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Synthesis and Characterization of TiO2-CaO and TiO2-CaO-Fe2O3 Photocatalyst for Removal of Catechol Tahya, Candra Yulius; Irawati, Wahyu; Karnelasatri, Karnelasatri; Purba, Friska Juliana
Molekul Vol 14, No 2 (2019)
Publisher : Universitas Jenderal Soedirman

TiO2-CaO and TiO2-CaO-Fe2O3 photocatalysts have been synthesized through the surfactant-assisted sol-gel method. The catalysts were characterized using XRD, FTIR, SEM-ED Sand BET surface area. XRD pattern showed the formation of anatase TiO2 crystal phase both in TiO2-CaO and TiO2-CaO-Fe2O3. The TiO2-CaO has higher crystallinity than TiO2-CaO-Fe2O3. Based on the peak refinement using Rietveld, there are two peaks identified as Fe2O3 hematite in the sample TiO2-CaO-Fe2O3. BET surface area analysis showed that the average pore size of TiO2-CaO and TiO2-CaO-Fe2O3 catalysts are 8.04 and 8.41 nm respectively, indicating both catalysts are mesoporous.FTIR spectra show that the vibration of Ti-O, Ca-O, and Ca-TiO2 were observed in both catalysts. SEM images confirm that both catalysts are porous material. The catechol removal using TiO2-CaO and TiO2-CaO-Fe2O3 improved with the increase of catalyst concentration. After 360 minutes of UV radiation, the removal of catechol using TiO2-CaO-Fe2O3 reached 46.0%, 48.3%, and 69.2%, while when using TiO2-CaO, it reached 22.1%, 36.8%, and 57.0% for 0.1 g, 0.15 g, and 0.2 g of catalysts, respectively. The photocatalytic activity of TiO2-CaO-Fe2O3 is not so strong compared to TiO2-CaO catalyst but the catechol adsorption property of TiO2-CaO-Fe2O3 is higher than that of TiO2-CaO catalyst.

PERAN TUTOR DALAM PROSES PEMBELAJARAN DENGAN METODE BERORIENTASI PADA TUTEE (BERMAIN, DISKUSI, CERAMAH) Purba, Friska Juliana; Sinaga, Kelly; Sitinjak, Debora S; Tahya, Candra Y; Karnelasatri, Karnelasatri
JEC: Journal of Educational Chemistry Vol 2, No 1 (2020)
Publisher : Chemistry Education Department

Melihat kondisi anak-anak di wilayah Pos Dumpit ditemukan kondisi anak-anak yang seharusnya sudah berada di level yang tinggi akan tetapi secara kemampuan masih berada di level yang rendah. Hal ini disebabkan karena keterbatasan perekonomian keluarga dimana mata pencaharian keluarga itu sebagian besar buruh serabutan, kuli cuci piring, dan pemulung. Untuk itu bimbingan belajar Pos Dumpit dengan menghadirkan tutor yang sudah diperlengkapi secara pedagogis dan ilmu pengetahuan didirikan dan bertujuan untuk: Meningkatkan kemampuan membaca, menulis, dan menghitung pada anak-anak dengan cara memberikan pembelajaran yang menarik dan menyenangkan pada anak TK dan SD; Membantu anak-anak dalam memahami pelajaran yang sulit di sekolah; Membantu anak-anak dalam menanamkan sikap berjuang melalui belajar yang giat; Membantu anak-anak dalam meningkatkan kemampuan berpikir dan perubahan tingkah laku ke arah yang lebih baik. Metode yang digunakan yaitu bermain, diskusi, dan ceramah, akan tetapi disesuaikan dengan kebutuhan dari tutee dan tingkatan. Dengan metode tersebut, tutee semakin termotivasi dan keinginan belajar mereka semakin meningkat dilihat dari antusiasme dalam belajar maupun jumlah kehadiran semakin bertambah.

