Liquid Soap Production from Catfish (Pangasius hypophthalmus) Fat Waste

Catfish (Pangasius hypophthalmus) fat is a waste that has not been used optimally, especially in the use of soap. This study aimed to determine the effect of operating conditions are temperature, reaction time, and the ratio of volume between catfish oil and KOH. Soap can be formed by saponification reaction with strong alkali by hydrolyzing catfish oil with variations in the volume ratio of reactants (1:2, 1:3 and 1:4), temperature (75 °C and 95 °C) and reaction time (45 minutes and 75 minutes) with a constant stirring speed of 300 rpm. In the variation of the volume ratio of reactants, temperature and reaction time carried out in this study, a good liquid soap obtained is the volume ratio of reactants 1:3, temperature 75 °C and reaction time 45 minutes with pH 9.3 and free fatty acid 2.27%. The soap products produced have met SNI No. 06-4085-1996

Climate Change Analysis (Monthly Rainfall) on Palembang Duku Production (Lansium domesticum Corr)

Climate is one of the conditions needed by plants to increase production. Climate change, especially on rainfall has a significant effect on agriculture because it has a strong dependence on the climate element. Rainfall is one of the climate factors that play a role in supporting the availability of water. Conditions in areas with high rainfall intensity can cause the loss of flowers and fruit, and if there is a long dry season it will affect flowering on plants. This study aimed to determine the effect of rainfall on L. domesticum production for 10 years (2010-2019). The study was conducted in OKU and OKI Regencies. The analytical method used is multiple linear analysis and correlation analysis. From multiple linear analysis and correlation analysis results, there was a fluctuation in the intensity of rainfall for 10 years (2010-2019). Based on the regression analysis, rainfall in June for OKU Regency had a significant effect on L. domesticum production while for OKI Regency the significance occurred in December

Bioethanol Production from Chlorella Pyrenoidosa by Using Enzymatic Hydrolysis and Fermentation Method

Starch can be found in microalgae, the raw material for the third generation of bioethanol production. One of them is C. pyrenoidosa. This study was conducted to analyze the efect o α-amylase enzyme concentration on the glucose contents produced and the efects o ermentation time on bioethanol contents produced. The hydrolysis process o this study was conducted using an α-amylase enzyme produced by A. niger. Several analyses in this research were carried out, including the analysis of enzyme activity using the Fuwa method, the analysis of glucose levels from enzymatic hydrolysis using the DNS method, and the analysis of bioethanol contents using the density method and GC-MS. The highest glucose content was 0.67 mg/mL, which was obtained from the addition o 40% (v/w) α-amylase enzyme, and the yield o bioethanol content rom the sample treated 40% (v/w) α-amylase enzyme and fermented for 9 days was the optimum, which produced 28.07% of bioethanol content

Synthesis of Epoxide as Intermediate Compounds for Biolubricant Production from Crude Palm Oil

The use of biolubricant must be encouraged to reduce environmental pollution from non-biodegradable lubricants by utilizing crude palm oil. This study aims to synthesize epoxide compounds from crude palm oil (CPO) as intermediate compounds to produce Biolubricant and determine the kinetic reaction and the enthalpy of the epoxide reaction. The process of synthesizing epoxide was carried out in a stirred reactor. The epoxidation reaction occurred at 60, 70, and 80 °C for 30 – 180 min with 30 min intervals using 1, 2, and 3% H2SO4 as catalysts. The highest conversion was obtained at a reaction temperature of 70 °C at 90 min using 2% H2SO4 of 87.59%. The characteristics of the epoxide compound produced have a density of 0.951 g/cm3, a kinematic viscosity of 44.388 CSt, an acid number of 4.32 mg NaOH/g oil, and oxirane number of 5.731 g/cm3. The reaction kinetic constant and enthalpy were 0.0104 mol/mL min and 10494.762 J/mol. The synthesized epoxide from crude palm oil was proven to be a suitable intermediate compound for biolubricant production

Synthesis of NiFe2O4/SiO2/NiO Magnetic and Application for the Photocatalytic Degradation of Methyl Orange Dye under UV Irradiation

