这项研究的目的是开发和评估壳聚糖接枝共聚物/HZSM5沸石席夫碱纳米纤维,用于从水性介质中吸附Cu2和Zn2。通过静电纺丝制备了纳米纤维,并使用XRD对其进行了表征,FTIR,1HNMR,FESEM,TGA,BET,和XPS。该研究评估了未修饰的HZSM5和席夫碱官能化对吸附能力的影响。在壳聚糖接枝共聚物中加入10.0wt%的沸石席夫碱作为最佳含量,显着增强了吸附,Zn2+和Cu2+分别增加98.2%和42.2%。具体来说,Zn2+吸附量从27.6mg/g增加到54.7mg/g,和Cu2+从67.1到95.4mg/g。温度等因素,pH值,吸附时间,和初始阳离子浓度进行了分析。动力学研究揭示了双指数模型,等温线分析表明与Redlich-Peterson模型非常吻合,显示Cu2+的最大单层容量为310.1mg/g,Zn2+的最大单层容量为97.8mg/g(pH6.0,240分钟,45°C)。吸附热力学表明自发和吸热吸附。可重复使用性测试显示五个循环后的最小容量损失(Cu2+为4.91%,Zn2+为5.59%)。纳米纤维在多离子系统和实际电镀废水中对Cu2+比Zn2+显示出更高的选择性,突出了其有针对性的重金属去除潜力。
The objective of this research was to develop and assess chitosan-grafted copolymer/HZSM5 zeolite Schiff base nanofibers for Cu2+ and Zn2+ adsorption from aqueous media. Nanofibers were prepared via electrospinning and characterized using XRD, FTIR, 1H NMR, FESEM, TGA, BET, and XPS. The study evaluated the effect of unmodified HZSM5 and Schiff base functionalization on adsorption capacities. Incorporating 10.0 wt% zeolite Schiff base as the optimum content into the chitosan-grafted copolymer significantly enhanced adsorption, achieving increases of 98.2 % for Zn2+ and 42.2 % for Cu2+. Specifically, Zn2+ adsorption increased from 27.6 to 54.7 mg/g, and Cu2+ from 67.1 to 95.4 mg/g. Factors such as temperature, pH, adsorption time, and initial cation concentration were analyzed. Kinetic studies revealed a double-exponential model, and isotherm analysis indicated a good fit with the Redlich-Peterson model, showing maximum monolayer capacities of 310.1 mg/g for Cu2+ and 97.8 mg/g for Zn2+ (pH 6.0, 240 min, 45 °C). The adsorption thermodynamics indicated a spontaneous and endothermic adsorption. Reusability tests showed minimal capacity loss (4.91 % for Cu2+ and 5.59 % for Zn2+) after five cycles. The nanofiber displayed greater selectivity for Cu2+ over Zn2+ in multi-ion systems and real electroplating wastewater, highlighting its potential for targeted heavy metal removal.