Alkitab Sebagai Sumber Pengetahuan Sejati Dalam Pendidikan Kristen Di Sekolah Kristen: Sebuah Kajian Epistemologi Evasari Kristiani Lase; Friska Juliana Purba
Jurnal Abdiel: Khazanah Pemikiran Teologi, Pendidikan Agama Kristen dan Musik Gereja Vol 4 No 2 (2020): Oktober 2020
Publisher : Sekolah Tinggi Theologia Abdiel

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37368/ja.v4i2.145

Sekolah Kristen tergeser oleh filsafat humanistik dan terjebak pada hal-hal sempit yang hanya menekankan pengetahuan akademik sebagai hal utama. Sebaliknya, sekolah pendidikan Kristen seharusnya mengajarkan pengetahuan sejati yang mengenalkan Kristus sebagai sumber segala pengetahuan. Pengetahuan sejati ini hanya didapatkan dari Allah yang telah menyatakan diri-Nya di dalam Alkitab. Tujuan penulisan ini adalah memaparkan pentingnya Alkitab sebagai sumber pengetahuan sejati dalam pendidikan Kristen. Pembahasan bahwa Allah adalah Kebenaran itu sendiri, maka Alkitab juga mengandung kebenaran karena diinspirasikan oleh pribadi Allah yang benar. Alkitab memiliki signifikansi di dalam sekolah pendidikan Kristen karena sekolah adalah sarana dalam mengenalkan Allah kepada siswa sehingga mereka mengalami pembaruan identitas diri di dalam Kristus dan memiliki karakter Kristen dewasa yang dapat bertanggung jawab kepada Allah, Gereja, negara, dan masyarakat. Oleh sebab itu, Alkitab menjadi sumber pengetahuan sejati dalam pendidikan Kristen karena fondasi pendidikannya berlandaskan Allah Tritunggal sebagai realitas tertinggi pengetahuan dan kebenaran yang ada, sebab di dalam Dialah segala yang kelihatan dan yang tidak kelihatan diciptakan (Kolose 1:16). Saran yang dapat diberikan terkait tulisan ini adalah pembahasan mengenai kurikulum sekolah Kristen yang telah ditebus melalui Tema-Tema Kontekstual Wawasan Kristen Alkitabiah (TKWKA).

Pengenalan Pupuk Organik Cair dan Sistem Biopori di Kampung Babakan, Tangerang Karnelasatri; Kelly Sinaga; Candra Yulius Tahya; Debora Sitinjak; Friska Juliana Purba
Agrokreatif: Jurnal Ilmiah Pengabdian kepada Masyarakat Vol. 7 No. 3 (2021): Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agrokreatif.7.3.229-236

Every year waste production has increased because of human population growth in Indonesia. The most waste component is organic waste, which contributes a negative impact on the environment and human health. This situation is also discovered in the Babakan Sub-village, Binong, Tangerang District. The awareness of the society related to waste management is needed to improve due to the garbage in this village is not managed properly. Moreover, a high frequency of flooding has happened in this area during the rainy season. To deal with this problem, the community service team of Pelita Harapan University introduced a biopori system and organized a workshop to produce liquid organic fertilizer. The purpose of this activity was to raise awareness of waste management in the society of Babakan related to waste management and environmental health. The method used was the field observation and community education that was counseling and workshop. The service had been going great and the society of Babakan village, Tangerang, gave a positive and active response. These community services caused the society of Babakan, Binong, Tangerang to get new options to manage their waste more properly.

Peran Tutor dalam Proses Pembelajaran dengan Metode Berorientasi pada Tutee (Bermain, Diskusi, Ceramah) Friska Juliana Purba; Kelly Sinaga; Debora S Sitinjak; Candra Y Tahya; Karnelasatri Karnelasatri
Journal of Educational Chemistry (JEC) Vol 2, No 1 (2020)
Publisher : Chemistry Education Department

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21580/jec.2020.2.1.5728

Melihat kondisi anak-anak di wilayah Pos Dumpit ditemukan kondisi anak-anak yang seharusnya sudah berada di level yang tinggi akan tetapi secara kemampuan masih berada di level yang rendah. Hal ini disebabkan karena keterbatasan perekonomian keluarga dimana mata pencaharian keluarga itu sebagian besar buruh serabutan, kuli cuci piring, dan pemulung. Untuk itu bimbingan belajar Pos Dumpit dengan menghadirkan tutor yang sudah diperlengkapi secara pedagogis dan ilmu pengetahuan didirikan dan bertujuan untuk: Meningkatkan kemampuan membaca, menulis, dan menghitung pada anak-anak dengan cara memberikan pembelajaran yang menarik dan menyenangkan pada anak TK dan SD; Membantu anak-anak dalam memahami pelajaran yang sulit di sekolah; Membantu anak-anak dalam menanamkan sikap berjuang melalui belajar yang giat; Membantu anak-anak dalam meningkatkan kemampuan berpikir dan perubahan tingkah laku ke arah yang lebih baik. Metode yang digunakan yaitu bermain, diskusi, dan ceramah, akan tetapi disesuaikan dengan kebutuhan dari tutee dan tingkatan. Dengan metode tersebut, tutee semakin termotivasi dan keinginan belajar mereka semakin meningkat dilihat dari antusiasme dalam belajar maupun jumlah kehadiran semakin bertambah.

