| The influence of indoor environmental pollution on human health is a hot topic in recent years.With the rapid development of economic level,people have higher and higher requirements for green and healthy life.Problems such as formaldehyde pollution and microbial pollution brought by luxurious indoor decoration directly affect the quality of indoor life and pose a serious threat to human health.Its seriousness and universality cannot be ignored.In this study,the Ti O2 material which is most commonly studied in formaldehyde treatment was selected as the main body.By means of noble metal deposition and semiconductor composite,the composition and structure of Ti O2/Cu2O/Pt composite with the best photocatalytic performance was prepared.Then,the multifunctional textiles with formaldehyde removal and antibacterial properties were prepared on non-woven fabrics by the dip rolling process.It is of great significance for creating high-quality indoor life.The main research contents and results are as follows:?1?Guided by the theory of plasma-resonance effect of noble metal materials,Ti O2/Pt schottky junction was constructed to broaden the response range of Ti O2 to visible light and prevent carriars combination in the photocatalytic process.Firstly,highly dispersed Ti O2 was prepared by hydrothermal method at low temperature,and then Ti O2/Pt was obtained by liquid phase deposition method with Ti O2 as the base.The characterization of the sample was done to analyse morphology,structure and composition by various analytical instruments.TEM test showed that Ti O2 was spindle-shaped with a diameter of less than 20 nm and uniform.Pt was evenly attached to the surface of Ti O2.XRD analysis show that the crystal pattern of the sample was the same as anatase Ti O2.According to Photocatalytic tests,the dregradation for the Ti O2/Pt was significantly better compared with pure Ti O2,and the photocatalytic degradation efficiency of methyl orange was twice that of commercial P25 for the samples with the optimal composite amount under simulated sunlight irradiation.?2?The double surface effect of hollow structural materials has obvious advantages in the field of photocatalysis.Based on the experimental conclusions of the first part,the sample structure was further designed,and Cu2O was introduced to construct the hollow structure composite material.First,the hollow Ti O2/Cu2O composite material was obtained by controlling quantity of copper acetate,then with Ti O2/Cu2O as the base,ternary Ti O2/Cu2O/Pt composite material was obtained by controlling the H2Pt Cl6 concentration.According to the BET test,the hollow structure effectively improves the adsorb ability of the sample.The results of photocatalytic test showed that the hollow Ti O2/Cu2O/Pt composite material catalyzed MO under visible light and could photocatalyze degradation of 97%MO within 40 min.Experiments showed that h+was the mainly effective radicals in the photocatalytic process.?3?Optimization of Ti O2/Cu2O/Pt composite for finishing of non-woven fabrics and evaluation of its formaldehyde removal performance.The Ti O2/Cu2O/Pt composite was arranged into non-woven fabrics by the dip rolling method.By exploring the influence of catalyst concentration,finishing temperature,finishing time and other technological conditions on the performance of formaldehyde removal,the optimal finishing process for formaldehyde removal was obtained:the catalyst concentration was prepared as 2 g/L,the finishing temperature was 50?,and the finishing time was 10 min.At the same time,the effects of environmental factors such as initial concentration of formaldehyde and illumination on the formaldehyde removal performance of loaded nonwoven fabrics under optimal functional finishing conditions were discussed.According to the studies,that in a certain range,the initial concentration of formaldehyde is inversely proportional to its removal effect.When the initial concentration was set at 0.578 mg/m3,the removal rate of formaldehyde in non-woven fabrics under load for 2 h reached 93.75%.The cyclic stability experiment shows that it has good cyclic usability.?4?The antibacterial properties and practical durability of Ti O2/Cu2O/Pt supported nonwoven fabrics were studied.The antibacterial test of the loaded non-woven fabric was carried out by means of oscillating method and bacteriostatic ring method.The test results showed that the antibacterial performance of the loaded non-woven fabric was excellent,and the antibacterial rate of escherichia coli and staphylococcus aureus were both more than 99.5%.According to the mechanical properties,Ti O2/Cu2O/Pt had no damage to the morphological structure of the fabric itself,and had no impact on its durability in practical applications.The formaldehyde removal mechanism and antibacterial mechanism of Ti O2/Cu2O/Pt supported non-woven fabrics were proposed.To sum up,based on the composition,structure and properties of nanomaterials as a starting point,the relationship between the preparation of the photocatalytic activity of good multi-function Ti O2/Cu2O/Pt ternary composites,and the non-woven fabric was selected as the carrier,obtained a functional non-woven fabric that had both of the great formaldehyde removal performance and antibacterial properties after finishing.This subject combines the material preparation technology with the textile dyeing and finishing process,It has effectively solved the problems of formaldehyde pollution in indoor environment,also eliminated the concern of secondary pollution caused by the breeding of bacteria in the long-term recycling process.It will realize the unification of purification and beautification of indoor living environment,and provide a new solution for green and efficient control of indoor environmental pollution. |
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