Penelitian ini bertujuan untuk mengetahui efisiensi inhibisi dan laju korosi baja SS-304 dalam larutan H2SO4menggunakan ekstrak daun pandan (Pandanus amaryllifous Roxb) dengan metode gravimetri. Ekstrak daun pandan diperoleh melalui ekstraksi maserasi menggunakan etanol. Hasil uji fitokimia ekstrak daun pandan menunjukkan adanya kandungan senyawa-senyawa metabolit sekunder flavonoid, steroid, alkaloid, antrakuinon, dan tanin. Pada uji inhibisi korosi, dilakukan variasi konsentrasi ekstrak daun pandan dan suhu untuk mengetahui pengaruhnya terhadap efisiensi inhibisi korosi baja SS-304 dalam larutan H2SO4 1 M selama 3 jam. Hasil penelitian menunjukkan bahwa efisiensi inhibisi meningkat dengan peningkatan konsentrasi inhibitor, yang berarti semakin menurunnya laju korosi. Efisiensi inhibisi optimum diperoleh pada konsentrasi inhibitor 0,8%, yakni 89,06% dengan laju korosi 5,15 mm/tahun. Sebaliknya, meningkatnya suhu mengakibatkan menurunnya efisiensi inhibisi, yang berarti meningkatnya laju korosi. Efisiensi terrendah diperoleh pada suhu 50 °C, yakni 11,56% dengan laju korosi 74,33 mm/tahun.
Adsorption study of the adsorption of heavy metal ions from Fe (III) using sago dregs waste was carried out. adsorption was carried out in batches, with the mass of adsorbent is 1 g and the concentration of Fe (III) ion is 10 ppm. in this study variations in contact time were 60, 90, 120, 150 and 180 minutes to determine the kinetic suitable for the adsorption process of ion Fe (III) and the capacity and efficiency of sago dregs adsorption. The results showed that the adsorption of ion fe (III) using sago dregs followed pseudo second-order kinetics with R2 values that were closer to 1 that is 0,9651. adsorption of ion Fe (III) at optimum contact time of 90 minutes with adsorbent mass of 1 g obtained by adsorption capacity 0,3211 mg/g and the adsorption efficiency is 64,2%.
The preparation and characterization of charcoal from sago pulp as an adsorbent in reducing content of COD and BOD of tofu factory waste has been carried out. Sago pulp has been turned into charcoal through carbonization at 400oC for 2 hours. The results of charcoal characterization using XRD show that the carbon produced from sago pulp carbonization has a low crystallinity which is indicated by a wide peak at around 2θ 23oC, which is the characteristic carbon peak. The results of characterization using Surface Area Analyzer show that the pores in the sago pulp charcoal are very few and irregular, and dominated by macropores. The results of the characterization using SEM showed that sago pulp charcoal had very few pores. The material is dominated by the residue from the results of non-porous carbonization. Performance as an adsorbent to reduce the content of COD and BOD in tofu mill wastewater by batch method shows the capacity and efficiency of adsorption on COD of 75.00 mg/g and 35.21%, respectively. While capacity and efficiency of adsorption on COD of 7.00 mg / g and 3.57%, respectively
Telah dilakukan penelitian untuk menentukan kondisi optimum pelapisan baja karbon rendah menggunakan logam seng (Zn) dengan metode elektroplating. Penelitian ini menggunakan beberapa variabel yaitu waktu, arus, suhu, dan pH larutan. Hasil penelitian menunjukan bahwa kondisi optimum untuk menghasilkan kualitas lapisan yang baik adalah pada waktu 10 menit, arus 0,4 ampere, suhu 40oC dan pH 3. Setelah dilakukan uji korosi, baja karbon rendah yang telah dilapisi seng (Zn) mempunyai daya tahan yang tinggi terhadap korosi dibandingkan baja karbon rendah tanpa pelapis. Hal ini disebabkan seng (Zn) sebagai logam pelapis dapat membentuk lapisan oksida yang melindungi baja karbon rendah terhadap kerusakan lebih lanjut.
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