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All Journal JURNAL KIMIA SAINS DAN APLIKASI Jurnal Pendidikan Kimia Indonesia Indonesian Journal of Chemistry Indonesian Journal of Pure and Applied Chemistry SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan JURNAL EDUCATION AND DEVELOPMENT GERVASI: Jurnal Pengabdian kepada Masyarakat JURNAL PENDIDIKAN MIPA Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Jurnal Pengabdian kepada Masyarakat Nusantara Hydrogen: Jurnal Kependidikan Kimia J-ABDIPAMAS (Jurnal Pengabdian Kepada Masyarakat) Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) JIPI (Jurnal IPA dan Pembelajaran IPA)

Risya Sasri

Universitas Tanjungpura

Author-ID : 3235891

Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Engineering Environmental Science Health Professions Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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PENGOLAHAN AIR BERSIH MENGGUNAKAN BAHAN BAKU LOKAL UNTUK DAERAH PESISIR TERPENCIL DI KABUPATEN KUBU RAYA Nelly Wahyuni; Risya Sasri; Rudiyansyah Rudiyansyah; Thamrin Usman; Kiki Prio Utomo
GERVASI: Jurnal Pengabdian kepada Masyarakat Vol 4, No 2 (2020): GERVASI: Jurnal Pengabdian Kepada Masyarakat
Publisher : LPPM IKIP PGRI Pontianak

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31571/gervasi.v4i2.1836

Air bersih merupakan kebutuhan utama bagi manusia. Masyarakat yang mengalami kesulitan mendapatkan air bersih umunnya adalah masyarakat miskin yang berada di wilayah pedesaan. Sumber air utama bagi masyarakat terpencil di pesisir Kabupaten Kubu Raya, Kalimantan Barat berasal dari muara Sungai Kapuas. Air tersebut merupakan air gambut dan payau. Penerapan teknologi dalam pembangunan sarana air bersih harus disesuaikan dengan tingkat kondisi sosial, budaya, dan ekonomi masyarakat. Tujuan kegiatan pengabdian kepada masyarakat ini pembuatan sarana pengolahan air bersih dengan metoda filtrasi menggunakan media filter dari bahan baku lokal. Metoda pelaksanaan berupa pelatihan penggunaan media filtrasi berupa pasir koral, kaolin, dan karbon aktif dalam pengolahan air. Berdasarkan evaluasi kegiatan, penggunaan bahan lokal yang murah, mudah didapat dan diolah pada pengolahan air akan sangat bermanfaat bagi masyarakat di daerah pesisir. Hal ini juga sangat mendukung proses keberlangsungan dan keberlanjutan penggunaan instalasi pengolahan air oleh masyarakat secara mandiri.

Application of Titanium-Silica-Graphite Composite Material for Photocatalytic Process of Methylene Blue Lia Destiarti; Risya Sasri
Indonesian Journal of Chemistry Vol 20, No 6 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.48998

The use of TiO2 in the slurry system for the photocatalytic process has disadvantages. It causes the resistance of UV transmission because it is cloudy and the difficulty for obtaining the catalyst at the end of the process. Therefore, an attempt to overcome this was conducted by compositing TiO2 on SiO2. Furthermore, carbon material can be used as a support material for TiO2-SiO2, so that the mixed materials can be used as a photocatalyst. The methods for synthesis the material was a sol-gel method by varying the composition of TiO2-SiO2/graphite, which was 1:1; 1:2; and 2:1. The material obtained was characterized by FTIR, DRUV, XRD, and SEM. Photocatalytic activity of the synthesized material was tested in methylene blue solution whereas the quantitative data derived from UV-Vis spectrometry measurement. Photocatalyst activity was carried out by varying the degradation time of 30–180 min. The FTIR spectrum showed that O-H (~3400 cm–1) and C-O (~1100 cm–1) are the major groups in the synthesized materials. The value of bandgap energy (Eg) were 4.15, 4.20, 5.22, and 5.19 eV for TiO2-SiO2, TiO2-SiO2/G (1:1; 1:2; and 2:1) composites, respectively. The XRD pattern of TiO2-SiO2 showed that the highest peaks of 2q were observed at 25.32, 37.71 and 47.91°. Graphite identity appeared at 2q = 59.87°. Micrograph of SEM showed a homogenous dispersion of spherical particles in the materials. Photocatalytic test results showed that TiO2-SiO2/G with a composition of 2:1 has the highest percentage of methylene blue degradation, which reached 94% at 180 min.

