The composition of graphene oxide (GO):paraffin:nanobentonite electrode was optimized to acquire the optimal working electrode to analyze nicotinic acid under the optimum conditions through cyclic voltammetry. Graphene oxide was synthesized from graphite by employing the improved Hummer method. Bentonite was synthesized using the sonothermal method. The ratio of GO:paraffin:nanobentonite electrodes of 3:3:4 provided the optimal voltammogram. The results indicated that the composition of the comparative working electrodes of GO-modified nanobentonite was best 3:3:4 with a good peak recovery averaged value of 96.16%.
Pada penelitian ini telah dilakukan penelitian pengukuran asam nikotinat menggunakan elektroda kerja Graphene oxide termodifikasi nano bentonit dengan metode voltametri siklik. Elektroda kerja Graphene oxide termodifikasi nano bentonit dibuat dengan cara mencampurkan Graphene oxide, parafin, dan nano bentonit dengan perbandingan 3:5:2, 3:4:3, 3:3:4, 3:2:5. Parameter optimasi yang diuji yaitu kondisi optimum (pH, waktu deposisi, dan laju pindai), komposisi modifier nano bentonit yang ditambahkan. Elektroda kerja Graphene oxide termodifikasi nano bentonit pada kondisi pengukuran optimum digunakan untuk menentukan analisis asam nikotinat secara voltametri siklik. Hasil penelitian menunjukkan komposisi terbaik diperoleh 3:3:4 dengan nilai puncak katodik -0.00375A. pH optimum diperoleh 5 dengan nilai puncak katodik -0.00337A. Waktu deposisi optimum diperoleh selama 5 detik dengan nilai puncak katodik -0.00144A dan laju pindai optimum diperoleh 100 mV/detik dengan nilai puncak katodik -0.00272A. Perbandingan persen perolehan kembali asam nikotinat secara voltametri siklik dengan elektroda kerja Graphene oxide termodifikasi nano bentonit lebih besar yaitu 96.164% dibandingkan dengan metode HPLC adalah 88.332%.Kata kunci : graphene oxide, nano bentonit, asam nikotinat, voltametri siklik In this research modified Graphene oxide electrode with nano bentonite has been prepared, for determination of nicotinic acid using cyclic voltammetry. Graphene oxide electrode modified by nano bentonite was made by with mixing Graphene oxide, paraffin, and nano bentonite with 3:5:2, 3:4:3, 3:3:4, 3:2:5. The observed parameters includes pH, deposition time, scan rate at modified Graphene oxide electrode with nano bentonite, and composition of modifier in modified Graphene oxide Graphene oxide electrode with nano bentonite. The results showed the best composition obtained 3:3:4 with an peak of cathodic value of -0.00375A. The optimum pH obtained 5 with an peak of cathodic value of -0.00337A.The optimal deposition time obtained for 5 seconds with an peak of cathodic value of -0.00144A and optimal scanning rate obtained 100 mV/second with an peak of cathodic value -0.00272A. Comparison of the results of nicotinic acid recovery using Graphene oxide nano bentonite modified electrode using the cyclic voltammetry method is greater that is 96.164% compared to the method HPLC is 88.332%.Key words: graphene oxide, nano bentonite, nicotinic acid, cyclic voltammetry
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