Article Per Year (5 Year)
p-Index From 2021 - 2026
9.386
P-Index
This Author published in this journals
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

Published : 83 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 83 Documents
Search

 1   2   3   4   5 
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 6, No 2 (2023): JULY 2023
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v6i2.49368

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.
Effect of Contact Time and Stirring Speed on Biosorption of Lead (II) Using Sugarcane Bagasse Pasaribu, Nur Rizky; Kurniawati, Desy
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.v7i1.56443

Abstract

Lead is a hazardous and toxic metal if it reaches human organs in sufficient doses or if it is present in water. Pb2+ can build up in the brain, causing cancer, disorders of nerve cells, kidneys and mental health as well as problems with male reproduction and resulting in bone irregularities in children. As a result, it is vital to regulate the presence of this metal in water. Biosorption is a heavy metal removal technique that use biomass as an adsorbent. The biosorption method was conducted in this study employing sugarcane bagasse as an adsorbent and batch contacting. Variations in contact duration and stirring speed were tested in this study to determine the influence of contact time and stirring speed on the biosorption process. The study's findings revealed that a contact duration of 60 minutes and a stirring speed of 100 rpm were the best conditions in this research.
Pengaruh Ukuran Partikel dan Laju Alir Terhadap Penyerapan Ion Zn(II) Menggunakan Kulit Langsat (Lansium domesticum) sebagai Biosorben Lestari, Kardina; Kurniawati, Desy; Alizar, Alizar; Putra, Ananda
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125515

Abstract

Zn2+ is a harmful ion generated from industrial waste that must be overcome. Zn (II) absorbed in excess conditions can interfere with body health and cause system dysfunction. Metal ion absorption is carried out using langsat fruit peel biosorption. Langsat fruit peel contains active functional groups that have the potential as a binding agent for Zn2+ metal ions. This study aims to determine the optimum conditions for the absorption of Zn2+ ions using langsat fruit peel on the effect of particle size and flow rate on the column. the results showed that the biosorbent was able to absorb Zn ions of 12.2994 mg/g at a particle size of 106 micro and 12.6275 mg/g at a flow rate of 1 ml/min. this shows that langsat fruit peel is one of the best biosorbents in absorbing metals with large absorption capacity data.
Pengaruh Ukuran Partikel dan Laju Alir Terhadap Biosorpsi Ion Cu(II) Menggunakan Biosorben Kulit Langsat (Lansium domesticum) Hardianti, Amirah Salsabila; Kurniawati, Desy; Etika, Sri Benti; Sanjaya, Hary
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125611

Abstract

Cu2+ ion is a dangerous metal ion produced from various industrial wastes that need to be addressed. Excess and high concentrasions of absorbed Cu2+ ions can disrupt health and ecosystems because they are difficult to degrade and easily accumulate in the body. This study aims to determine the optimum conditions for the absorption of Cu2+ ions using langsat fruit peel on the effect of particle size and flow rate by column method. Adsorption of Cu metal ions with langsat fruit peel biosorbent obtained optimum conditions at adsorbent particle size of 150 micrometers with adsorption capacity of 13,963 mg/g and flow rate of 1 mL/minute with adsorption capacity of 13,442 mg/g. This shows that langsat fruit peel is one of the best biosorbents in absorbing metals with large absorption capacity data.
Pengaruh Laju Alir Terhadap Penyerapan Ion Logam Cd2+ Menggunakan Biomassa Kulit Langsat (Lansium domesticum) dengan Metode Kolom Ideal, Flami Luthfianisa; Kurniawati, Desy; Mawardi, Mawardi; Hardeli, Hardeli
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125540

Abstract

Increasing industrial activities have a negative impact on the ecosystem. One of them is environmental pollution. Heavy metals can be found in industrial waste whose presence can endanger living things around the industrial environment. Overcoming the presence of heavy metal ions in industrial waste can be done by biosorption methods. Biosorption is one of the strategies that can be utilized to adsorb heavy metal levels contained in wastewater. Langsat shell was used as biomass to adsorb Cd2+ metal ions using column method.  This study was conducted to determine the effect of flow rate on the absorption of Cd2+ metal ions. The results showed that the optimal absorption of Cd2+ metal ions by langsat shell occurred at a flow rate of 1 mL /  min with an absorption capacity of 16.5425 mg/gram.
Pengembangan E-LKPD Berbasis Inkuiri Terbimbing pada Materi Asam dan Basa untuk Kelas IX SMA/MA Zakiya, Ratu; Kurniawati, Desy
Entalpi Pendidikan Kimia Vol 5 No 2 (2024)
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/epk.v5i2.473

Abstract

One of the innovations in developing teaching materials that utilize technology and learning approaches is to modify printed LKPD into electronic form which is prepared using a learning model. This research aims to develop a valid and practical guided inquiry-based E-LKPD on acid and base subject for class XI SMA/MA. The type of research used is design research with a plomp development model. The results of this research show that the E-LKPD developed is valid and practical. The average content validity value of E-LKPD is 0.85 with a valid category and the average construct validity value of E-LKPD is 0.85 with a valid category. The average value of practicality analysis is 92% for teacher practicality in the very practical category and 88% for students' practicality in the very practical category.
ANALYSIS OF FACTORS INFLUENCING INTERNATIONAL STUDENTS' SATISFACTION IN HIGHER EDUCATION Nurrahma, Yashinta; Rosalinda, Gigih Devy; Kurniawati, Desy
Jurnal Administrasi Pendidikan Vol 21, No 1 (2024): APRIL 2024
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/jap.v21i1.63940

