The most abundant pollutants of water are dye materials. Dyes are widely used in the textile, leather, paper, painting, and plastics industries. Around 100,000 commercially available dyes are produced, at a rate of 7 × 105 tons per year [20] and [90], and 2% of the dyes produced are usually discharged into aquatic systems as effluents [20] and [90]. These effluents contain a number of hazardous organic compounds and toxic substances, which are harmful to fish and other aquatic organisms. Some dyes are also considered to be carcinogenic, and may cause acute or chronic diseases in exposed organisms [91]. Moreover, the sunlight entering the water can be absorbed or reflected by dyes, which retard the growth of bacteria that become inefficient to degrade impurities in water [92] and [93].