Jurnal Kimia Unand

Transpor Ion Logam Cu(II) Menggunakan Minyak Kelapa (Cocos nucifera L.) Sebagai Membran Cair Melalui Teknik Membran Cair Fasa Ruah

Refinel — 2024-11-30

Increasing industrial activities throughout the world produce a large amount of waste, including materials that contain heavy metal ions. One of the heavy metals found in industrial waste is copper ion Cu(II). Liquid membrane technology using vegetable oil as the membrane phase can be an environmentally friendly alternative metal transportation process. Transport of Cu(II) ions was carried out using bulk li-quid membrane technology using coconut oil as the phase membrane. According to the Minister of Health Regulation No. 492/menkes/per/IV/2010 concerning Drinking Water Quality Requirements, the threshold limit of Cu(II) ions in waters is 2 mg/L. Many ways have been done to separate heavy metal ions from this industrial waste. In this study, the transport of Cu(II) ions through coconut oil membrane and as the receiving phase of ethylenediaminetetraacetic (EDTA) has been carried out. The optimization results obtained, namely the source phase of Cu(II) metal ions pH 4 with a concentration of 3.147 x 10^-4 M, the receiving phase of EDTA solution pH 7 with a concentration of 0.06 M, 200 rpm stirring speed, obtained the transport of Cu(II) metal ions to the receiving phase, namely, 23.44% with a transport time of 1 hour. Furthermore, the test was carried out with the same optimum conditions using HCl as the receiving phase, and the percentage value of Cu(II) metal ions in the receiving phase was 25%, from using the EDTA receiving phase.

Profil Metabolit Sekunder, Fenolik Total, Aktivitas Antibakteri dan Antijamur Ekstrak Daun Sungkai (Peronema canescens Jack) Dari Daerah Bengkulu dan Pariaman

Norman Ferdinal - — 2024-11-30

Indonesian people have long recognized and utilized plants that have medicinal properties to overcome health problems. One of the medicinal plants that grow in Indonesia and is commonly used by the community is the Sungkai plant (Peronema canescens Jack). This Sungkai plant is spread across the island of Sumatra including Bengkulu and Pariaman regions. This study used methanol, ethyl acetate, and hexane extracts of sungkai leaves growing in Bengkulu and Pariaman areas for phytochemical screening, total phenolic content using the Folin-Ciocalteu method, and determination of antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria, as well as determination of Candida albicans antifungal activity using the well diffusion method. The results showed that sungkai leaf extract contained phenolics, flavonoids, saponins, steroids, and alkaloids. The methanol extract of sungkai leaves from Bengkulu and Pariaman had the highest total phenolic content of 175.3671 mg GAE/g sample and 227.7021 mg GAE/g sample, respectively. In the antibacterial activity test, the ethyl acetate extract of sungkai leaves from Bengkulu and Pariaman produced the largest inhibition zone with moderate criteria, namely 5.22 mm and 6.38 mm against Escherichia coli and Staphylococcus aureus obtained inhibition zones of 7.13 mm and 6.08 mm. The antifungal activity showed the largest inhibition zone in the ethyl acetate extract of sungkai leaves from Bengkulu and Pariaman regions, namely 5.22 mm and 6.40 mm, which are included in the moderate category.

Skrinning Fitokimia, Kandungan Flavonoid Total dan Uji Aktivitas Antioksidan Ekstrak Kayu Balakka (Phyllanthus emblica L.)

Dini Hariyati Adam — 2024-11-30

Balakka plant (Phyllanthus emblica L.) is a plant that has the potential to protect the pancreas, through antioxidant and anti-diabetic activities. This study aims to determine the content of metabolite compounds of balakka wood samples macerated using hexane, ethyl acetate and ethanol solvents, total flavonoid content and antioxidant activity of balakka wood extract. Total flavonoid content was determined using AlCl₃ and kursetin standard solution. This AlCl₃ method will later produce a red chelate that can be measured with a visible spectrophotometer at a wavelength of 435 nm. While antioxidant activity was measured by the DPPH method. The results showed that the highest total flavonoid content was in the ethanol extract of 60.39 mg/L and antioxidant activity with an IC₅₀ value of 28.97 ppm. Thus, the ethanol extract of balakka wood showed the highest flavonoid content and can be categorized as a very strong antioxidant.

Penggunaan Zeolit sebagai Adsorben untuk Penjernihan Air Sumur terhadap Kandungan Logam Fe, Nilai BOD, COD, dan TSS di Kelurahan Kampuang Jua Nan XX, Kecamatan Lubuk Begalung, Kota Padang

Z. Zilfa — 2024-11-30

Nobita Hill is an area that will be used as a tourist destination located in Kampung Jua Nan XX Village, at the foot of Nobita Hill, precisely in RW III, there are many houses with poor well water quality. The purpose of this study is to determine the use of zeolite (adsorbent) to purify well water based on Fe metal content parameters, BOD, COD, TSS values and also to determine the effect of adsorbent mass, sample volume, contact time and stirring time on the adsorption process. Determination of Fe content using atomic absorption spectrophotometry (AAS). Determination of the value of Biological Oxygen Demand (BOD) using the Iodometric titration method, determining the value of Chemical Oxygen Demand (COD) using the visible spectrophotometric method and determining the value of Total Suspended Solids (TSS) using the gravimetric method. Zeolite was characterized by X-Ray Fluorescence (XRF) before and after adsorption. Analysis of the concentration of Fe in well water before adsorption 2.1 mg/L. 40 mL of well water was adsorbed with 0.1 g of zeolite for 45 minutes at a stirring speed of 200 rpm, Fe decreased by 96.1%, from 2.1 mg/L to 0.1 mg/L. COD, BOD and TSS values also decreased 57.1%, 63.9% and 67.5% respectively. Characterization using XRF showed a decrease in Si and Al content and an increase in Fe metal content in the adsorbent after adsorption.

Degradation of Remazol Yellow FG by Sonolysis and Photolysis with TiO2/Active Carbon Rice Husk (TiO2/AC) Catalyst and Analysis Using Spectrophotometer UV-Vis

Safni — 2024-11-30

Remazol Yellow FG is one of the dyes that are often used in the textile industry because it is accessible and reasonably priced. The non-biodegradable dyes produce waste and inhibit sunlight from passing through the water. In this study, we performed Fourier Transform Infrared (FTIR) to characterise the activated carbon of rice husk and TiO₂/activated carbon rice husk (TiO₂/AC) using Diffuse Reflectance Spectroscopy UV-Vis (DRS UV-Vis). Remazol Yellow FG was degraded by using sonolysis and photolysis under UV ray (λ = 254 and 365 nm) and visible ray. We performed the experiments using a variety of variables which consist of catalyst dosage (10–50 mg), contact time (1–6 hours), catalyst type (AC, TiO₂ and TiO₂/AC), lamp type (365 nm, 254 nm and visible lamp) and initial Remazol Yellow FG concentration (10–30 mg/L) to determine the degradation percentage. We found that the addition of TiO₂/AC catalyst increased the degradation percentage of Remazol Yellow FG from 6,86% to 52,62% using sonolysis and 8,34% to 95,02% using photolysis. Hence, we concluded that TiO₂/AC catalyst from rice husk could be an effective catalyst for the Remazol Yellow FG degradation.