Abstract：
Removing p-nitrophenol (PNP) from water resources is crucial due to its significant threat to the environment and human health. Herein, imidazolium ionic liquids with short/long alkyl chain ([C2VIm]Br and [C8VIm]Br) modified cellulose microspheres (MCC-[C2VIm]Br and MCC-[C8VIm]Br) were synthesized by radiation method. To examine the impact of adsorbent hydrophilicity on adsorption performance, batch and column experiments were conducted for PNP adsorption. The MCC-[C2VIm]Br and MCC-[C8VIm]Br, with an equivalent molar import amount of ionic liquids, exhibited maximum adsorption capacities of 190.84 mg/g and 191.20 mg/g for PNP, respectively, and the adsorption equilibrium was reached within 30 min. Both adsorbents displayed exceptional reusability. Integrating the findings from XPS and FTIR analyses, and AgNO3 identification, the suggested adsorption mechanism posited that the adsorbents engaged with PNP through ion exchange, hydrogen bonds and π-π stacking. Remarkably, the hydrophobic MCC-[C8VIm]Br exhibited superior selectivity for PNP than the hydrophilic MCC-[C2VIm]Br, while had little effect on adsorption capacity and rate. MCC-[C8VIm]Br-2 with high grafting yield increased the adsorption capacity to 327.87 mg/g. Moreover, MCC-[C8VIm]Br-2 demonstrated efficient PNP removal from various real water samples, and column experiments illustrated its selective capture of PNP from groundwater. The promising adsorption performance indicates that MCC-[C8VIm]Br-2 holds potential for PNP removal from wastewater.
摘要：
由于对环境和人类健康的重大威胁，从水资源中去除对硝基苯酚（PNP）至关重要。在这里，通过辐射法合成了具有短/长烷基链（[C2VIm]Br和[C8VIm]Br）修饰的纤维素微球（MCC-[C2VIm]Br和MCC-[C8VIm]Br）的咪唑离子液体。考察吸附剂亲水性对吸附性能的影响,进行了PNP吸附的批量和柱实验。MCC-[C2VIm]Br和MCC-[C8VIm]Br,离子液体的等摩尔进口量，对PNP的最大吸附容量为190.84mg/g和191.20mg/g，分别,30min内达到吸附平衡。两种吸附剂均表现出优异的可重用性。整合XPS和FTIR分析的结果，和AgNO3识别，提出的吸附机理认为吸附剂通过离子交换与PNP结合，氢键和π-π堆叠。值得注意的是,疏水性MCC-[C8VIm]Br对PNP的选择性优于亲水性MCC-[C2VIm]Br，而对吸附量和吸附率影响不大。MCC-[C8VIm]Br-2具有较高的接枝率，将吸附容量提高到327.87mg/g。此外，MCC-[C8VIm]Br-2证明了从各种实际水样中有效去除PNP，柱实验说明了它从地下水中选择性捕获PNP。具有良好的吸附性能表明MCC-[C8VIm]Br-2具有从废水中去除PNP的潜力。
