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Kemudahan Biodegradasi Selulosa Bakteri dari Limbah Cucian Beras dengan Penambahan Gliserol, Kitosan, dan Nanopartikel Perak Agung Nugaraha Catur Saputro; Baki Mulyani; Nanik Dwi Nurhayati; Yunita Kurniawan
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 2, No. 1, Mei 2016
Publisher : Syarif Hidayatullah State Islamic University

The objectives of this research were to study the effect of glycerol and chitosan addition toward biodegradability of cellulose based rice waste water, the effect of biodegradation time toward mass lost and biodegradability, and determine functional group and crystalinity of the highest biodegradability composite. Bacterial celluloses were prepared from 100 mL rice waste water that fermented by Acetobacter xylinum for 7 days with addition of glycerol (for Cellulose-Glycerol and Cellulose-Glycerol-Chitosan). Then, bacterial celluloses were immersed in chitosan solution (for Cellulose-Chitosan and Cellulose-Glycerol-Chitosan). The water in bacterial cellulose and its composites was removed by heating, then deposited silver nanoparticle on the bacterial cellulose and its composite. The silver nanoparticles were prepared by chemical reduction with using AgNO3 solution, trisodium citric as reducing agent, and gelatin as stabilizer. The silver nanoparticle was deposited into bacterial cellulose and its composites film by immersing method. After that, the bacterial cellulose and its composites were biodegradated by soil burrial test method for 14 days. Then, cellulose with the highest biodegradability was characterized by ATR-FTIR and XRD. The silver nanoparticle formation was showed by UV-Vis spectrum with peak in the 418.8 nm area. The glycerol addition can increase biodegradability, whereas the chitosan addition can decrease biodegradability. The increasing of biodegradation time, mass lost increased but the biodegradability decreased. After biodegradation, intensity of pyran cyclic in cellulose-glycerol which is deposited Ag (SG + Ag) decreased, but crystallinity of it increased. Keywords : Biodegradation, glycerol, chitosan, silver nanoparticle, bacterial cellulose. DOI: http://dx.doi.org/10.15408/jkv.v2i1.3111

PENGEMBANGAN KOMPETENSI KEPROFESIAN BERKELANJUTAN PENDIDIK ANAK USIA DINI DI KECAMATAN JATEN KABUPATEN KARANGANYAR Nanik Dwi Nurhayati; Budi Hastuti
AWLADY : Jurnal Pendidikan Anak Vol 3, No 1 (2017)
Publisher : Jurusan PIAUD IAIN Syekh Nurjati Cirebon

The aim research to determine the level of professions competence and efforts development professions competence to early childhood theacher in Jaten Karanganyar. The Research is descriptive quantitative research with competence theacher variable. Respondents are early childhood theacher who are in group Himpaudi Jaten. The technique of collecting data through interviews, observations, questionnaires closed and open. The validity of the data using content validity. Data were analyzed using a formula to determine the percentage of achievement of each component. The results showed competence level of profession of early childhood theacher in Jaten aspects of profession competency subject matter and methods of 84,6% category very well, the aspect of profession competency curriculum and syllabus of 88,3% category very well, the aspect competence development profession ethics of 74,7% category excellent and efforts most effectively professional competence development through the training. The theacher have conducted of subject matter and methods appropriate 13th curriculum and syllabus, develop ethical scientific excellent professionalism. Nevertheles need to improve of the classroom action research and making scientific that do rarely to theacher to improve professionalism competence.

SINTESIS DAN KARAKTERISASI MEMBRAN KITOSAN UNTUK APLIKASI SENSOR DETEKSI LOGAM BERAT Agung Nugroho CS; Nanik Dwi Nurhayati; Budi Utami
Molekul Vol 6, No 2 (2011)
Publisher : Universitas Jenderal Soedirman

