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THE PROFILE OF INQUIRY MODEL ON STUDENT ACTIVITY AND LEARNING OUTCOMES ON COLLIGATIVE PROPERTIES Said ali akbar
Lantanida Journal Vol 7, No 1 (2019)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (241.723 KB) | DOI: 10.22373/lj.v7i1.4521

Abstract

Penelitian ini bertujuan untuk mengetahui profil aktivitas guru, aktivitas siswa, afektif siswa, psikomotor siswa, dan hasil belajar siswa. Metode penelitian ini menggunakan desain penelitian tindakan kelas dengan dua siklus. Setiap siklus terdiri dari tahap perencanaan, tindakan, observasi dan evaluasi, serta analisis dan refleksi. Pada aktivitas guru, perbedaan nilai terlihat pada kelas C dengan persentase 76,28% (sangat baik) di siklus pertama menjadi 92,55% (luar biasa) di siklus kedua. Peningkatan juga terjadi pada aspek afektif, kognitif, dan psikomotor siswa. Skor profil dari hasil belajar pada ketiga kelas mencapai skor ketuntasan pada siklus 2, meskipun pada siklus 1 kelas A telah mencapai ketuntasan dengan kelulusan mencapai 85,71%. Selanjutnya, model pembelajaran inkuiri terbimbing ini dapat meningkatkan afektif, kognitif, dan psikomotor siswa. Oleh sebab itu, hasil belajar siswa pada materi sifat koligatif larutan telah mencapai indikator keberhasilan.
Green Synthesis of Reduced Graphene Oxide Using Lime Juice Reductor From Citrus aurantifolia Said Ali Akbar; Fitriya Nanda; Nispi Mawaddah; Mima Yuriati
Elkawnie: Journal of Islamic Science and Technology Vol 5, No 2 (2019)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v5i2.4948

Abstract

In this study, the reduced graphene oxide (rGO) synthesized by using lime juice as an environmentally friendly reducing agent and inexpensive cost. The synthesis was carried out by oxidizing graphite with the Hummer method to form graphene oxide (GO) was formed, then the GO was reduced by using lime as the natural reducing agent. X-ray analysis shown a vital diffraction pattern for graphite at 2θ = 26.4°, for graphene oxide appears around 2θ = 10° and 43o, and rGO at 2θ = 23.8°. Furthermore, the infrared spectrum of the three samples showed the peak of the hydroxyl group at 3412 cm-1, which appeared on graphene oxide, but was not observed in rGO. The vibrational mode of carbonyl (C=O) at 1723 cm-1 was also observed with high intensity on graphene oxide. This information showed that GO has a large number of oxygen-containing groups. Then, in the dissolution test shown that the GO was more soluble in polar solvents such as water than ethanol.
Evaluation of Antioxidant Activity On Plum Fruit (Prunus domestica L.) Skin Extract Applied For Natural Acid-Base Indicator Said Ali Akbar
Elkawnie: Journal of Islamic Science and Technology Vol 5, No 1 (2019)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v5i1.4516

Abstract

Plum peel was extracted through the maceration method with 100 mL ethanol. This process obtained 5% (50 µg/µL) skin extract. The UV-Vis spectrum of the extract displayed the major absorption peak at λmax = 526 nm in acid media, this assigned by the electronic transition from flavylium which as characteristic of anthocyanin compounds. The of anthocyanins stability on temperature effect showed the absorbance decreases with the heating time, while the level of pigment color loss, or the percentage of color loss, gradually increases. The pigment was maintained at 100oC for 100 min with the loss rate reaches 58.5%. Therefore, The loss of anthocyanin color in the plum peel is relatively stable at lower temperatures. Then, The plum peels extract shown the red color at pH 1-3, almost colorless at pH 4-7, and violet color at pH 12. Finally, plum peels extract was potentially used as the acid-base indicator.
The UV-Vis Study On Anthocyanin Pigments Activities Extracted From Gayo Arabika Coffee Husks Hasby Hasby; Nurhafidhah Nurhafidhah; Said Ali Akbar
Elkawnie: Journal of Islamic Science and Technology Vol 5, No 2 (2019)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v5i2.5232

