Avocado seeds have been studied for use as corrosion inhibitors of mild steel in a solution of 0.75 M sulfuric acid. Corrosion inhibition efficiency at a concentration of 10 g / L avocado seed extract (ASE) was obtained at 74.56% with weight loss method and 68.38% with potentiometric polarization method. Corrosion inhibition efficiency was found to be greater with increasing ASE concentration. Polarization studies show that the avocado seed extract is a mixed corrosion inhibitor. SEM images on mild steel with the addition of ASE showed the formation of a thin layer on the mild steel surface. OH and CN functional groups appear on the FT-IR spectrum of ASE. These functional groups interact with iron on the steel surface to form a thin layer that can inhibit corrosive ion attacks from sulfuric acid solutions.
The Shorea sumatrana (tengkawang) plant is endemic to Indonesia, especially in Kalimantan and Sumatera regions, which produces chemical diversity especially as a natural drugs. Specific aims to investigate both the profile analysis of fatty acid and antibacterial potential of tengkawang oil. The extract of tengkawang oil was carried out using the soxhlet extraction method. The profile analysis of fatty acid was verified by GC-MS and the antibacterial activity was evaluated using disc-diffusion method. The profile analysis of fatty acid of tengkawang oil indicated the presence of palmitic acid (17.26%), stearic acid (60.68%), oleic acid (11.98%), oleic acid chloride (1.80%), stearic acid chloride (1.86%), glycidyl stearate (1.92%), diethyl phthalate (4%), and 2-monopalmitin (0.5%). We determined the antibacterial activity by the diameter of inhibition of growth zone against Salmonella enteritidis, Escherichia coli, Staphylococcus aureus, and Bacillus cereus at a concentration of 12.5%, 25%, 50%. These were compared with standard tetracycline as positive control and DMSO was assigned negative control. It was found that the highest percentage of fatty acid in tengkawang oil is stearic acid, at 60.68%, and that tengkawang oil is an antibacterial agent with a concentration optimum at 25% with more susceptibility to Gram-positive than Gram-negative bacteria.
Adsorbent magnetite-dimercapto-silica (Fe3O4 - DMS) is a synthesis of magnetite with 2,3-dimercapto-1-propanol which has been applied to adsorb anions [AuCl4] - and [Cr2O7]-2. The adsorption process of metal anion [AuCl4]- at pH 5 with a contact time of 100 minutes was found optimum results at an adsorption capacity of 77.58 mg/g and an adsorption efficiency value of 96.975%. While the optimum conditions of metal anion [Cr2O7]-2 after the adsorption process at pH 4 with a contact time of 90 minutes was found an adsorption capacity of 85.0426 mg/g and an adsorption efficiency value of 85.0426%. The adsorption efficiency of metal anions [AuCl4]- is higher than the adsorption efficiency of metal anions [Cr2O7] -2
Coffee bean husks waste contains chemical compounds such as tannins and flavonoids. These compounds are known to inhibit corrosion. Corrosion inhibition of mild steel in 0.75 M H2SO4 has been investigated using the presence and absence of coffee bean husk extract (CBHE). The effect of inhibition efficiency and corrosion rate on extract concentration and immersion duration was studied using the method of weight loss. The inhibition efficiency increases and the corrosion rate decreases with increasing immersion time and the concentration of CBHE. The corrosion inhibition efficiency was obtained 97.54 % obtained at 72 hours immersion and addition of CBHE 10 g/L. Steel surface adsorption was examined by SEM and FTIR spectroscopy. CBHE is recommended as a good inhibitor.
Karbon aktif magnetite Fe3O4 telah digunakan sebagai adsorben penyerap zat warna remazol yellow. Karbon aktif dibuat dari cangkang kelapa sawit dan dikompsoitkan dengan magnetite Fe3O4 dengan metode kopresipitasi. Adsorben digunakan untuk penyerap zat warna remazol yellow dengan mempelajari beberapa parameter penyerapan yaitu pengaruh pH, waktu kontak dan konsentrasi larutan Remazol Yellow. pH penyerapan diperoleh pada kondisi pH 2 dengan efisiensi penyerapan 84,613%, waktu kontak optimum pada waktu 45 menit dengan efisiensi penyerapan 71,79% dan dan konsentrasi optimum pada konsentrasi 45 mg/L dengan efisiensi penyerapan adalah 80,82%
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