Uysal Emircan, Dursun Halide Nur, Uysal Emre Can, Gürmen Sebahattin
Department of Metallurgical and Materials Engineering, Faculty of Chemical and Metallurgical Engineering, Istanbul Technical University, İstanbul, Turkiye.
Department of Mineral Processing Engineering, Faculty of Mines, Istanbul Technical University, İstanbul, Turkiye.
Turk J Chem. 2024 Dec 8;49(2):154-175. doi: 10.55730/1300-0527.3719. eCollection 2025.
Chemical compounds in wastewater, including dye molecules, have been identified as significant concerns for environmental integrity and human health. In this study, adsorbent materials were synthesized from biodegradable polymers to remove methylene blue (MB) from wastewater. Calcium alginate hydrogels were produced and coated with chitosan to enhance their pH stability. Furthermore, the calcium alginate gels were doped with silver nanoparticles to improve their photocatalytic properties, promoting MB degradation and enabling gel reuse. The adsorption behavior of the gels was comprehensively examined under dark conditions, considering factors such as time, solid-to-liquid ratio, temperature, and pollutant concentration, all of which significantly impact the adsorption process. The wastewater, containing 100 ppm of MB, was subjected to a cleaning process that resulted in a reduction of the initial concentration by over 95%. Adsorption kinetics, thermodynamic constants, and adsorption isotherms were studied to understand the underlying mechanisms better. It was observed that the adsorption kinetics were compatible with pseudo-second-order with R values above 0.99 and the adsorption kinetics were compatible with Freundlich with 0.9996. Modeling and simulation studies were used to establish the correlation between adsorption behavior and the concentration of dye material. Subsequently, UV light exposure was applied, enhancing further efficiency and enabling gel regeneration. Even after five cycles, the gels maintained an efficiency of 88.42%. Structural characterizations, pH stability assessments, and cytotoxicity analyses were conducted to evaluate the suitability of the gels for wastewater treatment with minimal environmental or health impact.
废水中的化合物，包括染料分子，已被确认为对环境完整性和人类健康的重大问题。在本研究中，由可生物降解聚合物合成吸附材料以从废水中去除亚甲基蓝（MB）。制备了海藻酸钙水凝胶并用壳聚糖包覆以增强其pH稳定性。此外，海藻酸钙凝胶掺杂有银纳米颗粒以改善其光催化性能，促进MB降解并使凝胶能够重复使用。在黑暗条件下全面研究了凝胶的吸附行为，考虑了时间、固液比、温度和污染物浓度等因素，所有这些因素都对吸附过程有显著影响。含有100 ppm MB的废水经过净化处理，初始浓度降低了95%以上。研究了吸附动力学、热力学常数和吸附等温线以更好地理解其潜在机制。观察到吸附动力学符合伪二级动力学，R值高于0.99，吸附动力学符合Freundlich等温线，R值为0.9996。使用建模和模拟研究来建立吸附行为与染料材料浓度之间的相关性。随后，施加紫外光照射，提高了进一步的效率并实现了凝胶再生。即使经过五个循环，凝胶仍保持88.42%的效率。进行了结构表征、pH稳定性评估和细胞毒性分析，以评估凝胶对废水处理的适用性，同时对环境或健康的影响最小。
