IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)
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Characterization of Fly Ash Catalyst Using XRD Method for Biofuel Production from Used Cooking Oil
Full text linkFly ash catalyst that has been activated using NaoH 2M was analyzed using XRD at an angle of 2θ = 15 ° - 80 ° with a wavelength (λ) of X rays of 0.15406 nm. From the results of the analysis, the NaO26Si6Y9 compound is obtained with a hexagonal structure. Furthermore, the XRD analysis results obtained in the form of wavelength, intensity, 2θ and FWHM values will be substituted into the Debye Scherrer equation to calculate the size of the crystal structure of the Fly Ash catalyst. From this equation, a graph of the relationship between ln(b) dan ln(1/cos(q )) will be drawn so that the intercept value is - 4.0688 and the value of K = 0.9 and λ = 0.15406 nm. The value of K and λ can be calculated using the modified Debye Scherrer equation, so that the crystal size (D) is 8,10942 nm
Optimization of Bio-Oil Pyrolysis Product from Palm Empty Fruit Bunches over H-Zeolite Catalyst using Response Surface Methodology (RSM)
Full text linkBio-oil pyrolysis product considered as a promising resource of hydrocarbon compound that can be used as alternative fuel or other application. Palm empty fruit bunch (PEFB) based bio-oil converted into hydrocarbon trough pyrolysis over sulfate activation natural zeolite. Here, we reported an optimization process of bio-oil pyrolysis specifically on temperature and catalyst dose variables by using response surface methodology (RSM). Prior conversion process, PEFB was analyzed to determine cellulose, hemicellulose and lignin content. Sulfate activation natural zeolite confirmed its acidity by ammonia and pyridine adsorption calculated by gravimetric method. Two independent variables namely temperature and catalyst weight used in optimization process by RSM whereas response variable is conversion percentage. Analysis result on cellulose, hemicellulose and lignin content are 45.39%, 30.36% and 20.5% respectively. Catalyst acidity determination based on ammonia and pyridine adsorption gave 1.002 mmol/g and 0.1994 mmol/g. Optimum condition of hydrocracking achieved at 568 °C and 2.1088 g catalyst weight with the product obtained at 62.21% conversion. The best product density is 1.086 g/mL obtained at hydrocracking temperature 554 °C and 2.0362 g catalyst. Based on GC-MS analysis, it was confirmed that the product comprises more straight-chain hydrocarbon than cyclic one. RSM calculation able to formulate the feasible model equation to predict the conversion percentage. The equation is; percent conversion = 60.059 + 14.268T + 9.783W – 25.649T2 – 18.809W2 + 3.114TW, whereas model equation for response variable on product density; ρ= 1.09103 – 0.12356T – 0.09744W + 0.11489T2 + 0.28888W2 – 0.00740T
Study of Effect of Weight Ratio on Copolymerization of Chitosan and Acrylamide
Full text linkThe use of chitosan as adsorbent in wastewater treatment has received a lot of attention. This is because the price of chitosan is cheap and easy to obtain. The application of chitosan as an adsorbent has the disadvantage of being soluble in acidic medium (pH <6.5), insoluble in water and organic solvents. Other disadvantages of chitosan are low adsorption capacity, and lack of selectivity. In this research, chitosan copolymer synthesis with acrylamide has been carried out by varying chitosan and acrylamide, namely 1:1, 2: 3 and 3: 2 using a microwave oven. The copolymers were characterized using FTIR, XRD, SEM and TGA/DTA. The results of the synthesis of chitosan copolymer with acrylamide were obtained the largest percentage of grafting at a ratio of 2: 3. From the results of FTIR analysis showed that the copolymer had been successfully synthesized. XRD analysis showed that the copolymers synthesized have amorphous properties compared to chitosan. The results of SEM analysis, the copolymers had a porous structure. Thermal analysis showed that the copolymers have better thermal stability than chitosan. The chitosan-acrylamide copolymer which was synthesized in a ratio of 2: 3 has better properties
The Analysis of Manganese (Mn) in Waste Water Treatment (IPAL) of Coal Mine of PT Bukit Asam Indonesia
