On inhalation, it can give rise to short periods of rapid or difficult breathing, while ingestion through the mouth produces a burning sensation and may cause nausea, vomiting,
diarrhea, and gastritis. A large amount creates abdominal and chest pain, severe headache, profuse
sweating, mental confusion, painful micturition, and methemoglobinemia-like syndromes [4]. Therefore,
removal of Methylene blue from wastewater is most desirable. A range of conventional treatment
technologies for dye removal have been investigated extensively, such as biological treatment, adsorption,
chemical oxidation, coagulation, and reverse osmosis [5]. Adsorption was found to be superior to other
techniques for water re-use in terms of simplicity of design, ease of operation and insensitivity to toxic
substances [6]. Although Granular activated carbon has been designated by the Environmental Protection
Agency of USA as the best available technology for organic chemicals removal, it is still considered
expensive adsorbent and the higher the quality the greater the cost. Both chemical and thermal
regeneration of spent carbon is expensive, impractical on a large-scale and produces additional effluent
and results in considerable loss of the adsorbent. This has led many workers to search for the use of cheap
and efficient alternative materials [7]. These include spent corncob substrate [8]; pomelo (Citrus grandis)
peel [9]; Luffa cylindrica fibers [10]; sunflower seed shells [11]; olive pomace [12]; Posidonia oceanica
(L.) fibres [13]; wheat shells [14]; palm kernel fibre [15] and phoenix tree’s leaves [16] .