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ZIF-8 Modified Nanofiber Composite Window Screen for Efficient Indoor PM2.5 and Formaldehyde Removal
Fan Liu,Tong Lu,Wanjun Bu,Hewei Xiang,Junjie Yang,Junli Li,Xu Zhao,Weili Shao,Qingqing Ni,Jianxin He 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
Because people spend a lot of time indoors every day, the presence of particulate matter with a diameter less than2.5 μm (PM2.5) and volatile organic molecular substances in indoor air adversely affect public health. These toxic compoundscan be removed from the air using high-efficiency air-filter materials with adsorption capacity. Metal-organic frameworks(MOFs) are among the most suitable materials for air purification as they are synthetic porous materials with excellentadsorption ability. In this study, the zeolitic imidazolate framework-8 (ZIF-8) is uniformly grown on the surface ofpolyacrylonitrile (PAN) nanofibers using an in situ growth method to prepare ZIF-8@PAN nanofiber composite membranes. The nanofiber composite membrane effectively removes PM2.5 and formaldehyde from the air. After loading the optimalamount of ZIF-8, the filtration efficiency of the nanofiber membrane for salt aerosol with a diameter of 0.3 μm increases from90.3 % to 96.9 %, and the removal rate of formaldehyde becomes 98 % within 20 min in the enclosed space of the laboratory. Moreover, after five repeated tests, the formaldehyde adsorption rate remains above 80 %. In addition, ZIF-8@PANnanofiber membranes are used to fabricate anti-haze window screens, which have great potential to improve indoor airquality and mitigate related health risks.
Experimental study of TiO2 hollow microspheres removal on elemental mercury in simulated flue gas
Jiang Wu,Xian Li,Jian-Xing Ren,Xuemei Qi,Ping He,Bu Ni,Chong Zhang,Chengzhen Hu,Jun Zhou 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.32 No.-
TiO2 hollow sphere was synthesized by hydrothermal method using trifluoroacetic acid (TFA) andTi(SO4)2 as raw materials, and it was applied to photocatalytic oxidization of elemental mercury (Hg0) inthe simulated flue gas. The prepared samples were well characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectronspectroscopy (XPS), UV–vis diffuse reflectance spectra (UV-vis DRS) and nitrogen adsorption/desorption. The results showed that only anatase phase TiO2 hollow sphere was obtained. The average diameter ofTiO2 hollow spheres was about 800 nm and the shell thickness was about 200–400 nm. When M, themolar ratio of TFA to Ti(SO4)2, was higher than a certain value, the photocatalytic activity of preparedTiO2 hollow spheres began to reduce. When M = 2, addition TFA content was the best quantity, which gotthe best TiO2 hollow spheres and provided the most appropriate F decomposed from TFA during thesample preparation, which was helpful to its photocatalytic ability. In the experimental temperaturerange, the photocatalytic oxidation efficiency decreased with the increasing of reaction temperature, andthe intensity of UV irradiation had an important effect on the photocatalytic reaction. When UVirradiation intensity was 303.45 mW cm 2 and reaction temperature was 55 8C, TiO2 hollow spheresample prepared at M = 2 had the highest photocatalytic ability and the mercury removal efficiencyreached up to 82.75%.
Photocatalytic oxidation of gas-phase Hg0 by carbon spheres supported visible-light-driven CuO–TiO2
Jiang Wu,Chaoen Li,Xiantuo Chen,Jing Zhang,Lili Zhao,Tianfang Huang,Tao Hu,Chong Zhang,Bu Ni,Xiao Zhou,Pankun Liang,Wenbo Zhang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
A simplified approach for the fabrication of CuO/TiO2@C is demonstrated. In this study, low cost CuO/TiO2@C photocatalysts (CSs loading 0.25–2 wt.%) were prepared, characterized and evaluated for gasphaseHg0 oxidation. The obtained CuO/TiO2@C photocatalysts were used to remove gaseous elementalmercury under UV light and LED respectively, and the optimum doping of content of CSs was determined. The results showed that the CuO/TiO2@C photocatalysts were highly efficient in oxidizing Hg0, reachingabove 64% when the CSs doping reached 0.5 wt.%. We have proposed that the probable mechanism bywhich CuO/TiO2@C photocatalysts remove gaseous elemental mercury: with CSs doping, CSs can act assensitizer and transfer electrons to the semiconductors, triggering the formation of very reactive radicalsto improve photocatalytic efficiency.