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Researchers from Nanjing Forestry University in the People's Republic of China have developed a multifunctional air filter paper with flame retardant, antibacterial, and hydrophobic properties. The paper was prepared using chemical treatment with pre-synthesized N, N-biguanide-diethyl phosphonic acid (AGDEPA) and octadecyl trichlorosilane (OTS). The air filter paper demonstrated self-extinguishing behavior, met industry standards for flame retardant materials, and showed high efficiency in killing E. coli and S. aureus bacteria. The addition of mercerized fibers also improved the air permeability of the filter paper. This research has been peer-reviewed and published in the Journal of Environmental Chemical Engineering. [Extracted from the article]