Abstract

The anthocyanin activity of Gayo Arabica coffee husk in variations in acid solution, temperature, and pH has been assessed through UV-Vis studies. It is important to optimize these factors to increase the long-term stability of anthocyanins for use in various fields. Gayo Arabica coffee husks was extracted through maceration method with methanol. This process obtained a coffee husks extract of 1.176 mg/μL. The UV-Vis spectrum of the extract displayed the major absorption peak at λmax= 529 nm in hydrochloric acid (HCl), this assigned by the electronic transition from flavylium as the particular characteristic of anthocyanin compounds. The anthocyanin from the extract was stable at temperatures of 35oC and 50oC, to have a major absorption peak at λmax= 529 nm. Therefore, it could probably be said that the lower the temperature, the higher the absorbance value of anthocyanin. Then, husks extract was getting red at pH 1 and 3; almost colorless at pH 5, 8 and 10; and yellow at pH 12. The more acidic conditions causes more anthocyanin pigments to be observed in the form of flavylium or oxonium cations color. Finally, Gayo Arabica coffee husks extract can absorb both ultraviolet (UV) and visible light (visible).
Sensor Gas Amonia Berbasis Polimer Konduktif Polianilina: Sebuah Review Said Ali Akbar
JURNAL QUIMICA Vol 3 No 2 (2021)
Publisher : Program Studi Kimia, Fakultas Teknik, Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/jq.v3i2.4678