Abstract

This research aims to analyze whether there is a significant relationship between the variables of Teacher Expertise, Courses Offered, Learning Environment, and Facilities toward the satisfaction of international students in the Non-Degree and Full Degree programs at University X. The research sample consisted of 92 international students, and data collection was conducted through an online questionnaire poll. The research methodology used was the Partial Least Square (PLS) statistical technique, which includes two stages: Outer Model Analysis and Inner Model Analysis. The research findings indicate that the key factors significantly influencing the satisfaction of non-degree program students are the expertise of the teachers and the courses offered, with the latter being the most influential factor. Conversely, for Full-Degree program students, the only factor that significantly affects their satisfaction is the variable of the learning environment. The variables of teaching expertise and courses offered in the non-degree program show a significant relationship with student satisfaction, as they have p-values 0.05 and T-statistics 1.96. The p-values for teaching expertise and courses offered are 0.032 and 0.008, respectively, and the T-statistics are 2.776 and 2.212, respectively. On the other hand, in the Full Degree program, only the variable of Learning Environment shows a significant relationship with student satisfaction, with a p-value of 0.013 and a T-statistic of 2.581. The research highlights the need to strengthen teaching quality and enhance campus facilities for both Full Degree and Non-Degree programs. It is expected that these improvements will increase the enrollment of international students in the future. 
Pengaruh Konsentrasi Awal Larutan Ion Logam Cd2+ terhadap Penyerapan Biomassa Kulit Langsat (Lansium domesticum) yang Dimodifikasi Metanol Ideal, Flami Luthfianisa; Kurniawati, Desy
MASALIQ Vol 3 No 6 (2023): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v3i6.2089

Abstract

Industrial activities have been growing rapidly lately. Increased industrial activity can improve the quality of human life, but behind it there are adverse effects on the environment and human health. There are many harmful heavy metals found in industrial waste. One of them is cadmium metal, which is one of the dangerous heavy metals that if accumulated in the body can threaten human health. Langsat fruit peel waste can be utilized as an adsorbent. Adsorbent is an absorbent substance/material to absorb heavy metal ions. Biomass was characterized using AAS instrument to determine the concentration of Cd2+ metal ion absorption in langsat peel biomass. This study was conducted to determine the effect of the initial concentration of solution on the absorption of Cd2+ metal ions in methanol-modified langsat peel biomass. The results showed that the optimal absorption of Cd2+ metal ions in methanol-modified langsat peel biomass was at a concentration of 400 mg/L with an absorption capacity of 9.387 mg/g.
Pengaruh Ukuran Partikel dan Laju Alir terhadap Penyerapan Ion Logam Pb2+ pada Kulit Langsat (Lansium Domesticum) Hamid, Syafira Putri; Kurniawati, Desy
MASALIQ Vol 4 No 1 (2024): JANUARI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v4i1.2654

Abstract

The presence of heavy metals is quite a serious problem, considering that their numbers continue to increase. Efforts to handle it have been carried out using various methods. An effective and cheap method is the biosorption method. This research to determine the absorption capacity of langsat peel (Lansium domesticum) for the absorption of Pb2+ metal ions using a column method. The parameters studied to determine optimum conditions were biosorbent particle sizes with size variations of 106, 150, 250 and 425 μm and flow rates of 1.2, 3.4 mL/minute. The results showed that the biosorption of Pb2+ metal ions was influenced by the biosorbent particle size and flow rate. The optimum particle size of the biosorbent is 106 μm and a flow rate of 1 mL/minute, with an absorption capacity of 14.615 mg/g and 14.345 mg/g, respectively.
Pengaruh Konsentrasi terhadap Penyerapan Ion Zn(II) Menggunakan Biosorben Kulit Langsat (Lansium domesticum Corr) Lestari, Kardina; Kurniawati, Desy
MASALIQ Vol 4 No 2 (2024): MARET
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v4i2.2753

Abstract

Excessive discharge of heavy metals in the environment can have negative effects on the environment and human health. environment and human health, one of which is the metal ion Zn2+. To overcome the increase in heavy metals biosorption method is used. The purpose of this study is to determine the general conditions of the initial concentration of Zn2+ that can be absorbed by langsat skin as well as the isotherm used. The results showed that optimum absorption of Zn2+ metal ions occurred at an initial concentration of 400 ppm solution and decreased with increasing concentration. The optimum absorption of Zn2+ metal ions occurs at an initial concentration of 400 ppm solution and increases with increasing concentration and decreases when it reaches the optimum state. The maximum absorption capacity obtained was 11.7168 mg/g. The capacity of biosorption of Zn2+ ions fulfills the Langmuir Isotherm equation with R2 of 0.9994.
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