TSA纳米复合材料改性后纸的光触媒活性和抗菌性能

Photocatalytic activity and antimicrobial properties of paper sheets modified with TiO_2/sodium alginate nanocomposites

光触媒纸是用添加不同比例的TSA(二氧化钛/海藻酸钠)纳米复合材料制备的。改性效果用XRD、TGA谱图表征。形态学特征通过扫描电镜和X射线仪的检测来研究。通过分析废水中的化学需氧量研究改性纸页的光触媒活性。研究结果证实:向纸页中添加一定量的光催化剂后,废水矿物化并提高了化学需氧量的去除率。此外,结果还表明:海藻酸钠作为生物高聚物添加到纸页中,不但能够增加纳米复合材料对纸页纤维的粘附,还能降低光催化剂对纸页纤维的有害影响,当向纸页中添加7%到15%的TSA时,表现出较高的光触媒活性。同时,在抵抗沙门杆菌的抗菌效果上,相比其他微生物(例如白色念珠菌)的标准抗生素的抗菌效果要好。当向样品中添加15%的TSA时,抗菌效果呈现最大。此外,研究发现:当向纸基中添加20%的TSA,纸页的复合性能会被破坏。实验结果证实了该类改性纸页在卫生和食品包装领域的应用具有可行性。

Photocatalytic paper sheets were prepared by addition of different ratios of TiO2/Sodium alginate （TSA） nanocomposite. The modified paper sheets were characterized by XRD, TGA. Their morphology was studied by scanning electron microscope （SEM） and energy dispersive X-ray （EDX）. Photocatalytic activity of modified paper has been studied by analysis of chemical oxygen demand （COD） of waste-water. The results confirmed the mineralization of the waste-water and enhanced removal of chemical oxygen demand （COD） by increasing the amount of photocatalyst in the paper. Moreover, the results also confirmed that presence of sodium alginate as biopolymer increased adhesion of nanoparticles to paper fibers and reduced the harmful effect of the photocatalyst on them. The paper sheets containing 7% as well as 15% TSA showed high photocatalytic activity and anti-bacterial effect against Salmonella typhimurium higher than standard antibiotic beside other microorganisms such as Candida albicans. The maximum antimicrobial effect was found in case of specimen loaded with 15% TSA. Moreover, it was found that by adding 20% TSA to the paper matrix, the properties of the paper composite collapse. The obtained results confirm the possible utilization of the modified paper in both hygienic and food packaging applications.