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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pengajaran MIPA EDUSAINS Abdimas Jurnal Inovasi Pendidikan Kimia Jurnal Bahan Alam Terbarukan Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Sainteknol : Jurnal Sains dan Teknologi Chemistry in Education Indonesian Journal of Chemical Science ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Communications in Science and Technology International Journal of Active Learning Abdimasku : Jurnal Pengabdian Masyarakat Edukimia Jurnal Pengabdian Kepada Masyarakat (JPKM) Tabikpun International Journal of Research Innovation and Entrepreneurship Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
F Widhi Mahatmanti
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Semarang State University, Jl. Raya Sekaran Gunungpati Semarang 50229
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences Other

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Penentuan Nilai LoD dan LoQ pada Pengujian Metanol pada Miras Oplosan menggunakan Gas Chromatography dengan Variasi Metode Ainul, Ahmad Akhib; Mahatmanti, F Widhi; Sulistyaningsih, Triastuti
Indonesian Journal of Chemical Science Vol 8 No 3 (2019)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v8i3.28725

Abstract

ABSTRAK Penentuan kadar metanol dalam minuman keras oplosan dapat dianalisis menggunakan Gas Chromatography-Flame Ionization Detector (GC-FID). Sebelum dianalisis, sampel minuman keras oplosan dapat dipreparasi menggunakan metode destilasi, ekstraksi cair-cair dan ekstraksi fase padat (SPE). Metode penelitian diawali dengan preparasi minuman keras oplosan menggunkan metode destilasi, ekstraksi cair-cair dan SPE kemudian dianalisis menggunakan GC-FID untuk menentukan nilai LoD dan LoQ masing-masing metode. Hasil penelitian menunjukkan bahwa linieritas kurva standar yang didapatkan sebesar 0,9996 dengan LoD dan LoQ berturut-turut 0,074% dan 0,247%. Perhitungan LoD metanol dalam sampel oplosan hasil dari ketiga metode distilasi, ekstraksi cair-cair, dan ekstraksi fase padat berturut-turut 0,048%, -0,020%, dan -0,018%. Perhitungan LoQ metanol dalam sampel oplosan hasil dari ketiga metode distilasi, ekstraksi cair-cair, dan ekstraksi fase padat berturut-turut 0,072%,-0,024, dan -0,005%. Hasil tersebut menunjukkan bahwa LoD dan LoQ dari metode distilasi lebih baik dibandingkan metode ekstraksi cair-cair dan ekstraksi fase padat, sehingga metode distilasi lebih cocok digunakan untuk menentukan kadar metanol dalam miras oplosan menggunakan GC-FID ABSTRACT Determination of methanol in alcoholic beverage can be analyzed by using Gas Chromatography-Flame Ionization Detector (GC-FID). Alkoholic beverage samples are first prepared with distillation method, liquid-liquid extraction, and solid phase extraction to remove impurities. This study aims to determine the most good preparation based on LoD and LoQ value. The standard curve linearity which was obtained in the amount of 0.9996 with LoD and LoQ respectively 0.0743% and 0.2477%. Calculation of LoD methanol in the beverage results from all three distillation methods, liquid-liquid extraction, and solid phase extraction were respectively 0,048126%, -0,019919%, and -0,018107%. Calculation of LoQ methanol in the beverage results from all three distillation methods, liquid-liquid extraction, and solid phase extraction were respectively 0,072629%,-0,024376, and -0,005351%. Those results indicated that LoD and LoQ distillation method were better than liquid-liquid extraction and solid phase extraction methods. So it can be concluded that the distillation method is more suitable to determine the methanol levels in the alcoholic beverage using GC-FID.
Sintesis Zeolit dari Kaolin sebagai Carrier Amoksisilin Wardani, Deta Sri; Mahatmanti, F. Widhi; Jumaeri, Jumaeri
Indonesian Journal of Chemical Science Vol 9 No 2 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i2.28728

