Electronic Theses and Dissertation

Telah dilakukan sintesis ganggang merah laut sabang sebagai nanokomposit biokarbon ganggang merah teraktivasi magnetik untuk adsorpsi zat warna methylene blue (mb) dan remazol brilliant yellow fg (rby). ganggang merah diambil di laut sabang aceh dan dilakukan identifikasi. karakterisasi sampel dilakukan menggunakan fourier transform infrared (ftir), scanning electron microscopes (sem), x-ray diffraction (xrd) dan particle size analyzer (psa). hasil identifikasi menunjukkan bahwa ganggang merah laut sabang tersebut merupakan spesies halymenia durvillei. hasil penelitian menunjukkan nanokomposit biokarbon ganggang merah teraktivasi magnetik dapat dibuat pada perbandingan komposisi ganggang merah:koh yaitu 1:0,5 (gm(ni)0,5). hasil adsorpsi menunjukkan bahwa kondisi optimum adsorpsi untuk zat warna mb terjadi pada ph 10, waktu adsorpsi 80 menit, massa adsorben 0,1 g dan konsentrasi adsorbat 35 mg/l dengan efisiensi penyerapan (%e) adalah 95,99% serta kapasitas adsorpsinya 16,799 mg/l; sedangkan untuk adsorpsi zat warna rby, kondisi adsorpsi optimum terjadi pada ph 4, waktu adsorpsi 60 menit, massa adsorben 0,2 g dan konsentrasi adsorbat 35 mg/l dengan %e 89,94% serta kapasitas adsorpsinya 7,869 mg/l. model isoterm adsorpsi yang sesuai untuk adsorpsi zat warna mb adalah isoterm freundlich dengan r2 = 0,9914 dan untuk adsorpsi zat warna rby adalah isoterm langmuir dengan r2 = 0,995. nanokomposit biokarbon gm(ni)0,5 lebih efisien dalam mengadsorpsi zat warna kationik (mb) dibandingkan zat warna anionik (rby) setelah 15 kali pengulangan. sesuai dengan hasil regenerasi, dimana pada pengulangan ke-15, %e mb lebih tinggi dibandingkan dengan %e rby yaitu berturut-turut 83,02% dan 67,08%. nanokomposit biokarbon gm(ni)0,5 terbukti dapat meningkatkan sisi aktif adsorben untuk adsorpsi zat warna mb dan rby. kata kunci : ganggang merah, nanokomposit, adsorpsi, isoterm, methylene blue dan remazol brilliant yellow, sabang.

Synthesis of red algae from the Sabang Sea has been carried out as a magnetically activated red algae biocarbon nanocomposite for the adsorption of methylene blue (MB) and remazol brilliant yellow FG (RBY) dyes. Red algae were taken from the sea in Sabang, Aceh, and aid was carried out. Sample characterization was carried out using Fourier transform infrared (FTIR), scanning electron microscopes (SEM), X-ray diffraction (XRD) and particle size analyzers (PSA). The results showed that the red algae from the sea in Sabang is a species of Halymenia durvillei. The results showed that the magnetically activated red algae biocarbon nanocomposite could be prepared at a red algae:KOH composition ratio of 1:0.5 (GM(Ni)0.5). The adsorption results showed that the optimum adsorption conditions for MB dyes occurred at pH 10, with an adsorption time of 80 minutes, an adsorbent mass of 0.1 g and an adsorbate concentration of 35 mg/L with absorption efficiency of 95.99% and an adsorption capacity of 16,799 mg/l, while for the adsorption of RBY dye, the optimum adsorption conditions occurred at pH 4, with an adsorption time of 60 minutes, adsorbent mass of 0.2 g and an adsorbate concentration of 35 mg/L with %E of 89.94% and an adsorption capacity of 7,869 mg/L. The adsorption isotherm model suitable for the adsorption of MB dyes is the Freundlich isotherm with R2 = 0.9914, and for the adsorption of RBY dyes, it is the Langmuir isotherm with R2 = 0.995. GM(Ni)0.5 biocarbon nanocomposite is more efficient in adsorbing cationic dyes (MB) than anionic dyes (RBY) after 15 repetitions. In accordance with the results of regeneration, at the 15th iteration, %E MB was higher than %E RBY, namely 83.02% and 67.08%, respectively. GM (Ni)0.5 biocarbon nanocomposite has been shown to increase the active site of the adsorbent for the adsorption of MB and RBY dyes. Keywords : Red algae, nanocomposit, adsorption, isotherm, methylene blue and remazol brilliant yellow, Sabang.