Carbon Xerogel/TiO2 composites as photocatalysts for acetaminophen degradation

2021 ◽  
Vol 412 ◽  
pp. 113248
Author(s):  
Raíra da Cunha ◽  
Walker Vinícius Ferreira do Carmo Batista ◽  
Hanna Leijoto de Oliveira ◽  
Ana Cláudia dos Santos ◽  
Patrícia Moreira dos Reis ◽  
...  
Keyword(s):  
Carbon Xerogel

Biosourced, highly porous, carbon xerogel microspheres

RSC Advances ◽  
2016 ◽  
Vol 6 (70) ◽  
pp. 65698-65708 ◽  
Author(s):  
L. I. Grishechko ◽  
G. Amaral-Labat ◽  
V. Fierro ◽  
A. Szczurek ◽  
B. N. Kuznetsov ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Carbon Xerogel ◽  
Highly Porous

The first tannin-based carbon xerogel microspheres were prepared and characterised.

scholarly journals PENGARUH PENAMBAHAN DUAL KATALIS PADA SILICA-CARBON XEROGEL SEBAGAI MATERIAL PELAPIS ORGANO SILICA MEMBRANES

Konversi ◽  
2018 ◽  
Vol 7 (2) ◽  
Author(s):  
Muthia Elma ◽  
Adhe Paramita ◽  
Anna Sumardi
Keyword(s):  
Thin Film ◽  
Sol Gel ◽  
Carbon Xerogel ◽  
Silica Membranes ◽  
Carbon Thin Film

Abstrak- Proses sol-gel adalah proses polimerisasi senyawa kimia (precursor) melalui reaksi hidrolisis dan kondensasi dalam larutan pada suhu rendah. Nlai pH mempengaruhi daya larut precursor dan rasio konfigurasi ion yang dapat larut dan mengendap. Secara fundamental larutan sol yang memiliki pH > 7 akan memiliki morfologi  makroskopik sedangkan pH < 7 memiliki morfologi mikroskopik. Tujuan dari penelitian ini adalah untuk menentukan kondisi optimum dari thin film yang dihasilkan dari proses sol-gel yang nantinya bisa diaplikasikan sebagai pelapis pada membrane organo-silica untuk proses desalinasi air asin. Metode yang digunakan pada penelitian ini adalah sol-gel menggunakan dua katalis (basa dan asam organik), dengan perbandingan 1:38:X:5:Y (molar rasio). Dimana X:Y adalah asam sitrat (C6H8O7):ammonia (NH3). Perbandingan molar rasio katalis asam sitrat:ammonia yaitu 0.01 : (0.01; 0.0015; 0.001)  dan 0.001 : (0.01; 0.0015; 0.001) dengan suhu proses 0OC. Hasilnya dikarakterisasi menggunakan uji FTIR. Hasil penelitian ini menunjukkan semakin rendah katalis molar rasio asam sitrat maka pH yang didapatkan semakin tinggi dan ukuran pori-pori semakin besar. Sampel menghasilkan pH berkisar 5,32-8,56. Pada pH asam menghasilkan silanol (2.0) dan siloxane (7.4) sedangkan pada pH basa menghasilkan silanol (1.7) dan dan siloxane (6.2). Jadi, sols optimum sebagai thin film yang dihasilkan adalah pada pH 6.0 yang memiliki silanol (1.0) dan siloxane (4.7) dengan kalsinasi xerogel yang optimum terdapat pada suhu kaslinasi 175OC, karena adanya kandungan ikatan karbon yaitu struktur C=C-H (alkena) pada peak 3750cm-1. Ikatan karbon pada membran dapat membuat membran stabil.  Kata kunci: ammonia, citrit acid, silica-carbon thin film, xerogel 

Electrochemical properties of carbon xerogel containing nitrogen in a carbon matrix

2012 ◽  
Vol 162 ◽  
pp. 24-30 ◽  
Author(s):  
Mariana Botelho Barbosa ◽  
Jefferson Patricio Nascimento ◽  
Patricia B. Martelli ◽  
Clascidia Aparecida Furtado ◽  
Nelcy Della Santina Mohallem ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Carbon Matrix ◽  
Carbon Xerogel

Resorcinol–formaldehyde carbon xerogel as selective adsorbent of carbon dioxide present on biogas

