摘要
甲醛是最主要的室内VOC污染源之一,目前常用多孔材料加以吸附。然而,这些吸附材料的吸附能力和使用周期均有限。亚氯酸钠(NaClO_(2))在酸性条件下释放得到二氧化氯(ClO_(2)),可将甲醛氧化为二氧化碳。但NaClO_(2)在常规条件下易于吸湿和分解,极不稳定。采用乳化交联法将NaClO_(2)作为芯材,将具有高生物相容性的天然高分子材料海藻酸钠(SA)和羧甲基纤维素钠(CMC-Na)作为壁材,制备NaClO_(2)复合凝胶微球以提高其稳定性和缓释性能。借助SEM、DLS、FTIR、TGA等分析测试仪器对所得微球进行形貌、官能团及热性能表征,并通过降解实验评价NaClO_(2)复合凝胶微球去除气态甲醛的能力。结果表明,制备的NaClO_(2)复合凝胶微球呈现规整球形,平均粒径为662.5 nm,具备良好的热稳定性能;当pH为6.5,甲醛初始质量浓度为4 mg/m^(3)时,250 mgNaClO_(2)复合凝胶微球表现出持续降解甲醛的能力,在前5 min对甲醛的降解率已达60.00%,30 min时对甲醛的降解率可至90.45%。由此可见,NaClO_(2)复合凝胶微球有望用于空调滤网或者室内装饰纺织品,起到吸附甲醛、净化室内空气的功效。
Formaldehyde is one of the most important indoor VOC pollution sources,and it is often adsorbed by porous materials.However,these adsorbent materials have limited adsorption capacity and service life.Sodium chlorite(NaClO_(2))releases chlorine dioxide(ClO_(2))under acidic conditions,which can oxidize formaldehyde to carbon dioxide.Meanwhile,NaClO_(2)is prone to moisture absorption and decomposition,it is extremely unstable under conventional conditions.NaClO_(2)composite gel microspheres were prepared by emulsion crosslinking method with NaClO_(2)as core material and high biocompatible natural polymer materials sodium alginate(SA)and sodium carboxymethyl cellulose(CMC-Na)as wall material to improve their stability and slow release performance.The morphology,functional groups and thermal properties of the obtained microspheres were characterized by SEM,DLS,FTIR and TGA,and the ability of NaClO_(2)composite gel microspheres to remove gaseous formaldehyde was evaluated by degradation experiments.The results showed that the prepared NaClO_(2)composite gel microspheres were structured and spherical,with an average particle size of 662.5 nm,and had good thermal stability.When the pH was 6.5 and the initial mass concentration of formaldehyde was 4 mg/m^(3),the 250 mg NaClO_(2)composite gel microspheres showed the ability of continuous degradation of formaldehyde,and the degradation rate of formaldehyde reached 60.00%in the first 5 min and 90.45%in 30 min.It could be seen that NaClO_(2)composite gel microspheres were expected to be used in air conditioning filters or interior decoration textiles to adsorb formaldehyde and purify indoor air.
作者
陈秋蓉
罗艳
CHEN Qiurong;LUO Yan(College of Chemistry and Chemical Engineering,Donghua University,Shanghai 201620,China;Key Laboratory of Science&Technology of Eco-Textile,Ministry of Education,Donghua University,Shanghai 201620,China;National Manufacturing Innovation Center of Advanced Dyeing and Finishing Technology,Donghua University,Shanghai 201620,China)
出处
《印染助剂》
CAS
2024年第8期33-37,共5页
Textile Auxiliaries
关键词
乳化交联
复合凝胶微球
甲醛降解
控制释放
emulsion crosslinking
composite gel microspheres
formaldehyde degradation
controlled release
