PEGASUS (the application of technology using the Chemcollective’s Virtual Chemistry Laboratory) is a process of learning modern techniques by using computer simulations based on understanding chemistry. The purpose of this method is to understand a subject and solve the solution to the limitations or absence of laboratory equipment. The advantage of this simulation method is that access is easy, flexible, safe and does not require expensive fees. The results of the application of Vlab show that it is very helpful for students in understanding chemistry learning especially in lab analysis, this is evidenced from the post test results which are significantly higher than the pretest given at the beginning of the activity so it can be concluded that the application of Chemcollective’s Virtual Chemistry Laboratory is very good for introduced and studied further. Keyword: chemistry, laboratory, simulation, Chemcollective’s
The high content of carbon compounds in palm fronds (OPF) makes them potentially useful as an adsorbent. The carbonization method was used for the adsorbent synthesis process. This process began with collecting palm frond waste and then drying and sifting the adsorbent particle. This process resulted in the escape particles with a size of 80 mesh and suspended particles with 120 mesh. Then this process continued by carbonizing the palm fronds with temperature variations starting from (400, 500, and 600°C) for 60 minutes to obtain Charcoal Oil Palm Fronts (COPF). The obtained COPF was determined for moisture and ash content and characterized using FTIR, XRD, and SEM to determine the surface, functional groups, degree of amorphism, crystallinity, and surface morphology. The adsorption efficiency of COPF was applied to the adsorption of Fe (III) in peat water under varying contact time, adsorbent mass, and peat water volume conditions. The water and ash content of COPF qualify the technical quality requirements for activated charcoal according to SNI 06-3730-1995. FTIR analysis detected the presence of vibrations of the C-O, O-H, C=O, C-C, and C-H functional groups on the COPF surface. The XRD pattern showed the existence of a semi-crystalline (002) and (100) plane structure, which is shown at scattering angles of 2θ = 22o and 42o. The surface morphology of COPF showed that as the carbonization temperature increased, the number of pores formed increased, and the pore size decreased. The best adsorption test results were obtained with a contact time of 30 minutes, an adsorbent mass of 1.00 g, and a peat water volume of 100 mL. The highest Fe adsorption efficiency was achieved by COPF 500, where the adsorbed mass was 0.054 mg. Increasing the carbonization temperature causes the water content to decrease and the ash content to increase. High water content and ash content cause a decrease in adsorption efficiency because they can cover the pores of the adsorbent.
Ilmu kimia tidak dapat dipisahkan dengan percobaan di laboratorium sebagai bentuk penambahan pemahaman dan pembuktian teori kimia. Permasalahannya, Praktikum kimia memerlukan anggaran yang sangat besar dan penanganan tinggi untuk pembangunan laboratorium, fasilitas peralatan, bahan-bahan kimia dan tempat penyimpanan. Maka, terdapat metode pembelajaran baru yaitu PenerapanTeknologi Chemcollective’s Virtual Chemistry Laboratory dengan mensimulasikan praktikum kimia pada aplikasi computer bernama Virtual Lab/Vlab. Hal ini bertujuan memudahkan pemahaman ilmu kimia melalui simulasi praktikum serta memecahkan solusi keterbatasan atau ketiadaan peralatan laboratorium. Metode yang digunakan adalah tahap persiapan instalasi software di PC dan Laptop kemudian pelatihan mempraktekkan secara langsung materi kimia menggunakan Vlab. Pembelajaran objek praktikum menggunakan Vlab salah satunya Asidimetri dan Stoikiometri. Stoikiometri merupakan ilmu kimia yang mempelajari hubungan kuantitatif antara zat-zat yang terlibat dalam reaksi kimia. Titrasi asidimetri adalah proses penentuan konsentrasi basa dengan menggunakan larutan asam sebagai standar. Pada objek Asidimetri nilai rata-rata Pre Test 54 dan Post Test 70, objek Stoikiometri Pre Test 80 dan Post Test 81. Hasil Post Test yang signifikan dibandingkanPre Test padapelatihan di SMAN 1 Bungaraya Siak ini menunjukkan metode Vlab dapat meningkatan pemahaman siswa terhadap konsep kimia, dan disimpulkan Vlab sangat baik untuk diperkenalkan, dipelajari dan diterapkan lebih lanjut di berbagai sekolah.
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