| The improvement of the national economic level has promoted the vigorous development of the home market,and various new building materials have been emerging,but at the same time,it also intensifies the indoor environmental pollution.Formaldehyde has attracted attention because of its long emission cycle.How to effectively remove the indoor residual formaldehyde has become a research hotspot in the field of air purification.At present,there are many formaldehyde purification methods,among which the environmentally friendly material adsorption of formaldehyde is a green and efficient technology.Chitosan,as a degradable organic polymer material,has been widely used in many fields due to its biocompatibility and biodegradability.The rich amino and hydroxyl groups in chitosan molecular chain can react with formaldehyde to form Schiff base to remove formaldehyde.However,due to the slow reaction process,the application of chitosan in the field of air purification is limited.The results show that inorganic or organic modification of chitosan can improve its adsorption activity to different pollutants.In this paper,manganese dioxide was loaded on chitosan needled cloth to study its removal effect on gaseous formaldehyde.In this paper,theoretical analysis and experimental research were used to study the formaldehyde removal performance of Mn O2 loaded chitosan.Firstly,the chitosan adsorption materials loaded with Mn O2 were prepared by impregnation and chemical deposition.The effects of Mn O2 addition on the morphology,crystallinity,functional group and resistance of the materials were studied by scanning electron microscopy,X-ray diffraction,Fourier transform infrared spectroscopy and single pass resistance.Secondly,the experimental study of formaldehyde purification performance was carried out in the closed microenvironment cabin circulation experimental system,and the influence of load mode,load amount,relative humidity,cleaning times and other factors on the purification efficiency,purification rate and cumulative purification amount was studied.The results show that there is a new Mn-O stretching vibration peak at 576cm-1in the infrared spectrum curve of manganese dioxide loaded on chitosan;the crystallinity of chitosan fiber is lower than that of chitosan fiber;the resistance of CS,J-CS and K-CS is increased by 9 pa,11 pa and 12 Pa for each 0.1 m/s increase of filtration rate;the formaldehyde purification efficiency of the material prepared by impregnation method is increased by 9 pa,11 pa and 12 Pa under the same experimental conditions It is higher than the material prepared by in-situ chemical deposition method;the formaldehyde purification efficiency of chitosan adsorption materials prepared by two loading methods increases with the increase of relative humidity,which is conducive to the improvement of formaldehyde purification efficiency;when in-situ chemical deposition method is used for loading,with the increase of loading,the formaldehyde purification capacity gradually increases,but after reaching a certain value,With the increase of the load,the purification efficiency decreases;with the increase of the load,the adsorption capacity of formaldehyde increases gradually,but when the load reaches a certain value,the purification efficiency does not increase;the loading mode of in-situ chemical deposition is stronger than that of the impregnation method;the accelerated test results show that cumulative purification capacity of the material is 2.5 times higher than that of the pure chitosan material. |
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