Full text linkWastewater from the coal mining process containing heavy metal manganese is bad for water body and health of living things around it. The South Sumatra Governor Regulation states that the content of iron (Fe) and manganese (Mn) must contain a maximum total of 7 mg/L and 4 mg/L before being released into the environment. This study aimed to verify the total dissolved Mn analysis method. Thirty-four (34) samples from the wastewater treatment plant pond were digested and measured by the Atomic Absorption Spectrophotometer (AAS) at a wavelength of 279.5 nm. The analyzes performed were the precision, sensitivity, linearity, LOD detection limits and LOQ quantization limits. The measurement results showed the parameter value for a precision of 1.562%; linearity (coefficient of determination) standard curve 0.9939; sensitivity 0.0375; LOD 0.4287 g/mL; and LOQ 1.4291 g/mL. In conclusion, the measurement data for the total dissolved manganese met the quality standards for wastewater stated in the Regulation of the Governor of South Sumatra No.8 of 2012 by applying the predetermined method
Synthesis and Characterization of Amorphous TiO2 Anode Prepared by Anodizing Method for Na-ion Batteries
Full text linkSodium ion battery (SIB) has engage sustainable alternative on replacing lithium ion batteries. The lower potential and larger ionic value has demanded on seeking a potential anode materials. Amorphous TiO2 prepared by electrochemical anodisation technique has provide a suitablility as anode SIB materials, which approved by conducting XRD, FTIR, and SEM-EDX measurements. Electrochemical performance was tested with variations in the concentration of NaOCl4 electrolyte in propylene carbonate (PC) solvent. Diffractogram of TiO2 showed the only peaks of Ti was observed at 2θ = 40.34. The TiO2 IR spectrogram shows that the absorption band at 507 cm-1 is the peak of the vibration characteristics of the Ti-O bond and the peak of 975 cm-1 corresponds to Ti-O-Ti bond. SEM-EDX image analysis showed the morphology of TiO2 was smooth without pore with a ratio of Ti: O elemental composition of 1: 2. Voltammogram showed the anodes in 0.5 M NaOCl4 electrolyte in PC solvent has a good stability potential windows with the high current density 1.2 mA and the capacity of 0.037 F/
Bioethanol from Pineapple Peel with Variation of Saccharomyces Cerevisiae Mass and Fermentation Time
Full text linkThe avaibility of energy from fossil fuel is gradually decreasing. The solution to overcome this problem is to develop an alternative energy source that can be renewed such as bioethanol. Bioethanol is a vegetable based fuel, an alternative energy that can be used as a subtitute for petroleum. One of the raw materials that can be used for the fermentation of bioethanol production is pineapple fruit skin. This research aims to utilize pineapple fruit waste as raw material for making bioetanol by fermentation process, with variations in the addition of saccharomyces cereviceae 20, 25 and 30 g, and time fermentation 5 and 9 days. The highest levels of bioethanol obtained 6,83 % at the addition of 25 g saccaromces cereviceae and fermentation time of 5 days. Keywords: pineapple skin, saccaromyces cereviceae, fermentation, bioethano
Alkaloids of Fagraea fragrans (Tembesu) Fruits
Full text linkThe aim of this paper is to visualize the alkaloids of Fagraea fragrans fruits therefore the fruits can be scientifically used as herb traditional medicines and phytocosmetics. Three alkaloids have successfully been identified from those Fagraea fragrans fruits, Loganiaceae. They are gentialutine, gentianine, and isaindigotone. The alkaloids were alternately explored by means of ether and 2% H2SO4 extractions. The sulphuric acid phase was naturalized with ammonium chloride and then extracted with ethyl acetate. The residue were then subjected to silica gel G60 (70-230 mesh) column chromatography and eluted with 40% ethyl acetate in n-hexane. The LC-MS spectral of alkaloids gave the protonated molecular ion peaks at m/z (r.t. minute) = 150.08 (1.39), 176.06 (4.80), and 351.37 (5.24) respectively
Characterization and Investigation on Photocatalytic Activities of TiO2/Coconut Shell-Based Activated Carbon
Full text linkCoconut shell-based activated carbon-supported TiO2 catalyst had been prepared with a sol-gel method using titanium tetraisopropoxide acting as TiO2 precursor. TiO2/activated carbon photocatalyst was characterized with X-Ray Diffraction (XRD), Fourier Transform-Infrared (FT-IR), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), and surface area analysis using Brunauer–Emmett–Teller (BET) adsorption-desorption isotherm. Photocatalytic activities of TiO2/activated carbon were investigated through the degradation of indigo carmine using UV light. The highest degradation percentage (%D) obtained for the indigo carmine was 91.79% at pH 3 and an initial concentration of 5 mg L-1 after 25 min radiation. TiO2/activated carbon showed higher photocatalytic activities when sunlight was used, in comparison to that of UV light.
