摘要
甲醛是室内环境中关注度最高的污染物之一,由于活性氧化锰对甲醛具有优异的室温净化性能,近年来受到了广泛关注.然而实验室合成的粉末活性锰通常难以直接应用,因此,如何制备低成本、环境友好的活性锰负载纤维材料仍然是阻碍其大面积推广需要解决的重要难题.本研究采用涂布固定法,分别用乙烯基吡咯烷酮(PVP)和羧甲基纤维素钠(CMC)胶结剂进行负载,得到不同的活性锰负载纤维材料,同时运用XRD、SEM、Raman和FTIR等方法对负载材料的表面结构进行表征,评价了不同氧化锰负载纤维材料的室温净化甲醛性能及其影响因素.结果表明,胶结剂的类型、锰氧化物的性质及载体厚度等因素是影响其净化性能的关键因子.与CMC胶结剂相比,PVP胶结剂不仅使负载的活性锰粉末更多,同时其团聚现象也不明显,这主要归因于其较为温和的粘结能力.当使用厚度为J=80 g·cm^(-2)的纤维载体时,其负载量不仅高,且透气性良好,因而其甲醛净化性能较J=60 g·cm^(-2)和100 g·cm^(-2)载体好.CO程序升温结果表明,MnO_(2)-1样品的还原温度比MnO_(2)-2样品更低,因而具有更强的低温催化能力.通过优化制备条件,使用PVP胶结剂,将MnO_(2)-1负载到J=80 g·cm^(-2)厚度的纤维载体上,得到的活性锰负载纤维材料能快速将甲醛浓度从0.47 mg·m^(-3)降低至国家标准0.08 mg·m^(-3),获得比商品更为优异的净化性能.
Formaldehyde is one of the most concerned pollutants in the indoor environment.Manganese oxides have attracted extensive attention recently because of their excellent room-temperature purification performance for formaldehyde.However,laboratory-synthesized powdered manganese oxides is often difficult to directly apply.Therefore,how to prepare low-cost and environment-friendly activated manganese-loaded fiber materials remains a bottleneck to its large-scale promotion.In this study,different manganese oxides loaded fiber materials were obtained by coating,fixing and loading with vinyl pyrrolidone (PVP) and sodium carboxymethyl cellulose (CMC) cement respectively.The surface structure of the loaded materials was characterized by XRD,SEM,Raman and FTIR techniques,and their room-temperature purification performance for formaldehyde was evaluated.The results show that the type of cementing agent,the properties of manganese oxide and the thickness of the carrier are critical factors influencing the purification performance of the synthesized materials.Compared with CMC cement,PVP cement not only allows for more loaded active manganese powder but also has less agglomeration phenomenon,mainly due to its milder bonding ability.The best thickness of the carrier is J=80 g·cm^(-2) with the highest load capacity and air permeability.The CO temperature programmed results show that the reduction temperature of the MnO_(2)-1 sample is lower than that of the MnO_(2)-2 sample,possessing excellent low-temperature catalytic ability.By optimizing the preparation conditions and using PVP cement,MnO_(2)-1 is loaded on to a J=80 g·cm^(-2) fiber carrier.The obtained manganese-loaded fiber material can quickly reduce the formaldehyde concentration from 0.47 mg·m^(-3) to 0.08 mg·m^(-3) (as determined by national standards),and the purification performance was better than that of commercial products.
作者
王晗菲
谈小克
高全龙
刘娟
倪春兰
侯静涛
WANG Hanfei;TAN Xiaoke;GAO Quanlong;LIU Juan;NI Chunlan;HOU Jingtao(College of Resources and Environment,Huazhong Agricultural University,Wuhan 430070)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第4期277-284,共8页
Acta Scientiae Circumstantiae
基金
国家自然科学基金(No.21707168)。
关键词
氧化锰负载纤维材料
净化甲醛
胶结剂
制备方法
manganese oxide loaded fiber material
purification of formaldehyde
cementing agent
preparation methods
