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Unesa Journal of Chemistry

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Published by Universitas Negeri Surabaya

ISSN : - EISSN : 22528180 DOI : https://doi.org/10.26740/ujc.v11n2

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology

UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.

Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)

Articles 103 Documents

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PENGARUH JUMLAH POROGEN PADA SINTESIS MIP (MOLECULARLY IMPRINTED POLYMER) TERHADAP ADSORPSI MIP-KLORAMFENIKOL Maria Monica Sianita; Trifena Meysia Yusuf
Unesa Journal of Chemistry Vol 11 No 1 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

The purpose of this study was to determine the effect of porogen acetonitrile volume during the synthesis of Molecularly Imprinted Polymer (MIP) toward the adsorption capability of chloramphenicol and to determine the characteristics of the functional groups contained in Non Imprinted Polymer (NIP) and MIP. The porogen variations used were 30 mL, 45 mL, dan 60 mL. The effect of volume of porogen to adsorption capability will be measured using High Performance Liquid Chromatography (HPLC) instruments, while the functional groups on NIP and MIP will be characterized using Fourier Transform Infra Red (FTIR). MIP was synthesized using the precipitation method. The results showed that the 60 mL of the porogen variation gave the highest adsorption capability value compared to other variation which was 7.32 mg/g. Characterization with FTIR showed that the presence of NO2 group in NIP which was indicated at wave number 1517.56 cm-1 and 1549,08 cm-1 while in MIP the NO2 group was detected at wave number 1553.07 cm-1 with lower intensity. Key words: MIP, chloramphenicol, acetonitrile, adsorption capability.

SIFAT MEKANIK FILM KITOSAN/PVA DENGAN ZEOLIT TERSUBSTITUSI PERAK SEBAGAI KEMASAN AKTIF Dina Kartika Maharani; Weka Firda Rizki Nurzulla
Unesa Journal of Chemistry Vol 11 No 1 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

The discussion about adding silver-substituted zeolite on the composite chitosan/PVA has been done with the percentage of silver-substituted zeolite (0,025;0,05;0,1; and 0,2(%w/v)). The ion exchanged between zeolite and silver by immersion method, which is ions Ag+ will doped on to zeolite replace the ions Na+. The Chitosan/PVA films have been obtained are characterized using FTIR and SEM and tested for mechanical properties using Autograph Microcomputer Control Universal Testing. The obtained data indicated that adding zeolite doped with silver increase the mechanical properties of a film. The best mechanical properties showed on addition zeolite/Ag 0,2 (% w/v) with tensile strength 32,733 MPa, elongation at break 42,8%, and modulus young 0,765 Mpa. Functional group identification result by FTIR showed a shift in the O-H and N-H vibration to a lower frequency caused by the addition of zeolite/Ag to the film. Morphological characterization using SEM showed that there are differences on surface morphology between chitosan/PVA before and after the addition of silver-substituted zeolite, Scanning Electron Microscope (SEM) results show there is small particles due to the presence of Zeolit/Ag. Key words: Chitosan, Zeolite, Silver, Mechanical Properties

Preparasi dan Karakterisasi Komposit Kitosan-ZnO sebagai Agen Hidrofobik pada Kain Katun Dina Kartika Maharani; Kayla Naulia Fadhila
Unesa Journal of Chemistry Vol 11 No 1 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

This study aims to make a composite material from chitosan and ZnO as well as its application as a hydrophobic agent for cotton fabrics through a chitosan-ZnO composite coating process on cotton fabrics. The manufacture of chitosan-ZnO composites used the sol-gel method with variations in the volume ratio of chitosan to ZnO, namely 7:3, 6:4, 5:5, 4:6 and 3:7. The hydrophobicity of cotton cloth coated with chitosan-ZnO composite was measured using the water contact angle (WCA) method and the highest water contact angle was 131º for the variation of chitosan: ZnO of 7:3. Characterization of chitosan-ZnO composites using FTIR and XRD instruments The FTIR results show an interaction of chitosan with ZnO, this is supported by the presence of C=O groups observed at wave numbers 1556 cm-1, C-N groups appear at 1397 cm-1 and 1338 cm-1, –OH and –NH groups are detected at 3242 cm-1, O-Zn-O bonds were identified at 425 cm-1 and also –C-O-C- bonds between the chitosan group and ZnO were seen at 1019 cm-1 and 1052 cm-1. XRD results showed peaks at 2θ 37.1º, 246.82º and 68.31º indicating the presence of a ZnO nanoparticle crystalline phase and characteristic peaks of chitosan at 2θ 10.6º and 2θ 21.8º. The results of FTIR and XRD characterization show that the chitosan-ZnO composite has been successfully synthesized. Key words: Hydrophobic, Chitosan-ZnO Composites

