Jurnal Riset Kimia
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PENARIKAN ION Cu2+ (CuSO4) DARI LARUTAN AIR MELALUI PROSES ELEKTROLISIS SECARA FOTOVOLTAIK DENGAN SEMIKONDUKTOR LAPISAN OKSIDA CuO DAN ZnO DARI KUNINGAN
Full text linkPhotovoltaic is a method that can convert sunlight energy into electrical energy. One use ofphotovoltaic electrolysis can be used for metal ions contained in the liquid waste. The research aims electrolyzing Cu2+ ions from aqueous solution using a series of photovoltaic cells with semiconductor CuO and ZnO oxide layer of brass with Na2SO4 electrolyte. The series of photovoltaic cells is associated with an electrolysis cell containing Cu2+ ions to be electrolysed. Semiconductor electrodes made with brass burning in a furnace in a few repetitions at a temperature of 400°C for 1 hour. U-shaped electrolysis cells glass tube containing a solution of CuSO4 1.25 g/L using a carbon rod as anode and cathode. Electrolysis of Cu2+ ions results were analyzed by Atomic Absorption Spectrofotometer (AAS). The results showed that the optimum conditions Na2SO4 electrolyte concentration 0.8 N with semiconductor double-furnace with a strong current 0.829 mA and a voltage of 0.241 mV, the value of efficiency of conversion of solar energy into electrical energy is 0.599%. Electrolysis of Cu2+ ions for 4 weeks could reduce Cu2+ ions concentration of 35 mg/L to 15.909 mg/L (45.45%). CuO and ZnO electrodes was relatively less stable and cause strong currents and voltage drop along the length of the process
ISSN : 1978-628X KINETIKA TRANSPOR FENOL DENGAN ADITIF SURFAKTAN DALAM TEKNIK MEMBRAN CAIR FASA RUAH
Full text linkStudy of transport of phenol using the surfactant SDS (Sodium Dodecyl Sulfate), Tween-80 as additive in the source phase and oleic acid, Span-60 additive in the membrane phase with bulk liquid membrane techniques has been performed. Transportation system was in one way using solution of phenol 2.13 x 10 -4 M as the source phase, 30 mL of chloroform as membrane phase, a solution of 12 mL of 0.1 M NaOH as the receiving phase and stirring speed of 340 rpm. The concentration of phenol that transported into receiving phase and remaining in the source is determined by measuring phenol method using 4-aminoantipirin and monitored with a spectrophotometer. The result showed the percentage of transport of phenol into the receiving phase is 93.07% within 120 minutes without any additive surfactant, while for additive oleic acid and Span-60 the percentage of transport phenol is 97.28% and 88.84% within 90 minutes. Phenol transport system analyzed by means of a kinetic model involving consecutive irreversible first order reaction with the constants extraction of phenol from the source to the membrane (k1) of 0.0346 minute-1, 0.0304 min-1, and from the membrane phase into the receiving phase (k2) of 0.0264 min-1, 0.0309 min-1 each for additive oleic acid and Span-60 in the membrane phase. Surfactant SDS and Tween-80 additive in the source phase is not effective to decreased the transport time of the phenol in the phase bulk liquid membrane technique
PENENTUAN TINGKAT KANDUNGAN AMONIAK, NITRIT, DAN NITRAT PADA REMBESAN SAMPAH LOKASI PEMBUANGAN AKHIR (LPA) AIR DINGIN KOTA PADANG
Full text linkDetermination of amoniac, nitrite, and nitrate content in seepage waste water in landfill area in cold water, Padang have been done using spectrophotometric method. Sample took from sequencing ofseepage waste water treatment process. The results showed that the ammonia, nitrite, and nitrate content in seepage waste water were 137.612 to 400.298 mg/ L, 0.34 to 0.756 mg/ L, and 0.682 to5.842 mg/ L, respectively. The differences of ammonia, nitrite, and nitrate content in seepage waste water and ammonia and nitrite contents tend to decrease while the nitrate content tends to increase. The rate of ammonia degradation in water seepage was different for each sampling place where the rate of degradation was greatest in seepage water waste treatment II. This degradation is expected to reduce the level of pollution on the environment
PEMECAHAN (SPLITTING) MOLEKUL AIR MENJADI GAS H2DAN O2 MELALUI PROSES FOTOVOLTAIK
Full text linkOne method to overcome the scarcity of alternative sources of energy on earth is through the development of photovoltaic cells. This method used a solar energy to electrical energy transformation. In this research, breaking (splitting) of water molecules into H2 and O2 gas by the photovoltaic process uses electrodes CuO/C with Na2SO4 electrolyte. In this process used 2 photovoltaic cells as electricity producing and U-shaped electrolysis cell for solver (splitting) of water molecule produce H2 and O2 gas. CuO electrode (anode) is made through the burning of copper rod in a furnace at temperature 400 oC with a variety of combustion 1, 3, 4 times each lasting for 1 hs, while the cathode in the form of carbon rods obtained from 2B pencil. The optimum conditions for Na2SO4 electrolyte concentration is 0.8 N and for CuO electrodes with 3x burning. Optimum efficiency photovoltaic process was 2.66%. H2 and O2 gas volume obtained near stoichiometric ratio is 2 : 1
PENGOLAHAN LIMBAH POLIPROPILEN MENJADI BAHAN BAKAR CAIR MELALUI METODE PIROLISIS
Full text linkPlastics 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)