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All Journal Jurnal Periodic Jurusan Kimia UNP Biomedika Jurnal Progres Kimia Sains Jurnal Penelitian Pendidikan IPA (JPPIPA) Jurnal Administrasi Pendidikan Indonesia Communications in Science and Technology Chemistry Indonesian Journal of Chemical Research JURNAL PENDIDIKAN TAMBUSAI Eksakta : Berkala Ilmiah Bidang MIPA Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Pelita Eksakta Indonesian Journal of Chemical Science and Technology Entalpi Pendidikan Kimia BIOCHEPHY: Journal of Science Education CHEDS: Journal of Chemistry, Education, and Science Automotive Experiences Journal of Educational Sciences MASALIQ: Jurnal Pendidikan dan Sains Entalpi Pendidikan Kimia Chimica Didactica Acta : Journal of Chemistry and Chemistry Education Journal of Global Research Education Jurnal Pendidikan MIPA
Desy Kurniawati
Jurusan Kimia FMIPA Universitas Negeri Padang
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Social Sciences Other

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Pengaruh Kulit Langsat (Lansium Domesticum) Yang Diimobilisasi Dengan Natrium Silikat Terhadap Penyerapan Ion Logam Zn2+ Dalam Larutan Addawiyah, Nadiyatul; Kurniawati, Desy
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118479

Abstract

Zinc is the fourth most used metal after iron, aluminum and copper and and it pollutes terrestrial and aquatic ecosystems. The primary issue with zinc is that it is non-biodegradable and will build up in water. To overcome this Zn metal, biosorption employs a batch method by using langsat peel immobilized with sodium silicate as a biosorbent, which is more efficient, environmentally friendly, and improves the adsorbent performance in the adsorption process. In this study, the parameters tested were variations in pH, solution concentration, particle size, contact time, and variations in stirring speed. The results showed that the maximum absorption capacity of the metal ion Zn2+ using sodium silicate immobilized langsat peel obtained through the Langmuir isotherm equation was 20.4081 mg/g in optimum state of the adsorption process at pH 4, solution concentration 300 ppm, particle size 150 m, time contact for 90 minutes and the stirring speed of 200 rpm.
Pengaruh Waktu Kontak dan Kecepatan Pengadukan Terhadap Penyerapan Ion Logam Pb2+ Menggunakan Biosorben Kulit Buah Naga Merah (Hylocereus polyrhizus) Fitri, Nur; Kurniawati, Desy
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.119565

Abstract

The Pb2+ ion is the most common and highly toxic metal ion that can be found in industrial waste. if it enters a water body, it will be difficult to degrade and easily accumulate in the body of organisms. This study aims to reduce the impact of Pb2+ ion pollution in the waters. The biosorption method was chosen in batches by utilizing plantation waste, namely dragon fruit peel as a biosorbent in the absorption of Pb2+ ions, because it is cheap, safe, and effective. Dragon fruit peel contains lignin and cellulose which contain active groups so that it ispotential to be used as a biosorbent. The result showed that the dragon fruit peel adsorbent was able to absorb Pb 2+ ions at an optimum contact time 70 minutes with a stirring speed of 200 rpm which was analyzed using an atomic absorption with the highest absorption capacity of 32,74 mg/g.
Pengaruh Variasi Konsentrasi NaOH Terhadap Xerogel dari Kulit Durian (Durio zibethinus Murr.) Anjelia, Mariza; Nasra, Edi; Kurniawati, Desy; Nizar, Umar Kalmar
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124374

