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All Journal JURNAL KIMIA SAINS DAN APLIKASI Journal of Mathematical and Fundamental Sciences ALCHEMY Jurnal Penelitian Kimia Communications in Science and Technology Molekul: Jurnal Ilmiah Kimia SEMAR Bulletin of Chemical Reaction Engineering & Catalysis
Witri Wahyu Lestari
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Sebelas Maret University Surakarta
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Pengaruh Metode Sintesis secara Solvo-Hidrotermal dan Elektrokimia terhadap Morfologi Struktur HKUST-1 sebagai Katalis Heterogen dalam Reaksi Esterifikasi Asam Palmitat Witri Wahyu Lestari; Joni Hartono; Dian Wahyu Tri Wulansari; Enri Pramuja; Fauziyah Azhari; Triana Kusumaningsih
ALCHEMY Jurnal Penelitian Kimia Vol 19, No 1 (2023): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.19.1.62466.1-13

Abstract

Pemilihan metode sintesis akan berpengaruh terhadap karakter material yang dihasilkan yang meliputi kristanilitas, morfologi, luas permukaan, maupun kinerja dalam aplikasinya. Pada penelitian ini telah disintesis HKUST-1 secara solvo-hidrotermal dan elektrokimia dalam pelarut EtOH:H2O (1:1 (v/v)) dan diujicobakan sebagai katalis heterogen dalam esterifikasi asam palmitat. Sintesis secara solvo-hidrotermal, berlangsung dalam autoklaf selama 12 jam pada suhu 120 °C. Sementara itu, sintesis HKUST-1 secara elektrokimia digunakan elektroda tembaga, tegangan sel 15 V selama 90 menit dengan bantuan elektrolit TBATFB pada suhu dan tekanan ambien. Uji katalitik reaksi esterifikasi asam palmitat dilakukan dengan metode refluks selama 2 jam. HKUST-1 hasil sintesis menunjukkan kesesuaian puncak dengan pola difraksi standar CCDC 112954. Hasil refinement menunjukkan HKUST-1 yang diperoleh melalui metode solvo-hidrotermal memiliki kemurnian lebih tinggi. Analisis morfologi menggunakan citra SEM menunjukkan HKUST-1 yang disintesis secara solvo-hidrotermal bergeometri oktahedral sempurna dengan ukuran partikel rata-rata 10,28±1,5 μm, sedangkan HKUST-1 yang disintesis secara elektrokimia berbentuk oktahedral cacat (defect) dengan ukuran partikel rata-rata 4,5±1,6 μm. Analisis termal menunjukkan bahwa HKUST-1 hasil sintesis memiliki stabilitas hingga 300 °C. Uji katalitik dalam reaksi esterifikasi asam palmitat dengan etanol dengan keberadaan katalis HKUST-1 (0,6% berat) menunjukkan peningkatan konversi produk dengan konversi yang paling tinggi ditunjukkan pada HKUST-1 yang disintesis dengan metode elektrokimia (mencapai 43,3%).Effect of Solvo-Hydrothermal and Electrochemical Synthesis Methods on the Structural Morphology of HKUST-1 as a Heterogeneous Catalyst in Palmitic Acid Esterification Reaction. Selection of synthesis method will influence the materials properties including crystallinity, morphology, surface area, and application performance. In this research HKUST-1 was successfully synthesized under solvo-hydrothermal and electrochemical method, and tested as a heterogeneous catalyst in esterification reactions of palmitic acid. Synthesis under solvo-hydrothermal condition was performed in an autoclave at 120 °C for 12h. In addition, the electrochemical synthesis of HKUST-1 using copper electrodes was performed at 15 V in ambient temperature and pressure, for  90 minutes with TBATFB as an electrolyte. The catalytic test in palmitic acid esterification reaction was carried out by reflux for 2h. The HKUST-1 showed conformity with the standard diffraction pattern CCDC 112954. The refinement results shows that solvothermal product has higher purity. Morphological analysis using SEM imaging showed HKUST-1 obtained from solvo-hydrothermal method possess perfect octahedral geometry with average particle size 10.28±1.58 μm, meanwhile electrochemically-synthesized possess a defect octahedral geometry with average particle size  4.5±1.6 μm. Thermal analysis showed that HKUST-1 is stable up to 300 °C. Catalytic test in esterification reaction of palmitic acid with ethanol in the presence of HKUST-1 as catalyst (0.6% wt) showed an enhanced product conversion with highest conversion was achieved in the presence of electrosyntehsized HKUST-1 (up to 43.3%).
Pengaruh Bentonit terhadap Pembentukan Fasa Polimorf dan Sifat Termal Membran Hibrida Poliviniliden Fluorida/Bentonit Edi Pramono; Rosid Eka Mustofa; Ozi Adi Saputra; Yulianto Adi Nugroho; Deana Wahyunigrum; Cynthia Linaya Radiman; Sayekti Wahyuningsih; Teguh Endah Saraswati; Sentot Budi Rahardjo; Witri Wahyu Lestari; Dian Maruto Widjonarko; Ari Handono Ramelan
ALCHEMY Jurnal Penelitian Kimia Vol 17, No 2 (2021): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.17.2.46136.177-184

