23 research outputs found
PENGOLAHAN LIMBAH POLIPROPILEN MENJADI BAHAN BAKAR CAIR MELALUI METODE PIROLISIS
Get PDFPlastics become the biggest environmental problem when it accumulate in landfills because its non-biodegradable properties. To handle the problems, the plastics were processed to produce liquid fuels by means pyrolysis method which was in this case with and without a catalyst. In this work, polypropylene was used as a precursor and SiO2, zeolites, CaO, Fe as catalysts. FTIR spectrum of pyrolized polypropylene with and without catalysts both have shown C = C functional group at 1648 cm-1. GCMS analysis confirmed the availability of chain length of hydrocarbon between C7 -C27 which is mixture of kerosene and diesel fractions. Catalysts can lower the temperature and time reaction of pyrolysis process as they increase rendement (%) of product. Liquid fuels that produced from polypropylene pyrolysis without catalyst was 72.06%, and with catalysts were 79.59% (SiO2), 74.76%, (zeolite), 76.80% (CaO), and 76.83% (Fe).</jats:p
Integrated Project Based Learning (PjBL) with STEM and Field Study in Elemental Chemistry Learning
Get PDFThis research investigates the effectiveness of a project-based learning (PjBL) model integrated with Science, Technology, Engineering, and Mathematics (STEM) in enhancing students critical thinking and field study skills in Elemental Chemistry. The study aims to assess how this integrated approach influences student learning activities, including engagement with scientific literature, teamwork, cognitive skills enhancement, and the development of teaching materials for independent discovery. A mixed-methods approach was used, combining statistical analysis of quantitative data with qualitative insights from observation sheets, interviews, and student worksheets. The curriculum included soft skill training in sampling teak sawdust (Tectona grandis) and synthesizing oxalic acid, Ca, Ba, and Mg-oxalic compounds in the lab. Results showed significant improvement in student grades in the Elemental Chemistry course, with average scores in the good category ranging from 71.05% to 79.55%, indicating the PjBL model is effective. Furthermore, the development of an Elemental Chemistry learning kit specifically designed for the PjBL approach effectively enhanced student thinking skills, as evidenced by their achievements in STEM-related tasks, highlighting the potential of integrated learning method in improving educational outcomes in higher education chemistry courses
Adsorpsi Methylene Blue pada Nanopartikel Magnetit tersalut Asam Humat: Kajian Isoterm dan Kinetika
Get PDFNanopartikel magnetit merupakan suatu material dengan sifat magnet yang stabil dan memiliki luas permukaan tinggi. Penyalutan nanopartikel magnetit dengan asam humat (AH) dilaporkan dapat meningkatkan stabilitas, kapasitas adsorpsi, dan kemudahan pemisahan pasca adsorpsi. Penelitian ini bertujuan untuk melakukan sintesis Nanopartikel Magnetit tersalut Asam Humat (NpMAH) dengan metode ko-presipitasi dan menentukan parameter adsorpsinya sebagai adsorben Methylene Blue (MB) dengan metode batch. Keberhasilan sintesis ditunjukkan oleh karakterisasi NpMAH dengan FT-IR, XRD, SEM, dan VSM. Parameter isoterm adsorpsi mengindikasikan bahwa adsorpsi terjadi secara lapis tunggal dengan kapasitas adsorpsi sebesar 56,96 mg/g dan energi adsorpsi sebesar 26,31 kJ/mol pada pH optimum 6,0. Parameter kinetika menunjukkan bahwa adsorpsi mengikuti model kinetika Ho (pseudo orde kedua) dengan konstanta laju adsorpsi (kHo) sebesar 12688,71 g/molmenitdan perhitungan MB yang teradsorpsi pada kesetimbangan (qe) sebesar 2,96×10-5 mol/g. Perhitungan energi adsorpsi menggunakan model kinetika Santosa dan RBS berturut-turut 25,67 kJ/mol dan 41,25 kJ/mol
PENGGUNAAN PjBL TERINTEGRASI STEAM DAN LIFE SKILL MAHASISWA DALAM PEMBELAJARAN KIMIA ANORGANIK
Get PDFThe Use Of PjBL Integrated STEAM and Students Life Skills in Inorganic ChemistryLearning
ABSTRAK
Tujuan penelitian ini untuk menerapkan model pembelajaran PjBL (Project Based Learning) yang terintegrasi STEAM (Science, Technology, Engineering, Art, Mathematics) dan hubungannya dengan life skill Mahasiswa dalam pembelajaran Kimia Anorganik. Metode pengumpulan data dilakukan menggunakan pre-test dan post-test, project assessment pembuatan Batik serta presentasi Kelompok dari tugas Kelompok dalam LKM (Lembar Kerja Mahasiswa) pada Mata Kuliah Kimia Anorganik III. Tugas Kelompok yang berkaitan dengan Senyawa Koordinasi dan Isomer Senyawa Koordinasi yang dilustrasikan ke dalam Motif Batik Jambi. Art atau seni batik motif “Angso Duo†sebagai ilustrasi isomer levo dan dextro etilendiammintetraasetatokobaltat(III) dimana gugus etilen sebagai ilustrasi pada bagian ekor binatang Angsa. Engineering atau rekayasa dikembangkan melalui bahan pewarna Batik menggunakan bahan alami.
