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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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PENENTUAN KONDISI OPTIMUM DESORPSI KATION Cd2+ DARI ADSORBEN SILIKA GEL-GPTMS TERMODIFIKASI SULFONAT Afifi, Rayhanil; Oktavia, Budhi; Kurniawati, Desy; Putra, Ananda
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.9592

Abstract

Silica gel mengandung situs aktif berupa gugus silanol (Si-OH) dan siloksan (Si-O-Si), sehingga berguna untuk proses adsorpsi ion logam. Pada penelitian ini silika GPTMS termodifikasi sulfonat digunakan sebagai adsorben kation kadmium. Proses desorpsi dilakukan untuk menghilangkan kation kadmium dari adsorben Silika GPTMS Sulfonat, sehingga adsorben dapat digunakan kembali. Tujuan dari penelitian ini adalah untuk mengetahui kondisi optimal desorpsi ion Cd2+dengan memvariasikan jenis bahan penyerap, konsentrasi, dan laju alir. Hasil penelitian menunjukkan berat adsorpsi sebesar 0,1853 mg dengan persentase 96,81%. Pada proses desorpsi eluen desorpsi terbaik untuk pelepasan Cd2+ adalah CaCl2 0,025M, dengan persentase desorpsi sebesar 96,49% dengan berat terdesorpsi sebesar 0,1787 mg Cd2+. Pada konsentrasi CaCl2 yang divariasikan, kondisi optimum diperoleh pada konsentrasi 0,05 M dengan persentase desorpsi 100% dan berat terdesorpsi sebesar 0,1793 mg Cd2+. Sedangkan pada laju alir, kondisi optimum diperoleh pada 1 mL/menit dengan persentase desorpsi 100%.
PENGARUH VARIASI PELARUT PENCUCIAN ABU TERBANG DAN KONSENTRASI HCL DALAM PROSES GELASI TERHADAP SINTESIS SILIKA XEROGEL Putri, Anisa Dwi; Nasra, Edi; Kurniawati, Desy; Haqqu, Annisa; Nandi, Mila Lusy Tri
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 1 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i1.11124

Abstract

Batubara dimanfaatkan sebagai sumber pembangkit listrik tenaga batu bara (PLTU) melalui pembakaran yang menghasilkan limbah fly ash. Fly ash mengandung berbagai bahan kimia seperti SiO2 ; Al2O3 ; Fe2O3 . Kandungan kimia yang potensial tersebut menjadikan fly ash dapat dimanfaatkan sebagai adsorben logam berat dan zat warna dengan membentuk silika xerogel. Untuk meningkatkan kadar silika oksida pada fly ash dilakukan proses pencucian dengan berbagai pelarut. Hasil yang diperoleh setelah pencucian dengan HNO3 sebesar 55,424%, sedangkan kadar SiO2 pada fly ash setelah pencucian dengan NaOH hanya sebesar 45,551%. Namun kedua hasil tersebut masih berada di bawah kadar SiO2 pada fly ash setelah pencucian dengan HCl pada penelitian sebelumnya yaitu sebesar 56,777%. Netralisasi natrium silikat dengan HCl 3M menghasilkan %yield sebesar 24%; HCl 5M menghasilkan %yield sebesar 68,4%; dan konsentrasi HCl 7M menghasilkan %yield sebesar 80,8%. dengan kadar SiO2 tertinggi pada saat menggunakan HCl 3M mencapai 40,41%.
PENGARUH UKURAN PARTIKEL DAN KECEPATAN PENGADUKAN TERHADAP PENYERAPAN ION LOGAM CU (II) MENGGUNAKAN BIOSORBEN KULIT MATOA (POMETIA PINNATA) Patricia, Popi; Kurniawati, Desy; Nasra, Edi; Mulia, Melindra
CHEDS: Journal of Chemistry, Education, and Science Vol 8, No 2 (2024)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v8i2.9637

