Hydrophobic dolomite sorbent for oil spill clean-ups: Kinetic modeling and isotherm study

摘要: Abstract A low-cost chemical hydrophobic sorbent was synthesized by the dip-coating method. The characterized using different methods, including TGA, FTIR, XRD, SEM, and Zeta potential. removal of unconventional oil from water palmitic acid-modified dolomite investigated batch adsorption after varying pHs (1–9), contact times (5–80 min), adsorbent dosage (0.1–0.7 g mL−1), initial concentration (3000–7000 ppm), salinity (0–0.1 g mL−1) temperatures (299 309 K). TGA analysis revealed increase in maximum sorption capacity about 64 to 498 mg g−1 (Dilbit) 98 530 mg g−1 (Bakken oil) oil-water mixture. kinetic studies showed that pseudo-second (PSO) model described on sorbents a much better manner than other models term R2 values indicating overall rate process might be controlled strong reaction between molecules active sites surface sorbent. However, obtained free energy estimated Dubinin-Radushkevich (D-R) isotherm were 7.57 7.833 KJ mol−1 for Dilbit Bakken oil, respectively, which indicated physical nature studied PSO is not only rate-limiting step mechanisms may control sorption, as all them operating simultaneously. external mass transport sorbate film diffusion this system very fast comparison with intraparticle adsorption. For both tested oils, experimental data agreed Sips, Toth, Temkin, Freundlich due highly heterogeneous systems.