Panjin Institute of Industrial Technology, Dalian University of Technology, Panjin 124221, PR China.
Department of Chemistry, University of Petroleum and Energy Studies, Bidholi, Via- Premnagar, Dehradun, 248007, India.
J Hazard Mater. 2020 Jul 5;393:122417. doi: 10.1016/j.jhazmat.2020.122417. Epub 2020 Feb 27.
The removal of diclofenac sodium (DFS) from wastewater has attracted increasing attention because it is within the extensively prescribed nonsteroidal anti-inflammatory drugs and pose ecotoxicity. Therefore, fabrication of versatile adsorbents of low-cost, higher-effectiveness and excellent recyclability is significant for the treatment of DFS contaminated wastewater. This work reports a promising biobased egg albumin (ALB) hydrogel functionalized with a large density of adsorptive amine sites via polyethyleneimine (PEI). The composite ALB/PEI hydrogel demonstrated an excellent DFS removal capacity, i.e. 232.5 mg/g, in an optimum experimental condition (pH∼6; contact time∼180 min; adsorbent dosage∼0.5 g/L) which revealed to be considerably higher or competitive than many reported adsorbents. The adsorption isotherms better accorded with the Langmuir model and the kinetics with the pseudo second-order model, indicating the mono-layer chemisorption process. Besides, the regeneration steps up to four sequential adsorption/desorption cycles demonstrated an excellent reusability. The Fourier-transform infrared spectrometry (FTIR), and X-ray photoelectron spectroscopy (XPS) results implied that the adsorption process followed via the electrostatic interactions, hydrogen bonding, and π-π stacking between the functionality of hydrogel and aromatic rings of DFS. Considering the low-cost, and an excellent DFS removal capacity, the natural composite ALB/PEI hydrogel could be a promising adsorbent for the treatment of DFS contaminated wastewater.
从废水中去除双氯芬酸钠（DFS）引起了越来越多的关注，因为它是广泛规定的非甾体抗炎药之一，具有生态毒性。因此，制造低成本、高效率和优异可回收性的多功能吸附剂对于处理 DFS 污染废水具有重要意义。本工作报道了一种有前景的基于生物的卵清蛋白（ALB）水凝胶，通过聚乙烯亚胺（PEI）在其表面功能化，具有大量的吸附性胺基。在最佳实验条件（pH∼6；接触时间∼180 分钟；吸附剂用量∼0.5 g/L）下，复合 ALB/PEI 水凝胶表现出优异的 DFS 去除能力，即 232.5 mg/g，这明显高于或优于许多已报道的吸附剂。吸附等温线更符合朗缪尔模型，动力学更符合准二级模型，表明这是单分子层化学吸附过程。此外，经过四个连续的吸附/解吸循环的再生步骤，证明了其具有优异的可重复使用性。傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）结果表明，吸附过程遵循水凝胶的官能团与 DFS 的芳环之间的静电相互作用、氢键和π-π堆积。考虑到低成本和优异的 DFS 去除能力，天然复合 ALB/PEI 水凝胶可能是处理 DFS 污染废水的一种有前途的吸附剂。
