Basic Magnesium Chloride Whisker Photocatalytic Materials: Synthesis and Toluene Degradation Efficiency

Abstract

This study brings a novel magnesium oxychloride cement-based photocatalytic material. Basic magnesium chloride whisker (BMCW) was modified by nano-SiO 2 to improve the loading capacity of TiO 2 . TiO 2 is supported in BMCW/SiO 2 to form the basic magnesium chloride whisker based photocatalytic materials (BMCWPM). The effect of pH value and TiO 2 supporting concentration on physics and chemical properties and photocatalytic performance were investigated. BMCWPM synthesized with 5% TiO 2 supporting concentration (pH=7.55) shows the bigger specific surface area and higher UV absorption intensity. When the pH value of TiO 2 hydrosol is 7.55 ~ 8.66, the hydrosol loading BMCWPM had the best degradation efficiency of gaseous toluene in 3 h. When the loading concentration of TiO 2 hydrosol is more than 5%, its photocatalytic degradation efficiency and reaction rate of toluene are exceeding 55% and 22.7*10 -7 mol/m 2 min. Meanwhile, BMCWPM shows excellent photocatalytic circle stability. This study provides a kind of photocatalytic material with high efficiency and durability, which is expected to apply in the field of air purification.

Keywords: Basic magnesium chloride whisker, Photocatalytic, TiO2, Magnesium oxychloride cement, Toluene degradation