Upaya Meningkatkan Hasil Belajar Kognitif Kimia Siswa dengan Menggunakan Metode Latihan (Drill) Evasari Kristiani Lase; Friska Juliana Purba
SAP (Susunan Artikel Pendidikan) Vol 5, No 1 (2020)
Publisher : Universitas Indraprasta PGRI Jakarta

Results of cognitive learning of students in one of the schools in Lampung towards the chemistry lesson for the 2019/2020 school year showed less satisfactory. Out of a total of 9 grade XI IPA students, 5 students have not been able to reach the KKM because of the lack of students’ learning experience that has an impact on the low cognitive outcomes. Teachers overcome this problem by implementing the drill method. Chemical variation work requires a lot of practice. This article aims to expose the exercise methods to the implementation of students learning experiences and to improve student's cognitive learning outcomes. The methodology used was a literature study by collecting all references to issues that had been analyzed through mentor feedbacks and teacher teaching reflections. Literature studies showed that exercise method could help improve student's cognitive learning outcomes by following the implementation procedures of existing method. The exercise method looked at the students having each potential that needed to be trained and developed with the following implementation steps: 1). Teachers conveyed the purpose of learning. 2). Teachers provided motivation for learning. 3). Teacher provided material explanations with examples of questions. 4). The teacher checked the students ' understanding and gave the opportunity to ask. 5). The student did the exercise questions given by the teacher. 6). The exercise questions were discussed together by the teacher and the students as well as emphasized the concept of material that had not been masteredby students.

Phenol Biodegradation and Catechol 2,3-Dioxygenase Gene Sequencing of Bacillus cereus IrC2 isolated from Rungkut Indonesia Candra Yulius Tahya; Wahyu Irawati; Friska Juliana Purba
Jurnal Kimia Terapan Indonesia Vol 21, No 1 (2019)
Publisher : Research Center for Chemistry - LIPI

Phenol is toxic organic compounds that harmful to humans, mammals, and disrupt the aquatic environment, especially higher-organisms in fresh-water environment. The biodegradation method using bacteria to degrade hazardous chemical and detoxify wastewater is an effective and efficient method. Bacillus cereus IrC2 isolated from sludge in an industrial wastewater treatment plant in Rungkut â€“ East Java, Indonesia has been examined for the ability to degrade phenols in minimal salt medium. Bacillus cereus IrC2 is Gram-positive bacterium. This bacterium is motile, rod-shaped and its nucleotides sequence of 16S rRNA gene has been sequenced and can be accessed in GenBank with accession number MK511840. Bacillus cereus IrC2 is capable to use phenol up to 400 ppm as the sole carbon source to grow for 48 hours incubation. Phenol degrades 96% from initial concentration. Degradation of phenol was calculated by colorimetric method using 4-aminoantipyrine reagent and confirmed by GC MS analysis. The aerobic degradation of phenol pathways consists of three steps; in the first step, two hydroxyl groups are inserted into aromatic ring and catalyzed by mono or dioxygenase to produce dihydroxy aromatic compounds which are mostly catechols. Catechol enters the next step of aromatic ring cleavage catalyzed by catechol 1,2-dioxygenase and/or catechol 2,3- dioxygenase. The catechol 2,3-dioxygenase gene of Bacillus cereus IrC2 has been amplified by PCR and cloned into pTA2 vector. The cloned plasmid (pTA2-catE) was transformed into E. coli DH5Î± and selected blue-white colonies. The insert sequence was determined by Sanger deoxy sequencing method. The catechol 2,3-dioxygenase gene nucleotides sequence of Bacillus cereus IrC2 was submitted nto GenBank with accession number MK561609.