Abstract

Artikel review ini memberikan informasi tentang aplikasi polianilina (PANI) dan kompositnya sebagai sensor gas berbahaya khususnya amonia (NH3). Kajian yang dibahas pada artikel ini meliputi sifat gas NH3, material komposit, kinerja sensor, serta limit deteksi. Tinjauan sensor gas amonia berbasis polimer konduktif polianilina secara menyeluruh diambil dari referensi sepuluh tahun terakhir. Sebagai contoh, komposit polianilina dengan turunan karbon seperti reduced Graphene Oxide (rGO) dan Carbon Nanotube menunjukkan limit deteksi hingga 46 ppb dengan waktu pemulihan hanya 75 detik. Selain itu, komposit PANI dengan logam seperti Ag, Sr dan sebagainya, menunjukkan limit deteksi yang lebih besar yaitu 1 ppm, namun terdapat keunggulan dimana waktu pemulihan hanya 4 deti. Oleh sebab itu, polimer konduktif polianilina menjadi material yang sangat menjanjikan untuk mendeteksi keberadaan gas NH3. Terakhir, mekanisme penginderaan gas amonia terhadap material PANI juga dibahas pada tulisan ini. Referensi: [1] M. Insausti, R. Timmis, R. Kinnersley, and M. C. Rufino, “Advances in sensing ammonia from agricultural sources,” Science of the Total Environment, vol. 706. 2020. doi: 10.1016/j.scitotenv.2019.135124. [2] H. Shen et al., “Intense Warming Will Significantly Increase Cropland Ammonia Volatilization Threatening Food Security and Ecosystem Health,” One Earth, vol. 3, no. 1, 2020, doi: 10.1016/j.oneear.2020.06.015. [3] W. Wu, B. Wei, G. Li, L. Chen, J. Wang, and J. Ma, “Study on ammonia gas high temperature corrosion coupled erosion wear characteristics of circulating fluidized bed boiler,” Engineering Failure Analysis, vol. 132, p. 105896, 2022, doi: https://doi.org/10.1016/j.engfailanal.2021.105896. [4] X. Huang et al., “Reduced graphene oxide–polyaniline hybrid: Preparation, characterization and its applications for ammonia gas sensing,” Journal of Materials Chemistry, vol. 22, no. 42, pp. 22488–22495, 2012, doi: 10.1039/C2JM34340A. [5] T. Jiang, P. Wan, Z. Ren, and S. Yan, “Anisotropic Polyaniline/SWCNT Composite Films Prepared by in Situ Electropolymerization on Highly Oriented Polyethylene for High-Efficiency Ammonia Sensor,” ACS Applied Materials & Interfaces, vol. 11, no. 41, pp. 38169–38176, Oct. 2019, doi: 10.1021/acsami.9b13336. [6] H. Bai and G. Shi, “Gas sensors based on conducting polymers,” Sensors, vol. 7, no. 3. 2007. doi: 10.3390/s7030267. [7] D. Kwak, Y. Lei, and R. Maric, “Ammonia gas sensors: A comprehensive review,” Talanta, vol. 204. 2019. doi: 10.1016/j.talanta.2019.06.034. [8] M. Eising, C. E. Cava, R. V. Salvatierra, A. J. G. Zarbin, and L. S. Roman, “Doping effect on self-assembled films of polyaniline and carbon nanotube applied as ammonia gas sensor,” Sensors and Actuators, B: Chemical, vol. 245, pp. 25–33, 2017, doi: 10.1016/j.snb.2017.01.132. [9] M. P. Diana, W. S. Roekmijati, and W. U. Suyud, “Why it is often underestimated: Historical Study of Ammonia Gas Exposure Impacts towards Human Health,” in E3S Web of Conferences, 2018, vol. 73. doi: 10.1051/e3sconf/20187306003. [10] R. T. Xu et al., “Half-Century Ammonia Emissions From Agricultural Systems in Southern Asia: Magnitude, Spatiotemporal Patterns, and Implications for Human Health,” GeoHealth, vol. 2, no. 1, 2018, doi: 10.1002/2017GH000098. [11] S. A. Akbar, A. Mardhiah, N. Saidi, and D. Lelifajri, “The effect of graphite composition on polyaniline film performance for formalin gas sensor,” Bulletin of the Chemical Society of Ethiopia, vol. 34, no. 3, 2021, doi: 10.4314/bcse.v34i3.14. [12] X. Wang, L. Gong, D. Zhang, X. Fan, Y. Jin, and L. Guo, “Room temperature ammonia gas sensor based on polyaniline/copper ferrite binary nanocomposites,” Sensors and Actuators B: Chemical, vol. 322, p. 128615, 2020, doi: https://doi.org/10.1016/j.snb.2020.128615. [13] L. Wang et al., “Enhanced Sensitivity and Stability of Room-Temperature NH3 Sensors Using Core–Shell CeO2 Nanoparticles@Cross-linked PANI with p–n Heterojunctions,” ACS Applied Materials &Interfaces, vol. 6, no. 16, pp. 14131–14140, Aug. 2014, doi: 10.1021/am503286h. [14] Y. Guo et al., “Hierarchical