Access to clean water has become increasingly difficult, motivating the need for materials that can efficiently remove pollutants. Hydrogels have been explored for remediation, but they often require long times to reach high levels of adsorption. To overcome this limitation, we developed a rapid, locally formed hydrogel that adsorbs dye during gelation. These hydrogels are derived from cellulose—a renewable, nontoxic, and biodegradable resource. More specifically, we found that sulfated cellulose nanofibers or sulfated wood pulps, when mixed with a water‐soluble, cationic cellulose derivative, efficiently remove methylene blue (a cationic dye) within seconds. The maximum adsorption capacity was found to be 340 ± 40 mg methylene blue/g cellulose. As such, these localized hydrogels (and structural analogues) may be useful for remediating other pollutants.

中文翻译：

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基于纤维素纳米纤维和木浆的局部水凝胶，可快速去除亚甲基蓝

获得清洁水变得越来越困难，从而激发了对可以有效去除污染物的材料的需求。已经探索了水凝胶来进行补救，但是它们通常需要很长时间才能达到高吸附水平。为了克服这一局限性，我们开发了一种快速的局部形成的水凝胶，在凝胶化过程中会吸附染料。这些水凝胶源自纤维素-一种可再生，无毒且可生物降解的资源。更具体地说，我们发现硫酸化纤维素纳米纤维或硫酸化木浆与水溶性阳离子纤维素衍生物混合后，可在数秒内有效去除亚甲基蓝（一种阳离子染料）。发现最大吸附容量为340±40mg亚甲基蓝/ g纤维素。因此，