Biofuel from Pyrolysis Waste Lube Oil of Refinery Unit III Using Fly Ash of Coal Combustion as a Catalyst
Full text linkLube oil waste obtained from Utilitis Unit, Crude Distillation Unit, Crude Distillation & Ligh End Unit at Refinery Unit III Plaju Palembang South Sumatra. The process of pyrolysis of lube oil waste using fly ash catalyst is expected to produce fuel oil. Lube oil waste pyrolysis uses Fly Ash catalysts with a total catalyst of 500 gr with a temperature range variation of 0-85oC, 85-16 oC, 165-250oC, 250-300oC, and 300-350oC, while pyrolysis of waste lube oil without catalysts with a variation in the temperature range of 0-85oC, 85-165oC, 165-250oC, 250-300 oC, and 300-350 oC. Temperature range variations are referenced based on boiling route solvent fraction (0-85 oC), premium fraction (85-165 oC), kerosene fraction (165-250 oC) and diesel (250-350 oC). Solvent fraction can not be analyzed because there is no product result whether it is pyrolysis process using catalyst or without catalyst, Premium Fraction is only produced using catalyst, Sulfur content analysis result, Mercaptane sulfur, Density meets Premium fuel specification except Octane Number 76.6. Sulfur content, Density and flash point analysis of pyrolysis products using catalysts and without catalysts in accordance with kerosene products in the market. Solar fraction of pyrolysis process using catalyst and without catalyst, Analysis results density, sulfur content, Total acid number, Water Content entered solar product specifications but cetane numbers 43.2 and 45.6 have not met the specifications of solar products.
Optimization of Protection Condition on the Stability of Castor (Ricinus communis) Oil Based Biodiesel using Response Surface Methodology
Full text linkThe effects of designed protection conditions such as different antioxidant (propyl gallate, PG and Pyrogallol, PY), antioxidant concentration (30 – 600 ppm), temperature (30˚C -120˚C) and storage period (3 – 5 days) on the oxidation stability of castor biodiesel were investigated. Using the American Standard for Testing Materials (ASTM) recommended protocols to determine the changes in the physicochemical properties (acid value, p-anisidine value, peroxide value, totox value, density, kinematic viscosity and refractive index ) of the castor biodiesel were measured and protection conditions optimized using the Response Surface Methodology (RSM) according to the Box–Behnken Design (Design Expert version 11 Statistical Software). The analysis of variance (ANOVA) showed results indicated the nature of antioxidants; concentration levels and temperature were the most important factors in the biodiesel oxidation, whereas the day of storage was one of the lowest factors. The changes in some important physicochemical values are indication of degradation occurring in the biodiesel under the set storage condition. The optimal conditions for better protection against biodiesel degradation were propyl gallate with the concentration of 316.634 ppm, temperature of 57.874 oC for 4.166 days produced refractive index of 1.515 oC, acid value of 1.423, p-anisidine value of 21.068 and Totox was 1.842 with the overall desirability of 1.000. The overall results showed that castor biodiesel could comply with the standard with PY being more effective than PG. The combined use of these antioxidants did not show, especially at low concentrations, a synergic or additive effect, which makes the mixture of these antioxidants unsuitable to improve the oxidative stability