Pengaruh Penambahan SiO2 dan TiO2 terhadap Sifat Hidrofobik Komposit Kitosan- ZnO Pada Kain Dina Kartika Maharani; Nur Lailiyah
Unesa Journal of Chemistry Vol 11 No 1 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

This study purposed to determine the effect of adding TiO2 sol and SiO2 sol to chitosan-ZnO composites on the hydrophobic properties of fabrics through the fabric coating process. The data obtained of consisted qualitative and quantitative data. Data analysis used qualitative descriptive manner. The addition of TiO2 and SiO2 to Chitosan-ZnO using the sol-gel method. Composite coating on the fabric using the dip-coating method with a volume ratio of TiO2:ZnO 1:1 and SiO2:ZnO 1:1. Hydrophobicity test using the WCA method obtained contact angle of the chitosan-ZnO is 101o, chitosan-TiO2/ZnO is 142o and chitosan-SiO2/ZnO is 127o, then characterized using FTIR, showed the interaction of chitosan and ZnO marked by a peak in the area of 430 cm-1; 1556 cm-1; 1397 cm-1; 1338 cm-1; 3242 cm-1; 1052 cm-1 and 1019 cm-1. The formation of Chitosan-ZnO/TiO2 was seen from the wave shift and changes in the absorption intensity of Chitosan-ZnO at peak of 3242 cm-1 to 3450 cm-1; 1556 cm-1 to 1548 cm-1; 1397 and 1338 cm- 1 became 1400 and 1336 cm-1; 1052 and 1019 cm-1 became 1151 and 1023 cm-1 and a new peak appeared at 850 cm-1. The formation of Chitosan-ZnO/SiO2 was seen from the wave shift and changes in the absorption intensity of Chitosan-ZnO at peak of 3242 cm-1 to 3257 cm-1; 1556 cm-1 to 1589.34 cm-1; 1397 and 1338 cm-1 becomes 1401 and 1342 cm-1; 1052 and 1019 cm-1 becomes 1066 and 1020 cm-1 also new peaks of 938 cm-1. Keywords: Chitosan-ZnO Composite, TiO2, SiO2, Hydrophobic

ARTIKEL REVIEW: PEMANFAATAN KATALIS ABU CANGKANG PADA REAKSI TRANSESTERIFIKASI MINYAK JELANTAH MENJADI BIODIESEL Ervina Retnaningtyas Indarwati; Samik Samik
Unesa Journal of Chemistry Vol 11 No 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

This review article about the use of a catalyst derived from shell ash in the transesterification reaction of used cooking oil into biodiesel. The preparation of this article was carried out using a literature study by reviewing research articles. Biodiesel is a subtitute for reneable fuels, environmentally friendly and can replace diesel. Biodiesel is generally produced using a transesterification reaction is slow so that a catalyst is needed that can speed up the reaction. CaO catalyst can be obtained from shell ash that has been calcined at the certain temperature which can produce metal oxides. The highest metal oxide content in shell ash is CaO in the range of 81,09% to 93,16% using a calcination temperature in the range of 700oC to 900oC. Used cooking oil is cooking oil that has been used in the frying process for many times and has been damaged due to hydrolysis, oxidation, and polymerization processes. Based on the results of the literature study, it can be seen that the CaO catalyst from egg shell ash, snail shells and blood clam shell produced. The higest %yield biodiesel in the transesterification reaction of used cooking oil, which was 99,738% which came from egg shell ash. These result are influenced between alcohol and oil ratio of 12 : 1, the amount of 7% CaO catalyst, and transesterification reaction temperature of 70oC.

