Abstrak: Teknik recovery emas (Au) yang berkembang bersifat berbahaya dan berdampak buruk terhadap lingkungan. Penelitian ini bertujuan untuk mensintesis adsorben ramah lingkungan termodifikasi secara kimia dengan asam sulfat dari kulit mangga. Adsorben hasil sintesis selanjutnya diaplikasikan sebagai adsorben selektif emas (Au) dalam larutan. Nilai kapasitas, konstanta laju dan energi adsorpsi ditentukan dengan uji kinetika adsorpsi. Sintesis adsorben dilakukan dengan modifikasi menggunakan

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... O4 dengan bahan dasar kulit mangga sehingga membentuk struktur taut ulang (cross-link). Produk sintesis dikarakterisasi menggunakan FTIR dan SEM sebelum maupun sesudah menyerap emas. Data kandungan emas setelah proses adsorpsi diukur dengan alat AAS. Spektra FTIR menunjukan keberhasilan sintesis adsorben kulit mangga termodifikasi asam sulfat dan interaksinya dengan emas (Au), yaitu pada bilangan gelombang 1118,71 cm -1 yang menunjukkan ikatan C-O-C linkage yang terjadi antar selulosa dan pelebaran pada 3433,29 cm -1 akibat interaksi antara gugus OH dan Au(III). Hasil SEM menunjukan perbedaan morfologi permukaan adsorben sebelum dan sesudah menyerap emas yang terjadi karena penutupan rongga adsorben akibat peristiwa adsorpsi-reduksi Au(III). Proses adsorpsi emas oleh adsorben yang disintesis mengikuti model kinetika orde dua semu (pseudo-2) dengan nilai kapasitas, konstanta laju, dan energi adsorpsi adalah 130 mmol kg -1 , 0,1137 mM -1 s -1 dan 5442,72 J mol -1 . Abstract: Gold (Au) recovery techniques that are commoly used were dangerous and have a negative impact on the environment. This study aims to synthesize eco-friendly adsorbent prepared from chemically modified with sulfuric acid from mango peel. The synthesized adsorbent was then applied as a selective absorbent for gold (Au) in solution. Capacity, rate constant and adsorption energy were determined by adsorption kinetics test. The synthetic of adsorbent was carried out by H2SO4 modification to form a cross-link structure with mango peel as a basic material. Synthesized products before and after adsorption are characterized by FTIR and SEM. Data on gold content after the adsorption process was measured by AAS. FTIR spectra showed the synthesis of sulfuric modified mango peel adsorbent at 1118,71 cm -1 that associated C-O-C linkage between cellulose was successful and its interaction with gold (Au) was showed at 3433,29 cm -1 broad band that associated the interaction of OH groups and Au (III). SEM image showed differences in the morphology of the adsorbent surface before and after adsorbing gold because the hole closed on adsorbent, it was caused by Au(III) adsorption-reduction. The adsorption process of gold by the adsorbent synthesized followed pseudo-second order kinetics (pseudo-2) with capacity values, rate constants, and adsorption energies were 130 mmol kg -1 , 0.1137 mM -1 s -1 and 5442.72 J mol -1 .