Abstract

Kajian struktur dan degradasi termal pada membran hibrida poliviniliden fluorida (PVDF)/lempung bentonit (BNT) telah dilakukan. Penelitian ini bertujuan mengetahui pengaruh penambahan BNT terhadap pembentukan fasa PVDF dan sifat termalnya. Membran hibrida PVDF/lempung BNT dibuat dengan metode inversi fasa. Membran yang dihasilkan dikarakterisasi dengan attenuated total reflectance fourier transform infrared (ATR-FTIR), x-ray diffraction (XRD), dan differential scanning calorimetry (DSC). Hasil penelitian menunjukkan membran PVDF/BNT memiliki struktur polimorf PVDF fasa α dan β yang terkonfirmasi dari data FTIR dan XRD. Data DSC menunjukkan penurunan nilai titik leleh (Tm) dengan penambahan BNT, dan dengan rentang suhu pelelehan yang lebih kecil. Kristalisasi PVDF terjadi secara isothermal dan adanya BNT menghasilkan titik kristalisasi (Tc) pada suhu yang lebih tinggi dibandingkan membran PVDF murni. Analisis termal dengan DSC memberikan informasi komprehensif pelelehan dan kristalisasi dari polimorf PVDF pada matriks membran.Effect of Bentonite toward Polymorph Phase Formation and Thermal Properties of Polyvinylidene Fluoride/Bentonite Hybrid Membranes. The study of the structure and thermal properties of PVDF/bentonite (BNT) hybrid membranes has been carried out. This study aims to determine the effect of BNT addition on the phase formation and thermal properties of the PVDF. In this study, PVDF/BNT hybrid membranes were prepared through the phase inversion method. The resulting membrane was characterized by Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR), x-ray diffraction (XRD), and differential scanning calorimetry (DSC). The results showed that the PVDF/BNT membrane has a PVDF polymorph structure with α and β phases confirmed by FTIR and XRD data. The DSC data showed that the addition of BNT decrease of the melting point (Tm) and with a smaller melting temperature range. PVDF polymorph crystallization occurs isothermally and the presence of BNT produces a crystallization point (Tc) at a higher temperature than pristine PVDF membrane. Thermal analysis with DSC provides comprehensive information on melting and crystallization of PVDF polymorphs in the membrane matrix.
Study of Synthesis and Characterization of Metal-Organic Frameworks MOF-5 as Hydrogen Storage Material Prapti Rahayu; Witri Wahyu Lestari
ALCHEMY Jurnal Penelitian Kimia Vol 12, No 1 (2016): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.12.1.934.14-26

Abstract

Metal-organic frameworks (MOFs) are porous coordination polymer containing bi-or polidentate organic linker coordinated with inorganic part, such as metal oxide cluster or metal cation as node which called as secondary building unit (SBU) to form infinite structure. Due to high porosity and surface area, good thermal stability as well as the availability of unsaturated metal center or the linker influence attracts the interaction with gases, thus MOFs have potential to be applied as hydrogen storage material. One type of MOFs that have been widely studied is [Zn4O(benzene-1,4-dicarboxylate)3], namely, MOF-5.Various synthesis method have been developed to obtain optimum results. Characterization of MOF-5 from various synthesis method such as crystallinity, capacity, stability, and quantum dot behavior of MOF-5 have been summarized in this review.
Usaha Peningkatan Standar Mutu UMKM Jamu Herbal Ratu Botani Solo di Surakarta Fauziyah Azhari; Rita Rakhmawati; Widya Mudyantini; Soerya Dewi Marliyana; Nestri Handayani; Titi Wahyuni; Esti Suryani; Desi Suci Handayani; Siti Baroroh Zakiyatul Islah; Fahrul Zikri; Yeni Ermaningsih; Witri Wahyu Lestari
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 14, No 2 (2025): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v14i2.105220

