Development of environment-friendly natural adsorbents to treat heavy metal, contaminated wastewater stands as a foremost area of investigation, due to its less price and environment-friendly nature. In the present experimental investigations� adsorption of iron against aqueous mixture by means of chemically activated coconut shell is studied in batchwise. Adsorption capability in elimination of iron metal ion has been examined by various influencing criteria such as pH, time of contact, agitation speed, initial ion concentration and adsorbent dosages. This study is done to find a cost-efficient adsorbent as well as understand the process aimed at removal of heavy metal in wastewater with the aid of the natural adsorbent. Activated carbon prepared from coconut shell is made using chemical activation technique. Experimental results showed that the adsorption rate relies on size of pores, surface area, amount of the chemically activated carbon. Therefore, chemically activated carbon will turn out to be a decent adsorbent for adsorption of CO2 against flue gas and wastewater treatment. Kinetic study showed that the elimination efficiency and adsorption rate remain greatly reliant on concentration of adsorbent, time of agitation and initial ion concentration. Iron adsorption is figured to be reliant on pH, and maximum elimination is observed at pH 7�8. The maximum elimination of metal ion is figured with adsorbent dosage of 0.5 g, contact time of 90 min and speed of agitation of 300 rpm. Experimental information closely fitted with Freundlich isotherm and adsorption exhibited a pseudo-second-order reaction mechanism. © 2020, Islamic Azad University (IAU).