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Analisis Pengaruh Konsentrasi Elektrolit NaCl terhadap Karakteristik Karbon Aktif dari Kulit Buah Kakao Vikra Yudha Yolanda Afza; Mulda Muldarisnur; Yuli Yetri
Jurnal Fisika Unand Vol 10, No 4 (2021)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.10.4.486-492.2021

Telah dilakukan sintesis karbon aktif dari kulit kakao dengan menggunakan aktivator KOH 0,3 M dengan variasi elektrolit NaCl 1 M, 2 M dan 3 M yang akan dimanfaatkan sebagai superkapasitor. Karakterisasi hasil dilakukan dengan Scanning Electronic Microscope (SEM) untuk melihat struktur pori, X-Ray Diffraction (XRD) untuk mengetahui kristal karbon, serta uji siklik voltammetry (CV) dan LCR-Meter untuk mengetahui nilai kapasitansi dan konduktivitas yang dihasilkan. Hasil analisa XRD didapatkan struktur atom yang berbentuk amorf yang tidak dipengaruhi oleh konsentrasi elektrolit NaCl yang diberikan. Analisa SEM membuktikan bahwa konsentrasi elektrolit NaCl mempengaruhi struktur pori. Elektrolit NaCl 3 M memiliki struktur pori yang lebih halus dan merata. Nilai kapasitansi spesifik menggunakan CV didapatkan nilai kapasitansi spesifik tertinggi yaitu 42,524 µF/g pada konsentrasi NaCl 3 M dan terendah pada konsentrasi NaCl 1 M 3 µF/g. Hasil yang didapatkan menggunakan alat LCR-Meter untuk mengukur konduktivitas adalah 1,83 S/m pada konsentrasi NaCl 3 M dan frekuensi 1000 Hz serta yang terendah pada konsentrasi elektrolit NaCl 1 M pada frekuensi 100 Hz 0.18 S/m. Hal ini membuktikan bahwa konsentrasi elektrolit yang diberikan dapat mempengaruhi dan meningkatkan nilai kapasitansi dan konduktivitas yang dihasilkan sel superkapasitor.

Pembuatan Cetakan Pasir Dan Proses Pemesinan Untuk Komponen Blok Pompa Pada Mesin Pompa Air Merk Matrix Model Mtx-22c Firdaus Firdaus; Rakiman Rakiman; Nota Effiandi; Yuli Yetri
Jurnal Teknik Mesin Vol 11 No 2 (2018): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Reverse Engineering (RE) is a process in manufacturing that aims to reproduce or recreate existing models, either components, sub-components, or products without using existing design documents or working drawings. Through this reverse engineering idea, the process of making the Pump Block component is started with making part and mold design, making sand casting, then finished with machining processes. The machining process that is carried out is the turning process, the milling process, and the drilling process which is assisted by using jigs and fixture to make it easier on finishing the Pump Block parts in the machining process. By using the processes, so it is produced the similar pump block that is resemble with desired original object.

EFFISIENSI INHIBISI INHIBITOR EKSTRAK DAUN TEH (Camelia sinensis) TERHADAP BAJA St-37 DALAM MEDIUM ASAM DAN GARAM Yetri, Yuli; Sari, Desi Mita; Handani, Sri
Jurnal Katalisator Vol 1, No 1 (2016): KATALISATOR
Publisher : LLDIKTI Wilayah X

