scholarly journals Ethylene Adsorption Using Cobalt Oxide-Loaded Polymer-Derived Nanoporous Carbon and Its Application to Extend Shelf Life of Fruit

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1507 ◽  
Author(s):  
Imam Prasetyo ◽  
Nur Indah Fajar Mukti ◽  
Teguh Ariyanto
Keyword(s):  
Shelf Life ◽  
Cobalt Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Carbon Surface ◽  
Calcination Process ◽  
Weight Percentage ◽  
Ethylene Adsorption ◽  
Ethylene Removal

Suppressing the amount of ethylene during storage has been of interest as a method to enhance shelf life of fruit. In this work, ethylene removal by adsorption using cobalt oxide-impregnated nanoporous carbon has been studied. Nanoporous carbon with a high surface area up to 2400 m2 g−1 was prepared by carbonization process biomass and synthetic polymer at 850 °C. Dispersion of cobalt oxide on porous carbon surface was carried out by an incipient wetness procedure followed by calcination process at 200 °C. Ethylene adsorption test was performed using a volumetric method in an ultrahigh vacuum rig constructed by Swagelok VCR® fittings. The results showed that the cobalt oxide/carbon system had significant ethylene adsorption capacity. Ethylene uptake increases with the increasing cobalt oxide loading on the carbon. The highest ethylene capacity of 16 mol kg−1 adsorbent was obtained by using 30 wt.% (weight percentage) of cobalt oxide dispersed in polymer-derived carbon. In closed storage, the ratio of 15 g adsorbent/kg fruit may extend the storage life up to 12 d, higher than that without adsorbent (3 d). Therefore, the results demonstrate the great potential use of cobalt oxide-impregnated nanoporous carbon as an adsorbent for ethylene removal during storage of fruit.

scholarly journals Removing Ethylene by Adsorption using Cobalt Oxide-Loaded Nanoporous Carbon

2018 ◽  
Vol 18 (1) ◽  
pp. 9 ◽  
Author(s):  
Imam Prasetyo ◽  
Nur Indah Fajar Mukti ◽  
Moh Fahrurrozi ◽  
Teguh Ariyanto
Keyword(s):  
Cobalt Oxide ◽  
Potential Method ◽  
Nanoporous Carbon ◽  
Long Distance ◽  
Long Distance Transport ◽  
Ethylene Adsorption ◽  
Higher Temperature ◽  
Ethylene Removal ◽  
Subsequent Storage ◽  
Distance Transport

Ethylene is naturally generated by climacteric fruits and can promote the ripening process faster. For effective long-distance transport and subsequent storage, removing ethylene from the storage environment has been of interest to suppress its undesirable effect. In this study, ethylene removal by an adsorptive method using cobalt-loaded nanoporous carbon is studied. Cobalt oxide-loaded carbon was prepared by incipient wetness method followed by calcination process at 200 °C under inert flow. Ethylene adsorption test was performed at 20, 30, and 40 °C using a static volumetric test. The results showed that cobalt oxide/carbon system has significant ethylene adsorption capacity up to 3.5 times higher compared to blank carbon. A higher temperature adsorption is more favorable for this chemisorption process. Ethylene uptake increases from 100 to 150 mL g-1adsorbent STP by increasing cobalt oxide loading on carbon from 10 to 30 wt.% Co. The highest uptake capacity of 6 mmol ethylene per gram adsorbent was obtained using 30 wt.% cobalt oxide. Therefore, ethylene adsorption by cobalt-loaded nanoporous carbon may represent a potential method in ethylene removal and it could serve as a basis for development of ethylene scavenging material.

scholarly journals Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 657
Author(s):  
Geul Han Kim ◽  
Yoo Sei Park ◽  
Juchan Yang ◽  
Myeong Je Jang ◽  
Jaehoon Jeong ◽  
...  
Keyword(s):  
High Activity ◽  
Cobalt Oxide ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Cobalt Hydroxide ◽  
Ni Foam ◽  
Electron Conduction

Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.

scholarly journals Effect of Microwave Heating Conditions on the Preparation of High Surface Area Activated Carbon from Waste Bamboo

2015 ◽  
Vol 34 (7) ◽  
pp. 667-674
Author(s):  
Jian Wu ◽  
Hongying Xia ◽  
Libo Zhang ◽  
Yi Xia ◽  
Jinhui Peng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Microwave Heating ◽  
Surface Area ◽  
Microwave Power ◽  
High Surface ◽  
High Surface Area ◽  
Significant Proportion ◽  
Heating Time ◽  
Raw Material ◽  
Carbon Surface

Abstract The present study reports the effect of microwave power and microwave heating time on activated carbon adsorption ability. The waste bamboo was used to preparing high surface area activated carbon via microwave heating. The bamboo was carbonized for 2 h at 600°C to be used as the raw material. According to the results, microwave power and microwave heating time had a significant impact on the activating effect. The optimal KOH/C ratio of 4 was identified when microwave power and microwave heating time were 700 W and 15 min, respectively. Under the optimal conditions, surface area was estimated to be 3441 m2/g with pore volume of 2.093 ml/g and the significant proportion of activated carbon was microporous (62.3%). The results of Fourier transform infrared spectroscopy (FTIR) were illustrated that activated carbon surface had abundant functional groups. Additionally the pore structure is characterized using Scanning Electron Microscope (SEM).

