Color Dyes and Adsorbents Essays

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Acid-Base Properties of Natural Adsorbents of Synthetic Dyes
Rada-Mayya Kostadinova
Dyes are synthetic, water-soluble and dispersible organic compounds, which cause coloration of natural water bodies when released into the environment. They are widely used in industries such as dyestuff, textiles, rubber, leather, paper, plastics, cosmetics etc., to color their products and are invariably left in the industrial wastes. Synthetic dyes, suspended solids and dissolved organics are the main hazardous materials found in textile effluents. These materials can affect the physical and chemical properties of fresh water. In addition to the undesirable colors of textile effluents, some dyes may degrade to produce
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All these adsorbents share a common characteristic, they all derive from cellulose. They are plant-based materials and contain polysaccharides as their structural skeleton. The literature offers many alternatives but only few have been dedicated to the study of leaves as adsorbents of pollutants in general8. Green tea (GT) and Peppermint Tea (PM) bags are good candidates for this purpose. They are sold in their pure state (not as a mixture of other herbs) and come in small particles (avoiding grinding and sieving treatment). They both have a very important characteristic, after brewing; they are thrown to the garbage and are considered domestic waste.
The dyes that were studied in this project were selected based on their wide-spread use in the cosmetics market and research (Figure 1). Discharge of Crystal Violet (CV) into the hydrosphere can cause environmental degradation, because CV is readily absorbed into fish tissue from water exposure and is metabolically taken by fish. It has also been linked to increased risk of human bladder cancer. CV induces renal, hepatic and lung tumor in mice. CV is also a mutagen and mitotic poison8. On the other hand, Basic Yellow 57 (BY57) and Basic Blue dye 99 (BB99) are hair dyes that are ingredients for hair coloration and are present in hair dyes industries. We believe that the proposal of new alternatives for the treatment of their waste waters could be of their

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