Telah dilakukan penelitian untuk mengendalikan laju korosi baja St-37 dalam medium asam klorida dan natrium klorida menggunakan inhibitor ekstrak daun teh (Camelia sinensis). Metode weight loss dan metode potensiodinamik untuk menentukan laju korosi, dalam medium HCl 3 % dan NaCl 3 %, dengan konsentrasi inhibitor yang ditambahkan bervariasi mulai dari 1 % hingga 10 % dengan perendaman selama empat hari. Hasil penelitian menunjukan bahwa laju korosi berkurang dengan meningkatnya konsentrasi inhibitor yang ditambahkan, Peningkatan konsentrasi inhibitor diikuti juga dengan meningkatnya nilai effisiensin inhibisinya. Nilai efisiensi terbesar 86,3 % dengan penambahan konsentrasi inhibitor 10 % untuk medium korosif HCl dan dengan konsentrasi yang sama untuk NaCl mencapai 92,0%. Â Analisis morfologi permukaan dengan foto optik memperlihatkan permukaan baja dengan penambahan ekstrak daun teh mengalami korosi Â lebih sedikit dibandingkan dengan tanpa inibitor. Hal ini menunjukan bahwa inhibitor ekstrak daun teh sangat efisien untuk mengendalikan laju korosi dalam medium korosif HCl dan NaCl.Â A research Â to control corrosion rate of St-37 steel in acid chloride and sodium chloride medium using tea leaf (Camellia sinensis) extract inhibitor has been done. The method used is potentiodynamic to see the value of the corrosion current and weight loss method for corrosion rate.. Corrosive medium used were HCl 3% and NaCl 3%. The concentration of the extract used range from 1%-10% and the immersion time is four days. The results showed that the corrosion rate was greatest in the corrosive medium without addition of inhibitors, whereas the corrosion rate decreases with the addition of inhibitors, it is also evident from the results of the Tafel plot shows Icor impairment. The greater the concentration of inhibitor that is used the lower the corrosion rate. Greatest efficiency values both for medium corrosive obtained at inhibitor concentrations of 10%, 86,3% in HCl and 92% in NaCl. This shows that tea leaves extract inhibitor is very efficient in controlling the rate of corrosion in HCl and NaCl medium. From the optical photographÂ analysed on the surface morphology of St-37 steel showed that the addition of tea leaf extract suffered less corrosion.

Isolasi Dan Karakterisasi Bentonit Alam Menjadi Nanopartikel Monmorillonit Zaimahwati, Zaimahwati; Yuniati, Yuniati; Jalal, Ramzi; Zhafiri, Syahman; Yetri, Yuli
Jurnal Katalisator Vol 3, No 1 (2018): KATALISATOR
Publisher : LLDIKTI Wilayah X

Pada penelitian ini telah dilakukan isolasi dan karakterisasi bentonit alam menjadi nanopartikel montmorillonit. Bentonit alam yang digunakan diambil dari desa Blangdalam, Kecamatan Nisam Kabupaten Aceh Utara.Â Proses isolasi meliputi proses pelarutan dengan aquades, ultrasonic dan proses sedimentasi. Untuk mengetahui karakterisasi montmorillonit dilakukan uji FT-IR, X-RD dan uji morfologi permukaan dengan Scanning Electron Microscopy (SEM). Partikel size analyzer untuk menganalisis dan menentukan ukuran nanopartikel dari isolasi bentonit alam. Dari hasil penelitian didapat ukuran nanopartikel montmorillonit hasil isolasi dari bentonit alam diperoleh berdiameter rata-rata 82,15 nm.In this research we have isolated and characterized natural bentonite into montmorillonite nanoparticles. Natural bentonite used was taken from Blangdalam village, Nisam sub-district, North Aceh district. The isolation process includes dissolving process with aquades, ultrasonic and sedimentation processes. Â The characterization of montmorillonite, FT-IR, X-RD and surface morphology test by Scanning Electron Microscopy (SEM). Particle size analyzer to analyze and determine the size of nanoparticles from natural bentonite insulation. From the research results obtained the size of montmorillonite nanoparticles isolated from natural bentonite obtained an average diameter of 82.15 nm.

