Polymer Chemistry Research Laboratory, Faculty of Chemistry and Petroleum Science, Shahid Beheshti University, P. O. Box: 1983969411, Tehran, Iran.
Polymer Chemistry Research Laboratory, Faculty of Chemistry and Petroleum Science, Shahid Beheshti University, P. O. Box: 1983969411, Tehran, Iran.
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126585. doi: 10.1016/j.ijbiomac.2023.126585. Epub 2023 Aug 31.
Our objective in this study is to fabricate a novel chitosan-based ternary nanocomposite hydrogel film by incorporating graphene oxide (GO) nanosheets into a chitosan/partially hydrolyzed polyacrylamide (PHPA) network to boost adsorption efficiency through one step self-assembly process in water. Basically, H-bonding interactions drive the formation of a crosslinking network structure. The Batch adsorption experiments evaluated the hydrogel nanocomposite's MB adsorption performance. By loading GO, surface roughness, swelling percentage (from 21,200 % to 35,800 %), elastic modulus of up to 73.7 Pa, and adsorption characteristics (from 282 mg/g to 468 mg/g) were enhanced. The nanocomposite displayed outstanding thermally/pH responsiveness properties. MB adsorption equilibrium was reached after 45 min and the adsorption capacity was 476.19 mg.g when the initial concentration was 100 mg/L. The MB adsorption kinetics and isotherms by the nanocomposite were well correlated by the PSO and the Langmuir models (R > 0.99), respectively. The loaded nanocomposite was shown to be regenerative for five cycles through desorption studies. Thermodynamic analysis indicated that MB adsorption occurred spontaneously (ΔG°: -16.47 kJ/mol, 303 K) and exothermically (ΔH°: -79.49 kJ/mol). A plausible adsorption mechanism was proposed for the nanocomposite developed for MB removal. Our results can contribute to the design and fabrication of nanocomposite adsorbents to treat wastewater.
我们的研究目的是通过将氧化石墨烯（GO）纳米片掺入壳聚糖/部分水解聚丙烯酰胺（PHPA）网络中，在一步自组装过程中制造出一种新型壳聚糖基三元纳米复合水凝胶薄膜，以提高吸附效率。基本上，氢键相互作用驱动交联网络结构的形成。批处理吸附实验评估了水凝胶纳米复合材料对 MB 的吸附性能。通过负载 GO，表面粗糙度、溶胀率（从 21200%增加到 35800%）、弹性模量高达 73.7 Pa 和吸附特性（从 282 mg/g 增加到 468 mg/g）都得到了增强。该纳米复合材料表现出出色的热/pH 响应特性。在初始浓度为 100 mg/L 时，45 分钟后达到 MB 吸附平衡，吸附容量为 476.19 mg/g。纳米复合材料的 MB 吸附动力学和等温线通过 PSO 和 Langmuir 模型（R>0.99）得到了很好的拟合。通过解吸研究表明，负载的纳米复合材料可进行五次循环再生。热力学分析表明，MB 吸附是自发进行的（ΔG°：-16.47 kJ/mol，303 K）且是放热的（ΔH°：-79.49 kJ/mol）。提出了一种用于去除 MB 的纳米复合材料的吸附机理。我们的研究结果可为设计和制造用于处理废水的纳米复合材料吸附剂提供参考。
