Use of Sulfuric Acid-Impregnated Biochar Catalyst in Making of Biodiesel From Waste Cooking Oil Via Leaching Method by Muhammad Ihsan Sofyan, Putri Julpa Mailani, Avi Waras Setyawati, Susi Sulistia, Fuzi Suciati, Latifah Hauli, Reza Audina Putri, Sun Theo C. L. Ndruru, Rista Siti Mawarni, Yenny Meliana, Nurhayati Nurhayati, Joelianingsih Joelianingsih

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