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首页> 外文期刊>Environmental research >Effect of phosphate concentration, anions, heavy metals, and organic matter on phosphate adsorption from wastewater using anodized iron oxide nanoflakes
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Effect of phosphate concentration, anions, heavy metals, and organic matter on phosphate adsorption from wastewater using anodized iron oxide nanoflakes

机译：磷酸盐浓度，阴离子，重金属和有机质对使用阳极氧化铁氧化氧化铁磷酸盐的磷酸盐吸附的影响

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摘要

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-2 0.99) and the Langmuir model (R-2 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(-1). 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-1, 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(-1), 5.16 mg-P g(-1), and 79.24%, respectively.
机译：磷是生长生长和生存的必要营养素。然而，废水中的磷供过于求导致富营养化。因此，它从废水中的去除很重要。然而，共存组分，例如阴离子，重金属和有机物，可以通过竞争吸附剂的活性表面位点来抑制磷酸盐吸附机制。在本研究中，通过阳极氧化在铁箔上制造氧化铁纳米薄膜（INFS）。评估了在三种不同共存组分 - 阴离子，重金属和有机物质的存在下从废水中的磷酸盐吸附速率。通过X射线衍射，现场发射扫描电子显微镜，能量分散X射线光谱，X射线光电子能谱和傅立叶变换红外光谱分析了INFS的形态。发现使用INFS的磷酸盐吸附平衡时间为1小时。 Elovich模型（R-2> 0.99）和Langmuir模型（R-2> 0.95）分别提供了吸附动力学和等温线的最佳描述，表明吸附的化学性质。估计的INFS的吸附能力为21.5mg-P g（-1）。在三种不同的摩尔比（0.5：1,1：1和1.5：1）中研究阴离子（氯化物，硫酸盐，硝酸盐和碳酸盐）和重金属（Cd，As，Cr和Pb）的影响。还研究了不同类型的有机物质，例如柠檬酸，腐殖酸和浓度为100-200mg L-1的植物的效果。在五个再生循环中，吸附和解吸的磷酸盐的总量分别为6.51mg-p g（-1），5.16mg-p g（-1）和79.24％。

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