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Wang N.,Tianjin University | Zhang Y.,Tianjin University | Zhu F.,TEDA Landoo Oilfield Service Co. | Li J.,TEDA Landoo Oilfield Service Co. | And 2 more authors.
Environmental Science and Pollution Research | Year: 2014

The toxicity of soluble oil to the aquatic environment has started to attract wide attention in recent years. In the present work, we prepare graphene according to oxidation and thermal reduction methods for the removal of soluble oil from the solution. Characterization of the as-prepared graphene are performed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Raman spectra, Brunauer-Emmett-Teller, X-ray photoelectron spectroscopy, and contact angle analysis. The adsorption behavior of soluble oil on graphene is examined, and the obtained adsorption data are modeled using conventional theoretical models. Adsorption experiments reveal that the adsorption rate of soluble oil on graphene is notably fast, especially for the soluble diesel oil, which could reach equilibrium within 30 min, and the kinetics of adsorption is perfectly consistent with a pseudo-second-order model. Furthermore, it is determined that the adsorption isotherm of soluble diesel oil with graphene fit the Freundlich model best, and graphene has a very strong adsorption capacity for soluble diesel oil in the solution. These results demonstrate that graphene is the material that provided both good adsorptive capacity and good kinetics, implying that it could be used as a promising sorbent for soluble oil removal from wastewater. © 2014 Springer-Verlag Berlin Heidelberg.

Li D.,Tianjin University | Zhu F.Z.,TEDA Landoo Oilfield Service Co. | Li J.Y.,TEDA Landoo Oilfield Service Co. | Na P.,Tianjin University | Wang N.,Tianjin University
Industrial and Engineering Chemistry Research | Year: 2013

An investigation about the acetylation of cellulose fibers extracted by acidified sodium chlorite and sodium hydroxide from corn straw was undertaken to examine its potential for use as sorbents in oil spill cleanup. The extent of acetylation was measured by weight percent gain (WPG), which increased with the extent of reaction time and reaction temperature. According to WPG and oil sorption capacity of the acetylated cellulose fibers, the optimum acetylated condition for cellulose fibers was at 120 °C for 7 h. As shown by the adsorption kinetic experiments, more than 90% of the diesel oil was absorbed by the acetylated cellulose fibers within the first 5 min and the adsorption kinetic was consistent with the simulated-second-order model. Characterization of the acetylated and unmodified cellulose fibers was performed by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), and contact angle analysis. The results showed that the acetylated cellulose fibers were significantly oleophilic and did not get wet with water. Therefore, the acetylated cellulose fibers provided potential for the better utilization of agricultural residues as natural sorbents in oil cleanup. © 2012 American Chemical Society.

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