Garuda - Garba Rujukan Digital

p-Index From 2020 - 2025

2.589

P-Index

This Author published in this journals

All Journal JURNAL PIJAR Jurnal Lembaga Penelitian Universitas Mataram Transformasi: Jurnal Pengabdian Masyarakat Jurnal Penelitian Pendidikan IPA (JPPIPA) ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Pengabdian Magister Pendidikan IPA Indonesian Physical Review Acta Chimica Asiana Jurnal Warta Desa (JWD) Prosiding Konferensi Nasional PKM-CSR Jurnal Pijar MIPA Jurnal Pepadu Jurnal Pendidikan dan Pengabdian Masyarakat Jurnal Pengabdian Inovasi Masyarakat Indonesia

Saprini Hamdiani

Department Of Chemistry, Faculty Of Mathematics And Natural Science, University Of Mataram, Indonesia

Author-ID : 273438

Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Environmental Science Materials Science & Nanotechnology Mathematics Nursing Physics Public Health Social Sciences Other

Published : 37 Documents Claim Missing Document

Claim Missing Document

Articles

1 2 3 4

Adsorpsi Metanil Yellow Menggunakan Karbon Aktif Limbah Cangkang Buah Kawista (Limonia Acidissima L.) Dina Asnawati; Sri Seno Handayani; Siti Raudhatul Kamali; Saprini Hamdiani; Iwan Sumarlan; Made Ganesh Darmayanti; Lala Ghina Aulia
Jurnal Pijar Mipa Vol. 15 No. 3 (2020): Juni
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Tujuan dari penelitian ini adalah untuk mengetahui karakteristik arang aktif serta kondisi optimum adsorpsi zat warna metanil yellow oleh arang aktif limbah cangkang buah kawista yang meliputi massa adsorben, waktu kontak, suhu dan pH. Arang aktif dibuat melalui proses aktivasi secara kimia yaitu dengan menggunakan zat aktivator HCl 1 M. Untuk mendapatkan arang aktif dengan karakteristik yang baik ditinjau dari kadar air, kadar abu dan kadar zat menguap. Hasil penelitian menunjukkan bahwa arang aktif limbah cangkang buah kawista yang diaktivasi dengan HCl 1 M menghasilkan arang aktif dengan karakteristik yang memenuhi standar baku mutu SNI 06-3730-1995, yaitu dengan kadar air 6,3%, kadar abu 9%, dan kadar zat menguap 3%. Hasil analisis dengan spektrofotometer FTIR menunjukkan bahwa arang aktif tersebut mempunyai gugus fungsi OÃ¢â¬âH pada 3435,13 cm-1 dan C=C pada 1621,22 cm-1. Limbah cangkang buah kawista dapat digunakan sebagai adsorben dengan kapasitas adsorpsi sebesar 5,48 mg/gram pada kondisi optimum yaitu massa 1 gram selama 90 menit dengan suhu 80 ÃÂ°C dan pH 7 (netral). ÃÂ ÃÂ Kata Kunci: Adsorpsi, metanil yellow, arang aktif, cangkang buah kawista, HCl

Theoretical Study on Corrosion Inhibition Properties of 2-Isopropyl-5-Methylphenol Saprizal Hadisaputra; Saprini Hamdiani; Eka Junaidi
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.11.2.710.102-110

Corrosion inhibitors of 2-isopropyl-5-methylphenol and its derivatives has been elucidated by means of density functional theory at B3LYP/6-31G(d) level of theory. Effect of electron donating and withdrawing groups such as NH2, SH, CHCH2, CH3, OH, CHO, COOH, F and NO2 on the corrosion inhibitor of 2-isopropyl-5-methylphenol derivatives also have been studied. The quantum chemical parameters such as the frontier orbital energies (EHOMO), ionization potential (I), electron affinity (A) and electronegativity (χ) are closely related to the corrosion inhibition efficiency (IE %) of 2-isopropyl-5-methylphenol derivatives. The presence of electron donating groups increase IE % values meanwhile electron with drawing groups reduce IE % values. The enhancement of IE % follows NO2 < CHO < COOH < SH < F < CH3 < CHCH2 < OH < NH2. Electron donating NH2 group gives 96.38 % of IE %, pure 2-isopropyl-5-methylphenol IE % = 82.70 %. In contrast, electron withdrawing NO2 group gives IE % only 68.66 %. This theoretical study would have a significantly contribution for accelerating corrosion inhibitor experimental to gain optimum results.