graphene–polyaniline nanocomposite films for high-performance flexible electronic gas sensors,” Nanoscale, vol. 8, no. 23, pp. 12073–12080, 2016, doi: 10.1039/C6NR02540D. [15] M. Eising, C. E. Cava, R. V. Salvatierra, A. J. G. Zarbin, and L. S. Roman, “Doping effect on self-assembled films of polyaniline and carbon nanotube applied as ammonia gas sensor,” Sensors and Actuators B: Chemical, vol. 245, pp. 25–33, 2017, doi: https://doi.org/10.1016/j.snb.2017.01.132. [16] S. Bai et al., “Transparent conducting films of hierarchically nanostructured polyaniline networks on flexible substrates for high-performance gas sensors,” Small, vol. 11, no. 3, 2015, doi: 10.1002/smll.201401865. [17] Z. Wu et al., “Enhanced sensitivity of ammonia sensor using graphene/polyaniline nanocomposite,” Sensors and Actuators, B: Chemical, vol. 178, 2013, doi: 10.1016/j.snb.2013.01.014. [18] N. R. Tanguy, B. Wiltshire, M. Arjmand, M. H. Zarifi, and N. Yan, “Highly Sensitive and Contactless Ammonia Detection Based on Nanocomposites of Phosphate-Functionalized Reduced Graphene Oxide/Polyaniline Immobilized on Microstrip Resonators,” ACS Applied Materials and Interfaces, vol. 12, no. 8, 2020, doi: 10.1021/acsami.9b21063. [19] D. Maity and R. T. R. Kumar, “Polyaniline Anchored MWCNTs on Fabric for High Performance Wearable Ammonia Sensor,” ACS Sensors, vol. 3, no. 9, 2018, doi: 10.1021/acssensors.8b00589. [20] J. Ma et al., “Multi-walled carbon nanotubes/polyaniline on the ethylenediamine modified polyethylene terephthalate fibers for a flexible room temperature ammonia gas sensor with high responses,” Sensors and Actuators, B: Chemical, vol. 334, May 2021, doi: 10.1016/j.snb.2021.129677. [21] A. Javadian-Saraf, E. Hosseini, B. D. Wiltshire, M. H. Zarifi, and M. Arjmand, “Graphene oxide/polyaniline-based microwave split-ring resonator: A versatile platform towards ammonia sensing,” Journal of Hazardous Materials, vol. 418, Sep. 2021, doi: 10.1016/j.jhazmat.2021.126283. [22] A. Liu et al., “The gas sensor utilizing polyaniline/ MoS2 nanosheets/ SnO2 nanotubes for the room temperature detection of ammonia,” Sensors and Actuators, B: Chemical, vol. 332, Apr. 2021, doi: 10.1016/j.snb.2021.129444. [23] Q. Feng, H. Zhang, Y. Shi, X. Yu, and G. Lan, “Preparation and gas sensing properties of PANI/SnO2 hybrid material,” Polymers, vol. 13, no. 9, May 2021, doi: 10.3390/polym13091360. [24] S. Benhouhou, A. Mekki, M. Ayat, and N. Gabouze, “Facile Preparation of PANI-Sr Composite Flexible Thin Film for Ammonia Sensing at Very Low Concentration,” Macromolecular Research, vol. 29, no. 4, pp. 267–279, Apr. 2021, doi: 10.1007/s13233-021-9034-3. [25] X. Wang et al., “In situ polymerized polyaniline/MXene (V2C) as building blocks of supercapacitor and ammonia sensor self-powered by electromagnetic-triboelectric hybrid generator,” Nano Energy, vol. 88, Oct. 2021, doi: 10.1016/j.nanoen.2021.106242. [26] J. Chang et al., “Polyaniline-Reduced Graphene Oxide Nanosheets for Room Temperature NH3Detection,” ACS Applied Nano Materials, vol. 4, no. 5, pp. 5263–5272, May 2021, doi: 10.1021/acsanm.1c00633. [27] S. Matindoust, A. Farzi, M. Baghaei Nejad, M. H. Shahrokh Abadi, Z. Zou, and L. R. Zheng, “Ammonia gas sensor based on flexible polyaniline films for rapid detection of spoilage in protein-rich foods,” Journal of Materials Science: Materials in Electronics, vol. 28, no. 11, 2017, doi: 10.1007/s10854-017-6471-z. [28] J. Cai, C. Zhang, A. Khan, C. Liang, and W. di Li, “Highly transparent and flexible polyaniline mesh sensor for chemiresistive sensing of ammonia gas,” RSC Advances, vol. 8, no. 10, pp. 5312–5320, 2018, doi: 10.1039/c7ra13516e. [29] T. Syrový et al., “Gravure-printed ammonia sensor based on organic polyaniline colloids,” Sensors and Actuators, B: Chemical, vol. 225, pp. 510–516, Mar. 2016, doi: 10.1016/j.snb.2015.11.062.
Degradasi Carmoisine Oleh Reagen Fenton: Optimalisasi Parameter Degradasi Said Ali Akbar
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 4 No 2 (2021): Katalis: Jurnal Penelitian Kimia dan Pendidikan Kimia
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v4i2.4414

