PEMBUATAN ELEKTRODA KERJA GRAPHENE OXIDE TERMODIFIKASI NANO BENTONIT UNTUK ANALISIS ASAM NIKOTINAT SECARA VOLTAMETRI SIKLIK MAKING OF GRAPHENE OXIDE NANO BENTONITE MODIFIED WORKING ELECTRODE FOR ANALYSIS NICOTINIC ACID USING CYCLIC VOLTAMMETRY

UNESA Journal of Chemistry Pub Date : 2020-11-29 DOI:10.26740/ujc.v9n3.p170-178

Nerry Puspita Sari, Pirim Setiarso

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Abstract

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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氧化石墨烯纳米改性膨润土分析烟酸的研究氧化石墨烯-纳米膨润土改性工作电极的制备

在这项研究的基础上，利用氧化石墨烯作为纳米膨润土的改性剂，利用太阳能电池对镍进行了研究。氧化石墨烯改性纳米膨润土的工艺流程是将氧化石墨烯、石蜡和纳米膨润土改性为3:5:2、3:4:3、3:3:4、3:2:5。优选的参数是最佳的（pH值、沉积时间和沉积时间），改性剂纳米膨润土的组成是可行的。氧化石墨烯改性纳米膨润土的工艺是在最佳条件下对镍进行电压分析。试验结果表明，在-0.00375A冲击电流下，pH值为3:3:4，在-0.00337A冲击电流下pH值为5，在-0.00144A冲击电流下5分钟内达到最佳pH值，在-0.00272A冲击电流下最佳pH值为100mV/秒氧化石墨烯修饰纳米膨润土的电化学性能比高效液相色谱法高96.164%，达88.332%。将氧化石墨烯、石蜡和纳米膨润土与3∶5∶2、3∶4∶3、3∶3∶4、3∶2∶5混合，制备了纳米膨润土改性氧化石墨烯电极。观察到的参数包括pH、沉积时间、纳米膨润土修饰氧化石墨烯电极的扫描速率以及纳米膨润土改性氧化石墨烯中改性剂的组成。结果表明，最佳组分为3:3:4，阴极值峰值为-0.00375A。最佳pH为5，阴极值峰为-0.00337A。最佳沉积时间为5秒，阴极值为-0.00144A，最佳扫描速率为100mV/秒，阴极峰为-0.00272A。烟酸测定结果的比较使用氧化石墨烯纳米膨润土修饰电极使用循环伏安法的回收率更大，为96.164%，而HPLC法为88.332%。关键词：氧化石墨烯，纳米膨润土基，烟酸，循环伏安法

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UNESA Journal of Chemistry

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24 weeks