en عمومى General پژوهشي Research <p dir="ltr"><strong>Background:</strong> This study aimed to investigate the biosorption of pentachlorophenol on <em>Aspergillus niger</em> biomass as a method for removal of pentachlorophenol from aqueous solutions.</p> <p dir="ltr"><strong>Methods:</strong> Modified <em>A. niger</em> biomass with NaOH was used to absorb the pentachlorophenol. The impacts of various experimental parameters like primary pentachlorophenol concentration, pH of the solution, contact time, and biomass dosage on the biosorption of pentachlorophenol were investigated.</p> <p dir="ltr"><strong>Results:</strong> The correlation of contact time, pH and initial concentration with the biosorption of pentachlorophenol by <em>A. niger</em> biomass was statistically significant (<em>P</em><0.001). Pentachlorophenol removal increased with decreasing pH of the solution and the maximum efficiency was obtained at pH=3. The equilibrium adsorption capacity was increased from 4.23 to 11.65 mg/g by increasing initial pentachlorophenol concentration from 10 to 40 mg/L, while pentachlorophenol removal efficiency decreased from 87 to 55%. Both Langmuir and Freundlich isotherms efficiently described adsorption equilibrium of pentachlorophenol on <em>A. niger</em> biomass. Correlation coefficients for the second order kinetic model were almost equal to one.</p> <p dir="ltr"><strong>Conclusion:</strong> <em>A. niger</em> biomass can be used to reduce the toxicity of aqueous solutions containing pentachlorophenol in acidic pH conditions.</p> Absorption, Aspergillus niger, Carcinogenic, Pentachlorophenol 33 39 http://ijt.arakmu.ac.ir/browse.php?a_code=A-10-337-1&slc_lang=en&sid=1 Reza Shokoohi رضا شکوهی 100319475328460011194 100319475328460011194 No Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamedan, Iran. انشگاه علوم پزشکی همدان Salah Azizi صلاح عزیزی 100319475328460011195 100319475328460011195 No M.Sc of Environmental Health Engineering, Student Research Center, Hamadan University of Medical Sciences, Hamedan, Iran. دانشگاه علوم پزشکی همدان Seyed Amir Ghiasian سید امیر قیاثیان s.a.ghiasian@umsha.ac.ir 100319475328460011196 100319475328460011196 Yes Department of Mycology and Parasitology, Hamadan University of Medical Sciences, Hamedan, Iran. دانشگاه علوم پزشکی همدان Ali Poormohammadi علی پورمحمدی 100319475328460011197 100319475328460011197 No Ph.D. by Research Student of Environmental Health Engineering, Social Development and Health Promotion Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran. دانشگاه علوم پزشکی همدان