School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou 510640, China.
School of Food Science and Engineering, Guangdong Province Key Laboratory for Green Processing of Natural Products and Product Safety, Engineering Research Center of Starch and Vegetable Protein Processing Ministry of Education, South China University of Technology, Guangzhou 510640, China; Overseas Expertise Introduction Center for Discipline Innovation of Food Nutrition and Human Health (111 Center), Guangzhou 510641, China; College of Life and Geographic Sciences, Kashi University, Kashi 844000, China.
Int J Biol Macromol. 2021 Oct 1;188:993-1002. doi: 10.1016/j.ijbiomac.2021.07.192. Epub 2021 Aug 3.
A cellulose-based sodium alginate/iron hydroxide (C/SA/Fe) composite hydrogel was fabricated by using epichlorohydrin as cross-linking agent as an effective adsorbent for dye. The physicochemical structure of the C/SA/Fe hydrogel was characterized by SEM, FTIR, XRD and TG. The adsorption performance for the removal of methylene blue (MB) was investigated. In addition, the selective adsorption of cationic dye was also studied. The FTIR analysis revealed that the Fe(OH) colloidal particles were successfully combined in the cellulose/sodium alginate hydrogel. The modified hydrogel had better adsorption performance, and the maximum adsorption capacity of C/SA/Fe0.5 for MB was 105.93 mg/g according to the fitting results of adsorption isotherm. The kinetic study showed that the adsorption of MB onto C/SA/Fe was more consistent with the pseudo-second-order model, and was dominated by chemisorption mechanism such as ion exchange or electron sharing. The adsorption data fits well with the Langmuir model. Thermodynamics analysis showed that the MB adsorption by C/SA/Fe was exothermic, spontaneous, favorable and feasible. After five adsorption-desorption cycles, the adsorption capacity was almost unchanged. So, the C/SA/Fe hydrogel is a potential material in the field of the recovery of agricultural by-products or other bio-based cellulose, or environmental protection, etc.
一种以纤维素为基础的海藻酸钠/氢氧化铁（C/SA/Fe）复合水凝胶是通过使用表氯醇作为交联剂来制备的，作为一种有效的染料吸附剂。C/SA/Fe 水凝胶的物理化学结构通过 SEM、FTIR、XRD 和 TG 进行了表征。研究了其对亚甲基蓝（MB）的去除吸附性能。此外，还研究了对阳离子染料的选择性吸附。FTIR 分析表明，Fe(OH)胶体颗粒成功地结合在纤维素/海藻酸钠水凝胶中。改性水凝胶具有更好的吸附性能，根据吸附等温线的拟合结果，C/SA/Fe0.5 对 MB 的最大吸附容量为 105.93mg/g。动力学研究表明，MB 对 C/SA/Fe 的吸附更符合准二级模型，主要是离子交换或电子共享等化学吸附机制。吸附数据与 Langmuir 模型拟合良好。热力学分析表明，C/SA/Fe 对 MB 的吸附是放热、自发、有利和可行的。经过五次吸附-解吸循环后，吸附容量几乎不变。因此，C/SA/Fe 水凝胶是农业副产品或其他生物基纤维素回收、环境保护等领域的潜在材料。
