Department of Environmental Engineering, University of Tehran, Tehran, Iran ; Department of Chemistry, Islamic Azad University, Tehran, Iran.
Department of Environmental Engineering, University of Tehran, Tehran, Iran.
J Environ Health Sci Eng. 2014 Jul 15;12:105. doi: 10.1186/2052-336X-12-105. eCollection 2014.
Magnetic nanoparticles (MNPs) were modified with 3-Mercaptopropytrimethoxysiline (MPTMS) and grafted with allyl glycidyl ether for coupling with beta naphtol as a method to form a novel nano-adsorbent to remove two poly aromatic hydrocarbons (PAHs) from contaminated water. The modified MNPs were characterized by transmission electron microscopy, infrared spectroscopy and thermogravimetric analysis. Results showed that the modified MNPs enhanced the process of adsorption. Tests were done on the adsorption capacity of the two PAHs on grafted MNPs; factors applied to the tests were temperature, contact time, pH, salinity and initial concentration of PAHs. Results revealed that adsorption equilibrium was achieved in 10 min, and the maximum adsorption capacity was determined as 4.15 mg/g at pH = 7.0 and 20°C. The equilibrium adsorption data of the two PAHs by the modified MNPs were analyzed by Langmuir, Freundlich and Temkin models. Equilibrium adsorption data was determined from the Langmuir, Freundlich and Temkin constants from tests under conditions of pH = 7 and temperature 20°C. Analysis of the adsorption-desorption process indicated that the modified MNPs had a high level of stability and good reusability. Magnetic separation in these tests was fast and this shows that the modified MNPs have great potential to be used as a new adsorbent for the two PAHs removal from contaminated water in water treatment.
磁性纳米粒子 (MNPs) 用 3-巯丙基三甲氧基硅烷 (MPTMS) 进行修饰，并与烯丙基缩水甘油醚接枝，与 β-萘酚偶联，形成一种新型纳米吸附剂，用于从受污染的水中去除两种多环芳烃 (PAHs)。修饰后的 MNPs 通过透射电子显微镜、红外光谱和热重分析进行了表征。结果表明，修饰后的 MNPs 增强了吸附过程。测试了两种 PAHs 在接枝 MNPs 上的吸附容量；应用于测试的因素包括温度、接触时间、pH 值、盐度和 PAHs 的初始浓度。结果表明，吸附在 10 分钟内达到平衡，在 pH = 7.0 和 20°C 时，最大吸附容量为 4.15mg/g。用改性 MNPs 对两种 PAHs 的平衡吸附数据进行了 Langmuir、Freundlich 和 Temkin 模型分析。在 pH = 7 和温度 20°C 的条件下进行测试，从 Langmuir、Freundlich 和 Temkin 常数中确定了平衡吸附数据。吸附-解吸过程的分析表明，改性 MNPs 具有较高的稳定性和良好的可重复使用性。在这些测试中，磁分离速度很快，这表明改性 MNPs 具有很大的潜力，可作为一种从受污染水中去除两种 PAHs 的新型吸附剂，用于水处理。
