DSpace 7

DSpace is the world leading open source repository platform that enables organisations to:

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Recent Submissions

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BIOSORBEN ARANG KULIT KAYU JABON PUTIH (Anthocephalus cadamba Miq.) UNTUK ADSORPSI ION LOGAM TIMBAL(II)
(Elfitra, 2023-11) Sari, Yupita Yeni Puspita; Hanifah, T. Abu
This research aims to determine the efficiency and adsorption capacity of adsorbents in adsorbing metal ions lead(II) at optimum pH optimization, optimum contact time, and concentration optimum adsorbate. White jabon bark in this study was converted into charcoal through a carbonization process with variations of temperature (400℃, 500℃, 600℃, 700℃, 800℃) and time variations of carbonization (30, 60, 90, 120 minute) for obtain the best condition of white Jabon bark charcoal which is used as lead(II) heavy metal adsorbent. Characterization of Jabon bark charcoal adsorbent white is carried out using an FTIR instrument, to analyze clusters functions that play a role in the adsorption process. Use of SEM-EDS for analyzing surface morphology and determining the elements contained therein white jabon bark powder and charcoal. The adsorbent characterization results show water content value 1.75%, ash content 13.72%, iodine adsorption capacity 519.12 mg/g and methylene blue adsorbed 64.7828 mg/g with a surface area of 240.1964 m2 /g. Adsorption The optimum occurs at a pH variation of 6, contact time of 40 minutes and initial concentration metals at 140 mgL-1 with adsorption efficiency of 99.89% respectively; 99.88%; 99.85%. FTIR results show that there is a CH bending functional group, C=C aromatic, C-N, C-H stretching aliphatic, C≡C, C=O carbonyl, and N-H groups. Results SEM-EDS shows the presence of the elements O, C, Ca, K, Mg and has a texture porous which is still covered with impurities because the activation process has not been carried out.
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SISTEM PENDUKUNG KEPUTUSAN PEMILIHAN KARYAWAN TERBAIK MENGGUNAKAN METODE PROFILE MATCHING (STUDI KASUS : LABERSA GRAND HOTEL AND CONVENTION CENTER)
(Elfitra, 2023-11) Hutahaean, Yolli; Sukamto
Employees are one of the most important assets owned by a company in its efforts to maintain survival, development, the ability to compete and earn profits. Good performance from each employee will certainly make the company benefit from the smooth running of the company. To maintain and improve the quality of each employee, one way is to carry out an assessment to select the best employees. This research aims to build a decision support system for selecting the best employees using the profile matching method with a case study of the Labersa Grand Hotel and Convention Center. This research uses three criteria, namely general, leadership and assessment over the last 6 months, each criterion has sub-criteria. The sub-criteria of the general criteria are quality of work results, quantity of work results, discipline and effectiveness as well as responsibility for work. The sub-criteria of one of the leadership criteria are problem handling and decision making, loyalty and caring, honesty, coordination and cooperation, planning and creation and accountability. The sub-criteria for the assessment criteria for the last 6 months are receiving a warning letter, being absent without permission, permission, illness and receiving a written award from the company. This decision support system produces the best employee ranking with the highest score being alternative A137 with a score of 4.87 and the lowest score being alternative A71 with a score of 3.99. This research has succeeded in building a decision support system for selecting the best employees using the profile matching method, and can help and make it easier for Labersa Grand Hotel and Convention Center in selecting the best employees.
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POTENSI BIOSORBEN KULIT SINGKONG (Manihot esculenta Crantz) TERAKTIVASI NaOH DALAM MENINGKATKAN pH DAN KUALITAS FISIK AIR GAMBUT
(Elfitra, 2023-11) Patuanjaya, Yohansen; Anita, Sofia
This research aims to analyze the effect of the cassava peel biosorbent powder activation process on the characteristics of the biosorbent powder, as well as determine the optimum contact time and optimum dose of biosorbent powder in increasing the pH and physical quality (color, odor, TSS and TDS) of peat water. The cassava peel biosorbent powder in this study was made through the process of drying the washed cassava peel, then grinding it to a size that passed at 100 mesh and was retained at 200 mesh. Biosorbent powder was activated using 0.4 N NaOH solution with a ratio of 1:10 (w/v). The functional groups of cassava peel biosorbent powder were analyzed using FTIR, while the surface morphology and elemental composition of cassava peel biosorbent powder were analyzed using SEM-EDS. Determination of the optimum contact time was carried out with variations in contact time of 30, 60 and 90 minutes. After obtaining the optimum contact time, then proceed with determining the optimum dose of biosorbent powder with a dose variation of 0.05; 0.10; and 0.15 g. Based on research, the optimum conditions for biosorbent powder after activation are a contact time of 60 minutes and a dose of 0.10 g of biosorbent powder. These optimum conditions have not been able to improve the color and odor of peat water, but have succeeded in improving pH, TSS and TDS when compared to Government Regulation No. 22 of 2021 concerning Implementation of Environmental Protection and Management.
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PENGARUH BERAT KATALIS, WAKTU DAN SUHU REAKSI PADA PRODUKSI BIODIESEL MENGGUNAKAN KATALIS HETEROGEN CaO-SiO2 3% DARI LIMBAH CANGKANG KERANG DARAH DAN SABUT KELAPA
(Elfitra, 2023-11) Risma, Yesika Ayu; Nurhayati, Nurhayati
This research aims to synthesize biodiesel using a CaO catalyst from blood cockle shells impregnated with SiO2 from coconut fiber at a concentration of 3% w/w. The resulting catalyst was characterized using the Brunauer Emmett Teller (BET) method showing that the surface area of the 3% CaO-SiO2 catalyst had a higher area compared to CaO without modification. Scanning electron microscopy-energy dispersive x-ray spectroscopy (SEMEDX) had a rough surface morphology. and agglomerate and the main elemental composition of the 3% CaO-SiO2 catalyst is Ca, Si and O, and the basicity test of the 3% CaO-SiO2 catalyst has lower basicity compared to CaO. Biodiesel production is carried out by varying catalyst weight, temperature and reaction time with optimization using the Response Surace Methodology (RSM) design. Characterization of biodiesel produced from a 3% CaO-SiO2 catalyst has water content, specific gravity, viscosity and carbon residue which generally meets the quality requirements of SNI 7182-2015, except for the acid number.