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Molekul: Jurnal Ilmiah Kimia

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Published by Universitas Jenderal Soedirman

ISSN : 19079761 EISSN : 25030310 DOI : -

Core Subject : Science, Engineering,

Chemical Engineering, Chemistry & Bioengineering Chemistry

MOLEKUL is a peer-reviewed journal of chemistry published by the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Jenderal Soedirman University, Indonesia. Publishing frequency 2 issues per year, on May and November. This Journal encompasses all branches of chemistry and its sub-disciplines including Pharmaceutical, Biological activities of Synthetic Drugs, Environmental Chemistry, Biochemistry, Polymer Chemistry, Petroleum Chemistry, and Agricultural Chemistry.

Arjuna Subject : -

Articles 331 Documents

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FOTOREDUKSI CO2 HASIL DEGRADASI LIMBAH CAIR ORGANIK MENGGUNAKAN FOTOKATALIS TiO2-Zn Kapti Riyani; Tien Setyaningtyas; Dian Windy Dwiasi
Molekul Vol 9, No 2 (2014)
Publisher : Universitas Jenderal Soedirman

Penelitian ini bertujuan untuk membuat metanol dari limbah cair tahu menggunakan proses fotoreduksi. Penelitian diawali dengan pembuatan fotokatalis TiO2-Zn menggunakan teknik fotodeposisi. Karakterisasi fotokatalis dilakukan menggunakan UV-Vis DRS dan FTIR. Optimasi kondisi fotokatalisis yang digunakan yaitu perbandingan mol TiO2 : Zn (100:0 ; 99:1 ; 98:2 ; 97:3 dan 96:4) yang dipreparasi menggunakan metode fotodeposisi dan pH limbah cair untuk proses fotokatalisis (2, 5, 7, 9 dan 13). Limbah cair organik akan didegradasi oleh fotokatalis TiO2-Zn dimana akan menghasilkan CO2. CO2 yang dihasilkan selanjutnya akan mengalami fotoreduksi menjadi metanol.Metanol yang dihasilkan dianalisis menggunakan kromatografi gas. Hasil penelitian menunjukkan bahwa metanol dapat dibuat dari limbah cair organik menggunakan fotokatalis TiO2-Zn. Hasil fotoreduksi CO2 dari hasil fotodegradasi limbah cair organik adalah metanol dengan kondisi optimum katalis TiO2 : Zn 98:2 dan pH limbah cair 2.

Preparation of Polycrystalline Silicon from Rice Husk by Thermal Decomposition and Aluminothermic Reduction Ahmad Nuruddin; Brian Yuliarto; Adhitya Gandaryus Saputro; Badruzaman Badruzaman; Aditianto Ramelan
Molekul Vol 15, No 1 (2020)
Publisher : Universitas Jenderal Soedirman

Polycrystalline silicon was extracted from rice husk by thermal decomposition and aluminothermic methods. Rice husk was thermally decomposed under various heat treatments and acid purifications. High purity silica of 99.81% was obtained by subsequent rice husk washing, pressure cooking in mixed chloride acid peroxide solution, and burning at 500oC for one hour. Aluminothermic reduction of silica was conducted at various calcination temperatures. It is found that 78.6% of silica was converted to silicon for calcination temperature of 800oC. Leaching the reduction product with strong hydrochloric and hydrofluoric acids produced silicon polycrystalline with a purity of 99.91%.

The Hydrophobicity and the Antibacterial Activity of Polyester Modified With Silver Nanoparticle and Hexadecyltrimethoxysilane Eli Rohaeti; Anna Rakhmawati
Molekul Vol 12, No 1 (2017)
Publisher : Universitas Jenderal Soedirman

The objective of this research were to study hydrophobicity and antibacterial activity of polyester fibers before and after modification by using silver nanoparticles as antibacterial agent and hexadecyltrimethoxysilane (HDTMS) as self cleaning agent. The research was conducted in stages, chemical preparation of silver nanoparticles, deposit of silver nanoparticles on polyester fiber, modification of polyester fiber through the addition HDTMS, and characterization. Modification of polyester fibers with silver nanoparticles and HDTMS was conducted through dipping method, followed by curing. Characterization was conducted by testing the contact angle and antibacterial activity against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 35218. Silver nanoparticles has been prepared by adding sodium citrate and polyvinylalcohol as stabilizer. The addition of silver nanoparticles decreased hydrophobicity of polyester fibers without and with modification. Modification with HDTMS increased hydrophobicity of polyester fibers. Modification with silver nanoparticles and HDTMS increased antibacterial activity of polyester fabrics. Statistic analysis showed that there were significant differences in the antibacterial activity of polyester fibers against Staphylococcus aureus ATCC 25923 and Escherichia coli ATCC 35218

