en تخصصي Special Original articles <p style="margin-bottom: 0.0001pt; line-height: 115%; direction: ltr; unicode-bidi: embed; text-align: justify;"><strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Introduction:</span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> Di (2-ethylhexyl) phthalate is one of the most abundant phthalate esters and it is widely used as softeners in plastic products.</span></span> <span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Malformation, carcinogenicity, the poisoning of the reproductive system, and also the disruption of the human endocrine system are the harmful effects of these substances. </span></span><br> <strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Materials and Methods:</span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> In this research, the removal of di (2-ethylhexyl) phthalate from aqueous solutions by cellulose nanofiber non-continuous was studied. The effects of some variables such as the initial concentration of the di (2-ethylhexyl) phthalate, the adsorbent dosage, the contact time, and the pH at room temperature were tested. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetic data. furthermore, the Freundlich and Langmuir adsorption models were tested based on the optimum conditions. </span></span><br> <strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Results:</span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> The results indicated that the adsorption of di (2-ethylhexyl) phthalate follows the pseudo-second-order kinetic model (R² &nbsp;=&nbsp; 0.9674) and the Langmuir isotherm (R² = 0.9573). </span></span><br> <strong><em><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;">Conclusion:</span></span></em></strong><span style="font-family:times new roman,serif;"><span style="font-size:10.0pt;"> Due to the high adsorption capacity of the cellulose nano fiber (312.5 mg/gr), it can be concluded that it is an appropriate adsorbent for removal of di (2-ethylhexyl) phthalate from aqueous solutions.&nbsp;</span></span></p> Diethylhexyl Phthalate, Nano Cellulose, Aqueous Solutions,Adsorption Kinetic 273 283 http://jehsd.ssu.ac.ir/browse.php?a_code=A-10-1-34&slc_lang=en&sid=1 Sima Makzoom No Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran, and Student Research Center and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran. Nezamaldin Mangolizade No Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran, and Student Research Center and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran. Tayebe Kalte No Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran, and Student Research Center and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran. Pegah Salehi No Environment Research Center, Isfahan University of Medical Sciences, Isfahan, Iran, and Student Research Center and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran. Hamidreza Pourzamani pourzamani@hlth.mui.ac.ir Yes Environment Research Center, Research Institute for Primordial Prevention of Non-communicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran, and Department of Environmental Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.