Use of vegetable oils and fatty acid methyl esters in the production of spherical activated carbons

Gryglewicz, S.; Grabas, K.; Gryglewicz, Grażyna

doi:10.1016/s0960-8524(00)00054-7

Cited by 22 publications

(14 citation statements)

References 12 publications

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“…As we know, for small molecules the adsorption occurs mainly in micropores, whereas for relatively bigger molecules the adsorption occurs mostly on the external surface, so the reason for the increase of adsorption amount of bigger molecules with the increase of micropore volume is mostly the increase of the adsorption power of micropores and not the effect of micropore filling. So the increase of adsorption amount of bigger molecules with the increase of micropore volume is less than that of smaller molecules, as shown in Figure 5 that for small molecule I 2 , the adsorbed molecules amounts increase sharply with the increase of micropores volume, whereas for VB 12 with bigger molecule dimension, the adsorption amount has no clear increase with the increase of micropore volume, since the diameter of micropores is too small to allow the VB 12 molecule through. And it also can be seen that the increased portion of adsorption amounts of VB 12 on ACAs is greater than that on CAs because of the increase of mesopore volume of ACAs, which indicates that mesopores also play a role in the adsorption of bigger molecules.…”

Section: Resultsmentioning

confidence: 95%

“…So the increase of adsorption amount of bigger molecules with the increase of micropore volume is less than that of smaller molecules, as shown in Figure 5 that for small molecule I 2 , the adsorbed molecules amounts increase sharply with the increase of micropores volume, whereas for VB 12 with bigger molecule dimension, the adsorption amount has no clear increase with the increase of micropore volume, since the diameter of micropores is too small to allow the VB 12 molecule through. And it also can be seen that the increased portion of adsorption amounts of VB 12 on ACAs is greater than that on CAs because of the increase of mesopore volume of ACAs, which indicates that mesopores also play a role in the adsorption of bigger molecules. So it is obvious that activation process developed better porous structure which is effective to adsorption not only of small molecules but also of relatively giant molecules.…”

Section: Resultsmentioning

confidence: 95%

“…The results are shown in Figure 4. Liquid-phase adsorption experiments were conducted using phenol, methylene blue, I 2 , and VB 12 as adsorbates. Figure 4 shows the trends of adsorption of four adsorbates on CAs and ACAs.…”

Section: Resultsmentioning

confidence: 99%

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Porous structure and liquid‐phase adsorption properties of activated carbon aerogels

Yang

2007

J of Applied Polymer Sci

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In this article, activated carbon aerogels (ACAs) were prepared by CO 2 activation. Their pore structures were investigated by N 2 adsorption-desorption analysis. ACAs have excellent microporosity (e.g. 0.36 cm 3 /g) and mesoporosity (e.g. 1.72 cm 3 /g). Adsorption characteristics of phenol, methylene blue, I 2 , and VB 12 on ACAs in the liquid phase were studied by static adsorption experiments. Results showed that CO 2 activation process is an effective way to introduce micropores in carbon aerogels, which is enhanced with the increase of activation time. As a result, the adsorption capacities of the four mentioned adsorbates on ACAs were improved gradually with the increase of activation time. However, mesopore volume is also a factor on improving adsorption properties for the relatively giant molecules methylene blue and VB 12 .

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 95%

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Porous structure and liquid‐phase adsorption properties of activated carbon aerogels

Yang

2007

J of Applied Polymer Sci

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“…Linseed oil is used in a wide variety of applications, including additives in PVC plastics, anti-rust agents, laquers and paints (Kanta-Oksa 1992, Chimielarz et al 1995, Rüsch gen Klaas andWarwel 1999), aroma substances for the food industry (Bonnarme et al 1997) or volatile compounds for obtaining a fresh green odour to offset the decreased odour caused by the processing of vegetables (Noodermeer et al 2002). Special technical applications have also been suggested, for example as an agglomerating agent for coal (Gryglewicz et al 2000). In addition to these technical uses, linseed oil is used as an edible oil (Sridhar et al 1991, Morris and Vaisey-Genser 2003, Sikorska et al 2005.…”

Section: Introductionmentioning

confidence: 99%

Quality characteristics of edible linseed oil

Nykter¹,

KYMÄLÄINEN²,

Gates³

2008

AFSci

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In this review the quality properties of linseed oil for food uses are discussed as well as factors affecting this quality. Linseed oil has a favourable fatty acid composition with a high linolenic acid content. Linseed oil contains nearly 60% α-linolenic acid, compared with 25% for plant oils generally. The content of linolenic acid and omega-3 fatty acids is reported to be high in linseed grown in northern latitudes. The composition of fatty acids, especially unsaturated fatty acids, reported in different studies varies considerably for linseed oil. This variation depends mainly on differences in the examined varieties and industrial processing treatments. The fatty acid composition leads also to some problems, rancidity probably being the most challenging. Some information has been published concerning oxidation and taste, whereas only a few studies have focused on colour or microbiological quality. Rancidity negatively affects the taste and odour of the oil. There are available a few studies on effects of storage on composition of linseed oil. In general, storage and heat promote auto-oxidation of fats, as well as decrease the amounts of tocopherols and vitamin E in linseed oil. Several methods are available to promote the quality of the oil, including agronomic methods and methods of breeding as well as chemical, biotechnological and microbiological methods. Time of harvesting and weather conditions affect the quality and yield of the oil.

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“…Tung oil is made of 80% 9,11,13-octadecatrienoic acid with conjugated double bonds, 8,[12][13][14][15] 8% oleic acid (18 : 1), 5% saturated fatty acids, 4% linoleic acid (18 : 2), and 3% linolenic acid (18 : 3). Oil drying is an autoxidation reaction that uses atmospheric oxygen.…”

Section: Introductionmentioning

confidence: 99%

Structure characterization of films from drying oils cured under infrared light

Wang

Padua

2009

J of Applied Polymer Sci

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Drying oils have been considered as water resistant coatings for bio-based packaging materials; however, their curing rates are slow for industrial applications. Infrared radiation was investigated in this study as a means to increase the curing rate of linseed and tung oils. The effect of oil pretreatment with gamma radiation was also investigated. FTIR spectroscopy was used to monitor chemical changes during oil oxidation. Results indicated that infrared radiation increased the curing rate of linseed and tung oils. The oxidation rate of both oils, as monitored by the decrease of the 3010 cm À1 FTIR peak, followed an exponential decay. The structure of cured films was examined by SEM. Images of films cross section were used to develop a qualitative model of the curing process. Linseed and tung oil showed differences in structural development during drying. In the case of linseed oil, the formation of a tough skin layer slowed down oxygen diffusion to the oil underneath, resulting in slow curing. For the case of tung oil, the skin layer shrank as it formed allowing oxygen diffusion and fast curing of tung oil.

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Use of vegetable oils and fatty acid methyl esters in the production of spherical activated carbons

Cited by 22 publications

References 12 publications

Porous structure and liquid‐phase adsorption properties of activated carbon aerogels

Porous structure and liquid‐phase adsorption properties of activated carbon aerogels

Quality characteristics of edible linseed oil

Structure characterization of films from drying oils cured under infrared light

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