Abstract

Abstrak Pada penelitian ini dilakukan sintesis zeolit dari kaolin dan kemampuannya sebagai carrier amoksisilin. Proses sintesis zeolit diawali dengan kalsinasi kaolin menjadi metakaolin, kemudian ditambahkan larutan NaOH 3,0 M dan diaduk selama 2 jam. Proses pembentukan kristal zeolit menggunakan metode hidrotermal pada suhu 100ºC selama 8 jam. Zeolit hasil sintesis dikarakterisasi menggunakan instrumen FTIR, XRD, dan SAA. Zeolit sintetis digunakan sebagai carrier obat amoksisilin dengan parameter adsorpsi dan desorpsi. Hasil karakterisasi zeolit hasil sintesis dilihat dari gugus fungsi dan pola difraksi menunjukkan kemiripan dengan zeolit A. Diameter pori zeolit sintetis sebesar 7,44 Å dan luas permukaannya adalah 3,456 m2/g. Kondisi optimum zeolit hasil sintesis dalam mengadsorpsi amoksisilin terjadi pada pH 5 dan waktu kontak selama 75 menit, dan kapasitas adsorpsinya sebesar 5,356 mg/g atau 80,334%. Sedangkan untuk amoksisilin yang terlepas dari zeolit sebesar1,561 mg/g atau 29,144%. Abstract This research is to know the of zeolite synthesis based kaolin ability as drug carrier amoxicillin. The synthesis process of zeolite begin with calcination of kaolin to methakaolin, then added 3.0 M NaOH solution and stirred for 2 hours. Followed by the process of making zeolite crystals using hydrothermal method at temperature 100oC for 8 hours. Synthetic zeolites was characterized using FTIR, XRD, and SAA instruments. Synthetic zeolites are then used to drug carrier amoxicillin with parameter adsorption and desorption. The results of characterization of the synthesized zeolite seen from the functional groups and diffraction patterns show similarities with zeolite A. The pore diameter of synthetic zeolite is 7.44 Å and its surface area is 3.456 m2/g. While amoxicillin released for zeolite as 1.561 mg/g or 29.144%.
Sintesis ρ-mentana-3,8-diol dan Aplikasinya sebagai Gel Air Freshener Penolak Nyamuk Aedes aegypti Syafi'i, Imam; Cahyono, Edy; Mahatmanti, F. Widhi; Alighiri, Dante
Indonesian Journal of Chemical Science Vol 9 No 3 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i3.34086

Abstract

ρ-Menthane-3,8-diol (PMD) has been synthesized from citronellal with citric acid catalyst through a cyclization process by stirring and heating. Citric acid is used as a substitute for sulfuric acid in PMD because it is cheap, safe and is an effective alternative to synthesis. The result of PMD synthesis from citronellal by 5 g citronellal; 7 g of citric acid solution 10%; for 8 hours stirring at 50o temperature were obtained 71.15% yield; 100.00% conversion; and 71.15% selectivity. PMD gel air freshener is made using PMD then formulated with carrageenan as a gelling agent with PMD variations. The higher PMD content in gel increase the water holding capacity. The best mosquito repellent strength was obtained from PMD gel with 15% PMD which has the greatest mosquito repellent strength in 60 minute (65.00%).
Preparasi Komposit Kitosan-Alumina Beads sebagai Adsorben Ion Logam Kadmium(II) dan Nikel(II) dalam Larutan Noviana, Melly; Mahatmanti, F Widhi
Indonesian Journal of Chemical Science Vol 9 No 1 (2020)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v9i1.36782

Abstract

It has been done preparation of composite beads from chitosan and alumina for adsorption Cd(II) and Ni(II). Research includes the preparation of adsorbents (chitosan beads, alumina, and composite beads) and adsorption optimization including pH, contact time, concentration and selectivity. FT-IR characterization showed the presence of a typical group of composite beads. The SAA characterization showed chitosan beads including micropores, alumina and composite beads including mesopores. The optimization results of Cd(II) adsorption showed the optimum concentration at 0.55 mmol/L, while the optimization of pH and contact time of chitosan beads were obtained at pH 6 for 90 minutes, optimum alumina at pH 5 for 60 minutes, and optimum composite beads at pH 6 for 60 minutes . The optimization results of Ni(II) adsorption showed the optimum contact time at 60 minutes, while the optimization of pH and the concentration of chitosan beads occurred at pH 6 with a concentration of 0.65 mmol/L, optimum alumina at pH 7 with a concentration of 0.65 mmol/L, and the optimum composite beads at pH 6 with a concentration of 0.55 mmol/L. The amount of adsorbed Ni(II) 3,797x10-2 mmol/g and Cd(II) 1,7997x10-2 mmol/g, so that composite beads are more selectively adsorbing Ni(II) compared to Cd(II).
Steel Corrosion Protection with Water-Soluble Chitosan Inhibitor in 0,1 M HCl Solution Media Fitria, Reffy Ika; Mahatmanti, F. Widhi; Kurniawan, Cepi; Kusumastuti, Ella
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i1.46015

