1 Introduction</h5> Dynamic development of industry and fast growing urbanisation are responsible for rapid pollution of the natural environment. To counteract this phenomenon, legal regulations concerning admissible levels of emission of particular compounds are increasingly restrictive, which has stimulated research work on new technologies aimed at removal of pollutants and contaminants. According to one possible approach, the industry should limit production of harmful substances by introducing new, the so-called pure technologies. Another approach is directed at purification of exhaust gases and wastewater by adsorption, absorption or by catalytic methods [1–3] .</P>Wastewater containing dyes are usually the most difficult to treat due to the complex aromatic structures of dyes which make them physicochemically and thermally stable. Because of the toxic, carcinogenic and mutagenic properties of dyes, the presence of even a small amount of a synthetic dye in the natural aquatic streams is a serious health-risk factor [4,5] . Among these dyes, the azo ones make the largest and most versatile class of coloured compounds used in the textile, pharmaceutical, food and cosmetic industries [6–12] . Their characteristic feature is the presence of nitrogen to nitrogen double bonds and they are a major source of aromatic amines. In terms
Chemical Engineering Journal – Elsevier
Published: Jun 15, 2015
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