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All Journal VALENSI CHEMICA Jurnal Teknik Kimia The Journal of Pure and Applied Chemistry Research Journal of Mathematical and Fundamental Sciences Jurnal Riset Kimia SEMIRATA 2015 Jurnal Kimia dan Kemasan Chimica et Natura Acta ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Majalah Farmasetika Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Kimia dan Kemasan
Zulhadjri Zulhadjri
Chemistry Department, Andalas University
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences Other

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PEMBERDAYAAN PEREMPUAN MELALUI TEKNOLOGI QUILLING PAPER SEBAGAI USAHA ALTERNATIF BERBASIS LINGKUNGAN DI DESA MARUNGGI KOTA PARIAMAN Olyy Norita Tetra; Bustanul Arifin; Marniati Salim; Admin Alif; Zulhadjri Zulhadjri
Jurnal Pengabdian Warta Andalas Vol 25 No 1 (2018): Warta Pengabdian Andalas
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

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Abstract

Empowering women through the improvement of quilling paper handicraft skill withpaper waste material in Desa Marunggi, Kota Pariaman which is the first winner of WestSumatera Dasawisma but this has not been the activity of used paper mill into handicraftproduct with high selling price. The activity begins with environmental sanitation and healthwaste disposal training, advanced waste paper treatment training with quilling papertechnology with modification process that is expensive expensive quilling paper paper withwaste paper. Simple processing and combined with paper waste around the high crafts, artisticand unique products, such as wall decoration, souvenir, multipurpose box, miniature, jar, bag,tissue box, doll and others. The training activities were attended by ± 40 participants attendedby women in PKK and heads of dasawisma groups. This activity is more interesting because itis held handicraft with handicraft goods from hand made. Through this dedication activity, itis hoped that the cooperation of universities and society so that can increase women's resourcesthrough home industry, increase knowledge, skills and is an improvement program of womenparticipation in development.
Penerapan Teknologi Paper Filigree 3-Dimensi Berbasis Limbah Menjadi Produk Bernilai Ekonomi Tinggi dalam Meningkatkan Pendapatan Rumah Tangga di Talawi Mudik Olly Norita Tetra; Bustanul Arifin; Hermansyah Aziz; Zulhadjri Zulhadjri; Indrawati Indrawati; Yulizar Yusuf
Warta Pengabdian Andalas Vol 26 No 4.a (2019)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.26.4.a.271-277.2019

Abstract

The activity of utilizing waste paper into high economic value products had been carried out in Talawi Mudik. The activity was carried out through the transfer of Paper Filigree 3-Dimensional technology, namely processing waste paper into a classy business based on zero waste. That it can contribute in empowering the community, especially increasing family income, contributing to women who did not work and activated of PKK and dasawisma. The purpose of this activity was to make this technology business opportunity. It can be done by anyone due to the processing in short time, low invest, used tools and materials surrounding. The community service activity started with counseling the dangerous of paper waste in health and environment, followed by training on waste paper processing with simple waste-based techniques. In the training, the participants immediately practiced producing products, assisted until they do themself. The participants were equipped with entrepreneurial concepts and marketing techniques to motivated them to form a home industry. It could impact on new job opportunities, increased family income and the formation of new business groups that provided the program to be sustainable.
SYNTHESIS OF MAGNETIC NANOPARTICLES OF TiO2-NiFe2O4: CHARACTERIZATION AND PHOTOCATALYTIC ACTIVITY ON DEGRADATION OF RHODAMINE B Rahmayeni Rahmayeni; Syukri Arief; Yeni Stiadi; Rianda Rizal; Zulhadjri Zulhadjri
Indonesian Journal of Chemistry Vol 12, No 3 (2012)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (418.312 KB) | DOI: 10.22146/ijc.21335

