Activated carbon adsorption / Adsorption / Activated Carbon / (i) Adsorption study: Removal of organic and inorganic pollutants by inexpensive adsorbents / Adsorption and wastewater treatment / Activated carbon preparation / Methylene Blue / Biodesel, Iodine Number / Researching the potential of water hyacinth ash in the form of charcoal for phenol adsorption / Activated carbon preparation / Methylene Blue / Biodesel, Iodine Number / Researching the potential of water hyacinth ash in the form of charcoal for phenol adsorption