Methylene blue (MB) is a cationic dye of phenothiazine salt widely used as a chemical indicator, dye, biological stain, and drug manufacturing [1,2].In developing countries, the production of dyestuffs is steadily increasing every year. The textile, pharmaceutical, leather, food processing, cosmetic and coating industries discharge more than 800,000t of various dyestuff wastewater annually, accounting for about 10% to 15% of the total [3]. Without proper treatment, these toxic, mutagenic, and carcinogenic dyes can harm the environment and marine life and seriously threaten human health [4,5]. For example,

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