REVIEW: PEMBUATAN BIODIESEL DENGAN METODE TRANSESTERIFIKASI MENGGUNAKAN KATALIS BERBAHAN LIMBAH TULANG M. Iqbal Al Ghifari; Samik Samik
Unesa Journal of Chemistry Vol 12 No 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Among various renewable energy sources, biodiesel is a promising candidate to replace fossil fuels. Biodiesel is produced from the transesterification reaction of oil or fat with alcohol. The transesterification reaction requires a suitable catalyst. There are two kinds of catalysts, namely homogeneous and heterogeneous catalysts. Heterogeneous catalysts have several advantages, including being easy to separate and can be reused without going through many processes. Currently, many natural materials are used as raw material for heterogeneous catalysts, such us bone. In this article, we will discuss the manufacture of biodiesel with a catalyst from various bone waste such as cow, goat, sheep, chicken, fish and ostrich bones. Based on the results of a review of several articles, it was known that the catalyst from bone which has the highest biodiesel yield comes from fish bone which is calcined at a temperature of 997.42 oC for 2 hours, the catalyst can produce a biodiesel yield of 97.73%. With the reaction conditions: ratio of moles of oil : methanol of 1 : 6.27, weight of the catalyst 1.01% of the mass of oil with a reaction that lasted for 5 hours at a temperature of 70 oC. Key words: biodiesel, transesterification, catalyst, waste bone

ARTIKEL REVIEW: PEMANFAATAN KATALIS ZEOLIT ALAM TERAKTIVASI DALAM SINTESIS BIODIESEL DENGAN METODE ESTERIFIKASI DAN TRANSESTERIFIKASI Siti Novita Sari Ulfa; Samik Samik
Unesa Journal of Chemistry Vol 11 No 3 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

The depletion of petroleum fuels can become a problem if not addressed quickly. This can lead to scarcity and an increase in the price of fuel oil. Alternative energy has begun to be developed as a solution to this problem, one of which is biodiesel. Biodiesel synthesis has the main ingredient in the form of oils such as palm oil, used cooking oil, rubber seed oil, crude palm oil, and others. The biodiesel synthesis reaction is a transesterification reaction that tends to be slow and long, so a catalyst is needed so that the reaction can run quickly. There are two catalysts that can be used, namely homogeneous catalysts and heterogeneous catalysts. The use of heterogeneous catalysts is easier because at the end of the reaction they can be separated easily. One of the heterogeneous biodiesel catalysts that can be used is natural zeolite catalyst. The use of natural zeolite catalysts has many advantages such as its relatively cheap price, abundant abundance in nature, and environmental friendliness. Utilization of natural zeolite as a biodiesel catalyst requires the activation of natural zeolite which can be carried out with acid or alkaline solutions. Therefore, in this review article, we discuss the % yield of biodiesel with the help of natural zeolite catalysts which are activated by acid or base from ten articles. The highest % biodiesel yield was obtained at 100% in the production of biodiesel from used cooking oil with an acid-activated Wonosari natural zeolite catalyst in the form of 6M HCl in an esterification reaction of 2% by weight of oil. Then proceed with the transesterification reaction with KOH as a base catalyst at a temperature of 60℃ with a molar ratio of oil and methanol 1:6 for 1 hour, and stirring speed of 1200 rpm. Based on the results of this review article, natural zeolite that has been activated by acid or base can be used as a catalyst in biodiesel synthesis using the transesterification and esterification method. Key words: Biodiesel, Biodiesel Catalyst, Natural Zeolite

a RIVIEW: SINTESIS BIODIESEL DENGAN KATALIS HETEROGEN DARI CANGKANG HEWAN MOLLUSCA Mukhlash Imaduddin; Samik Samik
Unesa Journal of Chemistry Vol 12 No 1 (2023)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Energy is a very important need in human life. Most of the energy needs that humans need are supplied from non-renewable natural resources such as oil, natural gas and coal. The solution given is to replace it with biodiesel. Biodiesel is an alternative energy based on plants and animals. Sources of vegetable oil can be obtained from rubber seeds and cooking oil. Rubber seeds contain about 40-50%-w vegetable oil with the dominant fatty acid composition being oleic acid and linoleic acid, while the rest are palmitic acid, stearic acid, arachidic acid and other fatty acids. Catalysts derived from several shells showed that the yield value of the highest shellfish was in green mussels with a yield of 90.1% with a reaction temperature of 65oC for 4 hours with a catalyst weight of 5% of the weight of biodiesel.. Keywords: Calcination, Transesterification, Mollusca