Abstract

Magnetic nanoparticles of TiO2-(x)NiFe2O4 with x = 0.01, 0.1, and 0.3have been synthesized by mixture of titanium isopropoxide (TIP) and nitric metal as precursors. The particles were characterized by XRD, SEM-EDX, and VSM. XRD pattern show the peaks at 2q = 25.3°, 38.4° and 47.9° which are referred as anatase phase of TiO2. Meanwhile NiFe2O4 phase was observed clearly for x = 0.3. The present of NiFe2O4 can prevent the transformation of TiO2 from anatase to rutile when the calcination temperature increased. Microstructure analyses by SEM show the homogeneous form and size of particles. The magnetic properties analysis by VSM indicates that TiO2-NiFe2O4 is paramagnetic behavior. TiO2 doped NiFe2O4 has higher photocatalytic activity than TiO2 synthesized for degradation of Rhodamine B in aqueous solution under solar light irradiation.
Synthesis and Dielectric Properties of Four-Layered Aurivillius SrBi4Ti4O15 Doped Nd3+ and Mn4+ Sestry Misfadhila; Evi Adhelina; Yestria Rilda; Syukri Arief; Zulhadjri Zulhadjri
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 2 (2015): September
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.2.714.127-134

Abstract

Synthesis of four-layered Aurivillius compound doped with Nd3+ and Mn4+ cations, SrBi3.5Nd0.5Ti4-xMnxO15 (x = 0; 0.5; 1) was carried out using molten salt method with a mixture of Na2SO4/K2SO4 as a flux. The synthesized products were characterized using X-ray diffraction (XRD) and refined by Le Bail technique. The results of XRD analysis show that the four-layered Aurivillius compound formed, however there are additional peaks identified as perovskite and Bi7.68Ti0.32O12.16  phases for x = 0 and perovskite and Sr4Ti3O10phases for x = 0.5 and 1. The results of refinement show that four-layered Aurivillius phase formed has orthorhombic symmetry with A21am space group. Scanning Electron Microscopy (SEM) shows the plate like morphology that are characteristic of Aurivillius compound. Dielectric constant of the samples show increasing value as increasing of Mn4+ concentration.
Review Pembuatan Kokristal Farmasi dengan Metode Mekanokimia Yenti, Revi; Zulhadjri, Zulhadjri; Efdi, Mai; Zaini, Erizal
Majalah Farmasetika Vol 9, No 1 (2024)
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/mfarmasetika.v9i1.48094

Abstract

Pengembangan bahan aktif farmasi saat ini cukup pesat, salah satunya adalah pengembangan kokristal. Kokristal dibuat dengan menggabungkan antara bahan aktif farmasi dan koformernya dengan berbagai metode misalnya pelarutan dan penggilingan. Mekanokimia adalah metode yang efektif untuk persiapan sistem kristal multikomponen. Mekanokimia dianggap sebagai alternatif pendekatan ramah lingkungan karena dilakukan dalam kondisi bebas pelarut atau dengan adanya pelarut dalam jumlah minimal. Artikel review ini dibuat dengan metode instrumen pencarian online terbitan internasional yang akan membahas definisi dan sejarah kokristal farmasi, teknik pembuatan kokristal, sejarah dan definisi mekanokimia, metode mekanokimia pada pembuatan kokristal farmasi, mekanisme metode mekanokimia, serta keuntungan dan kerugian metode mekanokimia. Oleh karena itu pada ulasan ini dijelaskan dan dibahas relevansi prosedur mekanokimia dalam pembentukan kristal multikomponen yang fokus pada kokristal farmasi. Selain itu pada akhir tinjauan ini juga dilaporkan ringkasan makalah ilmiah tentang sintesis mekanokimia kokristal farmasi.
Sintesis Senyawa Aurivillius Ca1-xBi3,5+xLa0,5Ti4-xMnxO15: Struktur dan Sifat Dielektrik Zulhadjri Zulhadjri; Rini Ramadhani; Aulia Arivin Billah; Syukri Arief; Emriadi Emriadi
ALCHEMY Jurnal Penelitian Kimia Vol 14, No 1 (2018): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.14.1.14476.143-151