Abstract

Pencemaran air oleh logam berat merupakan masalah lingkungan utama yang harus segera diatasi. Salah satu logam berat yang berbahaya adalah logam tembaga (Cu). Pencemaran logam berat pada ekosistem perairan menimbulkan risiko kesehatan yang besar bagi manusia dan membahayakan ekosistem. Hal ini dapat diatasi dengan biosorpsi menggunakan biosorben berupa bahan biologis dari limbah perkebunan. Kulit matoa dapat dimanfaatkan sebagai biosorben karena mengandung gugus fungsi seperti karboksil dan hidroksil yang dapat berikatan dengan ion logam. Penelitian ini bertujuan untuk mengetahui ukuran partikel dan kecepatan pengadukan yang optimum dengan biosorben kulit matoa yang diimobilisasi natrium silika yang diharapkan dapat meningkatkan reaktivitas gugus fungsi dan ketahanan ikatan. Dari penelitian yang dilakukan diperoleh kondisi ukuran partikel optimum adalah 250 µm dengan kecepatan pengadukan 150 rpm dengan kapasitas penyerapan ion logam Cu2+ optimum oleh kulit matoa amobilisasi sebesar 13,13 mg/g.
Pengembangan Media Game Edukasi “Maze Chase” Berbantuan Google Site Dan Wordwall Pada Materi Struktur Atom Fase E SMA/MA Holidayani; Alizar; Kurniawati, Desy; Riga
Journal of Global Research Education Vol. 3 No. 1 (2025)
Publisher : Akademi Akuntansi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62194/52cngm10

Abstract

Penelitian ini bertujuan untuk menentukan validitas dan praktikalitas sarana pembelajaran game edukasi "maze chase" yang dikembangkan dengan dukungan google site dan wordwall pada topik struktur atom fase E SMA/MA dengan menggunakan model plomp. Studi ini dilakukan sampai tahap validitas dan praktikalitas. Penelitian ini dilakukan di FMIPA UNP dan SMA N 1 Luhak Nan Duo. Tiga dosen kimia FMIPA UNP dan dua pengajar di SMA N 1 Luhak Nan Duo menjadi subjek uji validitas. SMAN 1 Luhak Nan Duo melakukan uji praktikalitas dengan dua guru kimia dan dua belas siswa kelas X fase E. Kuesioner validitas dan praktikalitas digunakan. Uji praktikalitas dan validitas diuji dengan presentase skor capaian praktikalitas produk. Validitas diuji dengan formula Aikens'V. Hasil penilaian penelitian menunjukkan bahwa nilai Aikens'V untuk aspek isi senilai 0,95, aspek kebahasaan senilai 0,90, aspek penyajian senilai 0,93, dan aspek grafik senilai 0,95, yang semuanya menunjukkan kategori valid. 2. Guru dan siswa masing-masing memiliki nilai praktisitas 99% dan 92%, masing-masing. Hasil penelitian menunjukkan bahwa metode pembelajaran game edukasi "maze chase", yang digunakan pada topik struktur atom fase E SMA/MA dengan dukungan situs web Google dan wordwall, sudah valid dan sangat praktis dan dapat diterapkan. Oleh karena itu, penelitian ini dapat dilanjutkan ke fase penelitian berikutnya untuk menguji efektivitasnya
Experimental investigation of a thermoelectric generator assisted with heat pipe sinks for pickup car exhaust waste heat recovery Sukarno, Ragil; Indasyach Moreno, Zavi; Rio Budi Syaka, Darwin; Gunawan, Yohanes; Gama Yoga, Nugroho; Fariz Adzani, Rivaldo; Putra Mustafit, Alvian; Kurniawati, Desy
Communications in Science and Technology Vol 10 No 1 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.1.2025.1661

Abstract

In internal combustion engine vehicles (ICEV), about 40% of the heat is discharged into the environment as waste heat. This study proposed to develop an energy recovery device to utilize exhaust heat as electrical energy using a thermoelectric generator (TEG) assisted with a heat pipe sink. Six TEG units were installed on the stainless-steel heat block in an exhaust pipe where each TEG unit varied with one-stage TEG and two-stage TEG modules. The results showed that the maximum power generated and TEG efficiency of 1.4 W and 1.14% were obtained under 180oC of exhaust pipe temperature, with a two-stage TEG with a heat pipe sink under forced convection. The use of a heat pipe sink and under-forced convection improves the TEG system's performance by increasing the temperature difference between both sides of the TEG module, which impacts the electric power generated. This research provides some practical guidance for increasing the power and efficiency of TEGs by improving heat transfer performance through heat pipes.
Pengaruh Ukuran Partikel Kulit Lengkeng (Dimocarpus longan) yang Termodifikasi CTAB Terhadap Adsorpsi Ion Logam Pb(II) Putri Rinjani, Mitna Sekar; Kurniawati, Desy; Alizar, Alizar; Sari, Trisna Kumala
Periodic Vol 14, No 2 (2025): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v14i2.132982

