Faculty of Science, Chemistry Department, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt.
Faculty of Science, Chemistry Department, Alexandria University, P.O. Box 426, Alexandria 21321, Egypt.
Int J Biol Macromol. 2019 Sep 15;137:455-468. doi: 10.1016/j.ijbiomac.2019.06.170. Epub 2019 Jun 26.
Heavy metal removal by waste material from different industry has become one of the main economical approaches for zero waste industrial activity. Therefore, iron oxide fine waste by-product from steel industry was converted into nanoparticulates (FeO NPs) and further crosslinked with starch as a good stabilizer and biodegradable polymer using formaldehyde to form FeO NPs-Starch nanocomposite. The scanning electron microscope (SEM) showed the average particle size (40-70 nm). The sorption behavior of this nanocomposite was investigated using Pb(II), Hg(II) and Cd(II). Different factors such as solution pH, contact time, nanocomposite dosage and metal concentration were monitored to determine the adsorptive capacity. Langmuir, Temkin, Freundlich and Dubinin-Radushkevich models were employed to study the adsorption isotherms. The maximum sorption capacities were 2000 mg g for Pb(II), 133.3 mg g for Hg(II) and 322.58 mg g for Cd(II). The results referred that Hg(II) and Cd(II) were best fitted by all models except Pb(II) obeyed the Freundlich isotherm model only. The FeO NPs-Starch nanocomposite emphasized its potential application as a sustainable low cost nanocomposite for metals extraction from tap water, marine water and industrial wastewater with percentage recovery 93-97%, 70-94% and 76-93%, respectively.
利用来自不同行业的废料去除重金属已成为零废物工业活动的主要经济方法之一。因此，将钢铁行业产生的氧化铁细废副产品转化为纳米颗粒（FeO NPs），并进一步与淀粉交联，淀粉作为良好的稳定剂和可生物降解聚合物，使用甲醛形成 FeO NPs-淀粉纳米复合材料。扫描电子显微镜（SEM）显示平均粒径为（40-70nm）。使用 Pb(II)、Hg(II)和 Cd(II)研究了这种纳米复合材料的吸附行为。监测了不同因素，如溶液 pH 值、接触时间、纳米复合材料用量和金属浓度，以确定吸附容量。采用 Langmuir、Temkin、Freundlich 和 Dubinin-Radushkevich 模型研究了吸附等温线。最大吸附容量分别为 2000mg/g 的 Pb(II)、133.3mg/g 的 Hg(II)和 322.58mg/g 的 Cd(II)。结果表明，Hg(II)和 Cd(II)除了 Pb(II)仅符合 Freundlich 等温模型外，所有模型都拟合得最好。FeO NPs-淀粉纳米复合材料强调了其作为可持续低成本纳米复合材料从自来水、海水和工业废水中提取金属的潜在应用，回收率分别为 93-97%、70-94%和 76-93%。