Penelitian tentang pemanfaatan membran kitosan sebagai sensor deteksi logam berat berdasarkan sifat optic belum pernah dilaporkan. Penelitian ini melaporkan kajian tentang sintesis membrane kitosan untuk diaplikasikan sebagai sensor deteksi logam berat berdasarkan sifat optic. Sebagai laporan awal, pada artikel ini baru akan dilaporkan kajian sintesis membrane kitosan dari serbuk kitosan hasil preparasi dari cangkang kepiting dan karakterisasinya. Penelitian awal ini bertujuan untuk mensintesis membrane kitosan dari serbuk kitosan dan karakterisasinya. Serbuk kitosan dipreparasi dari cangkang kepiting melalui proses deproteinasi, demineralisasi dan deasetilasi. Membran kitosan dibuat dari kitosan dengan penambahan agen crosslingking berupa glutaraldehida. Kitosan dikarakterisasi meliputi uji kadar air, kadar abu, kadar nitrogen, viskositas, derajat deasetilasi, analisis gugus fungsi dengan spektroskopi IR dan kristalinitas dengan difraksi sinar X. Membran kitosan dilakukan karakterisasi penampilan fisik, analisis gugus fungsi dan kristalinitas. Kesimpulan penelitian adalah 1) kitosan dapat dipreparasi dari limbah cangkang kepiting melalui proses deproteinasi, demineralisasi, dan deasetilasi, 2) membran kitosan dapat disintesis dari serbuk kitosan dengan menggunakan agen crosslinking glurataldehida, 3) semakin tinggi konsentrasi kitosan yang digunakan untuk membuat membran, maka membran yang dihasilkan akan menunjukkan warna yang pekat dan kurang transparan, 4) struktur kimia kitosan dalam bentuk membran kitosan tidak mengalami perubahan tetapi kristalinitasnya berubah.

Synthesis and Thermal-Stability Study of Polybutylene Itaconate Modified with Divinyl Benzene and Glycerol Atmanto Heru Wibowo; Ninis Makhnunah; Deny Irawati; Candra Purnawan; Nanik Dwi Nurhayati; Henning Storz
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Polybutylene itaconate (PBI) for modification with divinyl benzene (DVB) and glycerol has been synthesized at 180 °C for 3 h via polycondensation of itaconic acid (IA) and butanediols using catalyst of Ti(OBu)4. Modification on PBI was done with addition of 15%, 20% and 25% DVB (w/w) using benzoyl peroxide. With glycerol, weight variations of glycerol:1,4-butanediol (BDO) in the synthesis were 10%, 30%, and 50% (mole/mole). PBI and PBI modified with DVB and glycerol were characterized with FTIR and TG-DTA. PBI showed a wavenumber shift from 1703 cm-1 to 1728 cm-1 of the C=O functional group from acid to esther. The DVB modification on PBI also showed that the intensity decrease of C=C stretching was due to the formation of crosslinking on the double bond. In the modification with glycerol, three dimensional networking on the polyester occurred through bonding between hydroxyl of glycerol and acid group of IA. Constant intensity of C=C stretching on polyester was seen. The thermal stability of PBI modified with DVB increased, accompanied by rigidity change of the structure. The thermal stability of PBI modified with glycerol decreased, caused by the decrease of regularity degree and the elasticity increase of the three dimensional structure of polyester.

Content Validity in Android-Based Augmented Reality Media for High School Science Students on Covalent Bonds Topic: Rasch Model Analysis Sri Yamtinah*; Mega Candra Dewi; Nanik Dwi Nurhayati; Endang Susilowati; Isma Aziz Fakhrudin; Dimas Gilang Ramadhani; Ari Syahidul Shidiq; Sulistyo Saputro
Jurnal Pendidikan Sains Indonesia Vol 10, No 2 (2022): APRIL 2022
Publisher : Universitas Syiah Kuala

The 21st-century chemistry learning that teaches abstract and complex concepts needs to develop learning media that can increase students' learning motivation and visualize abstract concepts in chemistry. One of the media in the 21st century developed in this study is Android-based augmented reality media. The purpose of this study was to test the validity of the Android-based Augmented Reality media and see the differences in perceptions between teachers and students in assessing media. The validation of android-based Augmented Reality learning media uses a questionnaire and is quantitative. The Rater for assessing the product consisted of 6 senior chemistry teachers at 5 different schools in Surakarta and 20 students who had obtained the material for covalent bonding at SMA N 1 Ngemplak Boyolali. The data obtained were analyzed by Rasch Model using Facets software. The results of the analysis show that exact agreements are 35.1% and exacted agreements are 35.2%. This happens because the aspects are considered easy by the teacher, but the students consider these aspects difficult. The aspect or item that is considered the most difficult to achieve is the suitability of the example with the material and improving understanding of the material. Based on this research, in developing media, it must be packaged properly so that it is easily understood and understood by students