Methylation of Eugenol Using Dimethyl Carbonate and Bentonite as Catalyst Dina Asnawati; I Made Sudarma; Emmy Yuanita; Baiq Fadila Arlina; Saprini Hamdiani; Siti Raudhatul Kamali
Indonesian Journal of Chemistry Vol 15, No 3 (2015)
Publisher : Universitas Gadjah Mada

Eugenol is a compound with a variety of reactive functional groups such as allyl, hydroxy and methoxy. The presence of the functional groups brings eugenol possible to undertake the transformation into various derivative compounds with diverse activities. One of the simple and possible transformations is methylation or alkylation. Commonly, methyl halides and dimethyl sulphate are used as methylation agent. However, those kinds of methylation agents are toxic and carcinogenic. In this research dimethyl carbonate, an alternative methylation agent is used, because of its low toxicity, green, and economic. The synthesis has been carried out by using a catalyst. Bentonite was activated by heating to a temperature using 300 °C. Methylation was shown by the formation of a light yellow liquid (25.71% yield). The structures of products were characterized by GC-MS and obtained a compound, namely bis eugenol (4-allyl-2-methoxyphenoxy) methane (2.37% yield).

SYNTHESIS OF MESOPOROUS METHYL-SILICA HYBRID FOR ADSORPTION OF ALIZARIN RED-S Bambang Rusdiarso; Eko Sri Kunarti; Saprini Hamdiani
Indonesian Journal of Chemistry Vol 8, No 2 (2008)
Publisher : Universitas Gadjah Mada

Mesoporous methyl-silica hybrid has been synthesized through sol-gel process, by using tetraethylorthosilicate and methyltriethoxysilane as precursors and tartaric acid as a template. The adsorbent was applied to study the adsorption of alizarin red-S. The preparation of methyl-silica hybrid was carried out at various mol ratios of precursors and tartaric acid concentration. The methyl-silica hybrid result was characterized by infrared spectroscopy, X-ray diffraction, and surface area analyzer. Adsorption experiment was conducted to study the effect of pH and Alizarin Red-S concentration on the adsorption capacity of the adsorbent. The adsorbed Alizarin Red-S was calculated from different of Alizarin Red-S concentration before and after adsorption based on the analysis with UV-Vis method. Characterization with Infrared Spectroscopy showed that methyl-silica hybrid has been successfully synthesized as indicated by appearance of characteristic functional group vibrations i.e Si-C, silanol (Si-OH) and siloksan (Si-O-Si). The X-ray diffraction data showed amorphous structure of methyl-silica Hybrid. The Surface Area Analyzer analysis data showed that the pore diameter and surface area of methyl-silica hybrid tended to increase as the template concentration increases. Adsorption study of methyl-silica hybrid showed that the adsorption decreased as the pH was increased. The optimum adsorption was obtained at pH=2.0 with the concentration of Alizarin Red-S of 70 mg/L.

Influence of Macrocyclic Ring Size on the Corrosion Inhibition Efficiency of Dibenzo Crown Ether: A Density Functional Study Saprizal Hadisaputra; Saprini Hamdiani; Muhammad Arsyik Kurniawan; Nuryono Nuryono
Indonesian Journal of Chemistry Vol 17, No 3 (2017)
Publisher : Universitas Gadjah Mada

The effect of macrocycle ring size on the corrosion inhibition efficiency of dibenzo-12-crown-4 (DB12C4), dibenzo-15-crown-5 (DB15C5), dibenzo-18-crown-6 (DB18C6), dibenzo-21-crown-7 (DB21C7) and dibenzo-24-crown-8 (DB24C8) have been elucidated by mean of density functional calculation at B3LYP/6-31G(d) level of theory in the gas and aqueous environment. The quantum chemical parameters including the frontier orbital energies (EHOMO, ELUMO), ionization potential (I), electron affinity (A), the absolute electronegativity (χ), hardness (η), softness (σ), and the fraction of electron transferred (ΔN) are positively correlated to the corrosion inhibition efficiency (IE%) of the studied crown ethers. The calculation results indicate that DB24C8 exhibits the highest corrosion inhibition efficiency, whereas DB12C4 exhibits the lowest corrosion inhibition efficiency. The results of this study will contribute to design crown ethers potential as corrosion inhibitors.

