Abstract This study is the first, to the best of our knowledge, where waste napkin paper was successfully valorized to low-density (27.2 mg cm−3) cellulose aerogels for oil sorption material. Two simple methods with different gel coagulators, ethanol and sulfuric acid, were used for preparation of the aerogel. Conditions for the alkaline treatment of the raw material and the pre-freezing temperature in the lyophilization process were optimized. It was found that the water and oil sorption capacities of the aerogels were not significantly affected by alkaline treatment, while they could be adjusted by changing the pre-freezing temperature. Although the produced aerogels were initially amphiphilic, hydrophobic surfaces were obtained by vapor deposition of methyltrimethoxysilane (MTMS) and these materials possessed high sorption capacities, up to 32.24 cm3 g−1 (28.56 g g−1) for pump oil and 26.77 cm3 g−1 (39.59 g g−1) for chloroform. This was comparable to aerogels prepared from fresh cellulosic materials via the sol-gel method, as their sorption capacities varied in the range of 14–45 g g−1.

中文翻译：

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来自废餐巾纸的疏水纤维素气凝胶用于吸油应用

摘要 据我们所知，这项研究是首次将废餐巾纸成功地转化为低密度（27.2 mg cm-3）纤维素气凝胶作为吸油材料。两种使用不同凝胶凝固剂的简单方法，乙醇和硫酸，用于制备气凝胶。对原料碱处理条件和冻干过程中的预冻温度进行了优化。发现碱处理对气凝胶的吸水和吸油能力没有显着影响，但可以通过改变预冻温度进行调节。尽管产生的气凝胶最初是两亲性的，但疏水表面是通过甲基三甲氧基硅烷 (MTMS) 的气相沉积获得的，并且这些材料具有高达 32 的高吸附能力。泵油为 24 cm3 g-1 (28.56 g g-1)，氯仿为 26.77 cm3 g-1 (39.59 g g-1)。这与通过溶胶-凝胶法从新鲜纤维素材料制备的气凝胶相当，因为它们的吸附能力在 14-45 g g-1 的范围内变化。