Analit: Analytical and Environmental Chemistry Volume 7, No. 01. April 2022 https://dx.doi.org/10.23960%2Faec.v7i1.2022.p54-67 Anal.Environ.Chem. 54 STUDI KARBON AKTIF KAYU BAKAU (Rhizophora mucronata) SEBAGAI ADSORBEN PEWARNA TEKSTIL BIRU TUA KODE 5 MENGGUNAKAN SPEKTROFOTOMETER UV-VIS Mesy Cintia 1 , Ni Luh Gede Ratna Juliasih 1 , Dian Herasari 1 , Agung Abadi Kiswandono 1 , R. Supriyanto 1* 1 Jurusan Kimia, Fakultas MIPA, Universitas Lampung, Bandarlampung, 35145 email korespondensi : mesycintia0823@gmail.com Diterima 04.04.2022 Direvisi 18.04.2022 Dipublikasikan 21.04.2022 © Penulis 2022 PISSN 2540-8224 EISSN 2540-8267 Penerbit: Jurusan Kimia FMIPA Universitas Lampung ABSTRAK Limbah industri batik yang bersifat non-biodegradable dapat menyebabkan pencemaran lingkungan. Pencemaran ini dapat diatasi dengan adsorpsi karbon aktif menggunakan salah satu bahan baku kayu bakau (Rhizophora mucronata). Pembuatan karbon aktif ini bertujuan untuk mengetahui kondisi optimum dan kinetika adsorpsi karbon aktif kayu bakau sebagai adsorben pewarna tekstil biru tua kode 5. Penelitian ini dilakukan aktivasi fisika pada suhu 500 ºC dan aktivasi kimia menggunakan aktivator H 3 PO 4 10%. Rendemen karbon aktif yang diperoleh sebesar 60,4% dan telah memenuhi baku mutu karbon aktif menurut SNI 06-3730-1995. Karbon aktif yang dihasilkan dikarakterisasi menggunakan SEM-EDX, hasilnya menunjukkan bahwa struktur pori karbon tidak teraktivasi belum terbentuk secara sempurna, sedangkan pori pada karbon aktif sudah terbentuk secara sempurna. Uji adsorpsi karbon aktif kayu bakau terhadap zat pewarna tekstil biru tua kode 5 mencapai kondisi optimum dengan penambahan massa adsorben sebanyak 0,1 gram pada pH 3 dengan waktu kontak 120 menit dan pada konsentrasi adsorbat 100 mg/L. Kata kunci: bakau, karbon aktif, pewarna tekstil. ABSTRACT Batik is one of the textile industry products that use textile dyes in the batik production process. Textile dye waste produced is non-biodegradable waste that can cause environmental pollution. This pollution can be overcome by adsorption of activated carbon using one of the raw materials of mangrove wood (Rhizophora mucronata). The purpose of this activated carbon manufacture is to determine the optimum conditions and the adsorption kinetics of mangrove activated carbon as an adsorbent for dark blue textile dye code 5. This study was carried out with physical activation at a temperature of 500 ºC and chemical activation using 10% H 3 PO 4 activator. The yield of activated carbon obtained is 60.4% and has met the quality standard of activated carbon according to SNI 06-3730-1995. The resulting activated carbon was characterized using SEM-EDX with a magnification of 5000x which indicates that the pore structure of the unactivated carbon has not been completely formed, while the pores on the activated carbon have been completely formed. The adsorption test of activated carbon in mangroves against dark blue textile dye code 5 reached the optimum condition with the addition of an adsorbent mass of 0.1 grams at pH 3 with a contact time of 120 minutes and an adsorbate concentration of 100 mg/L. The dark blue textile dye adsorption model code 5 tends to follow the Freundlich adsorption isotherm model with a correlation coefficient (R2) of 0.96. Keywords: mangroves, activated carbon, textile dyes.