en عمومى General مقاله اصیل Original Article <div style="text-align: justify;">Background: Heavy metal pollution has become one of the most severe environmental problems, therefore, the present study was conducted to investigate removal of cadmium (Cd) from aqueous solution.<br> Methods: In the present study, nano Prosopis cineraria leaf ash (NPCLA) was used as an adsorbent for removing Cd from aqueous solution. Contact time, initial pH of the solutions, sorbent dosages, and initial Cd (II) concentration were considered as parameters affecting Cd removal efficiency. The experiments were designed by Design of Expert (DOE) software.<br> Results: It was revealed that an NPCLA dosage of 2.45 gL-1, pH of 6.3, and initial Cd (II) concentration of 20.7 mgL-1 in contact time of 60 min was the optimum condition for removal of Cd (II) in the domain of experiments and at this optimum condition, the prediction value of removal efficiency was found 99.9%. Based on the results of kinetics experiments, the sorption system and experiment data of Cd (II) adsorption on the NPCLA followed the pseudo-second-order kinetic model. Freundlich, Langmuir, Brunauer-Emmett-Teller (BET), and Temkin isotherm models were investigated. The equilibrium adsorption data were fitted well with linearly transformed Langmuir isotherm with a correlation coefficient of R2 = 0.9877, and the maximum sorption capacity of NPCLA was obtained to be 25.25 mgg-1.<br> Conclusion: In laboratory conditions, NPCLA can remove Cd from aqueous solution with a high efficiency. Therefore, due to this plant&rsquo;s availability and cheapness, NPCLA can be considered a suitable option for producing adsorbents on industrial scales.<br> <br> <br> <br> <br> &nbsp;&nbsp;</div> Cadmium, Hydrogen-ion concentration, Nanostructure, Plant leaves, Kinetics 225 233 http://ehemj.com/browse.php?a_code=A-10-1-289&slc_lang=en&sid=1 Milad Pourjaafar pourjaafar@gmail.com 100319475328460013575 100319475328460013575 No Department of Chemical Engineering- HSE, Abadan Institute of Technology, Abadan, Iran, HSE Manager Department, North Azadegan Oilfield Project, Khuzestan, Iran Ali Askari a-askari@razi.tums.ac.ir 100319475328460013576 100319475328460013576 No Department of Occupational Health, School of Public Health, Tehran University of Medical Sciences, OICO HSE Department, Azar Oilfield Project, Ilam, Iran Ali Salehi Sahl Abadi asalehi529@sbmu.ac.ir 100319475328460013577 100319475328460013577 Yes Corresponding author: Department of Occupational Health and Safety Engineering, School of Public Health and Safety, Shahid Beheshti University of Medical Sciences, Tehran, Iran Bagher Anvaripour anvaripour.put.ac@gmail.com 100319475328460013578 100319475328460013578 No Department of Chemical Engineering- HSE, Abadan Institute of Technology, Abadan, Iran, HSE Manager Department, North Azadegan Oilfield Project, Khuzestan, Iran Afshar Nemati anemati@oico.ir 100319475328460013579 100319475328460013579 No OICO Azar Oilfield Development Site Manager, Azar Oilfield Project, Ilam, Iran Seyed Ali Rahimi rahimi.seyedali@gmail.com 100319475328460013580 100319475328460013580 No Department of Chemical Engineering- HSE, Abadan Institute of Technology, Abadan, Iran, HSE Manager Department, North Azadegan Oilfield Project, Khuzestan, Iran Mona Pourjafar pa_saipa@yahoo.com 100319475328460013581 100319475328460013581 No Department of Chemical Engineering- HSE, Abadan Institute of Technology, Abadan, Iran, HSE Manager Department, North Azadegan Oilfield Project, Khuzestan, Iran