Abstract

Corrosion in steel can reduce the steel quality, so it is necessary to have a corrosion inhibitor. Water-soluble chitosan can be an alternative as corrosion inhibitors. This study aims to determine the efficiency of water-soluble chitosan inhibitor (WSC) added to the corrosive HCl solution in the steel protection process, and to determine the maximum concentration of WSC as a steel corrosion protector. Water-soluble chitosan (WSC) has been prepared from chitosan by reacting with H2O2. The products obtained were used as corrosion protection inhibitors in steel in a corrosive solution of 0,1 M HCl. Chitosan and WSC were characterized by their physical properties and functional groups using FTIR and physical tests for yield, viscosity, molecular weight (BM),% DD, solubility, and water content. . The effectiveness of WSC in corrosion protection of steel in corrosive 0,1 M HCl solution was studied by weight loss and potentiodynamic polarization methods. The results obtained by chitosan were a viscosity of 1,4969 cP, BM 8,38 x 104,% DD 77,17%, 10,25% moisture content and 33,48% solubility. Water-soluble chitosan obtained yield 86.325%, viscosity 0,296 cP, BM 6,9 x 103,% DD 79,95%, water content 27,07% and 72,77% solubility. Inhibitor efficiency was found in WSC 2000 ppm and 0,1 M HCl, which was 68,15% EI (weight loss), while the potentiodynamic polarization method obtained an EI of 87,5%.
Leaching Time and Nitric Acid Concentration Effect on the Separation of Lanthanum and Neodymium Elements from Neodymium Concentrates Astuti, Indri Puji; Mahatmanti, F. Widhi; Setyadji, Moch.; Sudibyo, Raden
Indonesian Journal of Chemical Science Vol 10 No 1 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The process of separating the elements of lanthanum (La) and neodymium (Nd) from neodymium concentrate (Nd(OH)3) by calcination and leaching processes to determine the effect of leaching time and HNO3 concentration. The separation process begins with calcination of the Nd(OH)3 concentrate, which functions to decompose the neodymium oxide concentrate into neodymium oxide concentrate. The process was continued with leaching with variations in leaching time (5, 10, 15 and 20 minutes) using 1 M HNO3. The results of the separation of La and Nd with the optimum time were used for leaching with variations in the concentration of HNO3 (0.5, 1, 1.5 and 2 M). During the leaching process the factor that was kept constant was the ratio of sample solids to 1: 5 HNO3 solution, using room temperature and a stirring speed of 150 rpm. The La and Nd elements separated the best at a leaching time of 10 minutes and a concentration of 1 M HNO3 with the magnitude of the leaching efficiency was 63.140% and 56.238%.
Acivated Activated Carbon from Kepok Banana Peel (Musa padisiaca L.) as Methyl Orange and Methyl Violet Adsorbent in Aqueous Solution Anindya, Bella Diska; Mahatmanti, F. Widhi; Kusumastuti, Ella; Wahyuni, Sri
Indonesian Journal of Chemical Science Vol 10 No 3 (2021)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijcs.v10i3.51178

Abstract

Kepok banana peel is used as raw material for activated carbon for adsorption of methyl orange and methyl violet because it has a high lignocellulose content of 90.7%. Methyl orange and methyl violet are azo dyes that have a benzene structure that is very difficult to degrade. This study aims to determine the characteristics of activated carbon from kepok banana peel waste and to determine the optimum conditions for adsorption of methyl orange and methyl by activated carbon which include pH, contact time, and initial concentration of dye. This study includes the preparation of adsorbents (activated carbon from banana peels activated ZnCl2) and adsorption optimization includes optimization of pH, contact time, and concentrations of methyl orange and methyl violet in solution. The results showed that the characterization of activated carbon using an infrared spectrophotometer contained the presence of O-H, C=O, C-H, and C-O groups on activated carbon without activation, activated ZnCl2, and after adsorption was used. Characterization using a surface area analyzer with the BET method showed that activated carbon without activation had a surface area of ​​2.278 m2/g and a pore diameter of 2.0548 nm which was included in the mesoporous category. While activated carbon activated ZnCl2 has a surface area of ​​106.287 m2/g and a pore diameter of 1.5111 nm which is included in the category of micropores. The optimum conditions for methyl orange adsorption were obtained at pH 3, a contact time of 80 minutes, and a concentration of 0.3 mmol/L, while the optimum conditions for methyl violet adsorption were obtained at pH 5, a contact time of 80 minutes, and a concentration of 0.4 mmol/L.
KEEFEKTIFAN MATERI AJAR PENYANGGA BERBASIS PEMECAHAN MASALAH PADA KEMAMPUAN BERPIKIR KREATIF SISWA Putri, Syarafina Dirinda; Wijayati, Nanik; Mahatmanti, F. Widhi; Rachmadiyono, Dwi
Jurnal Inovasi Pendidikan Kimia Vol 15, No 2 (2021): July 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jipk.v15i2.15642

