Tehran University of Medical Sciences Journal of Food Safety and Hygiene 2476-3241 7 2 2022 01 13 97 109 Daryoush Sanaei Department of Environmental Health Engineering, Faculty of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran Ali Salehi Environmental Health Engineering Dept. Food Hygiene & Safety Division, School of Public Health, Tehran University of Medical Sciences, Tehran Ebrahim Molaee-aghaee Division of Food Safety and Hygiene, Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran Nabi Shariatifar Environmental Health Engineering Dept. Food Hygiene & Safety Division, School of Public Health, Tehran University of Medical Sciences, Tehran 2021 11 02 2021 11 10 Due to the discharge of the effluent containing rich-nutrient matters such as phosphate into water bodies, some of the problems including eutrophication created that created adverse environmental impacts. Hence, we prepared a new Fe-doped coconut fiber coir-based biochar (Fe-CFCB) as an effective adsorbent for adsorbing phosphate from an aqueous solution. According to characteristics results, the amorphous structure besides the presence of ferrihydrite and hydroxide confirmed in the Fe-CFCB, enhances the phosphate adsorption. The pH and Temperature are played the main roles in phosphate adsorption by Fe-CFCB, according to batch experimental. the experimental data and before/after adsorption characteristics appeared that the electrostatic attraction, chemical precipitation, and complexation could be considered as main mechanisms of adsorption P by Fe-CFCB. The newly prepared adsorbent could reveal a feasible pathway for phosphate removal from an aqueous solution and also could consider an effective and eco-friendly adsorbent for the removal of wide ranges of pollutants in the future.  https://jfsh.tums.ac.ir/index.php/jfsh/article/view/337 https://jfsh.tums.ac.ir/index.php/jfsh/article/download/337/168