Marey A, Adel Marzouk, El Naggar Ahmed M A, El-Zahhar Adel A, Taha Mohamed H
Department of Basic Science, The Valley Higher Institute for Engineering & Technology, Al-Obour 11828, Egypt.
Aluminum Sulphate Company of Egypt, Egypt.
Dalton Trans. 2023 Oct 10;52(39):14194-14209. doi: 10.1039/d3dt02696e.
The wastewater released from different industries is a major environmental issue that has grabbed significant attention lately. Thus, the implementation of suitable routes for the treatment of such water is strongly recommended to reach the level of possible reuse for either industrial or agricultural purposes. In line with such a concept, this research work introduces a new composite structure made the coating of polyacrylamide by loading nickel hydroxide nanoparticles for use as an absorbent for the purification of wastewater from dye contaminants. High internal phase emulation (HIPE) polymerization was utilized to first prepare particles of polyacrylamide followed by their coating with particles of nickel hydroxide to ultimately obtain the designated adsorbent. The structural features and chemical composition of the synthesized composite were confirmed by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and energetic dispersive X-ray (EDX) spectroscopy. Additionally, scanning electron microscopy (SEM) and N adsorption-desorption surface area analysis were employed to detect the textural characteristics of the composite. Subsequently, the efficiency of this structure, as an adsorbent for the disposal of methylene blue dye species from a wastewater sample, was studied. During the water purification process, several operating parameters, namely, retention time, solution pH, initial concentration, and absorbent dose, were investigated. The presented Ni-polyacrylamide composite achieved the promising removal of methylene blue dye. An increased adsorption capacity of 14.3 mg g toward methylene blue was achieved by the composite, thanks to the presence of both organic and inorganic functional groups within its structure. Kinetic and isotherm studies for the adsorption of methylene blue species were found to fit pseudo-second-order and Langmuir models. Additionally, thermodynamic measurements indicated that the adsorption process of methylene blue is feasible, spontaneous, involves physisorption, and is endothermic.
不同行业排放的废水是一个重大环境问题，最近已引起广泛关注。因此，强烈建议采用合适的废水处理途径，以实现工业或农业的再利用。基于这一理念，本研究工作引入了一种新型复合结构，通过负载氢氧化镍纳米颗粒对聚丙烯酰胺进行包覆，用作从染料污染物中净化废水的吸附剂。首先利用高内相乳液（HIPE）聚合制备聚丙烯酰胺颗粒，然后用氢氧化镍颗粒对其进行包覆，最终得到指定的吸附剂。通过X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱和能量色散X射线（EDX）光谱对合成复合材料的结构特征和化学成分进行了确认。此外，采用扫描电子显微镜（SEM）和N吸附-脱附表面积分析来检测复合材料的纹理特征。随后，研究了该结构作为吸附剂处理废水样品中亚甲基蓝染料的效率。在水净化过程中，研究了几个操作参数，即保留时间、溶液pH值、初始浓度和吸附剂剂量。所制备的镍-聚丙烯酰胺复合材料对亚甲基蓝染料具有良好的去除效果。由于其结构中同时存在有机和无机官能团，该复合材料对亚甲基蓝的吸附容量提高到了14.3 mg/g。亚甲基蓝吸附的动力学和等温线研究发现符合准二级和朗缪尔模型。此外，热力学测量表明，亚甲基蓝的吸附过程是可行的、自发的，涉及物理吸附，并且是吸热的。