Discovery learning model to optimize students’ critical thinking skills on hydrocarbon material Tesa Lonika Yuniawati; Friska Juliana Purba
Jurnal Pendidikan Kimia (JPKim) Vol 13, No 3 (2021): December
Publisher : Pascasarjana Universitas Negeri Medan

Learning in 21st century requires an advance human mindset, especially critical thinking skills. Critical thinking skills improve the learning process to be more optimal in taking the core of the learning. However, data shows that the critical thinking skills of class XI IPA 2 students are still lacking because they have not been able to answer the analytical questions which is this is the important skills for the students. This paper aims to describe the use of discovery learning models to optimize students' critical thinking skills. The research method used is descriptive qualitative. The research subjects were 28 students of class XI IPA 2 in one of the senior high schools in Jakarta in the academic year 2021/2022 odd semester. Based on the study and data on each indicator, it was found that the use of discovery learning models was able to optimize students' critical thinking skills. Each step in the discovery learning model facilitates the achievement of indicators of critical thinking skills. Keywords: Critical thinking, discovery learning, learning in 21st century

Upaya Meningkatkan Hasil Belajar Kognitif Siswa Pada Pelajaran Termokimia Menggunakan Student Team Achievement Division (STAD) [An Attempt to Improve the Students' Cognitive Learning Result in Thermochemistry by Using the Student Team Achievement Division (STAD)] Nesa Fiona; Friska Juliana Purba
Diligentia: Journal of Theology and Christian Education Vol 2, No 3 (2020): September
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/dil.v2i3.2325

The Triune God is a God related in love so that students as an image of God are also enabled to relate in class communities. The class as a learning community uses every potential to achieve shared cognitive learning goals. In fact, when studying thermochemical class XI at XYZ Jakarta High School, it was found that students had not used their academic abilities to achieve shared learning goals. Based on their academic abilities students provide different cognitive responses and learning outcomes. Students with high academic ability do not do the practice questions because they feel they understand, and the learning outcomes are good. Low academic ability students give up learning thermochemistry because they find it difficult and their learning outcomes are low. Based on that, this paper will examine efforts to improve student cognitive learning outcomes in thermochemical lessons using the STAD cooperative learning model. Papers are written using literature study data collection techniques. The results showed that STAD can be used to improve student cognitive learning outcomes on thermochemical topics. STAD cooperative learning provides group learning that encourages students to check understanding and exchange information about thermochemistry.

PENGEMBANGAN PENUNTUN PRAKTIKUM KIMIA SESUAI MODEL PEMBELAJARAN PENEMUAN DAN BERBASIS PROYEK Friska Juliana Purba; Zainuddin Muchtar; Ramlan Silaban
JURNAL PENELITIAN BIDANG PENDIDIKAN Vol 21, No 1 (2015)
Publisher : LPPM Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpbp.v21i1.2987

Abstract This research aims to develop practical guidance reaction rates accordingto the model of project-based learning and discovery. To know the differencesignificantly increase learning outcomes that learned by using practical guidancemodel of project-based learning and discovery. Determine the effectiveness of thatlearned how to use the guide practical model of project-based learning anddiscovery. Samples were taken by two classes of experimental class I taught usingpractical guide appropriate experimental models of discovery and class II are taughtusing practical guide appropriate project-based learning model. Before do thisresearch practical guidance has been developed, validated by lecturers and teacherswho are experts in their field and tested to school. Based on the results of thequestionnaire tabulation showed that the average value of project-based learningmodel is higher than the average value of the discovery learning model. Thusobtained that correspond practical guidance based model projects more effectivelyapplied in learning compared with corresponding practical guidance discoverylearning model. Meanwhile, after learning outcomes tested that correspond practicalguide more effective discovery learning model applied in learning compared withcorresponding practical guide project-based learning model. This is evident becausethe students in the experimental class I, which uses practical guide with models ofdiscovery in doing practical implementation to fully follow lab procedures with toolsand materials have also been provided to make the students evenly understand thelab work while in the second experiment class requires students to design ownpractice, as well as determine the tools and materials to find yourself in a group. Theapplication of such a practice models still can not fully be done in schools, becausethe ability of the students have not been evenly distributed so that in practice thereis a group of students who dominate the lab work and the other as observers only. Kata kunci:Development Guidance Practical, DiscoveryModel, Project Based Learning.

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