Abstract

Penelitian ini bertujuan untuk mengetahui keefektifan dan tanggapan siswa terhadap materi ajar larutan penyangga berbasis pemecahan masalah untuk kemampuan berpikir kreatif siswa kelas XI SMA Negeri 1 Wonogiri. Metode penelitian yang digunakan adalah eksperimen dengan desain penelitian only posttest control design. Teknik sampling yang digunakan yaitu cluster random sampling dengan syarat data populasi berdistribusi normal dan homogenitas. Didapatkan hasil pemilihan sampel yaitu kelas XI MIPA 2 sebagai kelas eksperimen dan kelas XI MIPA 3 sebagai kelas kontrol. Teknik analisis yang digunakan yaitu uji perbedaan dua rata-rata. Hasil penelitian diperoleh perhitungan bahwa kedua kelas berdistribusi normal  dan perhitungan perbedaan dua rata-rata diperoleh sebesar 3,94 yang menunjukkan bahwa kelas eksperimen lebih baik daripada kelas kontrol. Untuk rata-rata tiap indikator berpikir kreatif diperoleh 66% untuk kelas eksperimen dan 54% untuk kelas kontrol pada Fluency, pada Flexibility diperoleh 67% untuk kelas eksperimen dan 60% untuk kelas kontrol. Untuk Originality 56% untuk kelas eksperimen dan 59% untuk kelas kontrol, kemudian Elaboration 61% untuk kelas eksperimen dan 60% untuk kelas kontrol. Berdasarkan hasil penelitian dapat didismpulkan bahwa materi ajar berbasis pemecahan masalah efektif terhadap kemampuan berpikir kreatif siswa kelas XI SMA Negeri 1 Wonogiri pada materi larutan penyangga.
Color and Chemical Oxygen Demand Removal of Strobilanthes cusia Fermentation and Natural Indigo-based Batik Dyeing Wastewater Kurniawan, Cepi; Mahatmanti, F. Widhi; Mahfudz, Johar; Qonita, Ulya; Nugraha, Rizki; Bahron, Hadariah
International Journal of Research Innovation and Entrepreneurship Vol 2 No 1 (2021): June 2021
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/ijrie.v2i1.48688

Abstract

Strobilanthes cusia is the plant which has been cultivated at the District of Temanggung, Indonesia and used as a natural source for indigo dye. The use of natural dyes for Batik Industries are expected to prohibit environmental damage. However, the wastewater generated from the indigo extraction and Batik dyeing process is still showing high COD value (768-3.893 ppm). In the present study, color and COD removal from Strobilanthescusia processing (settling pond) and Indigo-based Batik dyeing (equalization tank) wastewater have been studied. The treatment involving the use of FeSO4, Alum, and Cyclea Barbata Miers. powder (CBM) as coagulation-flocculation agents. Alum was efficiently reduced color up to 97% and 93% for settling pond and equalization tank effluent, respectively. The highest COD removal efficiencies of 87 % and 63% were observed for settling pond and equalization tank effluent, respectively.
PENGOLAHAN BUAH DAN BIJI RAMBUTAN SEBAGAI MAKANAN TRADISIONAL KOKTAIL, MANISAN, EMPING BIJI RAMBUTAN DAN OBAT HERBAL YANG BERKHASIAT Widiarti, Nuni; Wahyuni, Sri; Mahatmanti, F Widhi
Rekayasa : Jurnal Penerapan Teknologi dan Pembelajaran Vol 11, No 2 (2013): Desember 2013
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v11i2.10136

