Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Environ Res. 2019 Apr;171:428-436. doi: 10.1016/j.envres.2019.01.055. Epub 2019 Jan 31.
Phosphorus is a necessary nutrient for the growth and survival of living beings. Nevertheless, an oversupply of phosphorus in wastewater results in eutrophication. Therefore, its removal from wastewater is important. However, coexisting components, such as anions, heavy metals, and organic matter, might inhibit the phosphate-adsorption mechanism by competing for the active surface sites of the adsorbent. In this study, iron oxide nanoflakes (INFs) were fabricated on iron foil via anodization. The rate of phosphate adsorption from wastewater onto INFs in the presence of three different coexisting components-anions, heavy metals, and organic matter-was evaluated. The morphology of the INFs was analyzed by X-ray diffraction, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and Fourier-transform infrared spectroscopy. The phosphate adsorption equilibrium time using INFs was found to be 1 h. The Elovich model (R > 0.99) and the Langmuir model (R >0.95) respectively provided the best description of the adsorption kinetics and isotherm, suggesting the chemisorption nature of adsorption. The estimated adsorption capacity of the INFs was 21.5 mg-P g. The effect of anions (chloride, sulfate, nitrate, and carbonate) and heavy metals (Cd, As, Cr, and Pb) was studied at three different molar ratios (0.5:1, 1:1, and 1.5:1). The effect of different types of organic matter, such as citric acid, humic acid, and oxalic acid at concentrations of 100 and 200 mg L, was also examined. In five regeneration cycles, the total amount of phosphate adsorbed and desorbed, and the recovery percentage were 6.51 mg-P g, 5.16 mg-P g, and 79.24%, respectively.
磷是生物生长和生存所必需的营养物质。然而，废水中磷的过量供应会导致富营养化。因此，从废水中去除磷是很重要的。然而，共存的成分，如阴离子、重金属和有机物，可能会通过竞争吸附剂的活性表面位点来抑制磷酸盐的吸附机制。在这项研究中，通过阳极氧化在铁箔上制备了氧化铁纳米片（INFs）。评估了在三种不同共存成分-阴离子、重金属和有机物存在的情况下，从废水中吸附到 INFs 上的磷酸盐的速率。通过 X 射线衍射、场发射扫描电子显微镜、能量色散 X 射线光谱、X 射线光电子能谱和傅里叶变换红外光谱对 INFs 的形貌进行了分析。发现使用 INFs 的磷酸盐吸附平衡时间为 1 小时。Elovich 模型（R>0.99）和 Langmuir 模型（R>0.95）分别对吸附动力学和等温线进行了最佳描述，表明吸附为化学吸附。INFs 的估计吸附容量为 21.5mg-P g。研究了三种不同摩尔比（0.5:1、1:1 和 1.5:1）下阴离子（氯、硫酸盐、硝酸盐和碳酸盐）和重金属（Cd、As、Cr 和 Pb）的影响。还研究了浓度为 100 和 200mg L 的不同类型有机物（柠檬酸、腐殖酸和草酸）的影响。在五个再生循环中，吸附和脱附的总磷量以及回收百分比分别为 6.51mg-P g、5.16mg-P g 和 79.24%。
