Möglichkeiten der elektrochemischen Kohleumwandlung

Coughlin, Robert W.; Kreysa, G.

doi:10.1002/cite.330550104

Cited by 14 publications

(1 citation statement)

References 24 publications

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“…Thus, in view of the data presented in Table 5 it is observed that on the one hand, the values of R 2 are in the order of 0.8 and on the other hand, the value of experimental q e [ Table 3] is 10.1 mg•g -1 and calculated value from first order pseudo model is 3.34 mg•g -1 . Similarly, it has been found in other research [42] that this model is not the most appropriate for adjusting adsorption kinetics data to carbonaceous materials.…”

Section: Kinetic Models Of Processesmentioning

confidence: 74%

Kinetic Study of Copper Retention by Kaolin Using a System of Supports Designed in 3D

Macı́as-Garcı́a

Calderón-Rios

Dı́az-Dı́ez

et al. 2020

Advanced Materials Science and Technology

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Kaolin is a clay product of the decomposition of feldspatic rocks; it is a hydrated aluminum silicate whose main component is kaolinite; its formula is 2H 2 O-Al 2 O 3-2SiO 2 and it has a wide application in various industries. In this study copper ions removal of aqueous solutions using kaolin, was investigated. Kaolin sample are texturally and chemically characterized and its electrical conductivity was established, and finally diverse kinetic models were tested to the copper ion retention process. Kinetic adsorption and electroadsorption processes of Cu (II) ions on kaolin are practically identical. The q e values for both adsorption and electroadsorption are of the order of 10.1 mg•g-1 for an equilibration time of 1200 min. This suggests that adsorption procedure is the determining factor. In view of results, we can indicate that kinetic adsorption procedure of Cu (II) ions on kaolin is adjusted to a pseudo second order kinetics. High regression coefficients are reached, greater than those of first order pseudo model, with worths above 0.99. Its explanation comes from the valence forces involved in the adsorption mechanism, due to electrons exchange between Cu (II) ions and the adsorbent. Likewise, correlation between experimental q e values, and the calculated q e , through the kinetic model are good. A more detailed observation through intraparticle diffusion model allows us to distinguish two well defined linear parts, a first one: that would correspond to the transport of ions from the dissolution to the external covering of the absorbent, with a fast ions distribution on the external kaolin covering. And a second part, which symbolize the intraparticular diffusion, as well as Cu (II) union with the kaolin internal active sites. Keywords Kaolin; copper; adsorption; kinetic 1. INTRODUCTION Kaolin is a hydrated aluminum silicate, product of the decomposition of feldspatic rocks mainly. The term

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Section: Kinetic Models Of Processesmentioning

confidence: 74%

Kinetic Study of Copper Retention by Kaolin Using a System of Supports Designed in 3D

Macı́as-Garcı́a

Calderón-Rios

Dı́az-Dı́ez

et al. 2020

Advanced Materials Science and Technology

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Frohning¹

2020

Catalysis From a to Z

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Elektrochemie schwarzer Kohlenstoffe

Besenhard

Fritz

1983

Angewandte Chemie

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Professor Ernst Otto Fischer zum 65. Geburtstag gewidmetKohlenstoff-,,Modifikationen" zeigensofern sie iiberwiegend die Schichtstruktur des Graphits aufweisen -1) elektronische Leitfihigkeit, 2) die Fahigkeit, Ionen oder Molekiile zwischen die Schichten des Gitters einzulagern, und 3) die Fahigkeit, uber funktionelle Gruppen ihrer Oberflachen (im wesentlichen der Schichtrander) zu reagieren. Dem ersten Aspekt verdanken sie ihre Anwendung als ,,inertes" Elektrodenmaterial; darauf sei hier nicht nilher eingegangen. Die Kombination der Punkte 1) und 2) eroffnet die Mbglichkeit der elektrochemischen Intercalation, deren Grundlagen, Methodik und Anwendungen vorgestellt werden. Neben der Bildung von Graphitsalzen wird auch die von Graphitoxid beschrieben; weiterhin werden die Methoden zur Untersuchung solcher Produkte referiert. Auch die funktionellen Gruppennach 3) -lassen sich elektrochemisch umsetzen. Aktuelle Untersuchungen betreffen Elektroden aus chemisch modifiziertem Kohlenstoff, Oberflilchenoxide und -fluoride sowie die Oberflachenoxidation von Kohlenstoff-Fasern irn Hinblick auf den technischen Einsatz in Verbundwerkstoffen. Eine Fiille weiterer Anwendungsmaglichkeiten zeichnet sich ab. 954 0 Verlag Chemie GmbH. 0-6940 Weinheim. 1983 elementaren Kohlenstoffs, die zumindest iiberwiegend graphitartige Schichtstruktur und damit auch eine gewisse elektrische Leitfiihigkeit aufweisen -Kohlenstoff ist ja wie kein anderes Element in nahezu beliebiger Abstufung der strukturellen Ordnung und der Morphologie verfugbar, etwa von streng dreidimensional geordnetem Graphit bis hin zu rantgenamorphem Glaskohlenstoff 114J. Ziel dieses Beitrags ist es, die Chemie uon und nicht an Kohlenstoff-Elektroden vonustellen -Reaktionen an ,,inerten" Kohlenstoff-Elektroden bleiben somit ausgeklammert. 0044-8249/83/1212-0954 $02.50/0 Angew. Chem. 95 (1983) 954-980

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Möglichkeiten der elektrochemischen Kohleumwandlung

Cited by 14 publications

References 24 publications

Kinetic Study of Copper Retention by Kaolin Using a System of Supports Designed in 3D

Kinetic Study of Copper Retention by Kaolin Using a System of Supports Designed in 3D

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Elektrochemie schwarzer Kohlenstoffe

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