Abstract

Study This aiming For analyze material characteristics using Spectroscopy Infrared Fourier Transform (FT-IR) and measure size particle . The FT-IR method is used For identify group function And component chemistry in sample , while analysis size particle done For determine distribution And morphology particle . Objective study This is For increase efficiency adsorption through modification surface biosorbent using CTAB. FT-IR results show existence peaks spectrum indicating existence bond chemistry certain , which provides outlook about material structure . Capacity maximum obtained at pH 6, concentration 250 ppm, time 60 minutes contact , and size 180 µm particles . research This show that peel modified longan with CTAB having potential tall For used as biosorbent effective in processing waste metal heavy.
Innovative Pickup Car Cooling System Based on Thermoelectric Coupled With Heat Pipe Sink Sukarno, Ragil; Rafael, Muhammad; Yoga, Nugroho Gama; Syaka, Darwin Rio Budi; Permana, Agus Agung; Gunawan, Yohanes; Kurniawati, Desy
Automotive Experiences Vol 8 No 2 (2025)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/ae.13494

Abstract

Pickup cars are one of the most important means of transportation in the distribution of goods and logistics. However, many customers choose pickup cars without air conditioning because they are less expensive and more energy-efficient, resulting in lower operating costs. Car air conditioning systems generally utilize vapor compression systems, which consume a significant amount of energy. Additionally, some studies on thermoelectric cooling face challenges due to incompatible and difficult-to-install designs within vehicle cabins. To address this issue, this research was conducted on developing an innovative compact air conditioning (AC) system for the cabin of a pickup car. This system utilizes thermoelectric cooling (TEC) combined with a heat pipe sink. This cooling system features a practical and installation-friendly design compared to previous work, which can be integrated into existing pickup models without significant modifications. It is designed as a cooling box that generates and circulates cold air within the cabin. In this testing, the cooling box comprises six-unit thermoelectric cooling, where each unit varies using one-stage TEC modules and two-stage TEC modules. A 175-watt and 200-watt heat was applied and varied in the cabin to simulate the cooling load, and the air outlet duct's velocity also varied at 2 m/s and 3 m/s. The results showed that the thermoelectric cooling systems can significantly reduce cabin temperature increases, lowering the rise by 11.0 °C for a single-stage TEC system and by 10.8 °C for a double-stage TEC system compared to the cabin without a cooling system. The highest COP value of 1.4 was obtained in the single-stage TEC cooling system at a velocity of 3 m/s. The results show the potential of an innovative thermoelectric cooling (TEC) system when combined with heat pipes, offering an alternative cooling solution for the cabin of a pickup car. This proposed cooling system can be adapted for vehicles that require compact and energy-efficient cooling solutions.
Formulasi Masker Wajah Organik dengan Kunyit: Studi pH, Kadar Air, dan Aktivitas Antioksidan Nurazmi, Suci; Mawardi, Mawardi; Kurniawati, Desy
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6824

