Iranian Research Organization for Science and Technology Advances in Environmental Technology 2476-6674 5 1 2019 01 01 Fast and environmental-friendly degradation of tert-butyl mercaptan from contaminated soil using bimetallic-modified Fenton process 9 21 857 10.22104/aet.2019.3561.1176 EN Pejman Roohi Environmental Engineering Research Center (EERC), Faculty of Chemical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran Esmaeil Fatehifar Faculty of Chemical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran Journal Article 2019 04 21 In this work, the fast remediation of <em>tert</em>-butyl mercaptan from the polluted soil via a bimetallic Fenton treatment that included Fe²⁺/Fe³⁺/Fe⁰/Cu²⁺ in the presence of gasoline was studied. The analysis of variance and the Pareto analysis resulting from the central composite design (CCD) showed that the H₂O₂, CuSO₄, Fe₃O₄ nanoparticles, nano zerovalent iron (nZVI), and gasoline initial concentrations as a secondary contaminant were influential factors on the removal efficiency of tert-butyl mercaptan (with an effectiveness of 2.09%, 13.38%, 1.92%, 2.01%, and 39.73% respectively). Moreover, the interaction of H₂O₂/nZVI, H₂O₂/nFe₃O₄, H₂O₂/CuSO₄, nZVI/nFe₃O₄, and nZVI/CuSO₄ had a positive effect on removal efficiency, while nFe₃O₄/CuSO₄had a negative one. Surprisingly, the mixing of nZVI and nFe₃O₄ before adding them to the reactor did not affect the removal efficiency. The optimum conditions suggested for the maximum removal efficiency of tert-butyl mercaptan were the minimum levels of the initial gasoline concentration (2.5 %w/w), a maximum level of CuSO₄ (0.12 %w/w), and an optimum concentration of H₂O₂, nano-ZVI, and nano-Fe₃O₄ (8.92 %w/v, 0.1194 %w/w and 0.0898 %w/w, respectively) in the studied intervals. This condition led to a 99.27% efficiency removal of tert-butyl mercaptan removal in 20 minutes without pH and temperature adjustments. https://aet.irost.ir/article_857_a2e492186c68be208a21751f718d5510.pdf