Department of Chemistry, Shiraz Branch, Islamic Azad University, P.O. Box 71955-149, Shiraz, Fars, Iran.
Department of Accounting, College of Management and Accounting, Yadegar-e-Imam Khomeini (RAH), Shahre-rey Branch, Islamic Azad University, Tehran, Iran.
J Colloid Interface Sci. 2015 Jul 15;450:424-433. doi: 10.1016/j.jcis.2015.03.026. Epub 2015 Mar 19.
The application of covalently attached ferrocene groups to the aluminum-silicate nanoparticles (ASNPs) for phosphate (P) removal from the synthetic and real waters has been studied and the prepared nanomaterials were analyzed by XPS, EDS, BET, TEM, chemical analysis (CHN), FTIR, and ICP-AES. The immobilization of the ferrocene on the surface of the inorganic support (mixed oxides) can lead to reduce the drawback of the pristine ferrocene molecules which may have strong tendency to agglomerate into larger particles, resulting in the negative effect on both available active sites and catalyst performance. XPS of Fe ions evidenced that most of the active sites of the nano-adsorbent is in the form of Fe(III) ions at the surface. The heterogeneous Fe(III) ions were effective toward removal of phosphate. The contact time to obtain equilibrium for maximum adsorption of phosphate (100%) was found to be 120 min. The adsorption kinetics of P has been evaluated in terms of pseudo-first- and -second-order kinetics, and the Freundlich and Langmuir isotherm models have also been tested to the equilibrium adsorption results. The adsorption process was spontaneous and endothermic in nature and followed pseudo-second-order kinetic model. FTIR, EDS and XPS results confirmed the formation of Fe-O-P bond on the Si/Al@Fe surface after adsorption of P from aqueous media. The Si/Al@Fe displayed high reusability due to its high removal capacity after 10th adsorption-desorption runs. The proposed adsorbent could also be utilized to adsorb the P ions from the real sample (Persian Gulf water). The high removal capacity of P ions from the real water and the high levels of reusability confirmed the versatility of the heterogenized ferrocene groups on the ASNPs.
将共价键合的二茂铁基团应用于铝硅酸盐纳米粒子（ASNPs），用于从合成水和实际水样中去除磷酸盐（P），已经进行了研究，并通过 XPS、EDS、BET、TEM、化学分析（CHN）、FTIR 和 ICP-AES 对制备的纳米材料进行了分析。二茂铁在无机载体（混合氧化物）表面的固定化可以减少原始二茂铁分子的缺点，原始二茂铁分子可能有强烈的团聚成较大颗粒的趋势，从而对可用活性位点和催化剂性能产生负面影响。Fe 离子的 XPS 表明，纳米吸附剂的大部分活性位点在表面上以 Fe(III)离子的形式存在。非均相 Fe(III)离子对磷酸盐的去除有效。发现达到最大吸附磷酸盐（100%）平衡的接触时间为 120 分钟。通过准一级和准二级动力学、 Freundlich 和 Langmuir 等温线模型评估了 P 的吸附动力学，也对平衡吸附结果进行了测试。吸附过程是自发的和吸热的，符合准二级动力学模型。FTIR、EDS 和 XPS 结果证实，在从水介质中吸附 P 后，在 Si/Al@Fe 表面上形成了 Fe-O-P 键。Si/Al@Fe 在 10 次吸附-解吸循环后由于其高去除能力而显示出高的可重复使用性。该吸附剂还可用于从实际样品（波斯湾水）中吸附 P 离子。从实际水样中去除 P 离子的高去除能力和高的可重复使用性证实了杂化二茂铁基团在 ASNPs 上的多功能性。
