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INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Chemistry
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Articles 502 Documents
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SYNTHESIS AND CHARACTERIZATION OF GRAPHENE OXIDE USING LIQUID PHASE EXFOLIATION (LPE) DAN HUMMER’S METHOD: MINI REVIEW Duratulhikmah, Nur Fadhilah; Hindryawati, Noor; Syaima, Husna
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Graphene oxide (GO) is a 2D material that has various oxygen functional groups on its surface and edges. The existence of these clusters makes GO have enormous potential to be applied in various fields. Currently various methods have been developed to synthesize these materials including Liquid Phase Exfoliation (LPE) and Hummer's. This review will present the synthesis of Graphene oxide along with the results of its characterization using Fourier Transform Infra Red (FTIR), Raman Spectroscopy, and UV-Vis spectrophotometer. Literature results show that in FTIR the typical functional groups that will appear are the O-H, C=O, and C-O epoxy groups, on Raman spectroscopy it shows peaks of 1300-1400 cm-1 (D-band) and peaks of 1500-1600 cm-1 (G -band) and there is a maximum absorption peak value at a wavelength of 200-235 nm from the results of UV-Vis characterization Keywords: Graphene Oxide, Hummer’s, Liquid Phase Exfoliation, Raman Spectroscopy
REVIEW ARTIKEL: PENAPISAN FITOKIMIA DAN POTENSI AKTIVITAS BIOLOGIS TANAMAN BAJAKAH (Uncaria cordata (Lour.) Merr.) Farhany, Farhany; Saleh, Chairul; Daniel, Daniel
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Bajakah (Uncaria cordata (Lour.) Merr.) is an endemic plant to Kalimantan which is widely used as medicine. Various studies have been conducted regarding the phytochemical content and biological activity of Bajakah. Phytochemical screening was carried out for the content of alkaloids, flavonoids, polyphenols, triterpenoids, steroids, saponins, and tannins. Literature studies show that Bajakah has antioxidant activity within ethanol fraction with a very strong capacity as indicated by an IC50 value of 49.22 ppm, within the nhexane fraction with a medium capacity as indicated by an IC50 value of 108.22 ppm, and within ethyl acetate fraction with a medium capacity as indicated by an IC50 value of 130.30 ppm. Bajakah is also known to have antihyperuricemia activity by reducing uric acid levels at extract doses of 5.3 mg/30gBW, 10.6 mg/30gBW, and 21.2 mg/30gBW. Anticholesterol activity was indicated by reducing cholesterol levels at extract doses of 5.3 mg/30grW (11.45%), 10.2 mg/30grW (12.89%), and 21.2 mg/30grW (21.05%). Antiinflammatory activity was showed by testing the ethyl acetate extract of Bajakah stem at doses of 200 and 400 mg/kgBW. The acute toxicity test showed an LD50 value of >5000 mg/kgBW; indicating that the butanol fraction of Bajakah is relatively harmless and has potential as a standardized herbal medicine (OHT). Keywords : Uncaria cordata (Lour.) Merr.), phytochemical screening, bioassay
REVIEW ARTICLE: UTILIZATION OF VARIOUS OF ADSORBENT FROM ACTIVATED CHARCOAL IN INCREASING THE QUALITY OF COOKING OIL Hasriani, Hasriani; Sitorus, Saibun; Hiyahara, Irfan Ashari
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Cooking oil is a type of vegetable oil derived from palm plants that has gone through various refining processes. Generally, cooking oil is used repeatedly at high temperatures until the oil is unfit for consumption This results in a decrease in the quality and nutritional value of fried food. In addition, the accumulation of used cooking oil (used cooking oil) can cause environmental pollution. Improving the quality and nutritional value of cooking oil can be done by using the adsorption method. The adsorption method is a method that is carried out by using a number of adsorbents from activated charcoal in the process of refining used cooking oil. Adsorbents from activated charcoal can be made from basic ingredients of agricultural waste such as activated charcoal from coconut shells, corn cobs, snack fruit and others. The adsorbent of activated charcoal can reduce the levels of fatty acids, water content, peroxide levels and acid numbers. The internal adsorption capacity depends on the different adsorbent types, contact time, amount of adsorbent, surface area and structure of the adsorbent and adsorbate concentration. Keywords: Adsorbent, Activated Charcoal, Adsorption Capacity, Used Cooking Oil
POTENTIAL OF COW’S BLOOD AS A MOTORIZED VEHICLE EXHAUST EMISSION REDUCTION Wulanawati, Armi; Sari, Silvia Mekar; Fachrurrazie, Fachrurrazie
