Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Rua do Contorno, S/N Campus do Pici, Bl. 713, CEP 60451-970, Fortaleza, CE, Brazil.
J Colloid Interface Sci. 2011 May 15;357(2):466-73. doi: 10.1016/j.jcis.2011.02.013.
A novel procedure was developed for the synthesis of a periodic mesoporous organosilica (PMO), which was used to remove polycyclic aromatic hydrocarbons (PAHs) from aqueous solutions. Adsorption equilibrium isotherms and adsorption kinetics experiments were carried out in solutions of PAHs (2-60 mg L(-1)), using the PMO as adsorbent. Adsorption models were used to predict the mechanisms involved. The adsorption kinetics data best fitted the pseudo-first-order kinetic model for naphthalene, and to the pseudo-second-order model for fluorene, fluoranthene, pyrene, and acenaphtene. The intraparticle model was also tested and pointed to the occurrence of such processes in all cases. The isotherm models which best represented the data obtained were the Freundlich model for fluoranthene, pyrene, and fluorene, the Temkin model for naphthalene, and the Redlich-Peterson model for acenaphtene. PAHs showed similar behavior regarding kinetics after 24 h of contact between adsorbent and PAHs. FTIR, XRD, BET, and SEM techniques were used for the characterization of the adsorbent material.
开发了一种用于合成介孔有机硅（PMO）的新方法，该方法用于从水溶液中去除多环芳烃（PAHs）。使用 PMO 作为吸附剂，在 PAHs（2-60mg/L）溶液中进行吸附平衡等温线和吸附动力学实验。使用吸附模型预测涉及的机制。萘的吸附动力学数据最好符合准一级动力学模型，芴、荧蒽、芘和苊的吸附动力学数据最好符合准二级动力学模型。还测试了颗粒内模型，并指出在所有情况下都发生了这种情况。对于所得数据，最好表示的等温线模型是对于荧蒽、芘和芴为弗莱因德利希模型，对于萘为坦金模型，对于苊为雷德利希-彼得森模型。在吸附剂和 PAHs 接触 24 小时后，动力学方面 PAHs 表现出相似的行为。使用 FTIR、XRD、BET 和 SEM 技术对吸附剂材料进行了表征。