Abstract

The objective of this study was to synthesize xerogel from durian peel waste by determining the optimal NaOH concentration for the synthesis process. The sol-gel method was employed, utilizing SiO2 as the main component and Na2SiO3 as the precursor. The sodium silicate precursor was obtained by reacting SiO2 derived from durian shell ash with NaOH solutions of various concentrations: 2 M, 5 M, 8 M, 11 M, and 14 M. The surface area of the resulting xerogel was tested, and the optimal NaOH concentration was found to be 8 M, yielding a surface area of 6637.8 m2/g. The synthesized xerogel was further characterized using FTIR analysis within the wave number range of 4000-600 cm-1. The FTIR data revealed the presence of silanol at a wave number of 3253.30 cm-1 and siloxane at a wave number of 1060.18 cm-1, confirming the successful synthesis of the xerogel.
Sintesis Polianilin (PANI) yang di Doping Besi (III) Oksida Menggunakan Metode Fotopolimerisasi Nofianti, Nora; Ulianas, Alizar; Kurniawati, Desy
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118033

Abstract

This study aims to increase the electrical conductivity of the aniline synthesis product with added dopant. Polyaniline conductive polymer synthesis was carried out with aniline monomer mixed with Ethylene Glycol Dimethacrylate (EGDMA) as crosslinker, Dimethoxy phenylacetophenone (DMPP) as initiator, Fe2O3 as dopant. The polymer results were tested for electrical conductivity using a Four Point Probe (FPP) and characterized by Fourier Transform Infrared (FTIR), Uv-vis DRS (Uv-visible Diffuse Reflectance). the composition that showed the highest conductivity was the addition of Fe2O3 dopant as much as 0.0283 g with an electrical conductivity value of 17.0609 x 10-3 S/cm.
Pengaruh Kecepatan Pengadukan Terhadap Penyerapan Zat Warna Methyelene Blue Oleh Selulosa Dari Limbah Kulit Durian (Durio Zibethinus Murr) Heditama, Muhammad Raffi; Nasra, Edi; Amelia, Fitri; Kurniawati, Desy
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.125359

Abstract

Methylene Blue is a dangerous dye produced in the textile industry. Biosorption can be used as one method to overcome textile dye waste. Biosorption is an easy-to-use method, because it is simpler, more economical, and environmentally friendly. Biosorbents that can be used, namely cellulose in durian peel (Durio zibethinus Murr.) can be used as an alternative to be used as a biosorbent in the absorption of methylene blue dyes. The purpose of this study was to determine the effect of stirring speed on the absorption of Methylene blue dye using cellulose adsorbents. In the study, methylene blue biosorption was carried out using durian peel cellulose biosorbent (Durio zibethinus Murr.) with a batch method at variations in stirring speeds of 50, 100, 150, 200, and 250 rpm. The results of this study obtained a cellulose extract from 90 grams of durian peel the extract resulted in 28.585 grams with a percentage of 31.69%. Results obtained at a speed of 200 rpm obtained an optimum absorption capacity of 25,0948 mg/g.
Optimasi Penyerapan Rhodamin B Menggunakan Biosorben Dari Kulit Buah Matoa Dengan Metode Batch Mutia, Nuraini Cut; Nasra, Edi; Kurniawati, Desy
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118507

Abstract

Research Optimizing the absorption of rhodamine b dye has been carried out using the batch method with biosorbent from matoa skin. This study aims to determine the optimum conditions of each parameter used and determine the value of the absorption capacity of matoa skin against Rhodamine B. Variations in particle size used for biosorption of rhodamine b were 106 µm, 150 µm, 250 µm, and 425 µm, while variations in contact time ranged from 30 minutes to 180 minutes with an interval of 30 minutes. The result of measuring the maximum wavelength of rhodamine b dye using a UV-Vis spectrophotometer is 554 nm with an absorbance value of 0.245. For variations in particle size, the optimum adsorption capacity was 71.08 mg/g at 106 µm, while for variations in contact time, the optimum adsorption capacity was 72.85 mg/g at 150 minutes. In this study, matoa peel has the potential to be used as an alternative biosorbent in the absorption of rhodamine b.
Optimasi Penyerapan Ion Logam Pb2+ Menggunakan Kulit Manggis (Garcinia Mangostana L.) Dengan Matode Batch Husna, Miftahul; Kurniawati, Desy
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124451

