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Projects / Programmes source: ARIS

Alternative bleaching agents

Research activity

Code Science Field Subfield
2.14.00  Engineering sciences and technologies  Textile and leather   

Code Science Field
T470  Technological sciences  Textiles technology 
Keywords
oxidation, bleaching, hydrogen peroxide, peracetic acid, cellulosic fibres, cotton, polymers, depolymerization, activators, catalysts, stabilisers, enzymes, pectinases, catalases, cellulases, amylases, ecology
Evaluation (rules)
source: COBISS
Researchers (20)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  11411  PhD Sabina Bračko  Communications technology  Researcher  2005 - 2008  253 
2.  22367  PhD Lidija Černe Hočevar  Textile and leather  Researcher  2005 - 2007  57 
3.  19880  PhD Sabina Fijan  Microbiology and immunology  Researcher  2005  425 
4.  11766  PhD Petra Eva Forte Tavčer  Textile and leather  Head  2005 - 2008  391 
5.  29378  PhD Barbara Golja  Textile and leather  Junior researcher  2008  60 
6.  01310  PhD Marija Gorenšek  Textile and leather  Researcher  2005 - 2008  298 
7.  08610  PhD Diana Gregor Svetec  Communications technology  Researcher  2005 - 2008  703 
8.  19706  PhD Mateja Kert  Textile and leather  Researcher  2005 - 2008  161 
9.  20045  PhD Petra Kovačič  Textile and leather  Researcher  2006 - 2008  43 
10.  23481  PhD Pavla Križman Lavrič  Textile and leather  Researcher  2005 - 2008  33 
11.  24022  PhD Mirjam Leskovšek  Textile and leather  Researcher  2005 - 2008  76 
12.  18610  Zdenka Lindič    Technical associate  2005 - 2007 
13.  05537  PhD Branko Neral  Textile and leather  Researcher  2005 - 2008  326 
14.  29877  Branka Perc  Textile and leather  Technical associate  2008  16 
15.  22365  PhD Polonca Preša  Textile and leather  Researcher  2005 - 2007  31 
16.  08304  PhD Tatjana Rijavec  Textile and leather  Researcher  2005 - 2008  357 
17.  08393  PhD Barbara Simončič  Textile and leather  Researcher  2005 - 2008  495 
18.  06095  PhD Sonja Šostar - Turk  Textile and leather  Researcher  2005  843 
19.  25457  PhD Brigita Tomšič  Textile and leather  Junior researcher  2005 - 2008  250 
20.  24254  PhD Urška Vrabič Brodnjak  Communications technology  Junior researcher  2005 - 2008  343 
Organisations (2)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0795  University ob Maribor, Faculty of mechanical engineering  Maribor  5089638010  23,913 
2.  1555  University of Ljubljana, Faculty of Natural Sciences and Engeneering  Ljubljana  1627074  19,855 
Abstract
Peracetic acid and other peracids are efficient bleaching agents. PAA can be used for bleaching of natural cellulose fibres. In contrast to hydrogen peroxide it acts at low temperatures and in neutral to slightly alkaline medium. For optimal exploitation of PAA, which would lead to high degree of whiteness without damaging of fibres, it is necessary to look into the mechanisms and kinetics of PAA consumption and decomposition during the bleaching process. The influence of temperature, pH, different activators, catalysts and stabilizers on the consumption and decomposition of equilibrium PAA in the presence of cotton fibres and in the PAA solution without fibres will be followed. As activators different alkalis, metallic complexes and cationic bleaching activators will be used, as catalyst different metallic salts and oxides, and as stabilizers buffering salts and complexing agents. Bleaching with equilibrium PAA will be compared to bleaching with PAA, produced in situ from hydrogen peroxide and peracid precursors like NOBS and TAED. The possibility of decomposition of residual oxidants with enzymes and other catalysts will be investigated. The feasibillity of combining the PAA with enzymes pectinases, amylases and cellulayses in the bleaching/scouring procedures will be studied and the effects of such treatments on the degree of whiteness, water absorbency and fibre damage of cotton fabrics will be investigated. The quantity of used water and energy and the waste water loading will be measured and compared to conventional one-bath treatments of cotton. The alterations of the surface of fibres treated in different procedures will be observed with scanning electron microscope (SEM), the alterations of functional groups will be determined by FTIR spectroscopy, the depolymerisation of cellulose will be measured with the viscosimetric method in cuoxam, the quantity of calcium, magnesium and iron on the fibres will be measured with the atomic absorption spectroscopy and titrimetric. Calcium, magnesium and iron are namely the indicators of pectins and other incrusts on the fibres. Iron and other metallic ions are the catalysts of the decomposition of PAA and hydrogen peroxide.
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