Produksi Pupuk Kompos Dari Sampah Rumah Tangga Hidayati, Rahmi; Nur, Ichlas; Yetri, Yuli
Jurnal Katalisator Vol 3, No 2 (2018): KATALISATOR
Publisher : LLDIKTI Wilayah X

Dengan melihat kondisi yang ada di Mentawai maka terjadilah kesepakatan bersama antara mitra bank sampah Siput Bisa dan bank sampah Polak Sikerey dengan tim Pengabdian Masyarakat Politeknik Negeri Padang untuk mengolah sampah rumah tangga menjadi pupuk kompos. Kesepakatan ini dilakukan untuk pembuatan pupuk organik dengan memanfaatkan sampahrumah tangga dan limbah pertanian yang melimpah jumlahnya. Program ini didahului dengan penyuluhan yang melibatkan unsur terkait yaitu: pengurus dan seluruh anggota kelompok PKK di desa Sipora Jaya kecamatan Sipora Utara kepulauan Mentawai serta dibantu oleh Petugas Penyuluh Lapangan (PPL) yang bertugas di wilayah tersebut. Penyuluhan ini diberikan dalam bentuk ceramah dan diskusi mengenai berbagai aspek teknologi pembuatan pupuk organik. Demonstrasi pembuatannya dilakukan setelah diskusi dan penyuluhan kelompok dilaksanakan. Pembuatan pupuk organik dilakukan secara intensif dengan menggunakan sampah yang sudah dikumpul oleh bank Sampah Siput Bisa dan Polak Sikerey serta sisa limbah pertanian oleh kelompok tani. Sampah rumah tangga tersebut dicincang dan dicampur dengan digester EM4, kemudian ditumpuk dan dibiarkan 3 minggu dan setiap minggu dibalik.. Hasil kegiatan ini memberikan beberapa manfaat terutama dari segi ekonomis dan pengembangan iptek, diantaranya adalah lingkungan menjadi bersih dan mengurangi bau, lalat dan penyebaran mikroorganisme patogen atau penyebab penyakit pada manusia dan ternak. Dengan pengelolaan sampah menjadi pupuk organik akan mendapatkan hasil tambahan yang lebih besar, dan dengan bisanya masyarakat membuat pupuk organik/pupuk kandang/kompos maka akan mengurangi ketergantungan penggunaan pupuk anorganik.

RANCANG BANGUN MESIN PULPER KOPI MENGGUNAKAN PENGGERAK MOTOR LISTRIK Tri Ego Wiranata; Ruzita Sumiati; Rakiman Rakiman; Yuli Yetri
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 10, No 1 (2021): Maret
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v10i1.26-32

Design and manufacture of coffee pulper machines have been carried out with the aim of completing the needs of the coffee farmer groups when harvesting in the Kayu Aro area, Kerinci. The steps in designing and manufacturing a coffee pulper begins with a literature study, design and calculation, the process of making the tool and ends with testing the tool. Engineering drawing design is done by modeling in SolidWorks software. Coffee peeler machine with a capacity of 4 kg/min, with a machine size of 730 mm x 320 mm x 1040 mm, using an electric motor 1 HP 1420 rpm, with a frame using an elbow profile 40 mm x 40 mm x 3 mm. The transmission system uses an electric motor with an initial rotation of 1420 rpm to 364.6 rpm. In the 2 pulley component D = 74.6 mm and 290.5 mm, V-belt type B No.52, 1 solid shaft D = 25 mm. Initial test results using 2–5 kg of wet coffee beans take 30.07–77.20 seconds, and the skin has separated from the beans cleanly. These results show that the engine capacity is 235.62 kg/h, so that the desired target is met with relatively low operating costs. The existence of this tool will be able to help the process of separating the skin and coffee beans, so that the quality of coffee production will increase. Keywords: coffee, coffee machine, design and construction, farmer groups

EFFISIENSI INHIBISI KOROSI BAJA LUNAK DALAM MEDIA ASAM DENGAN INHIBITOR EKSTRAK KULIT BUAH KAKAO (THEOBROMA CACAO) Gunawarman, G; Jamarun, Novesar; Emriadi, E; Yetri, Yuli
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol 7, No 2 (2016)
Publisher : Kementerian Perindustrian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2016.v7.no2.p67-80