The PENGARUH WAKTU PANEN TERHADAP KADAR FLAVONOID TOTAL DAN AKTIVITAS ANTI-INFLAMASI EKSTRAK ETANOL DAUN YAKON (Smallanthus sonchifolius) Uci Nur Rohmah; Leny Yuanita
Unesa Journal of Chemistry Vol 11 No 2 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Yacon (Smallanthus sonchifolius) contains active ingredients in the form of flavonoids. The active ingredients of flavonoids have pharmacological activities such as antimicrobial, anti-inflammatory, and antioxidant. The formation of flavonoids in yacon leaves is influenced by the time of harvest. The study was conducted to determine the effect of harvest time on total flavonoid content and anti-inflammatory activity of ethanol extract of yacon leaf at 4, 6, and 8 months harvest time variations. Yacon leaf extraction process using maceration method. Determination of total flavonoid content in ethanol extract of yacon leaf using a colorimetric method, while testing anti-inflammatory activity using protein denaturation inhibition method. The results showed that harvest time affected total flavonoid content and the anti-inflammatory activity of ethanol extract of yacon leaf. The highest total flavonoid content was obtained at 8 months of harvest, which was 5,366 QE/g. The anti-inflammatory activity of ethanol extract of yacon leaf showed positive results, with an average inhibition value of more than 20% for each harvest time. The best IC50 value is found in yacon leaf with a harvest age of 8 months, which is 29,829 ppm. Keywords: harvest time, flavonoids, anti-inflammatory, yacon leaf

Pengaruh Variasi Penimbangan Terhadap Akurasi Penentuan Bilangan Asam Pada Alkyd Resin Firman Adji Nur Hidayat; I Gusti Made Sanjaya
Unesa Journal of Chemistry Vol 11 No 3 (2022)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

- Alkyd resin is a modified polyester with the addition of fatty acids and other components. Alkyds are derived from polyols and organic acids including dicarboxylic acids or anhydrous carboxylic acids and triglyceride oils. The quality of an alkyd resin is determined based on its parameters including solid content, viscosity, acid number, color and clarity. High acid numbers can cause the paint to turn yellow easily, therefore accuracy is needed in analyzing acid numbers. To determine the acid number is done by acidimetric titration method. Products A, B, and C were weighed respectively: 0.5g, 2g, 4g, 6g, 8g, 10g, 12g, 14g, into a 300 ml erlenmeyer which already contained 100 ml of solvent. Enter the magnetic stirrer and stir until completely dissolved over the electric heater. Add 2 drops of 1% phenolphthalein indicator into the Erlenmeyer. Pour the 0.2 alcoholic KOH solution into a 50 ml burette. The titration was carried out until the solution changed from colorless to pink. Record the volume obtained (ml). From the research conducted, the smaller the sample being weighed, the larger the deviation from the analysis of the acid number from the theoretical weighing sample (10 grams). Based on the % accuracy allowed is 3%, the weighing variable that can be tolerated is 8–14 grams. Weighing samples less than 8 grams or above 14 grams will produce acid numbers which have very large deviations. Key words: Alkyd resin, Acid number, KOH solution, Titration

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Home Page

OAI Link

Editorial Team

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Reviewer

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Contact Name Dina Kartika Maharani

Contact Email dinakartika@unesa.ac.id

Phone +628174140131

Journal Mail Official dinakartika@unesa.ac.id

Editorial Address Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231

Location Kota surabaya, Jawa timur INDONESIA

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Contact Name
Dina Kartika Maharani

Contact Email
dinakartika@unesa.ac.id

Phone
+628174140131

Journal Mail Official
dinakartika@unesa.ac.id

Editorial Address
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231

Location
Kota surabaya,

Jawa timur

INDONESIA