Nanocellulose (NC)-supported TiO₂ nanoparticles, termed NCTs, were prepared by an ultrasonic impregnation method. The as-synthesized NCTs were thoroughly characterized and studied for the photodegradation of mefenamic acid (MEF), an anthranilic acid derivative drug. The adsorption potential of NCTs increased with TiO₂ loading and 10 wt% TiO₂ NCT showed the highest sorption potential. Adsorption kinetics of MEF onto NC and NCTs indicated that the equilibrium was reached within 50 min. A pseudo-second-order model clearly represented the experimental kinetic data and demonstrated that the MEF sorption was mainly chemisorption. Equilibrium sorption analysis indicated that the adsorption followed the Langmuir model with a monolayer sorption capacity of 22.43 mg g⁻¹ for 10 wt% TiO₂ NCT. The photocatalytic degradation rates of NCTs were identical with respect to their adsorption capacities, and the apparent rate constant (k_app) values indicated that the amount of TiO₂ in NCTs played a vital role in the degradation of MEF. Furthermore, 10 wt% TiO₂ NCT showed excellent catalytic activity and reusability even after five cycles of photodegradation.

中文翻译：

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纳米纤维素/ TiO ₂复合材料：在水介质中制备，表征和应用潜在的内分泌干扰物甲芬那酸进行光催化降解†

通过超声浸渍法制备了纳米纤维素（NC）负载的TiO ₂纳米颗粒，称为NCT。对合成后的NCT进行了彻底的表征，并研究了邻氨基苯甲酸衍生物药物甲芬那酸（MEF）的光降解。NCTs的吸附势随TiO ₂的添加而增加，而10 wt％TiO ₂ NCT表现出最高的吸附势。MEF在NC和NCT上的吸附动力学表明，在50分钟内达到了平衡。拟二级模型清楚地表示了实验动力学数据，并证明了MEF吸附主要是化学吸附。平衡吸附分析表明，吸附遵循Langmuir模型，单层吸附容量为22.43 mg g-10 wt％TiO ₂ NCT为^-1。NCTs的光催化降解速率在其吸附容量方面是相同的，表观速率常数（ k _app）值表明NCTs中的TiO ₂含量在MEF降解中起着至关重要的作用。此外，即使在五个光降解循环后，10 wt％的TiO ₂ NCT仍显示出优异的催化活性和可重复使用性。