Study On Moldinhibiting For The Sphagnum/Diatomite Composite Humidity-Controlling Materials

Indoor air environment includes indoor hot and humid environment and indoor air quality.In the hot summer and cold winter areas in southern my country,the indoor humidity is high and molds and other microorganisms are prone to breed.They have a serious impact on the health and comfort of residents.Considering the goal of creating a good indoor air environment and building energy saving,it is of great significance to develop anti-fungal and humidity control materials.In this paper,based on the preliminary experiments of the research group,a more systematic study of the properties of Paecilomyces variabilis,Aureobasidium pullulans and Aspergillus flavus of the sphagnum/diatomite composite humidity control material was carried out.In view of the characteristics of Aspergillus flavus that are more harmful to humans and more difficult to inhibit,the method of compounding Mg O in the humidity control material can improve the ability of the material to inhibit Aspergillus flavus.Through the determination of O₂^-in the vanadium iron slag and Mg O solution,the determination of mycelial leakage,and the analysis of ESEM,TEM,EDS,etc.,the mechanism of the humidity control material and its composition to inhibit mold was studied.Research indicates:1)For the observation medium test,the germination time of the humidity-conditioning material against Paecilomyces variabilis and Aureobasidium pullulans were 21 and 28 days respectively;for the inorganic salt medium test,the humidity-conditioning material has a good effect on the two kinds of molds.Inhibition effect,mildew resistance level is 0.Through the research on the inhibition of molds by the components of the humidity-controlling material,it is determined that the vanadium iron slag is the main antibacterial component of the humidity-controlling material.2)The compound Mg O greatly improves the ability of the humidity control material to inhibit Aspergillus flavus.3)Through the mycelial growth inhibition test,it was concluded that the diameters of the mycelial colonies of Aureobasidium pullulans,Paecilomyces variabilis,and Aspergillus flavus in the nano-Mg O group were 0.7,0,and 1.72 cm,respectively.Observed by optical microscope,the law of mold spore germination after 18 hours of culture is as follows:control group>humidity control material group>vanadium iron slag group>nano Mg O group.The mold hyphae undergo the action of humidity control material,vanadium iron slag and nano Mg O The rule of damage degree after days is:nano-Mg O group>vanadium iron slag group>humidity control material group.4)The analysis of mycelial leakage,TEM,ESEM,EDS,etc.showed that mold cells were damaged after being treated with vanadium iron slag and Mg O,resulting in changes in cell permeability,affecting normal cell metabolism and even death.5)According to the O₂^-color reaction,the aqueous solution of vanadium iron slag and Mg O can produce O₂^-,and the strong oxidizing property of O₂^-can oxidize part of the cell tissue and cause cell damage or even inactivation.Ferro-vanadium slag,nano-Mg O,etc.can produce OH^-and Mg⁺when dissolved in water.In addition,due to the small particle size,large specific surface area,and strong adsorption of nano-Mg O,it can cause mechanical damage to cells.