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Ivandini Tribidasari A.
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Makara Journal of Science
Published by Universitas Indonesia
ISSN : 23391995     EISSN : 23560851     DOI : https://doi.org/10.7454/mss.v26i2.xxx
Core Subject :
Makara Journal of Science publishes original research or theoretical papers, notes, and minireviews on new knowledge and research or research applications on current issues in basic sciences, namely: Material Sciences (including: physics, biology, and chemistry); Biochemistry, Genetics, and Molecular Biology (including: microbiology, physiology, ecology, taxonomy and evolution); and Biotechnology.
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Articles 3 Documents
 1 
Search results for , issue "Vol. 21, No. 3" : 3 Documents clear
Simultaneous Combination of Electrocoagulation and Chemical Coagulation Methods for Medical Wastewater Treatment Muharam, Salih; Yuningsih, Lela Mukmilah; Rahmah, Citra Ibdau
Makara Journal of Science Vol. 21, No. 3
Publisher : UI Scholars Hub

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Abstract

Chemical coagulation, electrocoagulation, and combined electrocoagulation-chemical coagulation methods were used to reduce organic compound concentrations in medical wastewater. Some parameters in the methods were adjusted to optimize the process, including the applied current, distance between electrodes, number of electrodes, acid levels, coagulant type, and contact time. Chemical Oxygen Demand (COD) was used to indicate the total amount of organic compounds in the system. The results showed that the following conditions can be applied to achieve optimum results: 3 A of applied current, 4 pairs of electrodes, with 1 cm of distance between each electrode pair, a pH of 8, 1 g of polyaluminum chloride as the coagulant, and 3 hours of contact time. The optimum removal efficiency levels of total organic compound achieved via chemical coagulation, electrocoagulation, and the simultaneous combination of electrocoagulation-chemical coagulation methods were 41%, 62.51%, and 92.21%, respectively.
Studies of Power Conversion Efficiency and Optical Properties of Ni3Pb2S2 Thin Films Ho, Soon Min
Makara Journal of Science Vol. 21, No. 3
Publisher : UI Scholars Hub

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Abstract

Ni3Pb2S2 thin films were prepared by using a chemical bath deposition method. In this work, solar cells were fabricated using these materials as absorber layers. Power conversion efficiency testing will be carried out. The results show that these absorbent materials exhibit an open circuit voltage of 0.61 V, a short circuit current density of 9.9 mA/cm2, a fill factor of 0.47 and a power conversion efficiency of 2.7%.
Deposition and Characterisation of Pd-xSb2S3 Thin Films for Sustainable Solar Energy Applications Nwofe, Patrick; Idenyi, Ndubisi Edennaya
Makara Journal of Science Vol. 21, No. 3
Publisher : UI Scholars Hub

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Abstract

This study reports on the effects of different concentrations of palladium impurities on the optical and compositional properties of palladium-doped antimony sulfide (Pd-xSb2S3) thin films grown by the chemical bath deposition method. The films were grown at room temperature (25 °C) with other condition, such as pH at 3.2 and the complexing agent (polyvinyl alcohol), was kept constant. The concentration of the dopants was varied between 0.3 and 0.5 M. The films were annealed at an annealing temperature of 100 °C with the annealing time of 90 min. The films were characterized using the Rutherford backscattering spectrometry (RBS) techniques and optical spectroscopy (transmittance versus wavelength and absorbance versus wavelength) to investigate the composition and optical constants (optical absorption coefficient, energy bandgap, and extinction coefficient), respectively. The results show that the transmittances of the doped layers were higher than that of the as-deposited layers. The energy bandgap of the layers was direct and typically ≤ 2.80 eV.

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