Sökning: "blekning"

Visar resultat 1 - 5 av 8 avhandlingar innehållade ordet blekning.

1. 1. Sol-gel Synthesis and Photocatalytic Characterization of Immobilized TiO2 Films

   Författare :Haidong Liao; Mats Jonsson; David Stenman; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Photocatalysis; Hydroxyl radical; TiO2 film; Sol-gel; Chemistry; Kemi; Catalysis; Katalys;

   Sammanfattning :    Contamination of surface and ground water from industrial wastes and anthropogenic activities represents one of the greatest challenges to the sustainable development of human society. Heterogeneous photocatalysis, a kind of advanced oxidation process characterized by the production of highly oxidative hydroxyl radicals, is a relatively novel subject with tremendous potential in water treatment applications. LÄS MER

3. 2. Pulp strength enhancement by oxygen delignification

   Författare :Claudia Esteves; Elisabet Brännvall; Olena Sevastyanova; Sören Östlund; Christine Chirat; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fiber charge; morphology; oxygen delignification; swellability; tensile properties; dragegenskaper; fiberladdningar; morfologi; svällningsförmåga; syrgasdelignifiering; Chemical Engineering; Kemiteknik;

   Sammanfattning : Oxygen delignification is widely used in the pulp and paper industry as a part of delignification process between the kraft cook and bleaching. However, its potential has not been fully utilized. LÄS MER

4. 3. Optical Functionalization of Transparent Wood Biocomposites

   Författare :Martin Höglund; Lars Berglund; Sergei Popov; Jonsson Magnus; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; transparent wood; biocomposite; optical scattering; interfaces; dye laser; organic dye; plasmonic; nanoparticle;

   Sammanfattning : Transparent wood (TW) biocomposites combines load-bearing properties with high transmittance of light. TW consists of a reinforcing wood substrate that has been infiltrated with a polymer matrix. TW can be combined with additives so that new multifunctional materials are obtained. LÄS MER

5. 4. Extraction of Lignin from Kraft Cooking Liquor by Ultrafiltration

   Författare :Ola Wallberg; Avdelningen för kemiteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; lignin; Chemical technology and engineering; cooking liquor; kraft black liquor; Kemiteknik och kemisk teknologi; Ultrafiltration;

   Sammanfattning : Lignin is a potential biofuel which can be extracted from kraft cooking liquor. Lignin can also prove valuable as a speciality chemical. By extracting lignin potential economical revenue can be gained by pulp mills, as well as technical benefits such as easier delignification and bleaching. LÄS MER

7. 5. Xylan degradation by the thermophilic bacterium Rhodothermus marinus. Characterization and function of a thermostable xylanase

   Författare :Eva Nordberg Karlsson; Bioteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fed-batch cultivation; kraft pulp; bleaching; glycosyl hydrolase family 10; recombinant xylanase; polysaccharide binding domain; Biotechnology; Bioteknik;

   Sammanfattning : A gene encoding a multidomain xylanase from the thermophilic bacterium Rhodothermus marinus has been cloned, sequenced and produced in Escherichia coli . The gene product was found to be a 109 kDa protein consisting of five domains. LÄS MER