Efek inhibisi korosi dan sifat-sifat adsorpsi oleh ekstrak kulit buah kakao (Theobroma cacao) pada baja lunak (mild steel) dalam larutan asam 1,5M HCl telah dipelajari menggunakan teknik konvensional metode berat hilang pada variasi waktu, konsentrasi dan suhu. Parameter-parameter termodinamika seperti energi aktivasi, entalpi, entropi dan perubahan energi bebas dihitung. Polarisasi elektrokimia telah dievaluasi untuk memastikan jenis inhibitor. Spektra infrared dan GCMS dilakukan untuk mengetahui senyawa ekstrak yang berperan dalam proses inhibisi. Morfologi permukaan sampel diamati dengan menggunakan scanning electro microscopy dengan energy dispersive X-ray spectroscopy (SEM-EDX) . Keseluruhan hasil penelitian menunjukkan bahwa ekstrak polar kulit buah coklat dapat digunakan sebagai inhibitor korosi yang efektif pada baja karbon di lingkungan 1,5M HCl dengan pencapaian efisiensi inhibisi terkorosi sebesar 96.26% (weight loss) dan 92.08% (Tafel) pada konsentrasi ekstrak 2,5% selama768 jam. Mekanisme inhibisi adalah adsorpsi chemiadsorpsi berdasar tingginya nilai entalpi dan energi bebas.Effisiensi Inhibisi diketahui meningkat dengan peningkatan konsentrasi dari ekstrak serta menurun dengan peningkatan suhu. Kurva polarisasi menunjukkan inhibitor ini berperilaku sebagai inhibitor campuran dengan dominan pada inhibisi katodik. Ekstrak diadsorpsi oleh permukaan mild steel mengikuti model adsorpsi isotherm Langmuir. Kondisi permukaan mild steel menunjukan terjadinya adsorpsi di permukaan membentuk lapisan tipis di permukaan logam. Penambahan ekstrak kulit buah kakao ke dalam larutan HCl sangat efektif untuk mengurangi serangan korosi di permukaan mild steel. Kata kunci: Korosi, Inhibitor, Theobroma cacao, Mild steel, Potensiodinamik Corrosion Inhibition Efficiency Mild Steel in Acid Media with Inhibitor Peels Extract of Cacao (Theobroma cacao)ABSTRACT Inhibition and adsorption properties of Theobroma cacao peel polar extract addition on corrosion inhibition efficiency of 0.3%C mild steel in hydrochloric acid solution for various exposuring time, extract concentration and working temperature were investigated using weight loss test method. Electrochemical polarization test was also conducted to confirm the effectiveness of inhibition. Infrared spectrum of the samples was also evaluated to reveal compounds of the extract which controll the inhibition process. Morphology and local composition of sample surfaces were respectively examined by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). Thermodynamic parameters such as energy activation, enthalpy, entropy and change in the free energy were then determined using related data. The results show that the inhibition efficiency increases significantly up to 96.3% (by weight loss method) and 92.08% (Tafel) with the increase of TCPE content. The optimum efficiency is obtained at extract concentration of 2,5% for exposuring time of 768h. However, the efficiency decreases slightly with increasing working temperature in the range of 303K-323K. The polarization curve shows the inhibitor behaves as a mixed inhibitor with the dominant cathodic inhibition. The adsorption model is found to obey Langmuir adsorption isotherm. Surface condition is improved due to the adsorption and then formation of thin layer film protection in the surface of the steel. The addition of extract of cacao peels into HCl is effective to minimize corrosion attack on the mild steel. Key words: Corrosion, inhibitor, Theobroma cacao peel, Mild steel, Potensiodinamic

