search query: @keyword vetyperoksidi / total: 9
reference: 5 / 9
Author: | Saastamoinen, Maija |
Title: | Chemical Stability of Printing Ink Colourants |
Painoväriaineiden kemiallinen pysyvyys | |
Publication type: | Master's thesis |
Publication year: | 2007 |
Pages: | iv + 110 s. + liitt. 15 Language: eng |
Department/School: | Puunjalostustekniikan osasto |
Main subject: | Puunjalostuksen kemia (Puu-19) |
Supervisor: | Vuorinen, Tapani |
Instructor: | Sahivirta, Jukka |
OEVS: | Electronic archive copy is available via Aalto Thesis Database.
Instructions Reading digital theses in the closed network of the Aalto University Harald Herlin Learning CentreIn the closed network of Learning Centre you can read digital and digitized theses not available in the open network. The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/ You can read theses on the Learning Centre customer computers, which are available on all floors.
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Location: | P1 Ark TKK 450 | Archive |
Keywords: | colourant decolourization ozone peracetic acid hydrogen peroxide väriaine värinpoisto otsoni peretikkahappo vetyperoksidi |
Abstract (eng): | This thesis is a preliminary study of decolourizing printing ink colourants with oxygen-based bleaching chemicals. To understand the bases for the discussion, the literature part reviews printing technologies, printing inks, printing ink colourants, colour chemistry and oxygen-based bleaching chemicals. These all serve as a background and help in following the reactions of colourants and oxygen-based bleaching chemicals, which are the focus of the literature part and the thesis. The experimental part handles the stability of the printing ink colourants throughout the decomposition of two printing ink colourants (Pigment Yellow 138 and Pigment Blue 15) with peracetic acid and ozone. The literature review clarified that the reactions between colourants and oxygen-based bleaching chemicals are mostly unknown. Nonetheless, the reaction kinetics of decolourization of azo dyes in textile wastewaters were highly examined with various advanced oxidation processes (AOPs). In general, these studies included decolourization of dye with a strong oxidising agent (ozone, hydrogen peroxide) and / or catalysts (Fe2+) in the presence or absence of an irradiation source (UV radiation). According to the publications, ozonation was seen as the most potential alternative for colour removal in textile water industries: the majority of the ozonation studies reviewed, indicated complete colour removal. The mass transfer, pH, ozone dose and concentration of the colourant were determined as the most important variables of ozonation. Even though the decolourization of textile colourants is not directly applicable for printing ink colourants, the review established the powerful opportunities of colour removal with AOPs. The results of the experimental part indicated that Pigment Yellow 138 and Pigment Blue 15 were remarkably stable. Nevertheless, Pigment yellow 138 could be partly decolourized with peracetic acid and Pigment Blue 15 almost completely with ozone. However, the results did not promote further studies in the chosen experimental conditions. In conclusion, the findings of the literature review demonstrated promising results and, indeed, strongly defended the potential abilities of AOPs in colour removal. Thus, this study encourages to further explore the decolourization of printing ink colourants with oxygen-based bleaching chemicals, especially with ozone. |
ED: | 2007-01-26 |
INSSI record number: 32955
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