Akdeniz University, Faculty of Science, Department of Chemistry, Antalya, Turkey.
Akdeniz University, Faculty of Science, Department of Chemistry, Antalya, Turkey.
Int J Biol Macromol. 2020 Oct 1;160:823-835. doi: 10.1016/j.ijbiomac.2020.05.191. Epub 2020 May 26.
Water pollution caused by dyes is a significant global problem. Adsorption technique is successfully applied for the removal of dyes from water. In this technique, the use of effective adsorbents is very important. Here, agar/κ-carrageenan composite hydrogel adsorbent prepared through free radical cross-linking reaction in the presence of tri (ethylene glycol) divinyl ether as a cross-linker and characterized by using FTIR, SEM and TGA measurements was used to remove Methylene Blue from water. FTIR results exhibited that electrostatic interaction and hydrogen bonding formation were the main interactions in the adsorptive removal of Methylene Blue by agar/κ-carrageenan hydrogel. Pseudo second order and Langmuir models were found to be the most suitable kinetic and isotherm models, respectively. Maximum dye adsorption capacity of 242.3 mg·g was obtained at 35 °C and pH 7. Thermodynamic parameters were calculated to understand the nature of adsorption process. Different solvents were applied for the regeneration of dye adsorbed-agar/κ-carrageenan hydrogel and the most suitable solvent was determined as ethyl alcohol. The results demonstrated that agar/κ-carrageenan hydrogel is a promising adsorbent for the removal of cationic dyes from water.
水污染是一个全球性的严重问题，而染料是造成水污染的主要元凶之一。吸附技术被成功应用于从水中去除染料。在这种技术中，使用有效的吸附剂非常重要。本文使用 FTIR、SEM 和 TGA 测量来表征三（乙二醇）二乙烯基醚作为交联剂存在下通过自由基交联反应制备的琼脂/κ-卡拉胶复合水凝胶吸附剂，并将其用于从水中去除亚甲蓝。FTIR 结果表明，琼脂/κ-卡拉胶水凝胶对亚甲蓝的吸附去除主要是通过静电相互作用和氢键形成。发现准二级和 Langmuir 模型分别是最适合的动力学和等温线模型。在 35°C 和 pH 7 下，最大染料吸附容量为 242.3mg·g。计算了热力学参数以了解吸附过程的性质。应用不同的溶剂对吸附了染料的琼脂/κ-卡拉胶水凝胶进行再生，确定最适合的溶剂为乙醇。结果表明，琼脂/κ-卡拉胶水凝胶是一种很有前途的用于从水中去除阳离子染料的吸附剂。
