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Strong discs of activated carbons from hydrothermally carbonized beer waste
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).ORCID-id: 0000-0002-4176-1899
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: Carbon, ISSN 0008-6223, E-ISSN 1873-3891, Vol. 78, s. 521-531Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Strong and dense activated carbon discs (ACDs) were synthesized and studied. The discs were produced in a multistep manner from a precursor based on hydrothermally treated beer waste (HTC-BW). The precursor was processed by pulsed current processing (PCP) into ACDs. These discs were activated by physical activation in CO2 at an elevated temperature. The ACDs had surface areas of ∼500 m2/g and contained significant amounts of micro-, meso-, and macropores. The effect on the temperature during the PCP and the presence of tar in the precursor were studied with respect to the properties of the discs. The ACDs had strengths up to 7.2 MPa with densities up to 1.4 g/cm3. The density is the highest reported for discs of activated carbon.

Ort, förlag, år, upplaga, sidor
2014. Vol. 78, s. 521-531
Nationell ämneskategori
Materialkemi
Forskningsämne
materialkemi
Identifikatorer
URN: urn:nbn:se:su:diva-107668DOI: 10.1016/j.carbon.2014.07.036ISI: 000341463900055OAI: oai:DiVA.org:su-107668DiVA, id: diva2:749316
Forskningsfinansiär
Berzelii Centre EXSELENTTillgänglig från: 2014-09-23 Skapad: 2014-09-23 Senast uppdaterad: 2017-12-05Bibliografiskt granskad
Ingår i avhandling
1. Refining of hydrochars/ hydrothermally carbonized biomass into activated carbons and their applications
Öppna denna publikation i ny flik eller fönster >>Refining of hydrochars/ hydrothermally carbonized biomass into activated carbons and their applications
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Hydrothermally treated biomass could not only be used as a fuel or a fertilizer but it can also be refined into high-value products. Activated carbons are one of those. In the studies of this thesis, four different hydrothermally carbonized (HTC) biomasses, including horse manure, grass cuttings, beer waste and biosludge, have been successfully made into activated carbons. The activated carbon materials were in the forms of powdered activated carbons, powdered composites of activated carbon and iron oxide nano-crystals, and activated carbon discs.

The HTC biomasses and the activated carbons were characterized and analyzed using several methods. The biomasses were carbonized to different extent during the hydrothermal treatment, which depended on the different natures of the biomasses. The HTC biomasses were activated into powdered activated carbons by both physical activation, using CO2, and by chemical activation, using H3PO4. Full factorial design matrices were applied to design experiments and study the influence of different parameters used during both physical and chemical activation. Activated carbons with embedded iron oxide nanoparticles were synthesized through hydrothermal carbonization followed by CO2 activation. These composites had high surface areas and showed a strong magnetism, and the powders could be separated from liquid phase by applying a magnetic field. Strong and dense activated carbon discs were also prepared from powdered HTC beer waste by pulsed current processing (PCP) and a subsequent CO2 activation procedure. The potential for carbon dioxide separation from nitrogen, and methylene blue adsorption in aqueous solution, were assessed for the powdered activated carbons produced from HTC biomasses. They showed good performance in both applications. 

Ort, förlag, år, upplaga, sidor
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2014. s. 68
Nyckelord
Hydrothermally carbonized biomass, activated carbon, full factorial design, activated carbon disc, nanoparticles, iron oxide, CO2 separation, methylene blue, adsorption
Nationell ämneskategori
Materialkemi
Forskningsämne
materialkemi
Identifikatorer
urn:nbn:se:su:diva-107672 (URN)978-91-7447-994-2 (ISBN)
Disputation
2014-11-18, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
Berzelii Centre EXSELENT
Anmärkning

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 1: In press.

Tillgänglig från: 2014-10-27 Skapad: 2014-09-23 Senast uppdaterad: 2015-05-07Bibliografiskt granskad
2. Structuring porous adsorbents and composites for gas separation and odor removal
Öppna denna publikation i ny flik eller fönster >>Structuring porous adsorbents and composites for gas separation and odor removal
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Porous zeolite, carbon and aluminophosphate powders have been colloidally assembled and post-processed in the form of monoliths, flexible free standing films and coatings for gas separation and odor removal. Zeolite 13X monoliths with macroporosites up to 50 vol% and a high CO2 uptake were prepared by colloidal processing and sacrificial templating. The durability of silicalite-I supports produced in a binder-free form by pulsed current processing (PCP) were compared with silicalite-I supports produced using clay-binders and conventional thermal treatment. Long-term acid and alkali treatment of the silicalite-I substrates resulted in removal of the clay binder and broadened the size-distribution of the interparticle macropores. Furthermore, strong discs of hydrothermally treated beer waste (HTC-BW) were produced by PCP and the discs were activated by physical activation in CO2 at high temperatures. The activated carbon discs showed high strength up to 7.2 MPa while containing large volume of porosities at all length scales. PCP was further used to structure aluminomphosphate powders (AlPO4-17 and AlPO4-53) into strong functional monoliths. The aluminophosphate monoliths had strengths of 1 MPa, high CO2 uptake and were easy to regenerate. Zeolite Y, silicalite and ZSM5 were selected as potential zeolite adsorbents for removal of sulfur containing compound, e.g. ethyl mercaptan (EM) and propyl mercaptan (PM). A novel processing procedure was used to fabricate free-standing films and coatings of cellulose nanofibrils (CNF) with a high content of nanoporous zeolite; 89 w/w% and 96 w/w%, respectively. Thin flexible free-standing films and coatings of zeolite-CNF on paperboards with thickness around 100 µm and 40 µm, respectively, were produced. Headspace solid phase microextraction (SPME) coupled to gas chromatography- mass spectroscopy (GC/MS) analysis showed that the zeolite-CNF films can efficiently remove considerable amount of odors below concentration levels that can be sensed by the human olfactory system.

Ort, förlag, år, upplaga, sidor
Stockholm, Sweden: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2014. s. 62
Nyckelord
Structure, pulsed current processing, zeolite, aluminophosphate, activated carbon, CO2 separation, adsorption, durability, cellulose, film, coating
Nationell ämneskategori
Materialkemi
Forskningsämne
materialkemi
Identifikatorer
urn:nbn:se:su:diva-109179 (URN)978-91-7649-005-1 (ISBN)
Disputation
2014-12-16, Magnélisalen, Arrhenius Laboratory, Svante Arrhenius väg 16 B, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 5: Manuscript.

Tillgänglig från: 2014-11-24 Skapad: 2014-11-14 Senast uppdaterad: 2018-04-27Bibliografiskt granskad

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Hao, WenmingKeshavarzi, NedaBergström, LennartHedin, Niklas
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Institutionen för material- och miljökemi (MMK)
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