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All Journal KOVALEN: Jurnal Riset Kimia Pendas : Jurnah Ilmiah Pendidikan Dasar Jurnal Penelitian Pembelajaran Matematika Sekolah
Nurhalisa, Sitti
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Chemical Engineering, Chemistry & Bioengineering Chemistry Mathematics Other

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Sintesis dan Karakterisasi Komposit Mn-N-TiO2/Bentonit untuk Degradasi Polutan Organik: Synthesis and Characterization of Mn-N-TiO2/Bentonite Composite for Organic Pollutants Degradation Ruslan; Prismawiryanti; Sumarni, Ni Ketut; Ridhay, Ahmad; Riski, Mutiara Zalfa; Nurhalisa, Sitti; Marsela, Anggi
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 3 (2024): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i3.17502

Abstract

Research has been conducted on the synthesis and characterization of Mn-N-TiO2/Bentonite composites for the degradation of organic pollutants. This study aims to synthesize the Mn-N-TiO2/Bentonite composite as a catalyst in degrading congo red in visible light and to determine the effect of irradiation time on the effectiveness of photodegradation of congo red catalyzed Mn-N-TiO2/Bentonite. The synthesis of the Mn-N-TiO2/Bentonite composite was carried out using the sol-gel method. Characterization was carried out with UV-Vis DRS, XRD, FTIR, and SEM-EDX. A photocatalytic activity test on Congo red degradation was carried out using ultraviolet and visible lamps. The results of the characterization of the Mn-N-TiO2/Bentonite configuration show that the band gap energy of Mn-N- TiO2/Bentonite with a variation of 5 g has a band gap energy of 2.14 eV with anatase crystal form. In the IR spectrum, there is a shift in wave number from 1634.49 to 1433.11cm-1, there is the vibration of the NO bond, absorption below 1000 cm-1 indicates the presence of Mn-O bonds, and absorption at wave number 1049.28 cm-1 indicates the presence of ions. manganese metal trapped in the TiO2 matrix. This spectrum indicated the presence of manganese and nitrogen. These results were confirmed by the EDX instrument, which showed the presence of 0.60% Mn and 0.04% N. SEM results show that particles that are still agglomerated and have a large size, which is influenced by water vapor in the TiO2 crystal structure. The results showed that the photodegradation activity increased significantly up to 40.9075% at 30 minutes of irradiation for the Mn-N- TiO2/Bentonite composite and 20.0225% under exposure to ultraviolet light.
EFEKTIVITAS PENGGUNAAN GEOGEBRA UNTUK MEMBANTU SISWA SMP MEMAHAMI KONSEP BANGUN RUANG Nurhalisa, Sitti; Sirwanti, Sirwanti; Paronda, Naimah
JP2MS Vol 9 No 1 (2025): April
Publisher : Program Studi S1 Pendidikan Matematika FKIP Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/jp2ms.9.1.138-144

Abstract

Penelitian ini bertujuan untuk mengevaluasi sejauh mana GeoGebra efektif dalam mendukung pemahaman siswa SMP terhadap konsep bangun ruang. Desain penelitian yang diterapkan adalah kuasi-eksperimen dengan metode pre-test dan post-test. Subjek penelitian terdiri dari siswa kelas VIII di SMPN 5 Anggeraja, dengan data yang diperoleh melalui tes pemahaman konsep dan angket persepsi siswa. Hasil analisis menunjukkan bahwa penggunaan GeoGebra secara signifikan meningkatkan pemahaman siswa terhadap bangun ruang. Selain itu, siswa memberikan tanggapan positif terhadap GeoGebra karena fitur visualisasinya yang interaktif dan kemampuannya untuk meningkatkan motivasi belajar. Penelitian ini merekomendasikan penggunaan GeoGebra sebagai media pembelajaran untuk mempermudah penyampaian konsep-konsep abstrak secara konkret dalam pembelajaran matematika.
PENGARUH KEPEMIMPINAN TRANSFORMATIONAL KEPALA SEKOLAH TERHADAP PENINGKATAN KOMPETENSI GURU DAN KINERJA TENAGA KEPENDIDIKAN DI SEKOLAH ISLAM AL-IZHAR CENDEKIA MAKASSAR Nurhalisa, Sitti; Ansar; Arnidah
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 10 No. 02 (2025): Volume 10, Nomor 02 Juni 2025 t
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v10i02.26335

Abstract

Improving the quality of educational services in the digital era presents a significant challenge, especially for schools grounded in Islamic values such as Sekolah Islam Al-Izhar Cendekia Makassar. School principals are expected to adopt leadership styles that promote innovation, teacher professionalism, and the effectiveness of educational staff performance. This study aims to examine: (1) the influence of the principal’s transformational leadership on teacher competence; (2) the influence of transformational leadership on the performance of educational staff; and (3) the simultaneous influence of transformational leadership on both teacher competence and staff performance. This research is a quantitative study with an associative approach, conducted at Sekolah Islam Al-Izhar Cendekia Makassar. The population consisted of all teachers and educational staff, totaling 50 people, with a saturated sampling technique. Data were collected using a Likert-scale questionnaire and analyzed through multiple linear regression using SPSS 27. The results show that the school principal's transformational leadership has a positive and significant influence on teacher competence (49%), on staff performance (50.2%), and simultaneously contributes to improving the quality of educational services. In conclusion, transformational leadership is effective in creating a professional and conducive work environment in Islamic schools.
Co-Authors Ahmad Ridhay Ansar Arnidah Marsela, Anggi Ni Ketut Sumarni Paronda, Naimah Prismawiryanti Prismawiryanti Riski, Mutiara Zalfa Ruslan Sirwanti Sirwanti, Sirwanti