Abstract

 Industri jamu Indonesia memiliki potensi ekonomi besar dengan pasar domestik Rp 20 triliun, ekspor Rp 16 triliun. Namun, UMKM jamu masih menghadapi tantangan signifikan terkait standarisasi mutu, keamanan produk, dan kepatuhan terhadap regulasi. Kegiatan pengabdian masyarakat ini bertujuan untuk meningkatkan kapasitas UMKM Jamu Ratu Botani Solo (RBS), Surakarta melalui penguatan standar mutu produk, khususnya dalam aspek uji mutu produk dan pengemasan. Metode pelaksanaan meliputi tiga tahap: (1) Pra-kegiatan dilakukan dengan FGD untuk identifikasi kebutuhan dan tantangan mitra; (2) Pelatihan penyuluhan empat materi yaitu pemilihan bahan herbal, metode ekstraksi, implementasi teknik ekstraksi skala industri, penandaan obat bahan alam. Kegiatan ini disertai pemberian bantuan alat pengemasan dan analisis mutu produk di laboratorium (3) Evaluasi keberlanjutan untuk mengukur dampak dan keberlanjutan implementasi oleh mitra. Hasil kegiatan menunjukkan peningkatan signifikan pemahaman peserta (80–100%) pada seluruh materi pelatihan, terutama terkait penandaan produk sesuai ketentuan BPOM. Mitra kini mampu mengimplementasikan teknik ekstraksi yang sesuai standar, seperti remaserasi dan digesti, dalam proses produksi jamu. Mitra juga telah memiliki akses terhadap layanan uji mutu (logam berat, kadar air, dan mikrobiologi) di laboratorium UPT UNS. Kegiatan ini berhasil memberdayakan RBS dalam memproduksi jamu berstandar nasional, meningkatkan daya saing, dan mendukung keberlanjutan usaha berbasis herbal. 
HKUST-1-Catalyzed Chan–Evans–Lam C–O Coupling Under Mild Conditions with Catalyst Reusability Muhamad R. S. Sidik; Irwan Kurnia; Yessi Permana; Ubed S.F. Arrozi; Wirawan Ciptonugroho; Witri Wahyu Lestari; Yudha Prawira Budiman
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1837

Abstract

The Chan–Evans–Lam coupling refers to a valuable method for constructing C–O and C–N bonds under mild conditions. Nevertheless, the development of efficient and reusable heterogeneous catalysts remains limited. In this study, we investigated copper-based metal–organic frameworks as catalysts for C–O bond formation between 4-methoxyphenylboronic acid and phenol. The study revealed that HKUST-1 exhibited a significant enhancement in performance when compared to Cu-BDC, yielding up to 86% at room temperature and demonstrating superior accessibility of Cu2+ active sites. A systematic optimization of reaction parameters identified NEt3 as the most effective base, DCM as the optimal solvent, and a mild temperature increase to 40 °C as the key factor enabling a maximum yield of 94%. Studies on recyclability demonstrated that HKUST-1 exhibited high catalytic performance over multiple cycles without significant structural degradation, as confirmed by PXRD analysis. Overall, this work highlights HKUST-1 as an efficient, robust, and reusable heterogeneous catalyst for Chan–Evans–Lam C–O coupling, thus demonstrating its potential for sustainable synthetic applications.
Co-Authors AGUS PURWANTO Anggia Putri Gustami Ari Handono Ramelan Bambang Heru Susanto, Bambang Heru Burhan Fatkhur Rahman Candra Purnawan Cynthia Linaya Radiman Deana Wahyunigrum Desi Suci Handayani Desi Suci Handayani Dian Maruto Widjonarko Dian Wahyu Tri Wulansari Dielsa Eka Kuswari Eddy Heraldy edi pramono Edi Pramono Elfrida Ratnawati Enri Pramuja Fahrul Zikri Fajar Rakhman Wibowo Fauziyah Azhari Fauziyah Azhari Fauziyah Azhari Fauziyah Azhari Fitria Rahmawati Fitria Rahmawati Gesyth Mutiara Hikhmah Al Ichsan Hadi Suwarno Hamzah Fansuri I.F. Nurcahyo I.F. Nurcahyo IF Nurcahyo Irwan Kurnia Jeesica Hermayanti Pratama Joni Hartono Joni Hartono Khoirina Dwi N Khoirina Dwi Nugrahaningtiyas Khoirina Dwi Nugrahaningtyas Larasati Larasati Magdalena Devi Suryono Marisa Adreane Marisa Adreane Maulidan Firdaus Muhamad R. S. Sidik Muhammad Ilham Khairuddiin Nestri Handayani Nurul Widiastuti Oktaviana Dyah Mayasari Ozi Adi Saputra Prapti Rahayu Qonita Awliya Hanif Reva Edra Nugraha Riandy Putra Rita Rakhmawati Rosid Eka Mustofa Sayekti Wahyuningsih Sentot Budi Rahardjo Sentot Budi Rahardjo Sentot Budi Rahardjo Shinta Amelia Putri Siti Baroroh Zakiyatul Islah Soerya Dewi Marliyana Teguh Endah Saraswati Titi Wahyuni Triana Kusumaningsih Triyanda Gunawan Ubed S.F. Arrozi Venty Suryanti Viona Natalia Widya Mudyantini Wirawan Ciptonugroho Wulan Cahya Inayah Yessi Permana Yudha Prawira Budiman Yulianto Adi Nugroho Yuniawan Hidayat