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Motorized vehicle is a means of transportation needed to support various human activities. But on the other hand, this tool is the biggest contributor (85%) to the problem of air pollution that occurs in Indonesia. This is due to motorized vehicle exhaust emissions producing various kinds of pollutants, including hydrocarbon compounds (HC), carbon monoxide (CO), and nitrogen oxides (NOx) which are dangerous and toxic gases, and carbon dioxide (CO2) as a factor in global warming. Hazardous exhaust emissions are formed due to incomplete combustion in the working process of the motor due to a lack of oxygen gas supply. Therefore, it is necessary to find a way to overcome this impact, among others by adding additives that have a high oxygen content to the fuel. The oxygen source can be found abundantly in the blood because it contains hemoglobin, rich in oxygen. Be discovered, cow's blood from animal slaughter waste if it is directly disposed of without processing can also cause environmental pollution. Thus, this research was carried out by synthesizing additives from cow’s red blood cells mixed with methanol at a concentration of 0.1% (w/v) using a maceration time of 3 h. The use of these additives in motorized vehicle fuels resulted in reduced emissions of HC, CO, NOx, and CO2 respectively by 65.96%; 71.43%; 66.67%; and 36.15%. Keywords: cow's blood, exhaust emissions, motorized vehicles, air pollution
Keynote Speaker Widodo, Nanang Tri
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

SEMINAR NASIONAL KIMIA 2023 Keberlanjutan Riset Kimia Berbasis Tropical Studies dan Aplikasinya Guna Mendukung Pembangunan Ibukota Negara Baru Keynote Speakers: Prof. Dr. Ir. Erwin, M.Si (Universitas Mulawarman) Dr. rer. nat. Chaidir, Apt. (Badan Riset dan Inovasi Nasional) Dr. rer. nat. Fifi Fitriyah Masduki, M.Sc (Perhimpunan Biokimia dan Biologi Molekular Indonesia) Hanggara Sudrajat, Ph.D (Badan Riset dan Inovasi Nasional; Institute of Physical Chemistry, Polish Academy of Sciences)
SYNTHESIS AND CHARACTERIZATION OF ZnO NANOPARTICLES: MINI REVIEW Wulandari, Siti Aprilia; Hindryawati, Noor; Ashari, Irfan
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

This mini review will explore the manufacture of ZnO nanomaterials. ZnO material has the advantages of high electron mobility, wide bandgap, high temperature resistance, and good UV absorption. ZnO has many applications in everyday life such as for photocatalysts, antibacterials, edible coatings, and others. Based on the literature review, ZnO material can be synthesized using sol-gel, hydrothermal, solvothermal, precipitation and coprecipitation methods. The resulting synthesis results are 7.4 nm-170 nm in size, have a hexagonal wurtzite crystal structure, have a bandgap of 3.23 eV-3.50 eV, and produce a surface area of 91.87 m2/g-113.37 m2/g. Based on the review conducted, it can be concluded that the method that produces ZnO nanoparticles with the smallest size and the largest surface area is synthesis using the solvothermal method. Keywords: Nano materials, Semiconductors, Nanoparticles.
PENYERAPAN LOGAM BERAT SECARA BIOKIMIAWI OLEH BAKTERI GRAM POSITIF DAN GRAM NEGATIF: A MINI RIVIEW Mahrus, Muhammad Haissul; Kartika, Rudi; Fahmi, Miraz’ul; Dimas P, Riansyah; Rahman, Fathur; Aswat, Raihan; Rizkirullah, M. Adhitya
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Dyes are one source of heavy metal waste originating from the textile industry, this is caused by the manufacture of dyes that use heavy metals as catalysts. Heavy metals are very dangerous because they cannot be broken down or degraded. Wastewater produced from the textile industry can contain dangerous metals, namely chromium (Cr), copper (Cu) and lead (Pb), where if these metals enter water bodies they can damage the food chain. Therefore, an alternative method is used that can reduce this waste, namely the biosorption method using microorganisms in the form of bacteria. This research uses gram positive bacteria in the form of Streptococcus mutans bacteria which will be exposed to chromium (VI) metal and gram negative bacteria in the form of Flavobacterium sp bacteria which will be exposed to lead (Pb) metal and Pseudomonas sp bacteria which will be exposed to chromium (VI) metal, lead. (Pb), and copper (Cu). The aim of this research was to determine the absorption ability of negative and gram-positive salt bacteria on these heavy metals. Literature results show that Streptococcus mutans bacteria are able to absorb chromium (VI) metal with a maximum of 90.80% with a concentration of 5 ppm on the 5th day. Flavobacterium sp bacteria are able to absorb lead metal (Pb) with a maximum of 96% with a concentration of 2 ppm on the 18th day, while Pseudomonas sp bacteria are able to absorb chromium (VI) metal with a maximum of up to 96.192% with a concentration of 5 ppm on the second day. -14, lead(Pb) metal can be absorbed to a maximum of 36.874% with a concentration of 4 ppm on the 16th day and Cu(II) metal can be absorbed to a maximum of 84.447% with a concentration of 3 ppm on the 16th day. Keywords: Biosorption, Bacteria, Metal
