Molybdenum (Mo) has applications in many pharmaceutical and biological samples 1. Mo is an economically silvery-white transition metal which has five oxidation states from (+2) to (+6) with an atomic number of 42 and an atomic mass of 96 2, 3. Mo is a bio-essential metal for humans, animals, and plants. It has relatively low toxicity because of a component or co-factor of enzymes which are important for life, so without Mo, organisms can’t work and will show signs of deficiency 2-5. Metallic Mo offers many advantages like good corrosion resistance, excellent mechanical, thermal, electrical properties, high temperature and its melting point (2883 K) due to the low coefficient of its high thermal expansion and conductivity. These excellent properties make it can be used in electronics, metallurgy, aerospace and electrical industries 6-9.
Biosorbent is a biological origin solid system from bacterial, fungal, plant or animal origin 10. It has several functional groups such as carboxyl, ether, carbonyl, hydroxyl, and ester groups and more effective alternatives for metal ions sorption (e.g Mo) from aqueous solution 11-16. Adsorption using a cheap, abundant and environmental-friendly adsorbent originated from a plant such as an olive tree (Olea Europea). It has an effective substitute as is the simplest and most useful method 17, 18.
Its common name was for about 35 species of evergreen shrubs and trees in the olive family of the genus Olea which has varieties of parts such as fruit, leaves, and oil. The olive tree was domesticated trees in the family Oleaceae cultivated by man for more than 5500 years ago. Olive trees native to the Medial East, Egypt, Palestine, Jordon, Syria, Africa and Asia. They have many varieties that exhibit major or minor phenotypical and genetic differences 19-23.