Abstract

Pb2+ ion is a metal that is toxic and harmful to the health of the human body and causes mental disorders and can cause environmental pollution. Biosorption is to release heavy metal ions by utilizing various natural ingredients. The purpose of this study was to determine the optimum conditions for mangosteen peel activated with NaOH using variations in particle size, agitation speed and absorption capacity of Pb2+ metal ions using a batch method. The results of this study resulted in optimum conditions for the absorption of Pb2+ ions at a particle size of 180 μm and a stirring speed of 200 rpm with an absorption capacity of 31.25 mg/g. Biosorption using mangosteen peel has been shown to be able to absorb Pb2+ ions using the batch method.
Mikroenkapsulasi Minyak Atsiri Dari Tanaman Nilam (Pogostemon cablin Benth) Sebagai Antijamur Candida albicans Risnawaty, Risnawaty; Nurliana, Laily; Kurniawati, Desy
Indonesian Journal of Chemical Research Vol 4 No 2 (2017): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2017.4-ris

Abstract

Microencapsulation of essential oils from nilam plants (Pogostemon cablin Benth) for antifungal of Candida albicans was carried out. The aims of this study were to know of chemical components, characteristics, and activity test of nilam plants as well as the result test of microencaptulation as antifungal of C. albicans. Nilam essential oils was obtained by using water-vapor destilation with the rendament of 0.88%. Charateristics of nilam essential oils obtained produced are density of 0.947 mg/L, refractive index of 1.506, acid number of 1.122, and dissolved in alcohol 70 and 90% has conducted by Indonesia National Standar. Microencapsulation of nilam essential oils by using spray drying method with the various of the wrapper material of nilam essential oils:maltodextrin (1:12;1:10;1:8) produced solid powders with sticky texture and creamy which giving a spesific aroma of nilam oils. The activity test of antifungal of C. albicans test on liquid essential oil any diffence significantly each various of concentration of 12,5; 25; 50; and 100%. The activity of microcapsule showed that the difference specifically on various of concentrations of 1:12; 1:10 and 1:8 with the good activity power is composition of 1:12. Activity test result showed is any difference significantly between nilam oils and microcapsule.
Characterization of Molecularly Imprinted Polymers (MIPs) as Cholesterol-Absorbing Materials Nadia, Nadia; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49367

Abstract

Molecularly Imprinted Polymer (MIP) membranes as cholesterol absorbers have been successfully synthesized. MIP membranes can absorb cholesterol molecules because they have cavite (pores) and active groups that are selective and sensitive to cholesterol molecules. MIP membranes are synthesized from butyl acrylate monomers, cross-linkers, ethylene glycol dimethacrilate (EGDMA), initiators of 2- 2-dimethoxy-2-phenylacetophenone (DMPP, sodium dodecyl sulfate (SDS) as surfactants, and cholesterol as templates. MIP membranes are synthesized using photopolymerization irradiated with UV light. The results obtained in the form of powder solids can be characterized using UV-Vis spectrophotometry. The results obtained by UV-Vis spectrophotometry showed that the MIP membrane prepared a standard curve with a linear regression equation y = 0.0054x-0.007 with a value of R2 = 0.9982. This suggests that MIP membranes are selective and sensitive to analytes. At optimum absorption of the MIP-cholesterol membrane can absorb cholesterol molecules in the amount of 0.020 grams of cholesterol composition within 20 minutes
Characterization of Silica Nanoparticles from Pumice as an Aerogel Adsorbent Hidayah, Rahma; Kurniawati, Desy; Alizar, Alizar
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 7, No 1 (2024): JANUARY 2024
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v7i1.56435

