Sari, Hutri Puspita, et al. “Fourier Transform Infrared (FTIR) Characterization of Sulfate Ion Adsorption on One-Pot Synthesized Quaternary Ammonium Polymer Derived from Vinasse Waste ”. Eksergi, vol. 23, no. 1, Jan. 2026, pp. 39-47, doi:10.31315/eksergi.v23i1.15924.