Catalytic conversion of methyl oleate to hydrocarbons: impact of cobalt oxide species integration in SiO2–Al2O3

2020 ◽  
Vol 4 (7) ◽  
pp. 3308-3317
Author(s):  
R. Krishnapriya ◽  
Unnati Gupta ◽  
Vineet K. Soni ◽  
Rakesh K. Sharma
Keyword(s):  
Methyl Oleate ◽  
Surface Area ◽  
Cobalt Oxide ◽  
Catalytic System ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Conversion ◽  
High Quality ◽  
Selective Deoxygenation

A unique, high surface area Co3O4/SiO2–Al2O3 catalytic system has been developed for the selective deoxygenation of biomass to high quality diesel-grade hydrocarbons.

Effect of Carbon Pososity on the Electrochemical Properties of Carbon/Polyaniline Supercapacitor Electrodes

2013 ◽  
Vol 16 (3) ◽  
pp. 189-195
Author(s):  
M. A. Torre ◽  
C. Del Río ◽  
E. Morales
Keyword(s):  
Electrochemical Properties ◽  
In Situ Polymerization ◽  
Activated Carbons ◽  
Discharge Rate ◽  
High Surface ◽  
Polymer Concentration ◽  
High Surface Area ◽  
Carbon Surface ◽  
Aniline Monomer ◽  
Acid Media

Supercapacitors have attracted great attention in power source applications, due to their high power density, elevated charge/discharge rate, good reversibility and long life. Activated carbons are the most frequently used electrode material, due to their high accessibility, non-toxicity, high chemical stability, good electrical conductivity, high surface area and low cost, but in practice the capacitance values are limited by the material microstructure. In this work we report on the synthesis and electrochemical characterization of carbon/polyaniline composites, synthesized by in-situ polymerization in acid media of aniline monomer on the surface of two activated carbons having different textural properties, and on the effect of the carbon porosity on the electrochemical properties of the electrodes. Results obtained indicate that the BET specific surface of the composites decreases sharply due to the collapse of the porous structure (mainly the micropores) of the carbon by the polyaniline chains. Regarding capacitance values, Csp increases on increasing polyaniline loading in the composite, however high polymer concentration lead to a decrease on capacitance when high current were applied, probably due to diffusion restrictions of the electrolyte anions and cations to the carbon surface.

One-Step Synthesis of Nano-Size Iron Oxide /Three-Dimensional Wormlike Hierarchical Mesoporous SiO2 Catalysts and its Catalytic Performance on Phenol Hydroxylation

2013 ◽  
Vol 662 ◽  
pp. 202-206
Author(s):  
Jia Feng Wu ◽  
Yu Mei Zhao ◽  
Peng Liang
Keyword(s):  
Iron Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Catalytic Performance ◽  
Phenol Hydroxylation ◽  
Weight Percentage ◽  
One Step ◽  
Hierarchical Pore ◽  
Nano Size

A series of nano-sized iron oxide supported on 3D wormlike hierarchical mesoporous SiO2 catalysts were synthesized by one-step hydrothermal synthesis. The samples were characterized by XRD, N2 sorption, FT-IR, UV–Vis, TEM and ICP-AES. The catalysts were probed for the oxidation of phenol employing hydrogen peroxide. The results indicate that the materials exhibit high surface area and 3D wormlike hierarchical pore, iron ions exist as isolated framework species when the weight percentage content of iron is below 0.24 and nano-size iron oxide is dispersed in the surface (iron content above 0.24 wt%). Catalytic performance indicates that nano-size iron oxide supported on SiO2 is useful to enhance both the catalytic activity and the selectivity of target products compared with isolated iron species.

scholarly journals Evaluation of the photocatalytic ability of a sol-gel-derived MgO-ZrO2 oxide material

2017 ◽  
Vol 15 (1) ◽  
pp. 7-18 ◽  
Author(s):  
Filip Ciesielczyk ◽  
Weronika Szczekocka ◽  
Katarzyna Siwińska-Stefańska ◽  
Adam Piasecki ◽  
Dominik Paukszta ◽  
...  
Keyword(s):  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Oxide Material ◽  
Particle Sizes ◽  
Characteristic Functional ◽  
Photocatalytic Ability ◽  
Calcination Process ◽  
Organic Precursors