Hasil Uji korelasi diperoleh 0,57 nilai signifikasi diperoleh F hitung sebesar 0,006 yang berarti lebih kecil dari 0,05 sebagai F teori. Uji determinasi diperoleh R2 sebesar 0,374 atau l=0,37 % yang menunjukkan bahwa kesesuaian penggunaan model pembelajaran PjBL terintegrasi STEAM dengan life skill mahasiswa pada praktikum pembuatan Batik dengan menggunakan Teori Kimia Anorganik III tergolong kuat (37.4%) dan sisanya dipengaruhi oleh variabel luar (62,6 %).Â
Berdasarkan dari hasil penelitian bahwa diperoleh hasil yang baik, jika pembelajaran PjBL diintegrasikan dengan model STEAM dan dapat diketahui hubungannya dengan life skill yang dikembangkan mahasiswa. Batik dibuat dalam rangka Merdeka Belajar-Kampus Merdeka (MB-KM) untuk bahan baju dengan ukuran 90 x 200 cm sebagai produk karya mahasiswa.
Kata Kunci: kimia anorganik, life skill, motif batik jambi, PjBL, STEAM, terintegrasi
Pengujian Kandungan Boraks dan Formalin Pada Makanan Dengan Menggunakan Simple Methods Di Kelompok PKK Km. 13 Pondok Meja
Get PDFDewasa ini boraks dan formalin banyak sekali digunakan dalam industri makanan, seperti: dalam pembuatan mie basah, tahu putih, tahu kuning, bakso, sosis, dan ikan asin. Padahal zat kimia ini merupakan bahan beracun dan bahan berbahaya bagi manusia sehingga sangat dilarang digunakan sebagai bahan baku makanan. Kebanyakan masyarakat mengira bahwa pengujian boraks dan formalin dalam makanan yang dapat dibuktikan kebenarannya, harus dilakukan di laboratorium sehingga memerlukan biaya mahal, padahal ada beberapa cara sederhana yang dapat dilakukan tanpa harus melakukannya di laboratorium. Sehingga perlu adanya alternatif cara identifikasi kandungan boraks maupun formalin pada makanan dengan cara yang sederhana (simple method) dan bisa dilakukan di rumah menggunakan bahan-bahan yang ada di sekitar kita tanpa harus dilakukan di laboratorium dengan menggunakan bahan-bahan kimia. Dalam kegiatan ini, alternatif yang bisa dilakukan yaitu menggunakan kunyit untuk identifikasi boraks dan getah pepaya muda untuk identifikasi formalin. Target kegitan pengabdian kepada masyarakat yang ingin dicapai adalah : (1) memberikan pengetahuan tentang bahaya boraks dan formalin bagi kesehatan; (2) memberikan informasi melalui penyuluhan tentang ciri-ciri makanan yang mengandung boraks dan formalin; (3) pelatihan tentang pengujian bahan makanan yang mengandung boraks dan formalin menggunakan simple method; (4) mitra mempu menerapkan cara pengujian boraks dan formalin di kehidupan sehari-hari sehingga kesehatan keluarga lebih terjamin
Integrated Project Based Learning (PjBL) with STEM and Field Study in Elemental Chemistry Learning
Get PDFThis research investigates the effectiveness of a project-based learning (PjBL) model integrated with Science, Technology, Engineering, and Mathematics (STEM) in enhancing students critical thinking and field study skills in Elemental Chemistry. The study aims to assess how this integrated approach influences student learning activities, including engagement with scientific literature, teamwork, cognitive skills enhancement, and the development of teaching materials for independent discovery. A mixed-methods approach was used, combining statistical analysis of quantitative data with qualitative insights from observation sheets, interviews, and student worksheets. The curriculum included soft skill training in sampling teak sawdust (Tectona grandis) and synthesizing oxalic acid, Ca, Ba, and Mg-oxalic compounds in the lab. Results showed significant improvement in student grades in the Elemental Chemistry course, with average scores in the good category ranging from 71.05% to 79.55%, indicating the PjBL model is effective. Furthermore, the development of an Elemental Chemistry learning kit specifically designed for the PjBL approach effectively enhanced student thinking skills, as evidenced by their achievements in STEM-related tasks, highlighting the potential of integrated learning method in improving educational outcomes in higher education chemistry courses
Green Synthesis of Silver Nanoparticles Using Areca Catechu L Peel Bioreductor as an Antibacterial Escherichia Coli and Staphylococcus Aureus
