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All Journal Jurnal Tadris Kimiya PAEDAGOGIA Chimica et Natura Acta Indonesian Journal of Chemistry Buletin Sumber Daya Geologi

Galuh Yuliani

Jurusan Pendidikan Kimia, Universitas Pendidikan Indonesia

Author-ID : 2680907

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Engineering Environmental Science Materials Science & Nanotechnology

Published : 6 Documents Claim Missing Document

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Articles

KARAKTERISASI ADSORPSI BATUBARA MUDA TERMODIFIKASI HIDROGEN PEROKSIDA MENGGUNAKAN METODE KONTINYU TERHADAP METILEN BIRU Galuh Yuliani; Ghea Gristannia Grandistin; Anggoro Tri Mursito
Chimica et Natura Acta Vol 3, No 1 (2015)
Publisher : Departemen Kimia

Kapasitas adsorpsi batubara muda masih lebih rendah bila dibandingkan dengan adsorben lain terutama bila dibandingkan dengan karbon aktif. Pada penelitian ini telah diupayakan peningkatan kapasitas adsorpsi pada batubara muda melalui pengayaan kadar oksigen dipermukaannya. Batubara muda yang digunakan berasal dari daerah Kalimantan, Indonesia, memiliki nilai kalori 5015,41 cal/g, 53,67 % karbon, 6,02 % hidrogen, 38,58 % oksigen, 0,69 % nitrogen, dan 0,12 % sulfur. Uji adsorpsi dilakukan menggunakan metode kontinyu dengan larutan metilen biru sebagai larutan model. Konsentrasi metilen biru ditentukan menggunakan spektrofotometri UV-Vis pada panjang gelombang 664 nm. Data hasil pengujian FTIR menunjukkan batubara muda hasil modifikasi adanya penambahan intensitas pada 1750cm-1 yang menandakan penambahan gugus C=O. Dari hasil uji adsorpsi menunjukkan adanya peningkatan kapasitas adsorpsi pada batubara muda hasil modifikasi yaitu dari 48,59 mg/g menjadi 91,11 mg/g. Dapat disimpulkan bahwa oksidasi menggunakan hidrogen peroksida telah berhasil meningkatkan kemampuan adsorpsi batubara muda.

SCIENCE, ENGINEERING, AND TECHNOLOGY OF DYE SENSITIZED SOLAR CELLS: A DIDACTICAL DESIGN BASED ON TECHNOCHEMISTRY EDUCATION Ahmad Mudzakir; Hernani Hernani; Galuh Yuliani; Dian Mustikasari
Jurnal Tadris Kimiya Vol 5, No 2 (2020)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v5i2.6741

This research was conducted to build a view of the nature of science and technology (VNoST) chemistry education students' ability through the didactical design reconstruction. The material taken is Dye-Sensitized Solar Cells (DSSCs) topic with technochemistry education model. It is a model that looked at education from the perspective of engineers and scientists who work not only on inquiry but also on a design perspective. Based on literature research, Indonesian students had low academic literacy performance as revealed in PISA (Program for International Student Assessment) study from 2000-2015. This problem can be caused by a weak teacher's abilities of the nature of science and technology (VNoST). This research's method is Research and Development (R&D) through the Model of Educational Reconstruction (MER). The instruments used were the VNoST questionnaire, interview guidelines, and content analysis guidelines. This study's subjects were 25 prospective chemistry education students in the 6th semester for pre-conception study and ten students for implementation study at one of State Universities in Indonesia. The didactical design of learning that has been developed had several advantages, including the prediction of student responses and the anticipation of educators as well as the essential material that is a barrier to student learning. Analysis of the VNoST understanding construction patterns is explored further so that the reasons that underlie students in defining science and technology and their relationship are obtained. The implementation study proved that understanding VNoST students after attending didactical design learning improved by changing students' views on science and technology to be more accurate.

TES DIAGNOSTIK MODEL MENTAL TIPE PILIHAN GANDA MULTI TINGKAT PADA MATERI KOLOID (TDM-PMTKOLOID) Wiji Wiji; Sri Mulyani; Galuh Yuliani; Rudina Okvasari
PAEDAGOGIA Vol 19, No 1 (2016): PAEDAGOGIA Jilid 19 Nomor 1 (2016)
Publisher : Universitas Sebelas Maret

