Mysore Deepa, Viraraghavan Thiruvenkatachari, Jin Yee-Chung
Faculty of Engineering, University of Regina, Regina, SK, Canada S4S0A2.
Water Res. 2005 Jul;39(12):2643-53. doi: 10.1016/j.watres.2005.04.034.
The main objective of this study was to examine the removal of oil from water by expanded and hydrophobized vermiculite. A pH of 9 showed a higher removal efficiency of oil by vermiculite. Oil removal efficiencies at pH 9 were found to be 79%, 93%, 90%, 57% for standard mineral oil (SMO), Canola oil (CO), Kutwell oil (KUT45), refinery effluent (RE), respectively, in the case of expanded vermiculite, and 56%, 58%, 47%, 43% for SMO, CO, KUT45 and RE, respectively, for hydrophobized vermiculite. Kinetic data satisfied both the Lagergren and Ho models. Equilibrium studies showed that the Langmuir isotherm was the best-fit isotherm for oil removal by both expanded and hydrophobized vermiculite. The data showed a higher adsorptive capacity by the expanded vermiculite compared to the hydrophobized vermiculite. Desorption studies showed that the expanded vermiculite did not desorb oil to the same extent compared to hydrophobized vermiculite. The Freundlich isotherm was the best-fit model for desorption. Expanded vermiculite showed better retention than hydrophobic vermiculite. The results showed that the expanded vermiculite had a greater affinity for oil than hydrophobized vermiculite.
本研究的主要目的是考察膨化疏水蛭石对水中油的去除效果。pH值为9时，蛭石对油的去除效率更高。对于膨化蛭石，pH值为9时，标准矿物油（SMO）、菜籽油（CO）、库特韦尔油（KUT45）、炼油厂废水（RE）的除油效率分别为79%、93%、90%、57%；对于疏水蛭石，SMO、CO、KUT45和RE的除油效率分别为56%、58%、47%、43%。动力学数据符合Lagergren模型和Ho模型。平衡研究表明，Langmuir等温线是膨化疏水蛭石除油的最佳拟合等温线。数据表明，膨化蛭石的吸附容量高于疏水蛭石。解吸研究表明，与疏水蛭石相比，膨化蛭石对油的解吸程度不同。Freundlich等温线是解吸的最佳拟合模型。膨化蛭石比疏水蛭石具有更好的保留性能。结果表明，膨化蛭石对油的亲和力大于疏水蛭石。