Physical Damages of Wood Fiber in Acacia Mangium due to Biopulping Treatment Ridwan Yahya; Mucharromah Mucharromah; Devi Silsia; Septiana Septiana
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Biopulping is fungal pretreatment of wood chips to reduce unused chemical composition of material in pulping. Preliminary study showed that pretreatment of Phanerochaetachrysosporium to Acacia mangium Willd can reduce lignin and improve holocellulose and cellulose content of the material. Fiber dimension recognized as other important factor for paper properties. The question is how the integrity and dimensions of the wood fiber that has been pretreated with the fungus. The objectives of present study were to know effect of pretreatment of P. chrysosporium to the integrity and dimensions of the fiber. The P. chrysosporium was cultured for 14 days in growth medium, and inoculated to wood chips 5% (w/v) and incubated for 0, 15 and 30 days. The inoculated wood chips were chipped into 1 mm x 1 mm x 20 mm and macerated using franklin solution at 60 oC for 48 hours. Forty fibers from each incubated time were analized their physical damages using a light microscope at a 400 magnification. The inoculated fibers were measured theirs dimensions. The physical damage percentage of fibers pretreated using P. chrysosporium was 0%. Length and wall thickness of the pretreated fibers were can be categorized as middle class and thin fibers, respectively.

Landfill Leachate Degradation by TiO2-Immobilized White Cement Ni Wayan Yuningrat; I Putu Parwata; Putu Frisca Dora Jastrissia; Made Vivi Oviantari; I Wayan Mudianta
Molekul Vol 13, No 1 (2018)
Publisher : Universitas Jenderal Soedirman

This report presented the characterisation of white cement and TiO2-immobilised white cement prior and after photodegradation treatment. The study was also aimed at measuring the effectiveness of catalyst that was used during the photodegradation at various different reaction times. The characteristic of the white cement was evaluated by XRD, meanwhile the effectiveness of the catalyst was inferred from COD values. The results indicated that the white cement formed crystals with highest peak at 2ϴ 29.7990° and crystal size of 0.63140 nm. In addition, the highest peak of the TiO2-immobilized white cement before and after photodegradation was 2ϴ 29.4634° (crystal size 0.79209 nm) and 29.4735° (crystal size 0.64061 nm) respectively. Moreover, dissolved organic matter in landfill leachate reduced during the seven-hour photodegradation experiment as indicated by the decrease of 71.43% of the COD values.

Cytotoxic Steroids from The Stem Bark of Chisocheton cumingianus (Meliaceae) Dewa Gede Katja; Kindi Farabi; Nurlelasari Nurlelasari; Desi Harneti; Euis Julaeha; Ace Tatang Hidayat; Tri Mayanti; Rani Maharani; Unang Supratman; Khalijah Awang
Molekul Vol 12, No 1 (2017)
Publisher : Universitas Jenderal Soedirman

Three cytotoxic steroids, stigmasterol (1), stigmast-5-en-3b-ol (2) and b-sitosterol-3-O-acetate (3) were isolated from the stem bark of Chisocheton cumingianus. The chemical structures of those compounds were identified based on spectroscopic data and by comparison with those data previously reported. All of the compounds isolated were evaluated for their cytotoxic effects against P-388 murine leukemia cells in vitro. Compounds 1-3 showed cytotoxicity activity against P-388 murine leukemia cells with IC50values of 12.4, 60.8, and ÃÂ 100 mg/mL, respectively.

A Cytotoxic Compound from n-Hexane Fraction of Lantana camara Linn Leaves Suryati Suryati; Yuni Malasari; Mai Efdi; Elida Mardiah
Molekul Vol 14, No 1 (2019)
Publisher : Universitas Jenderal Soedirman

In this study, one triterpenoid compound from n-hexane fraction of Lantana camaraLinn leaves has cytotoxic activity was isolated. Isolation was carried out using gravity chromatographycolumnand purification by recrystallization method. Isolated compound was obtained white solid with melting point 252-253oC. The structure of isolated compound was elucidated using spectroscopic analysis Ultraviolet (UV), Infrared (IR), 1H-Nuclear Magnetic Resonance (1H-NMR), 13C-Nuclear Magnetic Resonance (13C-NMR) Heteronuclear Multiple Bond Connectivity (HMBC), Heteronuclear Multiple Quantum Correlation (HMQC), Distortionless Enhancement Polarization Transfer (DEPT) and comparative literature data, identified as Lantadene A (22β-angeloyloxy-3-oxoolean-12-en-28-oic-acid) with molecule formula C35H52O5. The Lantadene A compound was evaluated for cytotoxic activity against shrimp larvae Artemia SalinaLeach using Brine Shrimp Lethality Test(BSLT) method, showed strong cytotoxic activity with an LC50value of 48.97 µg/mL.

