Ong1, Siew-Teng, Li-Pei Hew3, and Yung-Tse Hung4. “Utilization of Quaternized Rice Hull As Low-Cost Adsorbent for the Removal of Congo Red from Aqueous Solution”. Asian Journal of Chemistry 26, no. 2 (January 16, 2014): 389–392. Accessed November 24, 2024. https://asianpubs.org/index.php/ajchem/article/view/26_3_18.