Abstract A composite graphene oxide (GO)/nanocellulose aerogel was prepared by dispersing cellulose nanofibrils (CNFs) into GO nanosheets. CNFs with high aspect ratios and negative potential helped the exfoliation of GO flakes without the need of a chemical linker via steric hindrance and electrostatic repulsion. Water purification tests were performed using methylene blue (MB) and tetracycline (TC) as model pollutants. The composite aerogel obeyed a pseudo-second-order model and Langmuir adsorption isotherm. The composite aerogel possesses a maximum adsorption capacity of 111.2 mg/g for MB and 47.3 mg/g for TC. Meanwhile, the aerogel can be easily recycled and regenerated using ethanol. After three cycles, the aerogel can maintain a high removal efficiency for MB (98%) and TC (97%). The adsorption mechanism was mainly ascribed to electrostatic attraction and π-π interactions.

中文翻译：

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用于高效去除亚甲蓝和四环素的混合氧化石墨烯/纳米原纤化纤维素气凝胶的构建

摘要 通过将纤维素纳米纤维（CNFs）分散到 GO 纳米片中，制备了复合氧化石墨烯（GO）/纳米纤维素气凝胶。具有高纵横比和负电位的 CNF 有助于剥离 GO 薄片，而无需通过空间位阻和静电排斥的化学接头。使用亚甲蓝 (MB) 和四环素 (TC) 作为模型污染物进行水净化测试。复合气凝胶服从准二级模型和朗缪尔吸附等温线。复合气凝胶对 MB 的最大吸附容量为 111.2 mg/g，对 TC 的最大吸附容量为 47.3 mg/g。同时，气凝胶可以很容易地使用乙醇回收和再生。三个循环后，气凝胶可以保持对 MB (98%) 和 TC (97%) 的高去除效率。