Abstract

This study is motivated by the limited research on the formulation of organic masks using locally sourced natural ingredients such as coffee grounds, rice flour, and turmeric, which hold potential for producing cosmetic preparations with high bioactive efficacy and safety. The objective of this research is to analyze the effect of turmeric addition on the chemical characteristics of organic facial masks made from coffee grounds and rice flour, with a focus on pH level, moisture content, antioxidant activity, and flavonoid content. A quantitative approach was employed through laboratory experiments involving two formulations (with and without turmeric), each tested in triplicate. pH was measured using a digital pH meter; moisture content was determined by the gravimetric method; antioxidant activity was assessed using the DPPH method with a UV-Vis spectrophotometer; and flavonoid content was evaluated qualitatively. The results show that the formulation containing turmeric had a more neutral pH (7.3), lower moisture content (3.11%), higher antioxidant activity (47.50%), and tested positive for flavonoid content. In contrast, the formulation without turmeric had higher moisture content (3.68%) and did not contain flavonoids. The addition of turmeric also influenced drying time, though it remained within an optimal range. The study concludes that turmeric addition significantly enhances the chemical quality and biofunctional activity of the mask, representing an innovative approach to developing herbal cosmetics based on local ingredients.
Optimasi Waktu Kontak dan Kecepatan Pengadukan untuk Penyerapan Ion Cu(II) oleh Biosorben Kulit Matoa-CTAB Ronald, Meissa Lifangrha; Kurniawati, Desy; Mulia, Melindra
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6867

Abstract

Industrial waste containing heavy metal ions such as Cu(II) is a major cause of environmental pollution, posing serious risks to human health and ecosystem sustainability. Cu(II) ions are toxic and can lead to neurological disorders, anemia, liver and kidney damage, and even death upon excessive exposure. To address this issue, an efficient, economical, and environmentally friendly method is needed. This study aims to evaluate the ability of matoa peel as a biosorbent for Cu(II) ion removal and to analyze the effect of surface modification using the cationic surfactant Cetyltrimethylammonium Bromide (CTAB). Matoa peel was selected due to its status as agricultural waste rich in active compounds such as flavonoids, tannins, lignin, and cellulose, which contain functional groups effective in binding metal ions. CTAB modification was applied to enhance the number and strength of active adsorption sites. Characterization was conducted using Fourier Transform Infrared Spectroscopy (FTIR) to identify changes in functional groups, while adsorption tests were performed using Atomic Absorption Spectroscopy (AAS) with variations in contact time and stirring speed. The results indicated optimal conditions at 60 minutes of contact time and a stirring speed of 150 rpm, achieving a maximum adsorption capacity of 15.01 mg/g—significantly higher than that of the unmodified biosorbent. In conclusion, CTAB-modified matoa peel significantly enhances the biosorption effectiveness for Cu(II) ions. These findings support the potential use of agricultural waste as a sustainable, cost-effective biosorbent for environmentally friendly industrial wastewater treatment.
Pengaruh pH dan Kecepatan Pengadukan terhadap Penyerapan Zat Warna Methylene Blue menggunakan Biosorben Kulit Langsat (Lansium domesticum) Termodifikasi Cetyltrimethylammonium Bromide (CTAB) Oktaviana, Najwa Annisa; Kurniawati, Desy
MASALIQ Vol 5 No 5 (2025): SEPTEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i5.7079

Abstract

Textile dye waste such as Methylene Blue is a hazardous pollutant that is difficult to degrade, thus requiring environmentally friendly treatment solutions. This study aims to utilize langsat peel waste (Lansium domesticum) modified with the cationic surfactant Cetyltrimethylammonium Bromide (CTAB) as a low-cost biosorbent for the removal of Methylene Blue, with a focus on improving adsorption capacity and examining the effects of process variables, namely pH and stirring speed. The langsat peel was prepared, ground to a particle size of 150 µm, and modified with CTAB. Batch adsorption experiments were conducted by varying the pH (2–10) and stirring speed (100–300 rpm). The concentration of Methylene Blue was analyzed using a UV-Vis spectrophotometer. The results showed that the optimal adsorption occurred at pH 6 with a capacity of 5.57 mg/g, while the optimal stirring speed was 200 rpm, yielding the highest adsorption capacity of 17.9 mg/g. These findings demonstrate that CTAB-modified langsat peel significantly enhances its effectiveness as a potential biosorbent for the remediation of Methylene Blue-containing wastewater.
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 Anjelia, Mariza Arifah Sri Wahyuni 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 Fariz Adzani, Rivaldo Fatmawati, Rani Fauzana Gazali Fitri Amelia Fitri, Bali Yana Fitria Ningsih, Rahmadhani Frista, Nada Gama Yoga, Nugroho 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 Silpa, Riga Oktry 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