Industrial dye degradation

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Common industrial dyes of varying colors and types.

Industrial dye degradation is any of a number of processed by which dyes are broken down, ideally into innocuous products.[1] Many dyes, specifically in the textile industry such as methylene blue or methyl red, are released into ecosystems through water waste.[2] Many of these dyes can be carcinogenic. In paper recycling dyes can be removed from fibres during a deinking stage prior to degradation.

Methods

Standard photocatalysis set-up

Heterogeneous photocataylsis is one approach to the degradation of dyes.[3]

As applied to dye-containing effluents from the

Fenton chemistry. One challenge is that oxidants can be indiscriminent such that large amounts of reagents can be required (see Chemical oxygen demand). One promising approach combines oxidation with photocatalysis.[5] Reduction is also employed, a standard reagent being dithionite, which traditionally affords leuco dyes. Precipitation, often coupled with flocculation
, is yet another approach, although it can produce substantial quantities of solids.

References

  1. doi:10.1016/j.cej.2009.02.026
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  2. ^ Huang, C.; Y. Huang; H. Cheng; Y. Huang. Kinetic Study of an Immobilized Iron Oxide for Catalytic Degradation of Azo Dye Reactive Black B with Catalytic Decomposition of Hydrogen Peroxide. Catalysis Communications 2009, 10 (5), 561-566.
  3. ^ Pandit, V.K.; Arbuj, S.S.; Pandit, Y.B.; Naik, S.D.; Rane, S.B.; Mulik, U.P.; Gosavic, S.W.; Kale, B.B. Solar Light driven Dye Degradation using novel Organo–Inorganic (6,13-Pentacenequinone/TiO2) Nanocomposite”. RSC Adv. 2015, 5, 10326-10331.
  4. ISBN 9783527306732
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  5. S2CID 198742844
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