ANALISIS UKURAN PARTIKEL SILIKA HASIL EKSTRAKSI DARI BATU PADAS ASAL KABUPATEN KETAPANG KALIMANTAN BARAT Risya Sasri; Nurlina Nurlina; Lia Destiarti; Intan Syahbanu
Indonesian Journal of Pure and Applied Chemistry Vol 1, No 1 (2018)
Publisher : Tanjungpura University

Analysis of particle size of silica was extracted from rocks from Ketapang Regency, West Kalimantan based on characterization using scanning electron microscope (SEM) have been carried out. The analysis was performed to determine the particle size change in extraction silica without and with activation using acid solution. SEM image processing was performed on a 10 μm scale at 350x magnification through the image-J software to determine the particle size distribution. The results of the analysis showed that the area and diameter of the silica particle extracted from rocks were 3,935 μm2 and 3,147 μm (without activation) and 4,28 μm2 and 3,267 μm (activated) respectively.

SEMIKONDUKTOR BERBASIS TiO2-N/KAOLIN TERKALSINASI UNTUK DYE SENSITIZED SOLAR CELL (DSSC) Sabrina Maulidya Amir; Titin Anita Zahara; Risya Sasri; Winda Rahmalia
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Semikonduktor TiO2 sebagai anoda dalam dye sensitized solar cell (DSSC) memiliki kelemahan yaitu hanya aktif bekerja pada radiasi sinar UV karena energi celah pita (Eg) TiO2 yang relatif besar yaitu 3,2 eV. Pada penelitian ini, dilakukan modifikasi untuk mengubah struktur elektronik TiO2, agar dapat menurunkan Eg. Dalam penelitian ini, TiO2 didoping menggunakan atom N dari NH4OH dan kaolin terkalsinasi (KT) yang disintesis dari kaolin Capkala. Beberapa parameter yang dibahas yaitu karakteristik TiO2-N/KT hasil pendopingan, penurunan energi celah pita dari semikonduktor, dan hubungan antara Eg dari semikonduktor terhadap randemen konversi energi maksimum DSSC yang dihasilkan. Dye yang digunakan dalam penelitian ini adalah ekstrak kayu secang. Difraktogram XRD TiO2-N/KT menunjukkan posisi 2θ = 25,2790o yang menunjukkan keberadaan TiO2 dan 2θ = 26,6090oyang menunjukkankeberadaan SiO2 dari kaolin terkalsinasi. Analisis dengan FTIR menunjukkan penyerapan pada bilangan gelombang 680 cm-1 yang menunjukkan vibrasi ikatan Ti-N dan 1036,77 cm-1 yang menandakan bahwa adanya vibrasi regangan asimetris O-Si-O dan O-Al-O. Terjadi penurunan Eg dari 3,2 eV (TiO2 murni) menjadi 3,03 eV (TiO2-N/KT). Penurunan energi celah pita sebanding dengan besarnya randemen konversi energi maksimum dari sel surya yang dihasilkan yaitu sebesar 1,048 %, menunjukkan performansi lebih baik dibanding dengan DSSC dengan komponen anoda TiO2 murni (0,661%)

