Study on the Anti-mold Characteristics and Physical and Mechanical Properties of Phosphogypsum Modified Synergistically by Inorganic Alkali and Quaternary Ammonium Salt
FANG Shuangming, FU Juan, LUO Jie, PENG Zhu, LI Ziling, CHENG Jinke*
School of Chemistry and Chemical Engineering, Guizhou University, Guiyang 550025, China
Abstract: Phosphogypsum building materials in Southwest China are prone to mold, which affects product quality and human health, thus restricting its resource utilization. To control mold contamination, this paper starts from the mold biological structure and suitable survival environment, using Aspergillus niger as the source of infection, and uses the mold resistance grade method, ring of inhibition method, softening coefficient and compressive strength determination to assess the anti-mold performance and the physical and mechanical performance of the materials. Structural characterization and microscopic morphology analysis were carried out by XRD, FT-IR and SEM, and a synergistic model of inorganic alkaline materials and organic quaternary ammonium salts was constructed to explore the anti-mold mechanism. The results show that doping inorganic alkali alone can only enhance the short-term mold resistance, and the degree of improvement is regulated by pH, inorganic components, and moisture absorption performance. The synergistic modification of Ca(OH)2 and quaternary ammonium salt can obtain excellent anti-mold effect and durability, but the doping of quaternary ammonium salt will deteriorate its softening coefficient and compressive strength, and the physical and mechanical properties of the specimens were better when compounded with 10% Ca(OH)2 and 0.1% CTAB by mass fraction. Ca(OH)2 and quaternary ammonium salts synergistically enhance the anti-mold effect lies in the fact that OH- and quaternary ammonium ions are stably attached to the surface of CaSO4·2H2O crystals by hydrogen bonding and electrostatic attraction, respectively, and after the former denatures the proteins of the biofilm system of mold spores, the latter intensifies the destruction of phospholipid bilayer, which speeds up the inactivation of the mold spores and improves the anti-mold property.
方双明, 付娟, 罗洁, 彭祝, 李子玲, 程金科. 无机碱与季铵盐协同改性磷石膏的抗霉特性及物理力学性能研究[J]. 材料导报, 2025, 39(3): 24010006-8.
FANG Shuangming, FU Juan, LUO Jie, PENG Zhu, LI Ziling, CHENG Jinke. Study on the Anti-mold Characteristics and Physical and Mechanical Properties of Phosphogypsum Modified Synergistically by Inorganic Alkali and Quaternary Ammonium Salt. Materials Reports, 2025, 39(3): 24010006-8.
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2025, Vol. 39 
