College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Provincial Engineering Technology Research Center of Seafood, Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China; Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian 116034, China.
College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Guangdong Provincial Engineering Technology Research Center of Seafood, Guangdong Province Engineering Laboratory for Marine Biological Products, Key Laboratory of Advanced Processing of Aquatic Product of Guangdong Higher Education Institution, Zhanjiang 524088, China; Collaborative Innovation Center of Seafood Deep Processing, Dalian Polytechnic University, Dalian 116034, China.
Int J Biol Macromol. 2024 Nov;281(Pt 3):136418. doi: 10.1016/j.ijbiomac.2024.136418. Epub 2024 Oct 10.
Heavy metals and organic dyes commonly coexist in water, which pose a serious threat to human health. Herein, a functional aerogel for adsorption of Cu(II)-methyl orange binary-polluted system was prepared. Cellulose nanofibril (CNF) was prepared by 2,2,6,6-tetramethylpiperidinyloxy (TEMPO)-NaBr-NaClO system using abandoned pineapple leaves as the main raw material, and chitosan/cellulose nanofibril (CS/CNF) composite aerogel was constructed by sol-gel method combined with freeze-drying. The structure of composite aerogel was characterized by XRD, FTIR, TG and SEM. The fabricated aerogels were ultra-lightweight and exhibited a highly porous 3D network structure. The effects of adsorbent dosage, ionic strength, solution pH, adsorbent concentration, adsorption time, and temperature on the adsorption of Cu(II) and methyl orange (MO) by composite aerogel were studied. The adsorption of composite aerogel towards mono-polluted of Cu(II) and MO reached equilibrium after 100 min with a maximum adsorption capacity of 116.69 and 295.86 mg/g, respectively. The adsorption of Cu(II) and MO by CS/CNF aerogel was mainly achieved through electrostatic attraction, metal chelation and hydrogen bonding interactions. More importantly, the adsorption of Cu(II) by CS/CNF aerogel has an inhibitory effect on its adsorption of MO in Cu(II)-MO binary-polluted system.
重金属和有机染料通常共存于水中，对人类健康构成严重威胁。在此，制备了一种用于吸附 Cu(II)-甲基橙二元污染体系的功能化气凝胶。通过 2,2,6,6-四甲基哌啶氧基（TEMPO）-NaBr-NaClO 体系，以废弃菠萝叶为主要原料制备纤维素纳米纤维（CNF），并通过溶胶-凝胶法结合冷冻干燥法构建壳聚糖/纤维素纳米纤维（CS/CNF）复合气凝胶。通过 XRD、FTIR、TG 和 SEM 对复合气凝胶的结构进行了表征。所制备的气凝胶具有超轻的特点，并表现出高度多孔的 3D 网络结构。研究了吸附剂用量、离子强度、溶液 pH、吸附剂浓度、吸附时间和温度对复合气凝胶吸附 Cu(II)和甲基橙（MO）的影响。复合气凝胶对单污染的 Cu(II)和 MO 的吸附在 100 分钟后达到平衡，最大吸附容量分别为 116.69 和 295.86 mg/g。CS/CNF 气凝胶对 Cu(II)和 MO 的吸附主要通过静电吸引、金属螯合和氢键相互作用实现。更重要的是，CS/CNF 气凝胶对 Cu(II)的吸附对其在 Cu(II)-MO 二元污染体系中对 MO 的吸附具有抑制作用。