Adsorption ◽  
2018 ◽  
Vol 24 (2) ◽  
pp. 169-177 ◽  
Author(s):  
Jose F. Vivo-Vilches ◽  
Agustín F. Pérez-Cadenas ◽  
Francisco J. Maldonado-Hódar ◽  
Francisco Carrasco-Marín ◽  
Maria J. Regufe ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Xerogel ◽  
Resorcinol Formaldehyde ◽  
Selective Adsorbent

Preparation and Characterization of Carbon Xerogel Based Composites for Electrochemical Sensing and Photocatalytic Degradation

2021 ◽  
Vol 21 (4) ◽  
pp. 2323-2333
Author(s):  
Carmen I. Fort ◽  
Mihai M. Rusu ◽  
Lucian C. Pop ◽  
Liviu C. Cotet ◽  
Adriana Vulpoi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Degradation ◽  
Electrochemical Sensors ◽  
Sol Gel ◽  
Nanocomposite Material ◽  
Electrochemical Sensing ◽  
Ambient Conditions ◽  
Carbon Xerogel ◽  
Voltammetric Detection

In order to obtain a multifunctional nanocomposite material-for electrochemical sensors and photocatalytic applications, structures based on Bi, Fe and TiO2 were grown inside carbon xerogel supports (BiFeCX and BiFeCX-TiO2). First, a wet polymer containing Bi and Fe salts was obtained by following a modified resorcinol-formaldehyde based sol–gel route, followed by drying in ambient conditions, and pyrolysis under inert atmosphere. Then, through TiCl4 hydrolysis, TiO2 nanoparticles were deposited on the BiFeCX xerogel leading to BiFeCX-TiO2. The morphological and structural characterization of the investigated nanocomposites consisted in X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and N2 adsorption measurements, revealing porous carbon structures with embedded nanoparticles and the particularities driven by the pyrolysis and TiCl4 treatment. The new modified electrodes based on BiFeCX or BiFeCX-TiO2 nanocomposite materials, kept in a chitosan matrix (Chi) and deposited on a glassy carbon (GC) electrode surface (GC/Chi-BiFeCX or GC/Chi-BiFeCX-TiO2), were obtained and investigated for Pb(II) voltammetric detection and H2O2 amperometric detection. Moreover, the BiFeCX-TiO2 nanocomposite was tested for the photocatalytic degradation of methyl orange. The great potential of BiFeCX nanocomposite material for developing electrochemical sensors, or BiFeCX-TiO2 for sensors application and photocatalytic application was demonstrated.

Tailored synthesis of hybrid iron-nitrogen-graphene with reduced carbon xerogel as an efficient electrocatalyst towards oxygen reduction

Ionics ◽  
2020 ◽  
Vol 26 (12) ◽  
pp. 6255-6264 ◽  
Author(s):  
S. Seetharaman ◽  
S. Vinod Selvaganesh ◽  
Raghuram Chetty
Keyword(s):  
Oxygen Reduction ◽  
Carbon Xerogel

scholarly journals Carbon-Supported Mo2C for Oxygen Reduction Reaction Electrocatalysis

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1805
Author(s):  
Dušan Mladenović ◽  
Milica Vujković ◽  
Slavko Mentus ◽  
Diogo M. F. Santos ◽  
Raquel P. Rocha ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Double Layer ◽  
Molybdenum Carbide ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Carbon Xerogel ◽  
Electrocatalytic Properties ◽  
Molybdenum Carbides

Molybdenum carbide (Mo2C)-based electrocatalysts were prepared using two different carbon supports, commercial carbon nanotubes (CNTs) and synthesised carbon xerogel (CXG), to be studied from the point of view of both capacitive and electrocatalytic properties. Cation type (K+ or Na+) in the alkaline electrolyte solution did not affect the rate of formation of the electrical double layer at a low scan rate of 10 mV s−1. Conversely, the different mobility of these cations through the electrolyte was found to be crucial for the rate of double-layer formation at higher scan rates. Molybdenum carbide supported on carbon xerogel (Mo2C/CXG) showed ca. 3 times higher double-layer capacity amounting to 75 mF cm−2 compared to molybdenum carbide supported on carbon nanotubes (Mo2C/CNT) with a value of 23 mF cm−2 due to having more than double the surface area size. The electrocatalytic properties of carbon-supported molybdenum carbides for the oxygen reduction reaction in alkaline media were evaluated using linear scan voltammetry with a rotating disk electrode. The studied materials demonstrated good electrocatalytic performance with Mo2C/CXG delivering higher current densities at more positive onset and half-wave potential. The number of electrons exchanged during oxygen reduction reaction (ORR) was calculated to be 3, suggesting a combination of four- and two-electron mechanism.

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