Application of acid modified polyurethane foam surface for detection and removing of organochlorine pesticides from wastewater

The commercial polyurethane foam was acid modified to get an inexpensive adsorbent (AM-PUF) has highly surface polarity and sorption capacity. The elemental analysis, scanning electron microscopy, thermal analysis, ultraviolet/visible/infrared spectroscopies and X-ray diffraction were used for characterization of AM-PUF. The surface of AM-PUF has amorphous character (broadband at 2 theta, 21.75 degrees) and contains several active sites e.g. N-H, O-H, C=O, C=C and C-O-C groups. The electrical conductivity (sigma.), iodine value and methylene blue index of AM-PUF are 1.7 x 10(-5) Omega(-1) m(-1), 208 mg/g and 107 mg/g. The AM-PUF has a high efficiency for completely removing (99-100%) of Aldrin, DDT, Endrin, Heptachlor, Heptachlor epoxide and Lindane pesticides in both acidic and alkaline solutions. The removing rates of the organochlorine pesticides from wastewater are very rapid (t(1/2) =22 s). The negative value of Delta G (-10.9 kJ/mol) for removing of OCPs using AM-PUF showed that the feasibility of the removing process and its spontaneous nature. (C) 2017 Elsevier B.V. All rights reserved.