NiFe2O4/SiO2/NiO magnetic was successfully synthesized using NiFe2O4, SiO2, and NiO as the core, interlayer, and shell, respectively. NiFe2O4/SiO2/NiO under UV light irradiation was used for photocatalytic degradation of methyl orange dye with different pH, catalyst dose, and initial dye concentration. This composite was characterized by X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy-Electron Dispersive X-ray Spectroscopy (SEM-EDs), Vibrating Sample Magnetometer (VSM), UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS), and Point of Zero Charge (pHpzc). The results showed that the composite is a superparamagnetic material with a saturation magnetization value of 44.13 emu/g. It also has a band gap of 2.67 eV with a pHpzc of 6.33. The optimum conditions for photocatalytic degradation were at pH of 4; 0.50 g/L catalyst dose, and 10 mg/L initial concentration. NiFe2O4/SiO2/NiO degradation efficiency to methyl orange dye was 95.76%. The photocatalytic degradation in different concentrations follows the pseudo-first-order, where the greater the concentration, the smaller the constant rate (k). After five cycles of repeated usage, NiFe2O4/SiO2/NiO has good catalytic performance as well as efficient and favourable of a recyclable photocatalyst. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Pelatihan Penulisan dan Publikasi Artikel Ilmiah Di Jurnal Nasional Terakreditasi dan Internasional Bereputasi bagi Dosen Fakultas Teknik Universitas PGRI Palembang

Pelatihan penulisan dan publikasi artikel ilmiah sebagai bentuk pengabdian untuk meningkatkan wawasan dan kemampuan dosen Fakultas Teknik (FT) Universitas PGRI Palembang (UPGRIP) telah berhasil dilaksanakan. Kegiatan ini dilakukan dengan metode ceramah langsung, pendampingan dan bedah manuskrip perwakilan dari masing-masing program studi di FT UPGRIP. Dari hasil pelatihan, pertambahan pemahaman mengenai penyusunan manuskrip, proses submit hingga cara merespon reviewer telah dirasakan oleh peserta. Tercapainya tujuan pelatihan diamati dari pre dan post-test pada peserta. Rata-rata peserta telah memahami proses penulisan dan publikasi artikel ilmiah adalah 50-75%. Pelaksanaan pelatihan berkelanjutan diperlukan untuk meningkatkan efektivitas pelatihan

Bioethanol production from coconut husk using DES-NADES pretreatment and enzymatic hydrolysis method

Bioethanol is an alternative fuel produced during biomass fermentation. Among the available biomass resources for bioethanol production, coconut husk is an interesting raw material due to its high cellulose content. This study aims to evaluate the coconut husk conversion into bioethanol using DES (ChCl:MEA) and NADES (Be:La) solvents for the delignication process. The molar ratios of HBA and HBD of the two solvents were varied (1:4, 1:6, 1:8) at 2, 4, 6, and 8 h for each ratio. The deligni- ed samples were hydrolyzed using the 5% (w/w) of cellulase enzymes and fermented for seven days using Saccharomyces cerevisiae. The results showed that DES (ChCl:MEA) and NADES (Be:La) could remove lignin at about 60.53% and 65.81%. The glucose content was obtained at 0.5% (brix) by both solvents and bioethanol content was obtained at 13.9% and 14% (v/v) for DES and NADES, respectively

Bioethanol Production from Chlorella Pyrenoidosa by Using Enzymatic Hydrolysis and Fermentation Method

Starch can be found in microalgae, the raw material for the third generation of bioethanol production. One of them is C. pyrenoidosa. This study was conducted to analyze the effect of α-amylase enzyme concentration on the glucose contents produced and the effects of fermentation time on bioethanol contents produced. The hydrolysis process of this study was conducted using an α-amylase enzyme produced by A. niger. Several analyses in this research were carried out, including the analysis of enzyme activity using the Fuwa method, the analysis of glucose levels from enzymatic hydrolysis using the DNS method, and the analysis of bioethanol contents using the density method and GC-MS. The highest glucose content was 0.67 mg/mL, which was obtained from the addition of 40% (v/w) α-amylase enzyme, and the yield of bioethanol content from the sample treated 40% (v/w) α-amylase enzyme and fermented for 9 days was the optimum, which produced 28.07% of bioethanol content