Chemical Surface Characterization of Activated Carbons by Adsorption Excess of Probe Molecules

Treese, Julian; Pasel, Christoph; Luckas, Michael; Bathen, Dieter

doi:10.1002/ceat.201500571

Cited by 9 publications

(12 citation statements)

References 25 publications

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“…The two activated carbons D47/3 Extra (D47) and C40/4 Extra (C40) from Carbotech GmbH (Essen, Germany) are both steam‐activated. The surface of the activated carbon consists mainly of disordered, nonpolar, graphite‐like regions, nonpolar aliphatic groups, and some polar functional groups . With the adsorptives used, both dispersion interactions and interactions with the π electron system of the graphite‐like surface regions are possible.…”

Section: Methodsmentioning

confidence: 99%

Adsorption of the Inhalation Anesthetic Isoflurane from Dry and Humid Atmosphere

et al. 2019

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For environmental and occupational safety reasons, the inhalation anesthetic isoflurane must be removed from indoor air in hospitals. The present work investigated experimentally the coadsorption of isoflurane and water on four different commercial adsorbents: two activated carbons and two zeolites. Adsorption isotherms from dry and humid atmosphere are shown and discussed, i.e., mixture data are compared with those of the pure substances. For all four adsorbents the dominant parameter regarding structural properties is the pore size distribution. In the case of the zeolites, the surface chemistry, especially the aluminum content, plays a role, too.

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Section: Methodsmentioning

confidence: 99%

Adsorption of the Inhalation Anesthetic Isoflurane from Dry and Humid Atmosphere

et al. 2019

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“…The experimental excess isotherms did not follow the course of an idealized adsorption isotherm, but they showed linear sections within limited concentration ranges including the azeotropic point . It was assumed that within this limited range, the experimental adsorption isotherm behaves like an idealized adsorption isotherm, and the analysis of the isotherm shape (e.g., the position of the azeotropic point B) yields the mole fractions in the adsorbed phase according to the findings about idealized adsorption isotherms (Fig.…”

Section: Characterization Of Activated Carbonsmentioning

confidence: 99%

Characterization of Activated Carbon Adsorbents – State of the Art and Novel Approaches

et al. 2019

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Activated carbons are widely used as commercial adsorbents. Thermal or chemical activation creates a pore system and functional groups on the inner surface which may significantly change adsorption properties. Therefore, in addition to knowledge of the structural properties, a sound understanding of surface chemistry is indispensable. This paper summarizes the state of art as well as new developments in both fields. Standardized methods for characterizing structural properties are volumetric measurements and mercury porosimetry. To get a more detailed insight into the region of micropores, a probe molecule method was developed. For characterization of surface chemistry, methods such as IR spectroscopy, temperature-programmed desorption, and Boehm titration are subject of research. Novel methods were developed such as measuring of excess isotherms and calorimetric measurement of heat of adsorption, which are presented and discussed in greater detail in this paper. As each single method can only provide limited information, a better description of surface chemistry requires combination and careful interpretation of complementary information from different methods. Property Standard Limitation Apparent density ASTM D 2854-09 Total ash content ASTM D 2866-11 Moisture ASTM D 2867-17 Ball-pan hardness ASTM D 3802-16 pH-value ASTM D 3838-05 Electrical conductivity ASTM D 1125-14 Water soluble components ASTM D 5029-98 Volatile matter content ASTM D 5832-98 Acid extractable content ASTM D 6385-99 Particle size distribution ASTM D 2862-16 granular activated carbon ASTM D 5158-98 powdered activated carbon Ignition temperature ASTM D 3466-06 granular activated carbon Dusting attrition ASTM D 5159-04 granular activated carbon www.ChemBioEngRev.de

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“…Senyawa yang mempunyai density electron- lebih tinggi kemungkinan terserap lebih baik bila dibanding dengan density electron- rendah. Karbon aktif sebagian besar mengandung atom karbon aromatik sehingga mempunyai density electron- cukup tinggi dan hanya sebagian kecil (1 % hingga 10 %) mengandung atom karbon alifatik [25]. Namun, dalam kondisi ekperimen sulit sekali menentukan interaksi mana yang dominan terjadi di antara interaksi interaksi tersebut.…”

Section: Ujiadsorpsiunclassified

ANALISIS STRUKTUR DAN POROSITAS KOMPSOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK

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Safitri

Nurhasni

et al. 2018

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ANALISIS STRUKTUR DAN POROSITAS KOMPOSIT Fe 3 O 4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK. Komposit partikel magnet-karbon aktif dari limbah kertas telah berhasil dibuat. Karbon aktif dibuat dengan cara bahan kertas bekas dibakar dan selanjutnya direndam dalam asam kuat. Komposit Fe 3 O 4-karbon aktif dibuat dengan mencampurkan garam besi Fe 3+ /Fe 2+ (rasio mol 2 : 1) dengan suspensi karbon aktif dalam air. Larutan campuran garam besi-karbon aktif ditambahkan larutan NaOH tetes demi tetes pada kondisi suhu 70 o C. Analisis struktur, morfologi, ikatan kimia, sifat magnet dan porositas diselidiki dengan berbagai alat, berturut-turut menggunakan alat XRD, SEM, FTIR, VSM dan adsorpsi-desorpsi N 2 Quantasorb. Hasil karakterisasi menunjukkan bahwa nanopartikel Fe 3 O 4 telah berhasil tercangkok pada struktur karbon melalui interaksi gugus hidroksil. Bahan komposit mempunyai sifat magnetik berkelakuan superparamagnetik. Keberadaan nanopartikel Fe 3 O 4 pada struktur karbon membentuk sistem mesopori baru, dimana volume pori meningkat dari 0,07 cc/g menjadi 0,464 cc/g (meningkat 6 kali untuk karbon tanpa aktivasi dan meningkat dari 0,1053 cc/g menjadi 0,525 cc/g (meningkat 5 kali) untuk karbon aktivasi dengan sebaran ukuran pori rata-rata 17,5 nm. Hasil uji adsorpsi menunjukkan bahwa senyawa fenol dan metil jingga hanya mampu diserap 30% dalam larutan air, tetapi untuk senyawa metilen biru mampu diserap 96,3 % pada kondisi yang sama. Bahan komposit partikel magnet Fe 3 O 4 /karbon aktif limbah kertas dapat digunakan sebagai bahan alternatif menghilangkan zat warna metilena biru dalam limbah cair.

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Chemical Surface Characterization of Activated Carbons by Adsorption Excess of Probe Molecules

Cited by 9 publications

References 25 publications

Adsorption of the Inhalation Anesthetic Isoflurane from Dry and Humid Atmosphere

Adsorption of the Inhalation Anesthetic Isoflurane from Dry and Humid Atmosphere

Characterization of Activated Carbon Adsorbents – State of the Art and Novel Approaches

ANALISIS STRUKTUR DAN POROSITAS KOMPSOSIT Fe3O4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK

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