Tapping into collaborative skills and learning achievement: The effect of implementing the common knowledge construction model equipped with podcasts on chemical bonds topic Fa'ari Salsabila; Sri Yamtinah; Nanik Dwi Nurhayati; Antuni Wiyarsi; Hayuni Retno Widarti; Ari Syahidul Shidiq
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.54132

The impact of integrating the Common Knowledge Construction Model (CKCM) with Chemical Bonds-focused Podcasts on students' collaboration skills and cognitive learning achievements is investigated in this study. A quasi-experimental design was employed, with cluster random sampling to select the experimental (N=23) and control (N=30) classes from a private high school in Solo City. Descriptive and inferential analyses were conducted, employing the Mann-Whitney test for hypothesis testing. Results showed that the CKCM approach significantly enhanced collaboration skills (p < 0.001) and learning achievements (p = 0.014), indicating substantial educational benefits. In conclusion, integrating the CKCM with Chemical Bonds podcasts positively influenced students' collaboration skills and cognitive learning achievements. Moreover, this comprehensive model addressed conventional learning objectives and integrated elements of ethnoscience, providing students with a broader and more culturally contextualized understanding. The CKCM model, supplemented by podcasts, facilitated a dynamic learning environment that actively engaged students in knowledge construction. These findings advocate for integrating CKCM and podcasts into educational curricula, offering a scalable model for enhancing 21st-century skills.

Boosting Critical Thinking Skills: Applying the Dilemma Stories Approach with the 5E Learning Cycle in Buffer Subject Education Anisa Ayu Solikah; Sulistyo Saputro; Sri Mulyani; Lina Mahardiani; Endang Susilowati; Nanik Dwi Nurhayati; Budi Hastuti; Wirawan Ciptonugroho
AL-ISHLAH: Jurnal Pendidikan Vol 16, No 2 (2024): AL-ISHLAH: JURNAL PENDIDIKAN
Publisher : STAI Hubbulwathan Duri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35445/alishlah.v16i2.4556

This study explores the impact of the Dilemmas approach, rooted in transformative learning, on enhancing critical thinking skills in buffer chemistry subjects among high school students. Employing a mixed-methods design and purposive sampling, the research involved 34 eleventh-grade students from SMAN 1 Surakarta. The implementation of dilemma stories integrated with a 5E learning cycle was scrutinized using various data collection methods, including observations, student reflective journals, pretest-posttest assessments, the Constructivist Chemistry Values Learning Environment Survey (CCVLES), and interviews. Observations assessed the application of the dilemma stories and the 5E learning cycle. Pretest-posttest evaluations measured changes in students' critical thinking abilities, while reflective journals and CCVLES questionnaires captured students' perceptions of their critical thinking skills and their learning experiences. Interviews were conducted to validate the findings from the tests, journals, and questionnaires. Data analysis involved reduction, display, and conclusion-drawing techniques. The findings suggest that the Dilemmas approach significantly fosters students' ability to think critically and apply chemical concepts practically. This was evidenced by students' analyses of dilemma stories and responses in interviews, CCVLES questionnaires, and reflective journals, indicating a deeper engagement with and understanding of the subject matter through this innovative learning strategy.

