Fe3O4 (magnetite) nanoparticles were synthesized by chemical co-precipitation method. The structure, morphology and magnetic properties of as-prepared were characterized by X Ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X Ray Spectrometry (SEM-EDS), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). The result of XRD characterization was indicated Fe3O4 as the product. SEM and TEM image of the Fe3O4 showed nanoparticles Fe3O4 have the mean diameter 5-20 nm. The EDS spectra showed strong peaks of Fe and O. Magnetic characteristic of Fe3O4 nanoparticles was indicated super paramagnetic properties. The saturation magnetic was 89.46 emu g-1. Therefore, the nanoparticles Fe3O4 is suitable to remove dye in the water by a simple magnetic separation process. The optimum adsorption occurred at initial concentration of procion dye 100 mg L-1, pH solution 6, dosage of Fe3O4 0.8 g L-1 and contact time 30 minutes under room temperature with color removal 24.40 % and adsorption capacity was 30.503 mg g-1

The purpose of this work is to study the extractive capacity of an organophosphorus compound to recover carboxylic acids from the waste water resulting from the ozonation process for the bleaching of pulp in order to reduce the environment pollution. In this work, the selected solvent was composed of a mixture of tributyl phosphate (60 vol %) with dodecane (40 vol %) and the solutes under consideration were acetic, formic, and oxalic acids. With no exception, it is the undissociated acid that is extracted by the solvent. Ternary system solubility diagrams water + carboxylic acid + tributyl phosphate and tie-line data were established at the temperature of 25 °C. In comparison with the conventional extraction solvents such as alcohols, ketones, or ethers, which involve the solvation of the acid by donor bonds, the more basic donor properties of phophorus-bonded oxygen compounds show the stronger extractive capacity of this group of extractants. Furthermore, the carbon-bonded oxygen solvents are much more soluble in water and hence involve a costly solvent recovery. With regard to the tertiary amine extractants, which have low residual solubilities in water and high extractive power for several acids, the selectivity of organophosphorus compounds with respect to an individual carboxylic acid can be considered as an attractive property of this category of solvent. In this study, partition coefficients between 0.27 and 1.25 were determined for the separate acids.

Penyakit diare masih menjadi permasalahan utama di negara-negara berkembang termasuk di Indonesia terutama terjadi pada balita. Kelurahan Karyajaya Kota Palembang merupakan salah satu wilayah yang jumlah penderita diarenya mengalami peningkatan dari tahun ke tahun. Selain itu, masyarakat di Kelurahan Karyajaya memiliki cakupan presentase rumah yang memenuhi syarat rumah sehat yang masih rendah. Untuk itu dibutuhkan penelitian untuk menganalisis faktor-faktor yang mempengaruhi kejadian diare pada balita di Kelurahan Karyajaya Kota Palembang.

The increase in energy consumption and an increase in plastic waste generation are two major problems that arise along with economic growth and the increase of population. Styrofoam is one type of polystyrene plastic waste that can be processed into liquid fuels by cracking process. In this study, the cracking process of polystyrene plastic waste into liquid fuel carried by the catalytic cracking process using Al 2 O 3 as catalyst. This study aimed to determine the effect of the catalyst weight, length of cracking time and range of temperature in the catalytic cracking process of polystyrene plastic waste into liquid fuel toward the mass and characteristics of liquid fuels produced and to determine the composition of liquid fuels produced. The catalytic cracking process of polystyrene plastic waste with catalyst was done in the fixed bed type reactor by heating the reactor with a heater, where the process took place at temperature of 150°C, 200°C, 250°C and 300°C and the length of the process was varied into 20, 40, and 60 minutes and the catalyst weight was also varied, which were 4%, 6% and 8%, while the styrofoam weight was 250 grams. From the research, the highest mass of liquid fuel derived from polystyrene catalytic cracking process was in the amount of 48.8 grams and liquid yield percentage of 19.5% at temperature of 250°C, cracking time of 60 minutes and weight of 8% catalyst, while the characteristics of liquid fuel that were approaching the characteristics of gasoline was at temperatures of 250°C, cracking time of 60 minutes and weight of 6% catalyst, in which each value of density of 0.763 g/ml, specific gravity of 0.778 and o API gravity of 50.2. While other liquid fuels obtained from the cracking of polystyrene were still within the tolerance range characteristic properties of gasoline. Liquid fuels produced from the catalytic cracking process was analyzed using a GC-MS, in which the analysis results indicated that liquid fuels were included into the gasoline fraction.

This paper presents the characteristics of bio-briquette resulted from a series process using a mixture of raw materials. As raw materials of biobriquette production, this research used biomass corn cobs and banana peels, and a fine coal waste. Before using as a component in the biobriquette, corn cobs, banana peels, and fine coal waste were carbonized. The carbonation process was carried out in temperature of 300-500 o C for 15 minutes. Carbonized corn cobs, banana peels, and a fine coal waste were characterized for calorific value and ash content. In this work, the influence of composition carbonized biomass and carbonized coal has been investigated. Before and after carbonization of biomass and coal, the calorific value and ash content of corn cobs were 4,239-6,386 kcal/kg and 3.47-8.12 % adb respectively, for banana peels were 4,135-6,042 kcal/kg and 16.99-32.31 % adb respectively, and for coal were 5,857-6,330 kcal/kg and 5.81-6.64 % adb respectively. The highest calorific value of biobriquette of 6,297 kcal/kg, highest fixed carbon content of 62.62 %, lowest volatile matter content of 26.18 % adb, lowest inherent moisture content of 5.14 % adb and lowest ash content of 6.06 were measured for composition of carbonized coal, carbonized corn cobs and carbonized banana peels ratio was of 1:4:0.

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Oil palm empty fruit bunch (OPEFB is one of the enormous waste expected to become a renewable energy source. This study aimed to convert OPEFB into syngas through a gasification process using bentonite as a catalyst. The effects of temperature and product gas catalysts were investigated, and the efficiency of the gasification process was summarized. The process has used an updraft gasifier at 350-550 °C and air as the gasification medium (ER 0.2). The results indicate that syngas can be produced by updraft gasifier. When the temperature increase, the H2 and CO rising. The highest H2 and CO content of 27.74% and 20.43% are obtained at 550°C when bentonite applied. HHV and LHV range of 3.38~12.79 MJ/Nm3 and 3.03~11.58 MJ/Nm3, respectively. The maximum carbon conversion efficiency (CCE) and cold gas efficiency (CGE) reach 85.49% and 82.34%. Bentonite has been able to increase the concentration of the gas composition especially H2 and CO and the heating value of syngas.

Coal mining activities can cause problems from for environment, especially the mining with surface mining method producing acid mine water. To solve these problems, we need to restore the output water conditionbefore it flows into the public waters so it can meet the environmental quality standard in accordance with the prevailing laws and regulations. In this research, coal mining waste management was done by phytoremediation technique. This technique is the use water plants to give wastewater treatment. Water plants was used in this study was Kiambang (Salvinianatans), Apu wood plant (Pistiastratatiotes), and water hyacinth (Eichhorniacrassipers). This research observed the effect of time on the absorption of iron (Fe) and manganese (Mn) and the species of plant was used as phytoremediation agent. The results of the study discovered that the highest metal absorption in plants (phytoremediation agents) for 30 days for Mangan (Mn) parameter was water hyacinth (Eichhorniacrassipers) and the most absorption agent for iron was Kiambang (Salvinianatans) while based on measurement of metal content in the wastewater of mining, water hyacinth (Eichhorniacrassipers) was the most effective agent to absorb the iron (Fe) and Kiambang (Salvinianatans) absorbed Mangan (Mn) the most.