Before and after Alkaline Treatment

2010 ◽  
Vol 123-125 ◽  
pp. 1191-1194 ◽  
Author(s):  
Wimonlak Sutapun ◽  
Nitinat Suppakarn ◽  
Yupaporn Ruksakulpiwat
Keyword(s):  
Thermogravimetric Analysis ◽  
Specific Surface ◽  
Surface Area ◽  
Functional Groups ◽  
Surface Analysis ◽  
Alkaline Treatment ◽  
X Ray Diffraction ◽  
Surface Functional Groups ◽  
X Ray ◽  
Before And After

In this study, untreated and alkali-treated vetiver fibers were characterized by thermogravimetric analysis, BET surface analysis, X-ray diffraction and FTIR (ATR) microspectroscopy,. It was revealed that the alkaline treatment influenced properties of vetiver fiber. By the treatment, some hemicellulose and lignin were removed, resulting in higher decomposition temperatures. In addition, the specific surface area were decreased, and crystalline structure was altered. However, no evidence of changes in surface functional groups was observed.

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