Center for Materials Science, Zewail City of Science and Technology, 6 of October City, Giza 12578, Egypt.
Center for Materials Science, Zewail City of Science and Technology, 6 of October City, Giza 12578, Egypt; Pharmaceutical Chemistry Department, National Organization for Drug Control and Research (NODCAR), Giza, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Mar 15;249:119301. doi: 10.1016/j.saa.2020.119301. Epub 2020 Dec 11.
Textile industries produce a massive amount of wastewater that should be cleaned from toxic substances such as fats, colors and any chemicals used during the production steps. Water-treatment methods should be facile, economic, fast and efficient. Here, we report the synthesis, characterization and application of matrix-dispersed superparamagnetic iron oxide nanoparticles (SPIONs) for the removal of anionic dyes from wastewater released from textile industrial plants. The matrix-dispersed SPIONs were synthesized via a solvothermal method in which a polyethyleneimine (PEI) shell was deposited onto SPIONs in order to add positive charges to their surfaces. TEM images revealed that the size of PEI-coated and uncoated SPIONs is 30-50 and 15-30 nm, respectively. Moreover, TEM images depicted that the as synthesized PEI-coated SPIONs show matrix-dispersed structures. Furthermore, the particle size obtained with DLS measurements was found to be 87.93 and 158.9 nm for uncoated and PEI-coated SPIONs, respectively. Bromophenol blue (BPB) and bromocresol green (BCG), two triphenylmethanes, were used as model anionic dyes. FTIR spectroscopy revealed the interaction between the PEI surface coating and the anionic dyes. The apparent ζ-potential measurements showed that the surface negative charges decreased from -13.5 to -4.03 mV upon coating with PEI. In order to investigate the anionic dyes removal/entrapment efficiency of SPIONs, a new derivative visible spectrophotometric method was developed for the simultaneous quantification of BPB and BCG before and after treatment where the linear ranges were 6.98-27.9 and 6.70-26.8 μg/mL and the recovery values were in the ranges of 98.10-101.7% and 99.55-104.8% for BCG and BPB, respectively. It was found that the uptake/adsorption capacity of PEI-coated SPIONs is ca.15.5 and 11.3 mg/g for BCG and BPB, respectively. The calculated thermodynamic parameters for the adsorption of BCG (ΔH = 37.08 J/mol and ΔS = 120.89 J/mol K) and BPB (ΔH = 181.26 J/mol and ΔS = 596.46 J/mol K) and the negative ΔG values indicate that the adsorption is thermodynamically favored. The adsorption processes were found to follow the pseudo-second-order kinetic model with r values of 0.9982 and 0.9956 for BCG and BPB, respectively.
纺织工业生产大量的废水，这些废水需要去除其中的有害物质，如脂肪、颜色和生产过程中使用的任何化学物质。水处理方法应该简单、经济、快速和高效。在这里，我们报告了用于从纺织厂排放的废水中去除阴离子染料的基质分散超顺磁氧化铁纳米粒子 (SPIONs) 的合成、表征和应用。基质分散的 SPIONs 通过溶剂热法合成，其中在 SPIONs 上沉积了一层聚乙烯亚胺 (PEI) 壳，以在其表面上增加正电荷。TEM 图像显示，PEI 包覆和未包覆 SPIONs 的尺寸分别为 30-50nm 和 15-30nm。此外，TEM 图像显示，合成的 PEI 包覆 SPIONs 呈现基质分散结构。此外，通过 DLS 测量得到的粒径分别为 87.93nm 和 158.9nm，用于未包覆和 PEI 包覆的 SPIONs。溴酚蓝 (BPB) 和溴甲酚绿 (BCG) 是两种三苯甲烷，用作模型阴离子染料。FTIR 光谱表明 PEI 表面涂层与阴离子染料之间存在相互作用。明显的 ζ-电势测量表明，在包覆 PEI 后表面负电荷从-13.5mV 降低至-4.03mV。为了研究 SPIONs 对阴离子染料的去除/捕获效率，开发了一种新的衍生可见分光光度法，用于在处理前后同时定量 BPB 和 BCG，线性范围分别为 6.98-27.9μg/mL 和 6.70-26.8μg/mL，回收率分别为 98.10-101.7%和 99.55-104.8%，用于 BCG 和 BPB。发现 PEI 包覆的 SPIONs 对 BCG 和 BPB 的吸附容量分别约为 15.5mg/g 和 11.3mg/g。BCG（ΔH=37.08J/mol 和 ΔS=120.89J/mol K）和 BPB（ΔH=181.26J/mol 和 ΔS=596.46J/mol K）吸附的计算热力学参数和负 ΔG 值表明吸附是热力学有利的。吸附过程遵循拟二级动力学模型，r 值分别为 0.9982 和 0.9956，用于 BCG 和 BPB。
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