A Green Method for Synthesis of Silver-Nanoparticles-Diatomite (AgNPs-D) Composite from Pineapple (Ananas comosus) Leaf Extract Saprini Hamdiani; Yeng-Fong Shih
Indonesian Journal of Chemistry Vol 21, No 3 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.63573

This study aims to develop a green method to load silver nanoparticles (AgNPs) into the diatomite (D) pores to produce AgNPs-D composite material. The AgNPs were synthesized by pineapple leaf extract at the temperature of 70 °C for 30 min. The composite formation was characterized by UV-Vis, FTIR, TGA, particle sizes analysis, gravimetric, and color observation. The appearance of surface plasmon bands in 440–460 nm confirms the AgNPs formation. The percentage of the AgNO3 which converted to AgNPs was 99.8%. The smallest particle size of AgNPs was 30 nm, obtained in an AgNO3 concentration of 1 mM with a stirring time of 24 h at 70 °C. The colloidal AgNPs were stable for up to 7 days. The adsorption process of AgNPs was marked by the appearance of –C=O and –C–O– groups peak at 1740 and 1366 cm–1 on the FTIR spectrum. By adsorption and gravimetric technique, as much as 1 wt.% of AgNPs were loaded into D pores. The color of diatomite material changes from white to reddish-brown. The TGA analysis showed that the remaining D and AgNPs-D at 580 °C are 98.22% and 95.74%, respectively. The AgNPs loading through the green technology technique was expected to increase diatomite application in the biomedical field.

Influence of Different Kinds of Plant Fibers on the Curing Kinetics of Epoxy Resin Yeng-Fong Shih; Jia-Yi Xu; Nian-Yi Wu; Ting-Yuan Ou; Saprini Hamdiani
Indonesian Journal of Chemistry Vol 22, No 1 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.66771

The curing kinetics of the epoxy resin crosslinked by an anhydride hardener with and without plant fibers was investigated. The epoxy composites containing modified pineapple leaf fiber (EASF), banana fiber (EBSF), and bamboo chopsticks fibers (ECSF) were analyzed by non-isothermal differential scanning calorimetry (DSC) technique. Dynamic methods were used to predict the total heat of reaction of the epoxy resin and its activation energy based on the methods of Kissinger and Ozawa. The results showed that, at a low heating rate (5 °C/min), the ΔH of the pure epoxy, EASF, EBSF, and ECSF were 326.2, 307.6, 295.6, and 366.6 J/g, respectively. The curing rate increased, and the activation energy was decreased due to the catalytic role of hydroxyl groups of plant fibers. Based on Kissinger and Ozawa methods, the calculation of activation energy for pure epoxy was 70.08 kJ/mol and 73.21 kJ/mol, EBSF was 68.07 kJ/mol and 71.41 kJ/mol, ECSF was 60.11 kJ/mol and 63.87 kJ/mol, and EASF was 58.71 kJ/mol and 62.49 kJ/mol. The activation energy for the three kinds of epoxy composite modified fibers was less than pure epoxy resin due to the gel effect resulting from the higher viscosity, faster curing rate, and steric hindrance.

Copper Corrosion Protection by 4-Hydrocoumarin Derivatives: Insight from Density Functional Theory, Ab Initio, and Monte Carlo Simulation Studies Saprizal Hadisaputra; Agus Abhi Purwoko; Saprini Hamdiani
Indonesian Journal of Chemistry Vol 22, No 2 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.69530

The corrosion inhibition performance of 4-hydrocoumarin derivatives has been studied using weight loss, electrochemical impedance spectroscopy, potentiodynamic polarization, and electrochemical frequency modulation techniques. However, experimental studies have not explained why the methoxy (OCH3) group contributes more to the increase in corrosion inhibition than the methyl (CH3) and chlorine (Cl) functional groups. In this theoretical study, the electronic aspect of the target corrosion inhibitors will be studied in detail to help strengthen the explanation in the experimental research. Density functional theory, ab initio, and Monte Carlo simulations have been used to analyze the corrosion inhibition performance of 4 curcumin derivatives against copper. The quantum chemistry approach is carried out under gas and aqueous conditions in neutral and protonated inhibitors. The Monte Carlo simulation was used to observe the dynamics and the mechanism of inhibition of the target molecule on the copper surface. The quantum chemistry approach can mimic the geometrical parameters of molecular inhibitors. It can also explain electronically why the OCH3 functional group is superior to other substituents. The adsorption energy of the 4-hydroquinone derivative is linearly correlated with the reported experimental study. The level of corrosion inhibition efficiency is OCH3 > CH3 > H > Cl.

