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SINTESIS DAN KARAKTERISASI KATALIS CaO-SiO2 DARI CANGKANG KERANG DARAH DAN SABUT PINANG UNTUK PRODUKSI BIODIESEL
(Elfitra, 2023-12) Marlinda, Ririn
Calcium oxide (CaO) is a catalyst that is widely used for biodiesel synthesis reactions
because it has relatively high base strength, but the CaO catalyst has the weakness of a low
surface area. Therefore, to increase biodiesel yield the CaO catalyst needs to be modified
using silica to increase the surface area of the catalyst and its catalytic activity. The aim of
this research is to synthesize and characterize the CaO catalyst modified by SiO2 areca palm
ash using the impregnation method with the SiO2 ratio of 3% w/w to the weight of CaO. The
resulting catalyst was applied for biodiesel production with yield optimization using a
Response Surface Methodology (RSM) design. Analysis using BET shows that the surface
area of CaO-SiO2 has increased. XRF analysis for the 3% CaO-SiO2 catalyst obtained a SiO2
composition of 0.66 and a CaO composition of 97.496%. Based on the optimum results, the
highest biodiesel yield was 94.29%.
SINTESIS NANOPARTIKEL PERAK MENGGUNAKAN EKSTRAK DAUN JABON PUTIH (Anthocephalus cadamba Miq.)
(Elfitra, 2023-12) Nainggolan, Rezky Yoshua
Biosynthesis is one of the synthesis methods that used plants as reductor. The
secondary metabolite compund in plants can be used as bioreductor fo synthesize
silver nanoparticles. The purpose of this research was to synthesize silver
nanoparticles using jabon putih leaf extract (Anthocephalus cadamba Miq.) using
biosynthesis method. The extract was obtained from maseration method by
mixing 5 g jabon putih leaves with 250 mL Aqua demineralized. After that, silver
nanoparticles was synthesized with biosynthesis method that accompanied with
variation of pH and AgNO3 solution’s concetration. The pH was variated in 3, 5,
7, 9, and 11 and AgNO3 solution’s concetration was variated in 0.1 mM, 1 mM,
and 10 mM. the formed silver nanoparticles were analyzed using UV-Vis
Spectrophotometry and Fourier Transform Infra Red (FTIR). The result of this
research are showed in UV-Vis and FTIR’s Spectra. UV-Vis spectra analysis
showed the existence of an optimum stable absorbance peak at wavelength of 431
nm with the absorbance of 1.331. This result was further supported by FTIR
spectra, which shows the presence of the O-H group, a functional group that
reduce Ag+ ions into Ag0. The best conditions to synthesize silver nanoparticles in
this research were found to be at pH 3 with a concentration of AgNO3 solution of
1 mM.
AKTIVITAS ANTIDEPRESAN EKSTRAK n-HEKSANA BIJI PINANG TUA DENGAN METODA FORCED SWIM TEST PADA MENCIT JANTAN (Mus musculus)
(Elfitra, 2023-12) Rahayu
Depression is a mental health disorder characterized by unstable mood and frequent
emotional changes. Antidepressant drugs can be used as initial pharmacological
therapy for depressive disorders. The Forced Swim Test (FST) method is a method
used to see antidepressant activity. This study aims to determine the antidepressant
activity of n-hexane extract of mature areca nut seeds using the FST method acutely.
FST was used because it is one of the most widely used in vivo methods for
detecting antidepressant drugs in test animals. The injection into mice was carried
out intraperitoneally 1 hour before FST at a dose of 10 mg/kg and the control group
was only injected with 0.9% saline. N-hexane extract of old areca nut seeds at a
dose of 10 mg/kg was not effective as an antidepressant because there was no
significant reduction in immobility time compared to controls.
PENGARUH PENAMBAHAN KARBON NANOTUBE PADA DENSITAS KARBON AKTIF BERBASIS KULIT BIJI MAHONI
(Elfitra, 2023-12) Sitinjak, Polikarpus Ebenezer
The influence of adding Carbon Nanotube (CNT) on the density of activated carbon
derived from mahogany seed husk. Various additions of CNT, namely 2%, 4%, and
8%, were applied during the synthesis of activated carbon to assess their impact on the
material density. The characterization process involved measuring the thickness,
diameter, and weight of the activated carbon before and after pyrolysis. The results of
the analysis indicate that the addition of CNT significantly affects the density of
activated carbon, with the highest reduction value reaching 41.20%. The incorporation
of CNT at certain levels can lead to measurable changes in the material density
characteristics.
SINTESIS KOMPOSIT MnOx/ABU CANGKANG KELAPA SAWIT UNTUK DEGRADASI METILEN BIRU: VARIASI SUHU KALSINASI
(Elfitra, 2024-12) Sibarani, Panji Haratua; Awaluddin, Amir
Manganese oxide is an important compound in nature for the transformation of various
compounds into simpler compounds. Synthesis of manganese oxide can be carried out
using the sol-gel method. The aim of this research is to examine the effect of calcination
temperature on the characteristics and catalytic activity of MnOx/ACKS composites.
The synthesis of the MnOx/ACKS composite was carried out by mixing KMnO4,
glucose and activated ACKS. The MnOx/ACKS composite was characterized using XRay
Diffraction (XRD). The XRD characterization results show that the MnOx/ACKS
composite consists of a quartz phase and a mixed phase of manganese oxide such as
managanosite, cryptomelane, hausmanite and binnerssite. Degradation of methylene
blue at a concentration of 12.5 ppm, a volume of 5 mL of H2O2 and a composite mass of
25 mg was able to degrade methylene blue by 86.67% within 120 minutes.