No full textAreca nut or Areca catechu L is a plant that has many benefits, one of which is that it can be used as medicine. There are secondary metabolite compounds in betel nut. The presence of this secondary metabolite content makes the betel nut skin a high potential as a bioreductant to synthesize silver nanoparticles as an antibacterial. The process of synthesizing silver nanoparticles is carried out with the addition of a stabilizer in the form of Polyvinyl alcohol (PVA). The analysis results obtained using the UV-Vis instrument have wavelengths with variations in the addition of 1%, 3% and 5% PVA, respectively, are 448 nm, 456 nm and 460 nm. In the results of the analysis using XRD, the value of 2θ is silver nanoparticles (PVA 1%): 38,020; 43,930 ; 64,320 ; 77,270. silver nanoparticles (PVA 3%): 38,230; 44,270 ; 64,610 ; 77,500. And silver nanoparticles (PVA 5%) are 38,100 ; 44,240 ; 64,460 ; 77,370. For analysis using SEM, the particle size obtained with the help of the Imegej and OriginLab 8.5 applications, namely at AgNPS + PVA 1% is 28 nm - 31 nm. Agnps + PVA 3% ranged from 26 nm – 29 nm. And Agnps + PVA 5% has a size of 19 nm – 22 nm. For the results of FTIR data, the specific absorption peaks of Ag nanoparticles are located at frequencies of 412.23 cm-1, 453.57 cm-1, and 476.84 cm-1. Then in the antibacterial test, silver nanoparticles were used with the addition of 5% PVA. The size of the clear zone obtained in the test for E. coli bacteria is 11.2 mm and for S. Aureus it is 13 m
PENINGKATAN KUALITAS MINYAK DARI PLASTIK POLIPROPILEN DENGAN MENGGUNAKAN BENTONIT/KARBON AKTIF
Get PDFBentonit dan karbon adalah bahan yang biasanya menyerap zat warna dan pengotor pada minyak. Kemampuan bentonit dan karbon dapat ditingkatkan dengan aktivasi untuk memperbesar luas permukaan. Tujuan dari penelitian ini adalah mengadsorpsi minyak plastic untuk meningkatkan kualitasnya. Adsorpsi ini mengunakan variable warna, sulfur dan nilai kalor. Proses aktivasi karbon mengunakan akitivator KOH sedangkan bentonit menggunakan pemanasan 110 0C. Hasil penelitian ini menunjukan bahwa pencampuran karbon aktif dan bentonit memberikan pengaruh terhadap nilai kalor dan kandungan sulfur setelah proses adsorbsi pada minyak plastic yang dihasilkan. Kata Kunci: Bentonit, karbon, minyak plastik, bensin, adsorpsi
Synthesis and Characterization of Adsorbent Materials Magnetite Mercaptosilicate Ion Imprinted Polymer as Cadmium Ion Adsorbent
Get PDFCadmium (Cd) is a toxic heavy metal with the active property of reacting with other components so that cadmium residues can quickly enter the food chain and cause cardiovascular, kidney, and cancer diseases. The purpose was to synthesize the magnetite mercaptosilicate ion imprinted polymer adsorbent material by forming Ion-Imprinted Polymer as a template, to analyze the characterization results using XRD and SEM-EDS, and to determine the adsorption test results for Cd metal ions. The results of the characterization of XRD show that there is a broad peak at a diffraction angle of 2θ= 20-220 with an amorphous structure, which is silica, and there is a high peak at a diffraction angle of 2θ= 35.55140 which indicates magnetite. The results of SEM analysis with magnifications of 500x, 1000x, and 5000x showed that the surface morphology of the particles was not uniform. For the EDS results, it can be seen that the components of the magnetite mercaptosilicate ion imprinted polymer material are elements C, O, Si, S, and Fe, with a mass percentage of 25.0%; 41.2%; 29.9%; 3.28% and 0.8%. The results of the adsorption test for the Magnetite-IIP-Mercaptosilika Material were able to adsorb Cd ions with the highest adsorption capacity of 10.536 mg/g at a concentration of 100 mg/L. Then the selectivity coefficient value of the Ion Cd metal ion is 2.32 greater than 1, indicating that the selectivity of the magnetite mercaptosilicate ion imprinted polymer material is much higher for Ion Cd metal ions than for Cu and Cr ions with a selectivity coefficient of 0.1 and 0.26
