Porous Boron Nitride And Pt-loaded Mg-Al Layer Double Hydroxidefor Removal Of Indoor Formaldehyde

Formaldehyde is recognized as a major indoor air pollutant.Unprecedented use of building and furnishing materials results in a higher emission of indoor HCHO than ever.Prolonged exposure to even a few parts per million?ppm?of HCHO may cause serious health problems including respiratory diseases,nasal tumors and skin irritation.Therefore,the development of efficient methods and materials for the removal of indoor HCHO is essential to meet human health needs.Many methods such as adsorption,plasma technical oxidation,photocatalytic degradation and thermal catalytic oxidation decomposition have been investigated and developed for the removal of indoor formaldehyde in air.Among these methods,adsorption and room-temperature oxidation decomposition methods offer feasible strategies for the removal of indoor formaldehyde due to their low cost and easy operation.In this paper,we studied the porous boron nitride and Pt-loaded Mg-Al layered double hydroxide for use in room-temperature removal of indoor formaldehyde.The main contents are summarized as follows:?1?Highly porous boron nitride compose of interconnected flexible network of nanosheets was prepared via a facile thermal treatment process characterized by X-ray diffraction,field emission scanning electron microscopy,transmission electron microscopy,Fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy and nitrogen adsorption.The as-prepared sponge-like boron nitride displayed large ultra-high adsorption capacities and fast adsorption rates for gaseous formaldehyde in air due to the abundance of surface hydroxyl and amino groups,its low density,suitable pore size and porous structure and large specific surface area.Moreover,Cannizzaro-type disproportional reaction can take place on the surface of BN layer and HCHO can be converted into less toxic formate acid?HCOOH?and methanol?CH₃OH?without extra modification.Such hierarchical porous BN is a promising and environmental friendly adsorbent applied for indoor formaldehyde purification.?2?Room-temperature catalytic decomposition of formaldehyde?HCHO?is regarded as one of the best methods for indoor HCHO purification and removal.Herein,for the first time,flexible and bendable Mg-Al layered double hydroxide?LDH?on aluminum?Al?foil was in-situ prepared and further decorated by platinum?Pt?nanoparticles?NPs?for catalytic oxidation decomposition of HCHO at room temperature.Such a Pt-loaded large-area flexible LDH catalyst can be directly used and easily regenerated because of its flexibility and relatively low production cost.Moreover,it exhibited an excellent catalytic performance toward oxidation decomposition of HCHO at room temperature due to its hierarchical macro-/mesoporous structure that facilitates the diffusion of reactants and products.Furthermore,abundant hydroxyl groups on the catalyst surface are also beneficial to the HCHO oxidation decomposition.This work may provide some new insight into the design and fabrication of advanced catalyst for indoor HCHO removal and air purification.