Abstract

Sintesis senyawa feroelektrik yang berbasis fasa Aurivillius berlapis empat (n = 4) yang didadah kation La3+ dan Mn3+, Ca1-xBi3,5+xLa0,5Ti4-xMnxO15 dengan x = 0, 0,2, 0,4, 0,6, 0,8, dan1 telah dilakukan dengan teknik lelehan garam. Karakterisasi produk dengan difraksi sinar-X (XRD) menunjukkan bahwa fasa tunggal Aurivillius ditunjukkan oleh sampel dengan x = 0, 0,2, 0,4, dan 0,6. Refinement struktur dengan teknik Le Bail diketahui bahwa senyawa Aurivillius yang terbentuk sesuai dengan simetri ortorombik dan grup ruang A21am. Analisis dengan Scanning Electron Microscopy (SEM) untuk semua sampel memperlihatkan morfologi sampel berupa lempengan yang merupakan ciri khas senyawa Aurivillius. Nilai konstanta dielektrik sampel dan konduktivitasnya mengalami kenaikan dengan meningkatnya x. Konduktivitas paling tinggi dimiliki oleh sampel x = 0,2 yang diperkirakan akibat adanya interaksi pertukaran ganda (double exchange) antara Mn3+ dan Mn4+.Synthesis of Aurivillius Compounds Ca1-xBi3,5 + xLa0,5Ti4-xMnxO15: Structure and Dielectric Properties. Synthesis of ferroelectric compounds based on a four-phase Aurivillius phase (n = 4) which is doped with La3+ and Mn3+ cations, Ca1-xBi3,5+xLa0,5Ti4-xMnxO15 with x = 0, 0.2, 0.4, 0.6, 0 , 8, and 1 were carried out by molten salts technique. Characterization of products using X-ray diffraction (XRD) revealed that the single phase Aurivillius was shown by the samples with x = 0, 0,2, 0,4, and 0,6. The results of refinement show that the Aurivillius phase formed has orthorhombic symmetry with A21am space group. Morphology analysis by scanning electron microscopy (SEM) for all samples shows the plate-like as the characteristic of Aurivillius compounds. The value of dielectric constant and conductivity of the samples increases as increase of x. The conductivity of x = 0.2 is the highest predicted due to the interaction of double exchange between Mn3+ and Mn4+.
Synthesis of Aragonite from Precipitated Calcium Carbonate: A Pilot Scale Study Sari, Ellyta; Desmiarti, Reni; Zulhadjri, Zulhadjri; Alif, Matlal Fajri; Rosadi, Maulana Yusup; Arief, Syukri
Indonesian Journal of Chemistry Vol 24, No 6 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.92169

Abstract

The CO2 mineralization pathway is considered a promising option for carbon capture usage and storage because the captured CO2 can be permanently stored, and secondly industrial waste (i.e., petrochemical refinery, lime, and cement kiln dust) can be recycled into value-added carbonate materials by controlling the crystal polymorphs and properties of mineral carbonate. This study investigated the CO2 mineralization utilized for the synthesis of precipitated calcium carbonate (PCC) via low temperatures at 30 °C and 55 °C with the addition of 50 and 75 g/L of ammonium chloride (NH4Cl). The pilot scale of PCC production was established to simultaneously produce PCC with low energy demand by reporting the feasibility of economic analysis and to develop the mineral carbonation that can transform limestones and CO2, which was captured from the petrochemical refinery process into economically valuable PCC. It is found that the aragonite phase of PCC can be generated at a room temperature of 30 °C by adjusting the CO2 flow rate. In addition, the use of NH4Cl, which transformed into ammonium carbonate ((NH4)2CO3) during the calcination process, can maintain the stable aragonite phase by varying the NH4Cl concentration.
Efek Pendoping Nd3+ Pada Senyawa BaBi2-xNdxNb2O9 Terhadap Struktur, Sifat Dielektrik Dan Optik Zulhadjri, Zulhadjri; Hermansyah, Tommy; Septiani, Upita
Jurnal Riset Kimia Vol. 15 No. 2 (2024): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v15i2.690

