关键词: 乳化油, 玉米芯, 花生壳, 月桂酸, 改性, 亲油疏水性, 吸附剂, 吸附, 废水

Abstract: Oil pollution results in detrimental effects on the environment, living organisms and economy. Currently, a lot of attempt is devoted to provide an efficient, easy and cheap method for cleaning-up oil pollution. To improve the efficiency cleaning-up emulsified oil in wastewater, lauric acid was employed to modify corn cob and peanut shell, and these materials were characterized by scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) method and Fourier transform infrared spectrometer (FTIR). The results indicate that the modification of lauric acid is taken place by the esterification reaction between carboxyl in lauric acid and hydroxyl in cellulose, hemicellulose and lignin of biologic materials, and ester group formed is connected to alkyl chain, not only increasing the oleophylic and decreasing hydrophobic property of absorbents, but also creating micro-porosity. So, it can be expected that if the modified materials are employed for removal of emulsified oil, the oil adsorption capacity can be enhanced, because of the combined action of alkyl chain and micro-pore. In order to measure the removal efficiency of emulsified oil, in the present study, petroleum ether is used to extract oil from water sample, and ultraviolet spectroscopy employs for measuring oil concentration. The results show that the oil adsorption capacity is 6.86 mg·g^-1 and 5.21 mg·g^-1 for raw corn cob and peanut shell, and goes up 10.79 mg·g^-1 and 7.44 mg·g^-1 for the modified samples by lauric acid, respectively. Therefore, when biologic materials modified by lauric acid are applied to treat emulsified oily water, not only removal efficiency is high, but also the waste is controled by another waste. It is a very environmental protection measure.

Key words: emulsified oil, corn cob, peanut shell, lauric acid, modification, oleophylic/hydrophobic property, adsorbents, adsorption, wastewater