Dalam penelitian ini telah dikembangkan tes diagnostik model mental dengan teknik pilihan ganda multitingkat pada materi sistem koloid (TDM-PMTKoloid) dengan menggunakan metode deskriptif. TDM-PMT-Koloid terdiri dari 9 butir pertanyaan (5 subkonsep) yang meliputi empat pilihan jawaban dan empat pilihan alasan. Pilihan jawaban merupakan representasi makroskopik dan simbolik yang dikembangkan melalui data primer percobaan dan pengamatan dalam kehidupan sehari-hari. Pilihan alasan merupakan representasi model submikroskopis yang dikembangkan berdasarkan kajian beberapa buku teks General Chemistry. TDMPMT-Koloid telah dinyatakan valid dengan beberapa catatan perbaikan oleh lima orang panelis yang terdiri dari seorang profesor bidang Pendidikan Kimia, seorang doktor bidang Pendidikan Kimia, dan tiga orang doktor bidang Kimia Fisika. Uji reliabilitas menggunakan metoda Cronbach didapatkan koefisien reliabilitas Cronbach Alpha sebesar 0,782 untuk total soal dan antara 0,607-0,797 untuk setiap subkonsep. Hasil ujicoba TDM-PMT-Koloid terhadap 46 siswa ditemukan sebanyak 21% memiliki model mental utuh (memahami konsep koloid dalam tiga level representasi); sebanyak 33% memiliki model mental parsial (memahami konsep koloid dalam salah satu level representasi); dan 46% memiliki model mental hampa (tidak memahami konsep koloid dalam semua level representasi).

Microscopic Observation of Solid-Liquid Reaction: A Novel Laboratory Approach to Teaching Rate of Reaction Agus Setiabudi; Asep Wahyudin; Galuh Yuliani; Mauro Mocerino
Indonesian Journal of Chemistry Vol 17, No 1 (2017)
Publisher : Universitas Gadjah Mada

The importance of observation in science and science education has triggered this laboratory development study that investigated the value of an observation kit as a new approach to teaching rate of reaction in general chemistry class. The kit consists of a digital microscope, a “chemical reactor”, and a tailor-made computer application and was used to video-record a solid-liquid reaction and to produce a series of two dimensional solid images that indicate the extent of reaction. The two dimensional image areas were calculated by the computer application and using the assumption that the image area was directly proportional to the mass of the solid, a plot of solid mass versus time could be obtained. These steps have been tested in several solid-liquid reaction systems, with the reaction of solid magnesium oxide with nitric acid solution resulting in the best images which were transferable to rate of reaction data, i.e. a plot of solid MgO mass as a function of time. The plot can be used to explain rate of reaction concepts including average, instantaneous, and initial rate. Furthermore, the effect of concentration on reaction rate could also be explained. This study showed that the observation kit and the generated data set have the advantage of allowing students to clearly and repeatedly visualise a solid-liquid reaction and relate this with the concept of rates of reactions. The observation kit also allows teachers and students to extend its application into inquiry based experiments.

A Green Synthesis of a Novel Calix[4]Resorcinarene from 7-Hydroxycitronellal Using Microwave Irradiation Ratnaningsih Eko Sardjono; Iqbal Musthapa; Iis Rosliana; Fitri Khoerunnisa; Galuh Yuliani
Indonesian Journal of Chemistry Vol 18, No 1 (2018)
Publisher : Universitas Gadjah Mada

A new versatile macromolecule cyclic C-3,7-dimethyl-7-hydroxycalix[4]resorcinarene (CDHHK4R) has been synthesized from a fragrance agent, 7-hydroxycitronellal, via microwave irradiation. The reaction utilized a domestic microwave oven at various irradiation time and power to yield an optimum condition. As a comparison, the conventional heating method was also employed for the synthesis of the same calix[4]resorcinarene. Compared to the conventional method, microwave-assisted reaction effectively reduced the reaction time, the amount of energy consumption and the waste production. It is found that the synthesis of CDHHK4R by microwave irradiation yielded 77.55% of product, higher than by conventional heating which was only 62.17%.

POTENTIAL APPLICATION OF LIGNITE AS ADSORBENTS IN INDUSTRIAL WASTEWATER TREATMENT: A MINI REVIEW Galuh Yuliani
Buletin Sumber Daya Geologi Vol. 10 No. 2 (2015): Buletin Sumber Daya Geologi
Publisher : Pusat Sumber Daya Mineral Batubara dan Panas Bumi

Low rank coal (or lignite) is a low grade, wet, low cost and highly abundant coal. The high moisture content of lignite limits its application as high-heating value fuel and also creates barrier for its export as fuel. However, this property should not necessarily hinder its use in the water industry. Similar to activated carbons, lignite has the theoretical ability to treat the wastewater by adsorbing contaminants from aqueous solution. This review paper highlights the potential use of lignite in wastewater treatment industry.

Co-Authors Agus Setiabudi Ahmad Mudzakir Anggoro Tri Mursito Dian Mustikasari Fitri Khoerunnisa Ghea Gristannia Grandistin HERNANI - Iis Rosliana Iqbal Musthapa Mauro Mocerino mulyani, Sri Ratnaningsih Eko S. Rudina Okvasari Wahyudin, Asep Wiji Wiji

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