LITERATURE REVIEW: ANALYSIS OF WEAKNESS AND INHIBITING FACTORS IN THE IMPLEMENTATION OF THE MERDEKA CURRICULUM Akbar, Muhammad; Putri, Noni Khaisha; Febriani, Sarah; Abunoya, Juleha Ilfri; Sukemi, Sukemi
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

The Merdeka Curriculum issued by the Ministry of Education, Culture, Research and Technology is expected to be a program that is able to overcome educational problems due to the Covid-19 Pandemic. This curriculum offers three functions, namely project-based learning characterized by the Pancasila Student Profile, study of subject matter and a more flexible curriculum structure. An application of the curriculum has weaknesses and inhibiting factors. This literacy study was conducted to examine the weaknesses and inhibiting factors in implementing the Merdeka Curriculum. The method used is a narrative literature review with a literature search using keywords in the range of 2019 to March 2023 and 30 relevant articles were found. Weaknesses and inhibiting factors found in the implementation of the Merdeka Curriculum, namely teacher unpreparedness, lack of training related to the Merdeka Curriculum, lack of facilities and infrastructure, and a less than optimal learning system. The results of this literature review indicate that it is necessary to analyze and evaluate the Merdeka Curriculum so that solutions are found and actions that can overcome weaknesses and inhibiting factors that ultimately it is hoped that the implementation of the Merdeka Curriculum can run well. Keywords: Pancasila Student Profile, Merdeka Curriculm, Inhibiting factor
MINI REVIEW: FOTOKATALISIS NANOPARTIKEL CaO TERHADAP ZAT WARNA ORGANIK SINTETIK Salsabila, Aidilia Putri; Hiyahara, Irfan Ashari; Syaima, Husna
PROSIDING SEMINAR KIMIA Vol 2 No 2 (2024): Prosiding SNKT III 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Nanoparticles of CaO (CaO-NP) are currently a frequently used material in research due to their excellent catalytic and antibacterial activities, low toxicity, abundant availability, and relatively affordable manufacturing cost. One of their applications is as a photocatalyst, commonly employed to degrade organic materials such as dyes. This review discusses the utilization of CaO nanoparticles as photocatalysts for both cationic and anionic organic dyes. Literature results indicate that CaO-NP can serve as a catalyst in the photocatalysis of dyes, whether they are cationic or anionic. The percentage of degradation achieved varies, ranging from as low as 60% to as high as 99.21%. These varying results are attributed to the different parameters used in the diverse photocatalysis processes. Keywords: CaO Nanoparticle, Organic Dye, Photocatalysis
SYNTHESIS AND SWELLING PROPERTIES OF CHITOSAN-BASED HYDROGELS CROSSLINKED FORMALDEHYDE AND TRIPOLYPHOSPHATE Ramadhani, Fadilah; Pasaribu, Subur P.; Panggabean, Aman Sentosa
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Hydrogel is a hydrophilic polymer network that can experience swelling with the ability to absorb and retain large amounts of liquid without decomposing and is widely applied in the fields of health, environment and agriculture. The swelling properties of hydrogels are influenced by the type of tissue and the density of crosslinks that form it. In this study the hydrogel was prepared by stirring a 2% chitosan solution (w/v) as much as 7 mL with 3 ml of formaldehyde-tripolyphosphate crosslinking mixture at variations of 3:0, 2:1, 1:1, 1:2 and 0:3 (v/v) at room temperature and swelling tests were carried out by immersing each hydrogel produced in aquades for a span of 24 hours at the same temperature. Based on the observations, the gel formation time was 420, 97, 84, 75 and 58 minutes respectively which showed the lower the chitosan concentration and the higher the tripolyphosphate, the faster the gel formation process. Then the degree of consecutive sweling was 581.43; 78,23; 75,17; 48.85 and 20.97% (w/w) indicate that covalent cross-networks formed by amine groups on chitosan with aldehyde groups on formaldehyde are more stable and more difficult to degrade than physical cross-networks formed by groups on chitosan and tripolyphosphates. Keywords: Hydrogel, Crosslinking, Chitosan-tripolyphosphate, Degree of swelling.

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