EFFISIENSI INHIBISI KOROSI BAJA LUNAK DALAM MEDIA ASAM DENGAN INHIBITOR EKSTRAK KULIT BUAH KAKAO (THEOBROMA CACAO) Yetri, Yuli; Emriadi, E; Jamarun, Novesar; Gunawarman, G
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol 7, No 2 (2016)
Publisher : Kementerian Perindustrian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2016.v7.no2.p67-80

Efek inhibisi korosi dan sifat-sifat adsorpsi oleh ekstrak kulit buah kakao (Theobroma cacao) pada baja lunak (mild steel) dalam larutan asam 1,5M HCl telah dipelajari menggunakan teknik konvensional metode berat hilang pada variasi waktu, konsentrasi dan suhu. Parameter-parameter termodinamika seperti energi aktivasi, entalpi, entropi dan perubahan energi bebas dihitung. Polarisasi elektrokimia telah dievaluasi untuk memastikan jenis inhibitor. Spektra infrared dan GCMS dilakukan untuk mengetahui senyawa ekstrak yang berperan dalam proses inhibisi. Morfologi permukaan sampel diamati dengan menggunakan scanning electro microscopy dengan energy dispersive X-ray spectroscopy (SEM-EDX) . Keseluruhan hasil penelitian menunjukkan bahwa ekstrak polar kulit buah coklat dapat digunakan sebagai inhibitor korosi yang efektif pada baja karbon di lingkungan 1,5M HCl dengan pencapaian efisiensi inhibisi terkorosi sebesar 96.26% (weight loss) dan 92.08% (Tafel) pada konsentrasi ekstrak 2,5% selama768 jam. Mekanisme inhibisi adalah adsorpsi chemiadsorpsi berdasar tingginya nilai entalpi dan energi bebas.Effisiensi Inhibisi diketahui meningkat dengan peningkatan konsentrasi dari ekstrak serta menurun dengan peningkatan suhu. Kurva polarisasi menunjukkan inhibitor ini berperilaku sebagai inhibitor campuran dengan dominan pada inhibisi katodik. Ekstrak diadsorpsi oleh permukaan mild steel mengikuti model adsorpsi isotherm Langmuir. Kondisi permukaan mild steel menunjukan terjadinya adsorpsi di permukaan membentuk lapisan tipis di permukaan logam. Penambahan ekstrak kulit buah kakao ke dalam larutan HCl sangat efektif untuk mengurangi serangan korosi di permukaan mild steel. Kata kunci: Korosi, Inhibitor, Theobroma cacao, Mild steel, Potensiodinamik Corrosion Inhibition Efficiency Mild Steel in Acid Media with Inhibitor Peels Extract of Cacao (Theobroma cacao)ABSTRACT Inhibition and adsorption properties of Theobroma cacao peel polar extract addition on corrosion inhibition efficiency of 0.3%C mild steel in hydrochloric acid solution for various exposuring time, extract concentration and working temperature were investigated using weight loss test method. Electrochemical polarization test was also conducted to confirm the effectiveness of inhibition. Infrared spectrum of the samples was also evaluated to reveal compounds of the extract which controll the inhibition process. Morphology and local composition of sample surfaces were respectively examined by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). Thermodynamic parameters such as energy activation, enthalpy, entropy and change in the free energy were then determined using related data. The results show that the inhibition efficiency increases significantly up to 96.3% (by weight loss method) and 92.08% (Tafel) with the increase of TCPE content. The optimum efficiency is obtained at extract concentration of 2,5% for exposuring time of 768h. However, the efficiency decreases slightly with increasing working temperature in the range of 303K-323K. The polarization curve shows the inhibitor behaves as a mixed inhibitor with the dominant cathodic inhibition. The adsorption model is found to obey Langmuir adsorption isotherm. Surface condition is improved due to the adsorption and then formation of thin layer film protection in the surface of the steel. The addition of extract of cacao peels into HCl is effective to minimize corrosion attack on the mild steel. Key words: Corrosion, inhibitor, Theobroma cacao peel, Mild steel, Potensiodinamic