Abstract

Pumice is often found around the banks of rivers, this stone is a type of igneous rock formed from volcanic eruptions. One of the compounds contained in pumice is silica. Therefore, the synthesis of silica nanoparticles from pumice using the sol gel method was used because it is simpler and more efficient in terms of cost and processing time. the initial step was by reacting pumice powder and NaOH at 70°C - 80°C then synthesized by adding 2M HCI to form a gel or white precipitate, soaking in ethanol, teos, hexane solutions was then synthesized to become an aerogel. Silica synthesis results into silica aerogels were characterized by FTIR and XRF. From FTIR silanol and siloxane functional groups were found, and the SiO2 composition increased to 93,299% after synthesis.
Co-Authors Addawiyah, Nadiyatul Afifi, Rayhanil Afrilia, Yoni Aini, Syamsi Ali Amran Alizar Alizar, Alizar Alkhaira, Nisa Ana, Aziza Putri Andini, Namira Tri Andrean, Maifil Dwi Andromeda Anjelia, Mariza Ardi, Ahmad Maulana Arifah Sri Wahyuni Astuti Barkah, Fitri Annisa Benti Etika, Sri Budhi Oktavia Darussalam, Rahni Darwin Rio Budi Syaka Della Rosalynna Stiadi Dwi Finna Syolendra DWI RAMADHANI Edi Nasra Elsa Yuniarti Elviana Clara Manalu, Volma Em Sutrisna Fadhilah Fadhilah Faradina, Rela Fariz Adzani, Rivaldo Fatmawati, Rani Fauzana Gazali Firanti, Feyges Frilla Fitri Amelia Fitri, Bali Yana Fitria Ningsih, Rahmadhani Frista, Nada Gama Yoga, Nugroho Hafifah, Haifa Hamid, Syafira Putri Haqqu, Annisa Hardeli Hardeli Hardeli Hardianti, Amirah Salsabila Harmaiyani, Risky Hary Sanjaya Hasyim, Rahmat Heditama, Muhammad Raffi Hidayah, Rahma Holidayani Husna, Miftahul Ideal, Flami Luthfianisa Ifan Rivaldo Ikhsany, Diva Indang Dewata Indasyach Moreno, Zavi Intan Lestari Iqbal, Anwar Iryani Iryani Istiqamah, Siti Sarah Iswendi iswendi Jayawarsa, A.A. Ketut Karmila, Aroma Kartika, Reka Khairurrazak, Khairurrazak Kiki Amelia, Kiki Laily Nurliana Latisma, Latisma Lestari, Kardina Mahmud Mahmud Maida, Margarita Claudya Mardhatillah Nadien, Rahmah Mardi Marlini, Rahmida Martha, Rahma Dyan Marthin, Emmilya Febri Mawardi Miftahul Khair Muhammad Rayhan Mulia, Melindra Mutia, Nuraini Cut Nadia Nadia Nandi, Mila Lusy Tri Nizar, Umar Kalmar Nofianti, Nora Nofrianto Nofrianto Novela, Riana Nur Fitri Nurazmi, Suci Nurhayati Nurhayati Nurrahma, Yashinta Oktaviana, Najwa Annisa Parbuntari, Hesty Pasaribu, Nur Rizky Patricia, Popi Permana, Agus Agung Pernadi, Niza Lian Puja, Puja Putra Mustafit, Alvian Putra, Ananda Putri Ana, Aziza Putri Rinjani, Mitna Sekar Putri, Anisa Dwi Putri, Molsa Vitaloka Putri, Raisya Pratama Raden Mohamad Herdian Bhakti Rafael, Muhammad Rahadian Zainul Rahayu Ningsih, Sri Rahmi, Maulidia Arsyta Rantika Putri, Dwi Rara Bahri, Rayhani Riga Rio Budi Syaka, Darwin Risnawaty Risnawaty Risty, Chika Mei Romy Dwipa Yamesa Away Ronald, Meissa Lifangrha Rosalinda, Gigih Devy Safitri, Nadila Sari, Trisna Kumala Sepriyeni Oktavia, Syntia Sherly Kasuma Warda Ningsih Sri Benti Etika Stiadi, Della Rosalyna Sukarno, Ragil Suprawati, Vina Suryani, Okta Syamsul Arifin Tarmizi, Fadhilah Ulianas, Alizar Veronita, Silvi Witri, Rahmi Eka Yeni, Isra Yerimadesi Yerimadesi Yerimadesi Yoga, Nugroho Gama Yohanes Gunawan, Yohanes Yola, Servi Farda Yuranda, Fitri Zakiya, Ratu