Fractionation And Environmental Risk Of Trace Metals In Surface Sediment Of The East China Sea By Modified BCR Sequential Extraction Method Roy Andreas; Jing Zhang
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Geochemical fractionation of Cadmium (Cd), Lead (Pb), Cobalt (Co), Zink (Zn), Iron (Fe) and Manganese (Mn) in sediment of the East China Sea were determined using four-stages of modified BCR sequential extraction method combination with ICP-MS. The total concentration of trace metals in sediment samples were in the following order: Fe >Mn>Pb> Zn > Co > Cd. Cd is present mainly in acid soluble fraction. Pb and Mn are in the group with presenting of easy reducible fraction and acid soluble fraction. Fe and Co were found in a group with mainly in residual fraction, while Zn was distributed in all four fractions. The highest contamination factors were found for Cd and Mn while the lowest were found for Fe and Co in almost station. The result showed low risk for Fe and Co in all station, Pb (except S2 and S3), Zn at S3,S6 and S7, and Mn at S1. A medium risk is indicated for Pb at S2 and S3, Zn at S1 and S5, and Mn at S2 and S6. A high risk showed for Zn at S2 and S4, and Mn at S4 and S5, while Cd at almost station (except S4) was very high risk.

Degradation of Paraquat in Gramoxone Pesticide with Addition of ZnO Febrina Arfi; Safni Safni; Zaimi Abdullah
Molekul Vol 12, No 2 (2017)
Publisher : Universitas Jenderal Soedirman

Paraquat is the most toxic herbicide, the main agricultural crops and plantations that use them are cloves, cocoa, oil palm, rubber, coffee, and pepper. Therefore, it is necessary to study to degrade paraquat compounds by photolysis method with using ZnO. Photolysis is a process of UV irradiation with a wavelength of 200-400 nm. In this study Photolysis method used UV light with λ = 365 nm. Degradation of paraquat compound was done with the influence of variation of time without the addition ZnO, the influence of ZnO additional variations, and the effect of combination between variations of time and optimization of ZnO addition. The result of the study shows that photolysis degradation product without the addition of ZnO for 120 minutes has been degraded by 12.56%. While the optimum addition of 0.1 grams ZnO increased the percentage of degradation which is about 57.64%. This is proved that the addition of ZnO with photolysis method can degrade more paraquat compounds.

SYNTHESIS OF 1,4-BIS [(1-HYDROXY-4-T-BUTYL-PHENYL) METHYL]PIPERAZINE AS ANTIOXIDANTS Susy Yunita Prabawati
Molekul Vol 11, No 2 (2016)
Publisher : Universitas Jenderal Soedirman

A study has been conducted to synthesize 1,4-bis [(1-hydroxy-4-t-butyl-phenyl)-methyl]piperazin using phenol derivate and investigate the capability of that compound, as an antioxidant. The synthesis was carried out through Mannich reaction using p-t-butylphenol, paraformaldehyde, and piperazine. The product was characterized by IR and 1H NMR spectroscopic. Testing of antioxidant activity was done with the immersion of DPPH (1,1-diphenyl-2 picrylhydrazyl) free radical method. The product was obtained as a white solid, with a point of 252,7-254,7 ºC and a yield of 65.76%. The test of antioxidant activity with DPPH method showed that 1,4-bis [(1-hydroxy-4-t-butyl-phenyl)-methyl]piperazin had the IC50 values was 0.84 nM. It means that the 1,4- bis[(1-hydroxy-4-t-butyl-phenyl )methyl]piperazine has potential as antioxidants.

Page 33 of 34 | Total Record : 331

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Home Page

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Contact Name Amin Fatoni

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Journal Mail Official j.molekul@gmail.com

Editorial Address Jl. Dr. Soeparno No.61 Karangwangkal, Purwokerto, Jawa Tengah 53

Location Kab. banyumas, Jawa tengah INDONESIA

Abstract

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Abstract

Contact Name
Amin Fatoni

Contact Email
aminfatoni@unsoed.ac.id

Phone
-

Journal Mail Official
j.molekul@gmail.com

Editorial Address
Jl. Dr. Soeparno No.61 Karangwangkal, Purwokerto, Jawa Tengah 53

Location
Kab. banyumas,

Jawa tengah

INDONESIA