Rubber fruit shell: agricultural waste material as a potential sustainable production for wastewater treatment

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Water quality is a problem in recent decades, rubber fruit shell in agricultural waste will be a solution to solve wastewater treatment. Rubber fruit shell has dried by sunshine for three days and crushed using crusher until the material becomes ash, ash has sifted in 80 and 120 mesh. Ash burned in 400°C and 500°C, ash has activated use acid activator (H3PO4) 10% for 24 hours, and then carbon cleaned by aquadest till the pH is seven. Then, carbon has dried in oven for 3 hours with temperature 110°C. Specification test using gravimetric method has used to find water concentration and ash content in rubber fruit shell. Titration test used to find adsorption of iodine (mg/g), spectrophotometry UV-VIS used to find adsorption of blue methylene with a wavelength of 560.50 nm, blue methylene has used too for finding a surface area. Freundlich and Langmuir isotherm model has used to find best isotherm model. The isotherm model suitable for adsorption this time is the Freundlich isotherm model because it has a linear line equation that is y = 0.4784x + 3.3971 with the correlation coefficient (r) is 0.9922