A simple method to valorize silica sludges into sustainable coatings for indoor humidity buffering

Abstract In this study, the production of indoor humidity-buffering coatings (IHC-s) from recycling waste silica sludges by using a room-temperature sol-gel method which is simple and energy-efficient route reported. The properties these IHC-s are identified scanning electron microscope, X-ray diffraction, fluorescence spectrometer, laser particle size analyzer, N 2 adsorption-desorption isotherms toxicity characteristic leaching procedure (TCLP). moisture tests show that have buffering values ca. 270–316 g m − contents 23.6–26.7% in range 50–90% relative humidity (RH). Furthermore, capacities, rate stability significantly superior to commercially available 50–75% RH. enhancement may be due formation porous structure via dispersed gypsum transformed bassanite self-assembly process. Most importantly, prepared surpassing antimicrobial efficacy (> 99.99%) no detectable heavy metals based on TCLP tests, provides an economic environmental-friendly for recovering valorizing industrial wastes.