Synthesis and Characterization of Trimethylchlorosilane-Modified Silica Xerogel Sellen Tanheitafino; Anis Shofiyani; Risya Sasri; Rudiyansyah Rudiyansyah
Jurnal Kimia Sains dan Aplikasi Vol 23, No 7 (2020): Volume 23 Issue 7 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Modification of silica xerogel with TMCS (trimethylchlorosilane) reagent has been carried out to improve the hydrophobicity of silica xerogel. Silica xerogel was synthesized based on the sol-gel method using sodium silicate as a precursor, and citric acid as a catalyst, with a mole ratio of sodium silicate and citric acid, was 0.172: 0.004. The sol-gel process was carried out through several stages, i.e., hydrolysis and condensation of sodium silicate to form sol, gelation (sol transition to gel), aging, and drying. Surface modification was performed by studying the effect of TMCS: methanol: petroleum benzine volume ratio of 0.5:1:1, 1:1:1, 1.5:1:1, 2:1:1, and 2.5:1:1 on the characteristics of silica xerogel synthesized. FTIR, SEM, and GSA characterized the synthesized results. The results of FTIR characterization on silica xerogel with volume ratios of 2:1:1 and 2.5:1:1 indicate the presence of the Si‑C group absorption at a wavenumber of 848.68 cm-1 which shows that the formation of silyl groups on the modified silica xerogel surfaces occurs at a TMCS: methanol: petroleum benzine ratio of 2:1:1 and 2.5:1:1. SEM results indicate that the silica xerogels produced are porous. Meanwhile, the GSA analysis results show that the pore size distributions are in the mesoporous region with an average pore radius of 8-13 nm. The greater the volume of TMCS used, the higher the surface area, and the resulting xerogel’s hydrophobicity. Based on the contact angle and seeped time test, the highest hydrophobicity is produced by the material synthesized at a TMCS: methanol: PB volume ratio of 2.5:1:1 with a contact angle of 116.346°.

Synthesis of Metal–Curcumin Complex Compounds (M = Na⁺, Mg²⁺, Cu²⁺) Peni Peni; Risya Sasri; Imelda Hotmarisi Silalahi
Jurnal Kimia Sains dan Aplikasi Vol 23, No 3 (2020): Volume 23 Issue 3 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Curcumin complex compound, MLn (L = curcumin; M = Na+, Mg2+, Cu2+) has been synthesized from the reaction between curcumin and metal precursors (NaCl, MgSO4.7H2O, CuCl2.2H2O) in ethanol under reflux conditions. Synthesis takes place through the reaction between the metal ions Na+, Mg2+, or Cu2+ as the central atom and curcumin as the ligand. Curcumin has been consumed after the reaction lasts for four hours, shown by thin-layer chromatography in which a new spot appears at higher Rf as the spot of curcumin disappears in the reaction mixture. Compared with the spectrum of curcumin, the FTIR spectra of the complexes show changes in the absorption bands and shifts of wave numbers particularly in absorption bands of phenolic –OH and C=O enol groups which strongly indicates the coordination of metal ions with the curcumin ligand which is proposed to be in β–1,3 diketone system. Also, the FTIR spectra of the reaction product showed typical absorption bands for the metal-oxygen group, M–O, at 524 cm–1, 670 cm–1 and 470 cm–1 in Na+–curcumin, Mg2+–curcumin and Cu2+–curcumin, respectively.