Modification of Coal Fly Ash Waste into Manganese-Oxide-Coated-Zeolite (MOCZ) to Adsorb Heavy Metal Ions Ni2+ Saputro, Sulistyo; Mahardiani, Lina; Susilowati, Endang; Nurhayati, Nanik Dwi; Ciptonugroho, Wirawan; Windiasty, Ananda Dea; Prihantoro, Alita Selvi
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 1, May 2024
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i1.35794

High consumption of coal as a source of electrical energy in Indonesia has resulted in piles of waste from coal burning, namely fly ash, which can damage the environment and harm health. Fly ash contains main oxides, namely silica (SiO2) and alumina (Al2O3), whose components are similar to zeolite, so they can be synthesized into zeolite-like material (ZLM) which can be used as an adsorbent for heavy metal Ni2+. Therefore, this research discussed the characterization of manganese-oxide-coated-zeolite (MOCZ) from fly ash waste as a heavy metal adsorbent. The research procedure consisted of preparation, purification, and activation stage of fly ash to obtain fly ash that is free from impurities, the stage of making sodium silicate and sodium aluminate, and zeolite synthesis. The resulting zeolite was then coated with manganese oxide to expand the surface area of the zeolite and increase the ability of zeolite to adsorb heavy metal Ni2+. The research results showed that fly ash waste that was coated with manganese oxide can adsorb heavy metal Ni2+. The adsorption of the Ni2+ metal ion solution by zeolite with MOCZ modification is in line with the pseudo-second-order kinetic and Langmuir isotherm.

Tapping into collaborative skills and learning achievement: The effect of implementing the common knowledge construction model equipped with podcasts on chemical bonds topic Salsabila, Fa'ari; Yamtinah, Sri; Nurhayati, Nanik Dwi; Wiyarsi, Antuni; Widarti, Hayuni Retno; Shidiq, Ari Syahidul
Jurnal Pendidikan Kimia Vol. 16 No. 1 (2024): April
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i1.54132

The impact of integrating the Common Knowledge Construction Model (CKCM) with Chemical Bonds-focused Podcasts on students' collaboration skills and cognitive learning achievements is investigated in this study. A quasi-experimental design was employed, with cluster random sampling to select the experimental (N=23) and control (N=30) classes from a private high school in Solo City. Descriptive and inferential analyses were conducted, employing the Mann-Whitney test for hypothesis testing. Results showed that the CKCM approach significantly enhanced collaboration skills (p < 0.001) and learning achievements (p = 0.014), indicating substantial educational benefits. In conclusion, integrating the CKCM with Chemical Bonds podcasts positively influenced students' collaboration skills and cognitive learning achievements. Moreover, this comprehensive model addressed conventional learning objectives and integrated elements of ethnoscience, providing students with a broader and more culturally contextualized understanding. The CKCM model, supplemented by podcasts, facilitated a dynamic learning environment that actively engaged students in knowledge construction. These findings advocate for integrating CKCM and podcasts into educational curricula, offering a scalable model for enhancing 21st-century skills.

Modification of Coal Fly Ash Waste into Manganese-Oxide-Coated-Zeolite (MOCZ) to Adsorb Heavy Metal Ions Ni2+ Saputro, Sulistyo; Mahardiani, Lina; Susilowati, Endang; Nurhayati, Nanik Dwi; Ciptonugroho, Wirawan; Windiasty, Ananda Dea; Prihantoro, Alita Selvi
Jurnal Kimia Valensi Jurnal Kimia VALENSI, Volume 10, No. 1, May 2024
Publisher : Department of Chemistry, Faculty of Science and Technology Syarif Hidayatullah Jakarta State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v10i1.35794

High consumption of coal as a source of electrical energy in Indonesia has resulted in piles of waste from coal burning, namely fly ash, which can damage the environment and harm health. Fly ash contains main oxides, namely silica (SiO2) and alumina (Al2O3), whose components are similar to zeolite, so they can be synthesized into zeolite-like material (ZLM) which can be used as an adsorbent for heavy metal Ni2+. Therefore, this research discussed the characterization of manganese-oxide-coated-zeolite (MOCZ) from fly ash waste as a heavy metal adsorbent. The research procedure consisted of preparation, purification, and activation stage of fly ash to obtain fly ash that is free from impurities, the stage of making sodium silicate and sodium aluminate, and zeolite synthesis. The resulting zeolite was then coated with manganese oxide to expand the surface area of the zeolite and increase the ability of zeolite to adsorb heavy metal Ni2+. The research results showed that fly ash waste that was coated with manganese oxide can adsorb heavy metal Ni2+. The adsorption of the Ni2+ metal ion solution by zeolite with MOCZ modification is in line with the pseudo-second-order kinetic and Langmuir isotherm.

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