Department of Energy Science and Technology, Environmental Waste Recycle Institute, Myongji University, Yongin, Gyeonggi-do 17058, Republic of Korea.
School of Chemical and Bio Engineering, Addis Ababa Institute of Technology, Addis Ababa University, Addis Ababa 1000, Ethiopia.
Int J Biol Macromol. 2024 Nov;281(Pt 2):136377. doi: 10.1016/j.ijbiomac.2024.136377. Epub 2024 Oct 9.
An eco-friendly κ-carrageenan/potato starch bio-hydrogel is designed for the efficient removal of methylene blue (MB) dye from water. The incorporation of potato starch was successfully confirmed through XRD, FT-IR, and SEM analysis, while TGA highlighted the hydrogel's thermal stability. Batch adsorption experiments demonstrated excellent MB removal efficiency, with a maximum adsorption capacity of 116.1 mg/g under optimal conditions (initial dye concentration: 100 mg/L, contact time: 180 min, temperature: 20 °C, adsorbent dosage: 1.6 g/L, and pH: 11). FT-IR analysis indicated that electrostatic interactions and hydrogen bonding primarily govern the adsorption process. The adsorption followed pseudo-second-order kinetics and fitted well with the Langmuir isotherm model. Thermodynamic studies revealed that the adsorption was exothermic and spontaneous. A key feature of this bio hydrogel is its selective affinity for the cationic dye MB, in a mixture with Acid Orange (AO) and other cationic dyes (Rhodamine B (Rh B) and crystal violet (CV)). The adsorbent also demonstrated impressive reusability, maintaining 93 % of its efficiency after five cycles, highlighting its potential for sustainable and cost-effective water treatment.
一种环保的κ-卡拉胶/马铃薯淀粉生物水凝胶被设计用于从水中高效去除亚甲基蓝（MB）染料。通过 XRD、FT-IR 和 SEM 分析成功证实了马铃薯淀粉的掺入，而 TGA 则突出了水凝胶的热稳定性。批处理吸附实验表明，在最佳条件下（初始染料浓度：100mg/L、接触时间：180min、温度：20°C、吸附剂用量：1.6g/L 和 pH：11），MB 的去除效率非常高，最大吸附容量为 116.1mg/g。FT-IR 分析表明，静电相互作用和氢键主要控制吸附过程。吸附过程符合拟二级动力学模型，并很好地符合 Langmuir 等温线模型。热力学研究表明，吸附是放热和自发的。这种生物水凝胶的一个关键特点是它对阳离子染料 MB 具有选择性亲和力，即使在与酸性橙（AO）和其他阳离子染料（罗丹明 B（Rh B）和结晶紫（CV））的混合物中也是如此。该吸附剂还表现出令人印象深刻的可重复使用性，在五个循环后仍保持 93%的效率，突出了其在可持续和具有成本效益的水处理方面的潜力。