PENGENALAN KODE RESIN PLASTIK PADA SISWA MENENGAH ATAS UNTUK MEMBANGUN GENERASI PEDULI LINGKUNGAN Sudirman Sudirman; Dina Asnawati; Iwan Sumarlan; Ganesh Darmayanti; Siti Raudhatul Kamali; Saprini Hamdiani
Jurnal Warta Desa (JWD) Vol. 1 No. 3 (2019): Jurnal Warta Desa (JWD)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat Universitas Mataram

Pegunaan dan penanganan sampah plastik sangat bergantung pada jenis plastiknya. Setiap plastik telah tercantum kode resin yang menunjukan jenis resin plastik tersebut serta bagaimana penggunaan dan penanganannya. Meski demikian, fakta di masyarakat belum mengenal kode resin tersebut. Sejumlah 91.42% responden Siswa SMA Tegar Kelana mengaku tidak tahu tentang plastik. Selain itu, dari data diperoleh penangan sampah yang dilakukan oleh masyarakat disekitar sekolah khususnya sampah plastik masih lebih banyak dengan cara dibakar dan dibuang ketempat pembuangan begitu saja. Setelah dilakukan sosialisasi kode resin plastik pada siswa SMA Tegar Kelana Desa Suranadi, respon siswa sangat antusias. Sejumlah 98.04% respondent yang diuji telah berhasil dengan tepat memilah jenis plastik berdasarkan kode resinnya. Selain itu, hamper keseluruan responden menginginkan adanya kegiatan lebih lanjut.

Theoretical study on the binding selectivity of 18-membered azacrown ethers with alkaline earth metal species Saprini Hamdiani; Lalu Rudyat Telly Savalas; Agus Abhi Purwoko; Saprizal Hadisaputra
Acta Chimica Asiana Vol. 1 No. 1 (2018)
Publisher : Chemistry Education Program, the University of Mataram

The binding selectivity of 18-membered azacrown ethers (monoaza- N1, diaza- N2, triaza- N3, tetraaza- N4, pentaaza- N5, and hexaaza-18-crown-6 N6) with Ca2+, Sr2+, Ba2+ have been studied by density functional theory (DFT) calculations. The complex binding selectivity was analyzed in term of interaction energies, thermodynamic properties, second order interaction energies, and charge transfer effects. The geometrical study shows that Ca2+ and azacrown complexes acquire envelope like structure, leading to shorter bond lengths. As a result, these complex systems have the highest interaction energies. Theoretical study also showed that N6 complex with alkaline earth metal ion were shown to be more stable complex than those ligand with lower nitrogen number. The interaction energy order is N0 < N1 < N2 < N3 < N4 < N5 < N6. This trend shows that the presence of more nitrogen on the crown ether cavity increases the interaction energies by approx. 7.3 % in going from N0 to N6. It is clearly showed that the contribution of the number of nitrogen play a dominant role in the binding selectivity of these systems.

Co-Authors Agus Abhi Purwoko Agus Abhi Purwoko Agus Abhi Purwoko Akram La Kilo Anshori, Mufid Ariessaputra, Suthami Arisanti, Ivon Azzauri, Supyan Baiq Fadila Arlina Bambang Rusdiarso Bambang Rusdiarso Bambang Rusdiarso Dhony Hermanto Dina Asnawati Eka Junaidi Eko Sri Kunarti Emmy Yuanita Emmy Yuanita Faturrahman Ganesh Darmayanti Hidayatullah, M. Riski I Made Sudarma I MADE SUDARMA Indriyatno Iriando, Mahadi Muhammad Gunadharma Iwan Sumarlan Jafar La Kilo Jannatin Arduha Jia-Yi Xu Lala Ghina Aulia Lalu Rudyat Telly Savalas Lalu Rudyat Telly Savalas Lely Kurniawati Lely Kurniawati Lely Kurniawati Made Ganesh Darmayanti Mamika Ujianita Romdhini Mamika Ujianita Romdhini Mamika Ujianita Romdhini, Mamika Ujianita Mariana, Baiq Marliadi Susanto Muhammad Arsyik Kurniawan Murniati Murniati Nian-Yi Wu Niza Yusnita Apriani Nurul Ismilayli Nurul Ismilayli, Nurul Nurul Ismillayli Nuryono Nuryono Nuryono Nuryono Nuryono Nuryono Pidia Aulia Putri Elsa Putri Jauhar Prihatini Rifia Wulandari Ruru Honiar Saprizal Hadisaputra Saprizal Hadisaputra Saral Dwi Miftiyati Sari, Ayu Purnama Siti Raudhatul Kamali Siti Raudhatul Kamali Siti Raudhatul Kamali Sri Seno Handayani Sudirman Sudirman Sudirman Sudirman Sudirman Sudirman Surya Hadi Ting-Yuan Ou Ulul Khairi Zuryati Ulul Khairi Zuryati Wardian Antoni Wirahadi, Ahmad Yeng-Fong Shih Yunia Maulida

Title

Found 37 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 37 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 37 Documents
Search