Abstract

Kegiatan pengabdian kepada masyarakat berupa penyuluhan Pengolahan Buah Dan Biji Rambutan Sebagai Makanan Tradisional Koktail, Manisan, Emping Biji Rambutan Dan Obat Herbal Yang Berkhasiat bertujuan untuk memberikan pengetahuan kepada masyarakat khususnya ibu-ibu PKK dukuh kanggan Desa Wringinputih terhadap manfaat rambutan, dan biji rambutan terhadap kesehatan beserta bagaimana meningkatkan nilai jual rambutan dan biji rambutan pada saat panen raya. Khalayak sasaran dalam pengabdian masyarakat ini adalah ibu-ibu rumah tangga di dukuh Kanggan Desa Wringinputih khususnya warga RT 01 dan 02 RW XIII yang berjumlah 20 orang. Metode yang dilakukan dalam pngabdian ini adalah penyuluhan dan demonstrasi pembuatan emping serta manisan buah rambutan. Manfaat yang diperoleh dari hasil pengabdian ini adalah masyarakat menjadi tahu manfaat dari daun hingga akar dan buah rambutan terhadap berbagai penyakit dan kecantikan.
Co-Authors - Jumaeri A.A. Ketut Agung Cahyawan W Adhi, Nino Agung Tri Prasetya Agung Tri Prasetya Ainul, Ahmad Akhib Aisyah, Amma Aisyah, Amma Alighiri, Dante Andri Cahyo Kumoro Anindya, Bella Diska Aprilia, Nurkintan Arie Fitry Apriyanti, Arie Fitry Arum Mawar Wati Astuti, Indri Puji Atika Rapierna, Atika Bahron, Hadariah Basir, Ikhsan Fadilah Basir, Ikhsan Fadilah Cepi Kurniawan Cindy Dwi Herawan, Cindy Dwi Deviani, Siska Shelvia Deviani, Siska Shelvia Dewi, Nuriana Rahmani Dian Sri Asmorowati Didik Prasetyoko Edy Cahyono Eka Hartanti, Eka Eko Budi Susatyo Ella Kusumastuti, Ella Endang Susilaningsih Endang Susilowati Fitria, Reffy Ika Fivi Dessy Khodijah Hanis, Harjono Hanis, Harjono Haq, Ismi Arinal Harjito - Hayyu Fitriah, Hayyu Hilda Chalimatus SC, Hilda Chalimatus Hutasoit, Parpulungan Hutasoit, Parpulungan Indah Puji Lestari Laeli Kurniasari Latifah Latifah Libiyana Nurviantika, Libiyana Luluatul Maghfiroh, Luluatul M. Alauhdin, M. Mahardika Prasetya Aji Mahfudz, Johar Marsudi Marsudi Martien Herna Susanti Maulida Zakia Melykhatun, Rizka Ayu Mika Septiawan, Mika Miranda Oxtariani Moch. Setyadji Moh Djaeni Mohammad Alauhdin, Mohammad Muryani Dinata, Muryani Naftalina Ulik Adhelia Nanik Wijayati Narsito Narsito Narsito Narsito Noviana, Melly Nugraha, Muhammad Septian Nugraha, Muhammad Septian Nugraha, Rizki Nuni Widiarti Nurmala, Novera Ayang Nurmala, Novera Ayang Nuryono Nuryono Nuryono Nuryono octavia uriastanti, octavia Patricia, Amelinda Diana Patricia, Amelinda Diana Persada, Mega Bunga Persada, Mega Bunga Pratiwi, Khana Fitri Pratomo, Sigit Wahyu Pratomo, Sigit Wahyu PUJI LESTARI Putra, Rizki Suhendar Putri, Syarafina Dirinda Qonita, Ulya Rachmadiyono, Dwi Rahayu, Endah Fitriani Rahmalia, Berliana Putri Ramadhan, Dinar Alghifari Ratri, Irwandari Rahma Nur Ratri, Irwandari Rahma Nur Renni, Chayun Pida Renni, Chayun Pida Rini Susanti Wulandari Rizki Yuniarti, Rizki Roichatuttamamah, Wirda Rusadi, Eka Rusadi, Eka Samuel Budi Wardhana Kusuma Sari, Erlin Purwita Sari, Erlin Purwita Sari, Nur Vita Sari, Nur Vita Senda Kartika Rakainsa Seta Kahardian Ardana, Seta Kahardian Setia Budi Sasongko Siti Maesaroh Siti Sundari Miswadi Sri Haryani Sri Mantini Rahayu Sedyawati, Sri Mantini Rahayu Sri Nurhayati Sri Susilogati Sumarti Sri Wahyuni SRI WARDANI Sudarmin - Sudarmin Sudarmin Sudibyo, Raden Sulistyani, Martin Suprapto, Surapto Sutikno Sutikno Syafi'i, Imam Triastuti Sulistyaningsih Wara Dyah Pita Rengga Wardani, Deta Sri Warlan Sugiyo Wati, Safna Rahma Widhihastuti, Endah Widiya Aprilianti Wisnu Sunarno Woro Sumarni Yogo Setiawan Yuan Maylia Rosanti Yuni Susanti, Devi