甲醛和微生物是典型的室内空气污染物,研究室温下2种污染物的同步去除对于净化室内环境具有重要意义。通过溶胶-凝胶法制备了MnCeZn(记为M)催化剂,并通过碱金属(Ca、Cs、Mg、Li)对其改性,考察了不同碱金属对催化剂室温催化氧化甲醛及抑菌性能的影响,通过扫描电子显微镜、X射线衍射仪等分析了催化剂的形貌和结构。结果表明,当Cs掺杂量为3%(摩尔分数)时,3% Cs-M催化剂表现出最佳的室温催化氧化活性,24h内甲醛去除率达90%,同时兼有优异的抑制大肠杆菌生长的作用,其抑菌圈直径可达24mm。掺杂摩尔分数3%的Cs改变了金属氧化物的分布状态和团聚程度,使3% Cs-M催化剂具有甲醛去除和细菌抑制双重作用。
Formaldehyde and microorganisms are typical indoor air pollutants.It is of great significance to study the simultaneous removal of two pollutants at room temperature for purifying indoor environment.In this paper,MnCeZn catalyst (named as M) was prepared by sol-gel method and modified by alkali metals (calcium,cesium,magnesium,lithium).The effects of different alkali metals on the catalytic oxidation of formaldehyde and antibacterial properties of the catalyst at room temperature were investigated.The morphology and structure of the catalysts were analyzed by scanning electron microscopy and X-ray diffractometer.The results showed that when the doping amount of Cs was 3% (mole fraction),the 3% Cs-M catalyst exhibited the best catalytic oxidation activity at room temperature,and the removal rate of formaldehyde reached 90% within 24 h.At the same time,it had excellent inhibitory effect on the growth of Escherichia coli,and the diameter of the inhibition zone could reach 24mm.The doping of 3% Cs changed the distribution and agglomeration degree of metal oxides,so that the 3% Cs-M catalyst had the dual effects of formaldehyde removal and bacterial inhibition.
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基金资助
江苏省自然科学基金(BK20180718);江苏省研究生科研与实践创新计划项目(KYCX23-1475)
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