PENINGKATAN KEMAMPUAN PENGELASAN SMAW POSISI 2F PEMUDA KELURAHAN KOTO LUAR KECAMATAN PAUH PADANG Yuli Yetri; Zulhendri; Yuliarman; Yasmendra Rosa; Rino Sukma; Junaidi; Yusri
Bahasa Indonesia Vol 16 No 01 (2019): Sarwahita : Jurnal Pengabdian Kepada Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat

The community service program carried out by the Mechanical Engineering Department, Padang State Polytechnic lecturer is an activity in order to fulfill the Tridarma of Higher Education for the 2018 budget year. The activity was held in the form of SMAW 2F welding improvement training for the youth of Koto Luar, Pauh sub-district, Padang. In this area, there are many high school graduates who have not dared to enter the real workforce because they feel they do not have sufficient skills to join the field workforce. On the other hand, the Koto Luar village is currently developing very fast, because there has been assimilation between migrants and indigenous people. Along with increasing population, of course also followed by the addition of living facilities. To synergize the increase in progress with its human resource capabilities, various knowledge and skills are needed, one of which is the electric welding skills knowledge of SMAW 2F. Its welding training was attended by 21 Koto Luar youths for 4 days at the Mechanical Engineering department workshop. Expected abilities after training, Koto Luar youths are able to properly weld 2F methods according to welding standards, so that later participants are expected to enter the world of welding work. After debriefing the participants can take part in the welding training well, so that they get the SMAW 2F welding certificate signed by the director of the Padang State Polytechnic. The welding enhancement training activity of SMAW 2F received positive support from the chairman of the Community Empowerment Agency (BPM) and village leaders, because this activity had long been wanted by the community. The Koto Luar community hopes that the training to improve SMAW 2F's welding ability for youth in Pauh Padang sub-district can be carried out continuously, because many young people are interested in SMAW's welding knowledge, the goal is to be able to open entrepreneurs and fill jobs around Lambung Bukit, Koto Luar , and Limau Manis Padang.

Efisiensi Inhibisi Korosi Baja Lunak dalam Media Asam dengan Inhibitor Ekstrak Kulit Buah Kakao (Theobroma cacao) Yetri, Yuli; Emriadi, E; Jamarun, Novesar; Gunawarman, G
Jurnal Riset Teknologi Pencegahan Pencemaran Industri Vol. 7 No. 2 (2016)
Publisher : Balai Besar Standardisasi dan Pelayanan Jasa Pencegahan Pencemaran Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21771/jrtppi.2016.v7.no2.p67-80

Inhibition and adsorption properties of Theobroma cacao peel polar extract addition on corrosion inhibition efficiency of 0.3%C mild steel in hydrochloric acid solution for various exposuring time, extract concentration and working temperature were investigated using weight loss test method. Electrochemical polarization test was also conducted to confirm the effectiveness of inhibition. Infrared spectrum of the samples was also evaluated to reveal compounds of the extract which controll the inhibition process. Morphology and local composition of sample surfaces were respectively examined by scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). Thermodynamic parameters such as energy activation, enthalpy, entropy and change in the free energy were then determined using related data. The results show that the inhibition efficiency increases significantly up to 96.3% (by weight loss method) and 92.08% (Tafel) with the increase of TCPE content. The optimum efficiency is obtained at extract concentration of 2,5% for exposuring time of 768h. However, the efficiency decreases slightly with increasing working temperature in the range of 303K-323K. The polarization curve shows the inhibitor behaves as a mixed inhibitor with the dominant cathodic inhibition. The adsorption model is found to obey Langmuir adsorption isotherm. Surface condition is improved due to the adsorption and then formation of thin layer film protection in the surface of the steel. The addition of extract of cacao peels into HCl is effective to minimize corrosion attack on the mild steel.

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