PVA/CS/PEO/PEI and PVA/CS/PEO/SA composite nanofiber membranes were successfully prepared by electrospinning technology,and their adsorption performance for Cu2+ and Congo red (CR) in water was systematically evaluated.The results showed that the average diameters of the two fiber membranes were 441.1nm and 430.0nm,respectively,and the PVA/CS/PEO/PEI membrane had better hydrophilicity and mechanical properties.The adsorption experiments indicated that the adsorption capacities of the PVA/CS/PEO/PEI membrane for Cu2+ and Congo red were significantly higher than those of the PVA/CS/PEO/SA membrane.When the initial concentrations of Cu2+ and CR were 800mg/L and 80mg/L,the adsorption time was 120min,and the pH values were 6 and 7,the PVA/CS/PEO/PEI nanofiber membrane achieved the maximum adsorption capacities of 169.79mg/g and 83.74mg/g for Cu2+ and CR,respectively.The adsorption behavior conformed to the Langmuir model,indicating a monolayer adsorption mechanism.The high-density amino groups in PEI maintained efficient and stable adsorption performance over a wide pH range through electrostatic attraction,complexation/chelation and hydrogen bonding synergy,suggesting excellent application potential of the PVA/CS/PEO/PEI nanofiber membranes in the treatment of heavy metal and dye wastewater.
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基金资助
河南省高等学校重点科研项目(25B540002);国家级大学生创新创业训练计划项目(202510465035,202410465024);河南省大学生创新创业训练计划项目(202410465026);河南省科技攻关项目(222102230065);中原工学院青年人才创新能力基金项目(K2020QN003)
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