AbstractThis paper deals with the synthesis and characterization of a novel group of potential photocatalysts, based on sol-gel-derived MgO-ZrO2 oxide material. The material was synthesized in a typical sol-gel system using organic precursors of magnesia and zirconia, ammonia as a promoter of hydrolysis and methanol as a solvent. All materials were thoroughly analyzed, including morphology and particle sizes, chemical composition, identification of characteristic functional groups, porous structure parameters and crystalline structure. The proposed methodology of synthesis resulted in obtaining pure MgO-ZrO2 oxide material with micrometric-sized particles and a relatively high surface area. The samples underwent an additional calcination process which led to the crystalline phase of zirconia being formed. The key element of the study was the evaluation of the effectiveness of decomposition of C.I. Basic Blue 9 dye. It was shown that the calcined materials exhibit both satisfactory adsorption and photocatalytic activity with respect to the decomposition of a selected model organic impurity. Total dye removal varied in the range of 50-70%, and was strongly dependent on process parameters such as quantity of photocatalyst, time of irradiation, and the addition of promoters.

scholarly journals Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

2019 ◽  
Vol 5 (1) ◽  
pp. 10 ◽  
Author(s):  
Lok Shrestha ◽  
Mamata Thapa ◽  
Rekha Shrestha ◽  
Subrata Maji ◽  
Raja Pradhananga ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Rice Husk ◽  
Carbon Materials ◽  
High Surface ◽  
High Surface Area ◽  
Nanoporous Carbon ◽  
Adsorption Properties ◽  
Methylene Blue Adsorption ◽  
Nanoporous Carbon Materials

Iodine and methylene blue adsorption properties of the high surface area nanoporous carbon materials derived from agro-waste and rice husk is reported. Rice husk was pre-carbonized at 300 °C in air followed by leaching out the silica nanoparticles by extraction with sodium hydroxide solution. The silica-free rice husk char was mixed with chemical activating agents sodium hydroxide (NaOH), zinc chloride (ZnCl2), and potassium hydroxide (KOH) separately at a mixing ratio of 1:1 (wt%) and carbonized at 900 °C under a constant flow of nitrogen. The prepared carbon materials were characterized by scanning electron microscopy (SEM), Fourier transformed-infrared spectroscopy (FT-IR), powder X-ray diffraction (pXRD), and Raman scattering. Due to the presence of bimodal micro- and mesopore structures, KOH activated samples showed high specific surface area ca. 2342 m2/g and large pore volume ca. 2.94 cm3/g. Oxygenated surface functional groups (hydroxyl, carbonyl, and carboxyl) were commonly observed in all of the samples and were essentially non-crystalline porous particle size of different sizes (<200 μm). Adsorption study revealed that KOH activated samples could be excellent material for the iodine and methylene blue adsorption from aqueous phase. Iodine and methylene blue number were ca. 1726 mg/g and 608 mg/g, respectively. The observed excellent iodine and methylene blue adsorption properties can be attributed to the well-developed micro- and mesopore structure in the carbon material. This study demonstrates that the agricultural waste, rice husk, and derived nanoporous carbon materials would be excellent adsorbent materials in water purifications.

scholarly journals Synthesis of Graphite Porous Electrode Based on Coconut Shell as a Potential Cathode in Bioelectrosyntesis Cell

2019 ◽  
Vol 19 (2) ◽  
pp. 413
Author(s):  
Aris Mukimin ◽  
Rustiana Yuliasni ◽  
Nur Zen ◽  
Kukuh Wicaksono ◽  
Januar Arif Fatkhurahman ◽  
...  
Keyword(s):  
Surface Area ◽  
High Surface ◽  
Porous Electrode ◽  
High Surface Area ◽  
Atmospheric Condition ◽  
Coconut Shell ◽  
Carbon Surface ◽  
Working Volume ◽  
Cell Reactor ◽  
Materials Used

Electrodes, as well as microorganisms, are key materials for the development of bioelectrosynthesis cell reactor. Materials used as electrodes should be inert, crystalline in structure with high surface area and porous morphology, enhancing their electroactive and adsorptive properties. Carbon material derived from coconut shell was modified by simultaneous sintering-activation methods, FeCl3 and ZnCl2 were supplemented at temperature 900 °C at the non-atmospheric condition. The modified carbon was then molded with polyvinyl alcohol as a binder and the temperature was maintained at 80 °C and 10 ton of pressure. Molded carbon was then installed in bioelectrosynthesis cell with a working volume of 200 mL, as a cathode. XRD, BET, and SEM measurements showed the transformation of carbon surface from amorphous into the crystalline, increased surface area (11 times higher) and higher porosity (up to 500 nm). This cathode modification was able to increase current density up to 4 times and reduce CO2 into butyrate, 250 mg/L, in bioelectrosynthesis cell.

Sign in / Sign up

Export Citation Format

Share Document