Bandgap Energy of TiO2/M-Curcumin Material (M = Na+, Mg2+, Cu2+) Imelda Hotmarisi Silalahi; Risya Sasri; Peni Peni; Titin Anita Zaharah
Jurnal Kimia Sains dan Aplikasi Vol 25, No 1 (2022): Volume 25 Issue 1 Year 2022
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Bandgap energy (Egap) of TiO2/curcumin as well as TiO2/M-curcumin (M = Na+, Mg2+, Cu2+) was determined. The material was prepared on transparent conductive oxide as TiO2 film. Then, the curcumin and curcumin derivatives were adsorbed on TiO2 surface by immersing the film in solution of the compounds. The diffuse reflectance UV-Vis spectra of the materials were recorded and utilized to calculate the Egap using the Tauc plot method. The calculation gave the Egap of TiO2 of 3.27 eV that lowers after being deposited with curcumin and metal-curcumin compounds. The Egap of TiO2/curcumin was 2.82 eV, while TiO2/Na+-curcumin, TiO2/Mg2+-curcumin, and TiO2/Cu2+-curcumin were 2.36, 3.11, and 2.15 eV, respectively. Curcumin metal complexes, i.e., TiO2/Cu2+-curcumin, showed high molar absorptivity and effectively deposited on the TiO2 lowers the bandgap energy of TiO2 compared to free-curcumin on TiO2.

Practical Guide for Determining the Reaction Rate and Reaction Order Based on the Colorimeter® Application Azwa Fadilla Wafiq; Husna Amalya Melati; Erlina; Hairida; Masriani; Risya Sasri
Jurnal Pendidikan Kimia Indonesia Vol. 6 No. 2 (2022)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jpki.v6i2.50365

The practical activities needed in chemistry lessons. However, during the covid-19 pandemic, a suitable practical guide is needed. Therefore, a practical guide that can involve students directly in practical activities in online learning and blended learning is needed. The purpose of this study is to determine the feasibility of the Practical Guide for Determining Reaction Rate and Reaction Order Based on the Colorimeter® Application based on expert judgement and students’ response. This study employs a research and development (R&D) using 4D(Four-D) model, starting from define, design, develop, and dissemination stages. This research is limited to the develop stage due to the limited time and ability of the researcher. The subject of this study was a practical guide which was tested to 6 students in the initial trial and 20 students of Chemistry Education FKIP Untan in the main trial. Data collection tools used are the feasibility assessment sheets and students’ response questionnaires. The results of expert assessment using the Gregory test closeness model indicate a very feasible criteria with the validity value of 1.00 which in a very high level in terms of the feasibility of the content, language, and graphics. The result of the initial trial and main trial obtained an average percentage of 91% and 94% respectively with very good criteria. The results of this study imply that the practical guide developed is suitable for use in the practical activities. In addition, the practical guide has an attractive appearance and can be used in practical activities to support students’ understanding of reaction rates’ concepts.

Synthesis of Reduced Graphene Oxide-Bentonite Composite and Its Application as a Lead(II) Ion Adsorbent Bartholomeus Lavelim; Lia Destiarti; Adhitiyawarman Adhitiyawarman; Risya Sasri
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.67993

The use of reduced graphene oxide (rGO) as an adsorbent has challenges to overcome. Although rGO has a large surface area, its solubility in water is very low. In this study, bentonite is added to reduce the use of rGO mass and increase the dispersibility of the adsorbent. The rGO-bentonite (rGOB) was characterized by XRD, FTIR, SEM-EDX, and XRF. The adsorption activity was tested in a Pb ion solution, derived from AAS. The XRD pattern of GO, rGO, and rGOB of 2q were observed at 10.90°, 24.88°, and 26.66°, respectively. The FTIR spectrum showed that GO has C=C, C-O, C=O, and O-H, while in rGO, C=O disappears, and there was a significant decrease in the O-H and C-O peaks. The rGOB has identical spectra with rGO and yet has an additional peak from bentonite O-Si-O. The GO and rGO form agglomerate while rGOB looks more dispersed. The C/O ratio increases from GO to rGO because of the reduction process. The bentonite is Ca-bentonite with main components Al2O3, SiO2, and CaO. The results showed that the rGOB composite could reduce the use of rGO by up to 80% and have an adsorption performance similar to rGO with an adsorption capacity of 217 mg/g.