Abstract

Carmoisine adalah zat warna azo sintetis yang menghasilkan warna merah untuk makanan. Kehadiran gugus sulfonat dalam Carmoisine membuatnya polar dan larut dalam air. Zat warna ini dapat menyebabkan asma dan alergi pada banyak orang. Oleh karena itu, perlu adanya metoda yang tepat untuk menghilangkan Carmoisine dari limbah yang mudah dioperasikan dan berbiaya rendah. Penelitian ini dirancang untuk menyelidiki degradasi Carmoisine dari larutan dengan proses oksidasi menggunakan reagen Fenton. Proses degradasi zat warna dipantau menggunakan spektrofotometer UV-Vis. Efek dari parameter operasi yang mempengaruhi efisiensi degradasi seperti H2O2, Fe2+, konsentrasi zat warna, serta pH dipelajari dan dioptimalkan. Kondisi optimal dicapai pada saat Fe2+ 0,1 mM, H2O2 0,5 mM, konsentrasi zat warna awal adalah 10 mg/L, serta pH = 3,5. Semua percobaan ini dilakukan pada suhu ruangan yaitu 27 oC. Dalam kondisi optimal, efisiensi degradasi zat warna mencapai 93,25% dalam larutan yang dicapai setelah 60 menit reaksi. Oleh sebab itu, reagen Fenton adalah metode yang baik untuk menghilangkan zat warna Carmoisine dari larutan.
SINTESIS DAN KARAKTERISASI POLIANILINA (PANI) DENGAN VARIASI DOPING ASAM KUAT MENGGUNAKAN METODA ELEKTRODEPOSISI Said Ali Akbar; Ainun Mardhiah; Nurdin Saidi; Lelifajri Lelifajri
Prosiding Seminar Nasional USM Vol 1, No 1 (2017): Prosiding Seminar Nasional USM
Publisher : Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (561.183 KB)

Abstract

Sebagai polimer konduktif, PANI banyak digunakan pada berbagai aplikasi. PANI Polianilina (PANI) telah banyak dikembangkan pada perangkat elektronik seperti sensor, kapasitor, baterai,organic light emiting diodes (OLED), dan organic photovoltaic cells (OPVC).Hal ini disebabkankarena PANI memiliki beberapa keunggulan seperti mudah difabrikasi, memiliki multi leveloksidasi, stabilitas yang baik, konduktivitas yang bervariasi, dan harga monomer yang murahdibandingkan dengan polimer konduktif yang lain. Pada penelitian ini PANI disintesismenggunakan metode elektodeposisi menggunakan 3 jenis doping Asam yaitu HCl, HBr, danHClO4. Ketiga asam menunjukkan hasil sintesis yang mirip, pada spektrum IR. Serapan pentingpada bilangan 1246 cm-1 yaitu Ulur (C–N+•) pada kisi polaron yang menunjukkan PANI beradapada bentuk garam.
KERJASAMA SISWA DALAM PEMBELAJARAN MELALUI MEDIA GAME EDUKASI (TTS KIMIA) Ainun Mardhiah; Said Ali Akbar
Prosiding Seminar Nasional USM Vol 1, No 1 (2017): Prosiding Seminar Nasional USM
Publisher : Universitas Serambi Mekkah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.038 KB)

Abstract

Penelitian ini bertujuan untuk melihat kerjasama siswa dalam proses belajar mengajar dengan menggunakan TTS Kimia. Kerja sama merupakan usaha terkoordinasi di antara anggota kelompok yang diarahkan untuk mencapai tujuan bersama melalui TTS yang berisikan materihidrokarbon. Sampel dalam penelitian ini adalah siswa kelas XI-IA MAN Negeri 16 Banda Acehsebanyak 22 siswa. Teknik pengumpulan data yang digunakan adalah menggunakan lembarobservasi yang bertujuan untuk melihat sikap kerjasama siswa dalam proses belajar mengajarmenggunakan media TTS, selanjutnya dianalisis menggunakan rumus unuk melihat nilaiperkembangan kerjakeras yang dihasilan. Hasil penelitian yang diperoleh adalah sikap kerjasamasiswa tegolong dalam kategori tinggi yang dibelajarkan dengan media TTS Kimia yaitu sebesar85,5. Dapat disimpulkan bahwa dengan menggunakan TTS Kimia dalam proses pembelajaranpada materi hirokarbon sangat berpengaruh terhadap sikap kerjasama siswa dalam tim.