由于NSAID污染的水对人类和生态系统的潜在危害,从水体中提取非甾体抗炎药(NSAID)势在必行。季氨基官能化表氯醇交联壳聚糖纤维(QECFs),一种经济和环保的吸附剂,使用简单温和的方法成功制备了高效的双氯芬酸(DCF)吸附。此外,制备QECFs的优化因素包括环氧氯丙烷浓度,pH值,温度,和(3-氯-2-羟丙基)三甲基氯化铵(CHTAC)浓度。QECF在7-12的宽pH范围内表现出对DCF的优异吸附性能。计算的最大吸附容量和每个吸附位点的吸附DCF量分别为987.5±20.1mg/g和1.2±0.2,根据D-R和Hill等温线模型,在pH7下在180分钟内。这种性能超过了以前报道的吸附剂。QECFs的再生可以使用0.5mol/L的NaOH溶液在90分钟内实现,QECF保留其原始纤维形式,并且在5个循环后吸附容量仅降低了9.18%。利用傅里叶变换红外光谱仪和X射线光电子能谱对QECFs进行了表征,QECF的制备机制,以及QECFs对DCF的吸附机理。通过壳聚糖和CHTAC上的氨基/羟基之间的反应,QECF中的季铵基团(R4N)得到了很好的发展,大约0.98个具有0.98个R4N+基团的CHTAC分子固定在每个壳聚糖单体上。此外,QECF上的这些R4N+对DCF的去除起到了至关重要的作用。
The extraction of non-steroidal anti-inflammatory drugs (NSAIDs) from water bodies is imperative due to the potential harm to humans and the ecosystem caused by NSAID-contaminated water. Quaternary amino-functionalized
epichlorohydrin cross-linked chitosan fibers (QECFs), an economical and eco-friendly adsorbent, were successfully prepared using a simple and gentle method for efficient diclofenac (DCF) adsorption. Additionally, the optimized factors for the preparation of QECFs included
epichlorohydrin concentration, pH, temperature, and (3-chloro-2-hydroxypropyl) trimethylammonium chloride (CHTAC) concentration. QECFs demonstrated excellent adsorption performance for DCF across a broad pH range of 7-12. The calculated maximum adsorption capacity and the amount of adsorbed DCF per adsorption site were determined to be 987.5 ± 20.1 mg/g and 1.2 ± 0.2, respectively, according to the D-R and Hill isotherm models, at pH 7 within 180 min. This performance surpassed that of previously reported adsorbents. The regeneration of QECFs could be achieved using a 0.5 mol/L NaOH solution within 90 min, with QECFs retaining their original fiber form and experiencing only a 9.18% reduction in adsorption capacity after 5 cycles. The Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy were used to study the characterization of QECFs, the preparation mechanism of QECFs, and the adsorption mechanism of DCF by QECFs. Quaternary ammonium groups (R4N+) were well developed in QECFs through the reaction between amino/hydroxyl groups on chitosan and CHTAC, and approximately 0.98 CHTAC molecule with 0.98 R4N+ group were immobilized on each chitosan monomer. Additionally, these R4N+ on QECFs played a crucial role in the removal of DCF.