Peluang Mobilitas Internasional Dalam Usaha Peningkatan Kompetensi dan Wawasan Sivitas Akademika Pendidikan Kimia Universitas Tanjungpura Rini Muharini; Hairida Hairida; Eny Enawaty; Masriani Masriani; Rachmat Sahputra; Rody Putra Sartika; Tulus Djunanto; Ira Lestari; Andi I. Harun; Erlina Erlina; Maria Ulfah; Risya Sasri
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 4 No. 2 (2023): Jurnal Pengabdian kepada Masyarakat Nusantara (JPkMN)
Publisher : Cv. Utility Project Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v4i2.489

Kementerian pendidikan, kebudayaan, riset dan teknologi telah mengeluarkan kebijakan agar seluruh perguruan tinggi di Indonesia melakukan transformasi pendidikan tinggi sesuai dengan delapan indikator kinerja utama perguruan tinggi yang salah satunya adalah internasionalisasi perguruan tinggi. Pencapaian tersebut diperoleh dari mobilitas dan kerja sama internasional yang dilakukan oleh sivitas akademika, yaitu dosen dan mahasiswa. Program studi pendidikan kimia FKIP universitas Tanjungpura berupaya berkonstribusi melalui mobilitas internasional dosen dan mahasiswa. Namun, kendala yang dihadapi adalah rendahnya kemampuan berbahasa asing dan minimnya informasi mengenai peluang mobilitas dan kerja sama internasional ini di kalangan mahasiswa. Hal ini menyebabkan rendahnya motivasi mahasiswa dalam berpartisipasi dalam kegiatan berskala internasional. Melihat hal itu, program pengabdian kepada masyarakat kepada para mahasiswa mengenai peluang mobilitas internasional dilaksanakan agar membuka wawasan dan meningkatkan motivasi mahasiswa. Kegiatan ini dilakukan dengan mengundang narasumber yang berkompeten dan membagikan angket kuisioner dan wawancara untuk mendapatkan respon dan pendapat mahasiswa mengenai kegiatan ini. Peluang dan strategi perolehan kerja sama dan hibah dari organisasi internasional, terutama eropa, disampaikan dengan gamblang oleh narasumber. Respon sangat positif diberikan oleh mahasiswa. Data angket kuisioner dan interview memperlihatkan bahwa mahasiswa termotivasi untuk meningkatkan kemampuan bahasa asingnya dan memiliki kemauan untuk terlibat dalam mobilitas internasional.

Co-Authors AA Sudharmawan, AA Adhitiyawarman, Adhitiyawarman Ajuk Sapar Ajuk Sapar4 Andi I. Harun Andi Ifriany Andi Ifriany Harun Andy Ifriany Harun Azwa Fadilla Wafiq Bartholomeus Lavelim Bella Agustina Clara Elga Juliandha Eni Mayasari Eny Enawati Eny Enawaty ERLINA Erlina Erlina Erlina Erlina Erlina Fia Tiaraseta Hairida Hairida Husna Amalya Melati Husna Amalya Melati Husna Amalya Melati* Ida Lestari Imelda Hotmarisi Silalahi Intan Syahbanu Ira Lestari Irene Yudea Listra Khofifah Aditha Parawansa Khofifah Aditha Parawansa Kiki Prio Utomo Lia Destiarti Maria Ulfah Marisa Marisa Masriani . Melur Regista Cahyani Muhammad Farras Leonasa Agusta Nelly Wahyuni Noval Lerian Nur Riska Safitri Nurlina, Nurlina Peni Peni Peni Peni Pingkan Ramadhan Sailendra Rachmat Sahputra Rachmat Sahputra Rachmat Sahputra Rachmat Saputra Rahmat Rasmawan Rikah Indriyani Rini Muharini Rody Putra Sartika Rudiyansyah Rudiyansyah Rudiyansyah Rudiyansyah Sabrina Maulidya Amir Sellen Tanheitafino Shofiyani, Anis Thamrin Usman Titin Anita Zahara Titin Anita Zaharah Tulus Djunanto Tulus Junanto Tya Daniela Winda Rahmalia

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