Povzetek
This article gives a summary of the most commonly used ecologically unfriendly processes for the reduction and oxidation of vat and sulphur dyes. It also describes the new alternatives that are in the development stage and could be important in the near future. Sodium dithionite as the dominant reducing agent produces large amounts of sodium sulphate, and also toxic sulphite and thiosulphate as by-products. Consequently, high amounts of hydrogen peroxide and alkali are required for the treatment of effluents, which add to the cost of the process. Attempts have been made to use organic biodegradable reducing agents, enzymes, catalytic hydrogenation, and also indirect or direct, electrochemical reductive methods that employ a redox mediator (electron-carrier). The reduction has also been carried out via the dye radical molecule or, in the case of indigo, by direct electrochemical reduction using graphite as the electrode material. Physical techniques, for example using ultrasound, magnetic fields or UV have been shown to be effective only when used to accelerate methods using classical reduction and oxidation processes. However, although these methods offer some environmental benefits, there is still no satisfactory alternative reducing and/or oxidising agent available today.
Ključne besede
textile dyeing;vat dyes;sulphur dyes;reduction;oxidation;catalysis;ecology;organic agents;electrochemistry;ultrasound;magnetic field;UV application;biotechnology;
Podatki
Jezik: |
Angleški jezik |
Leto izida: |
2008 |
Tipologija: |
1.02 - Pregledni znanstveni članek |
Organizacija: |
UM FS - Fakulteta za strojništvo |
UDK: |
677.027.4:628.3 |
COBISS: |
11060246
|
ISSN: |
0143-7208 |
Št. ogledov: |
2315 |
Št. prenosov: |
103 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarne ključne besede: |
barvanje tekstilij;redukcijska barvila;žveplova barvila;redukcija;oksidacija;kataliza;ekologija;organski dodatki;elektrokemija;ultrazvok;magnetno polje;uporaba UV;biotehnologija; |
URN: |
URN:SI:UM: |
Strani: |
str. 299-309 |
Letnik: |
ǂVol. ǂ76 |
Zvezek: |
ǂiss. ǂ2 |
Čas izdaje: |
2008 |
ID: |
8718572 |