Abstract

The Aurivillius compound with formula BaBi2-xNdxNb2O9 (x = 0.05, 0.1, 0.2, and 0.4) has been successfully synthesized using the molten salt method, showing potential as a ferroelectric material. The impact of Nd3+ substitution on the structure, morphology, dielectric, and optical properties has been systematically analyzed. XRD data refinement confirms that BaBi2-xNdxNb2O9 (BBNN) exhibits an orthorhombic structure with an A21am space group. Anisotropic plate-like grains were observed across all samples, decreasing their size as Nd3+ content increases. The ferroelectric transition temperature (Tc) decreases due to structural distortion caused by the reduction of the lone pair 6s2 electron effect of Bi3+ when substituted with Nd3+. Moreover, this structural distortion also contributes to an increase in bandgap energy (Eg). The diffuse ferroelectric phase transition is characterized by a broadened Tc peak induced by Nd3+ substitution due to increased cationic disruption in the bismuth layers. The ferroelectric phase with a lower and broader Tc suggests that the x = 0.4 sample has the potential for electrocaloric applications.
Production Precipitated Calcium Carbonate (PCC) using Continuous Stirred Bubble Reactor (CSBR) Sari, Ellyta; Arief, Syukri; Zulhadjri, Zulhadjri; Desmiarti, Reni; Amir, Amelia; Ramadhani, Umi; Agtata, Shazvelia Dwi; Anggreini, Sri
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 3 (2023): December 2023 [Available online since December 26, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i3.27356

Abstract

Precipitated calcium carbonate (CaCO3) has advantages such as small white and fine particle size, high homogeneity, and uniformity of particle shape so it is a product that is much sought after by various types of industry. PCC synthesis must be accompanied by the use of an efficient type of reactor for the reaction. PCC can be synthesized via a carbonation method that utilizes CO2 gas. This research aims to optimize all processes that occur in the PCC production circuit using a CSBR reactor in the form of a tank reactor to optimize the PCC synthesis process from the previous reactor and accommodate the number of tools to be economical. This research aims to optimize all processes that occur in the PCC production circuit using a CSBR reactor in the form of a tank reactor to optimize the PCC synthesis process from the previous reactor and accommodate the number of tools to be economical. Based on the research results, the PCC synthesis process is influenced by the type of solvent, temperature, CO2 gas flow rate, reaction time, and reactor type. The performance of the CSBR reactor was carried out using variations of R1, R2, R3, and R4 using the carbonation method, resulting in the highest purity and yield of 94.6% and 92.08%.
Co-Authors -, Rianda A. A. Nugroho Admin Alif Agtata, Shazvelia Dwi Amelia Amir Amir, Firmanul Qadri Andriani, Nova Anggreini, Sri Aprianti, Dila Kartika Arifah Mustaqimah Aulia Arivin Billah Ayu Sabrina B. Prijamboedi Dila Kartika Aprianti Elan Mulia Ellyta Sari Emriadi - Erizal Zaini Evi Adhelina Firmanul Qadri Amir Gita Rachmad Wibowo Hamsal Yusri Hermansyah Aziz Hermansyah, Tommy Ida Ayu Putu Sri Widnyani Indrawati Indrawati Ismunandar Ismu Luh Putu Ratna Sundari Lusi Puspitasari Mahmud, Marsal Mai Efdi Marniati Salim Marsal Mahmud Matlal Fajri Alif Mulia, Elan N. Mufti Nova Andriani Nurul Pratiwi Nurul Pratiwi Olly Norita Tetra Olyy Norita Tetra Rahmayeni Ramadhani, Umi Reni Desmiarti Rianda - Rianda Rizal Riga Oktry Silpa Rini Ramadhani Rosadi, Maulana Yusup Sabrina, Ayu Sestry Misfadhila Silvi Veronita Solly Aryza Suci Auliya Rahmi Elsya Syukri Arief Syukri Syukri Upita Septiani Upita Septiani Veronita, Silvi Wellia, Diana Vanda Wibowo, Gita Rachmad Wulandari Wulandari Yeni Stiadi Yessi Rahmayani Yestria Rilda Yulia Eka Putri, Yulia Eka Yulizar Yusuf Yusri, Hamsal