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Removal of Methylene Blue from Its Aqueous Solution using Bark of Pinus roxburghii as an Adsorbent

Mahesh Chandra Arya1, Rakesh Chandra Joshi1, Rajesh Kumar1, Shah Raj Ali1 and Sharanappa K. Kadabinakatti2

1. Chemistry Department, DSB Campus, Kumaun University, Nainital, Uttarakhand 263002, India

2. Department of Biochemistry, JSS College, University of Mysore, Mysore, Karnataka 570025, India


Abstract: This work explores the potential of activated bark powder of Pinus roxburghii as an adsorbent for the removal of methylene blue dye from its aqueous solution. Pinus roxburghii, also known as chir pine, is a species of Pine, native to the Himalaya. Pine bark is a solid waste of tree which chiefly contains lignin, cellulose and tannin. The adsorbent was prepared by grounding oven-dried barks of P. roxburghii and sieving the powder through the mesh of different sizes (150 µm, 300 µm and 500 µm). The adsorbent was activated by heating it at 100 °C for suitable time. Effect of pH, contact time between adsorbate and adsorbent, size of particles of adsorbent and adsorption isotherm are the variables which have been studied for this adsorption. The experiments reveal it can show efficiency as high as 94% at optimum pH of 6.5 and contact time of 300 min. The work proves that pine bark powder is an efficient adsorbent material for the removal of methylene blue and its efficiency can further be improved by its activation.

Key words: Methylene blue, adsorption, pine bark.
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