Institute of Chemical Sciences, University of Peshawar, Pakistan.
Institute of Chemical Sciences, University of Peshawar, Pakistan.
Int J Biol Macromol. 2020 Dec 1;164:2922-2930. doi: 10.1016/j.ijbiomac.2020.08.140. Epub 2020 Aug 22.
In this study, cobalt oxide nanoparticles (CoO NPs) were synthesized by precipitation method from cobalt sulphate solution with basic pH, followed by calcination. The ex-situ synthesized CoO NPs were mixed with hot agar (AG) aqueous solution. The preparation of AG- CoO nanocomposite hydrogel was carried out by self-association method promoted by thermal denaturation. The quenching of hot suspension from 80 °C to room temperature resulted in the formation of AG-CoO nanocomposite hydrogel. The as-synthesized AG-CoO was characterized by FTIR, XRD and SEM techniques. In order to test the catalytic activity, AG-CoO was used as a heterogeneous catalyst for the reduction of methylene blue (MB), congo red (CR) and 4-nitrophenol (4-NP). The excellent performance of the AG-CoO was shown by the reaction rate constant (k) values of 0.3623, 0.2114 and 0.2893 for MB, 4-NP and CR, respectively. All these results were obtained with R above 94 and utilization of an AG-CoO catalyst. Furthermore, the catalytic reduction was studied with varying dye concentration and catalyst dose. This study showed that AG-CoO catalyst has high potential for remediation of environmental pollutants in wastewaters.
在这项研究中，通过在碱性 pH 的硫酸钴溶液中沉淀的方法合成了氧化钴纳米粒子（CoO NPs），然后进行煅烧。将合成的 CoO NPs 与热琼脂（AG）水溶液混合。通过热变性促进的自组装方法制备了 AG-CoO 纳米复合材料水凝胶。将 80°C 的热悬浮液淬火至室温导致形成 AG-CoO 纳米复合材料水凝胶。通过 FTIR、XRD 和 SEM 技术对合成的 AG-CoO 进行了表征。为了测试催化活性，将 AG-CoO 用作还原亚甲基蓝（MB）、刚果红（CR）和 4-硝基苯酚（4-NP）的多相催化剂。AG-CoO 的优异性能表现为对 MB、4-NP 和 CR 的反应速率常数（k）值分别为 0.3623、0.2114 和 0.2893。所有这些结果都是在 R 值大于 94 和使用 AG-CoO 催化剂的情况下获得的。此外，还研究了不同染料浓度和催化剂剂量对催化还原的影响。这项研究表明，AG-CoO 催化剂在处理废水中的环境污染物方面具有很高的潜力。
