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All Journal Jurnal Kimia Riset Alotrop Jurnal Pendidikan dan Ilmu Kimia JMM (Jurnal Masyarakat Mandiri) Logista: Jurnal Ilmiah Pengabdian Kepada Masyarakat Molekul: Jurnal Ilmiah Kimia ALKIMIA : Jurnal Ilmu Kimia dan Terapan Jurnal Inovasi Teknik Kimia Journal of Appropriate Technology for Community Services Bubungan Tinggi: Jurnal Pengabdian Masyarakat Konservasi Hayati Jurnal Ilmiah Berkala: Sains dan Terapan Kimia Nanggroe: Journal Of Scholarly Service Nanggroe: Journal of Scholarly Service Jurnal Pengabdian Kesehatan Beguai Jejama Jurnal Sains Materi Indonesia Jurnal Bioteknologi & Biosains Indonesia (JBBI)

Retno Agnestisia

Program Studi Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Palangka Raya

Author-ID : 221125

Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Public Health Social Sciences Other

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PEMANFAATAN SELULOSA DARI KULIT UMBUT ROTAN (Calamus sp) SEBAGAI ADSORBEN METILEN BIRU Nyahu Rumbang; Whendy Trissan; Karelius Karelius; Retno Agnestisia
Jurnal Sains dan Terapan Kimia Vol 15, No 2 (2021)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Kulit umbut rotan merupakan bahan berlignoselulosa. Kandungan selulosa yang cukup tinggi pada kulit umbut rotan, menjadikan selulosa kulit umbut rotan (Calamus sp) dapat dipertimbangkan sebagai sumber adsorben metilen biru. Persiapan Sampel Kulit Umbut Rotan (Calamus sp) dimulai dari pemotongan, pengeringan, penghalusan, dan pengayakan 60 mesh hingga diperoleh sampel kulit umbut rotan yang selanjutnya akan dilakukan isolasi selulosa. Dilanjutkan tahapan untuk memisahkan selulosa kulit umbut rotan (Calamus sp) dari komonen-komponen kimia yang lain dapat menggunakan pelarut NaOH 20% panas. Tahap terakhir adalah Uji adsorpsi terhadap metilen biru dilakukan dengan kajian pengaruh pH, kinetika adsorpsi dan kesetimbangan adsorpsi terhadap serbuk kulit umbut rotan dan selulosa kulit umbut rotan. Isolasi selulosa dari kulit umbut rotan dapat dilakukan dengan menggunakan pelarut basa (NaOH) panas yang dapat menyerang dan merusak struktur lignin pada bagian kristalin dan amorf serta memisahkan sebagian hemiselulosa. Proses adsorpsi serbuk selulosa kulit umbut rotan terhadap metilen biru mencapai optimum pada pH 8, dengan waktu optimum 40 menit. Kajian kinetika dan kesetimbangan adsorpsi menunjukkan bahwa adsorpsi metilen biru oleh selulosa kulit umbut rotan mengikuti kinetika orde dua semu dengan pola isoterm Langmuir.

ADSORPSI FOSFAT (PO43-) MENGGUNAKAN SELULOSA PURUN TIKUS (Eleocharis dulcis) TERMODIFIKASI HEKSADESILTRIMETILAMMONIUM BROMIDA (HDTMABr) Retno Agnestisia; Noer Komari; Sunardi Sunardi
Jurnal Sains dan Terapan Kimia Vol 6, No 1 (2012)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Kajian preparasi, modifikasi dan uji adsorpsi selulosa purun tikus (Eleocharis dulcis) asal Handel Bakti, Kalimantan Selatan terhadap senyawa anionik fosfat (PO43-) telah dilakukan. Modifikasi selulosa dilakukan dengan rekayasa permukaan menggunakan surfaktan kationik heksadesiltrimetilamonium bromida (HDTMABr). Selulosa hasil modifikasi dianalisis menggunakan spektroskopi FTIR (Fourier Transform Infrared) dan derajat substitusi (DS) ditentukan dengan metode titrasi. Parameter adsorpsi yang dipelajari meliputi penentuan pH optimum, waktu kontak dan kapasitas adsorpsi dari sampel selulosa terhadap fosfat (PO43-). Hasil penelitian menunjukan bahwa selulosa termodifikasi surfaktan kationik merupakan adsorben yang baik untuk mengadsorpsi fosfat (PO43-) dengan derajat substitusi sebesar 1,24. Adsorpsi optimum dicapai pada pH 3 dan waktu kontak 60 menit pada selulosa dan 15 menit pada selulosa termodifikasi. Adsorpsi fosfat (PO43-) mengikuti isoterm Langmuir dengan kapasitas adsorpsi (qm) untuk selulosa, Sel-HDTMA-1 dan sel-HDTMA-2 berturut-turut sebesar 2,36 mg/g, 16,95 mg/g dan 20,83 mg/g. Kata kunci : selulosa, HDTMABr, senyawa fosfat (PO43-), adsorpsi.

BENTONIT TERMODIFIKASI MAGNETIT DAN APLIKASINYA SEBAGAI ADSORBEN Hg(II) Retno Agnestisia; Narsito Narsito; Suyanta Suyanta
Jurnal Sains dan Terapan Kimia Vol 10, No 1 (2016)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Characteristics and Chemical Composition of Fly Ash From Pulang Pisau’s Power Plant as A Potential Material for Synthesis of Aluminosilicate Materials Rendy Muhamad Iqbal; Akhmad Damsyik; Retno Agnestisia; Siswo Siswo
Jurnal Sains dan Terapan Kimia Vol 16, No 2 (2022)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v16i2.12191

The Steam-Electric Power Station (PLTU) is one of the initiatives to meet the nation's current electricity requirements. The use of fuel for steam power plant is still dominated by fossil fuels such as coal. Even though domestic energy needs are met, steam power plant turns out to be a contributor to gas emissions that cause global warming, as well as a by-product in the form of fly ash which can cause environmental and ecosystem problems. Fly ash contains silica oxide (SiO2) and aluminum oxide (Al2O3) compounds which can be used as raw materials for synthesizing aluminosilicate-based materials such as geopolymers and zeolites. This study tested the characteristics and composition of chemical compounds in fly ash from Pulang Pisau’s power plant, Central Kalimantan. Characterization using X-Ray Diffraction (XRD) showed that peaks of quartz material dominated fly ash from Pulang Pisau’s power plant at 2θ=20.82°;26.61° and mullite minerals at 2θ= 31.2°;33.1°; 35.4°;39.2°;59.8°. The results of the chemical compound composition were tested using the ASTM-D3682-12 standard. Fly ash has a composition of 29.00% SiO2, 9.98% Al2O3, 13.75% Fe2O3, and 28.37% CaO. Fly ash from Pulang Pisau’s power plant is classified as type C fly ash, which can potentially be used as a source of aluminosilicate-based material synthesis.

SINTESIS DAN KARAKTERISASI MAGNETIT (Fe3O4) SERTA APLIKASINYA SEBAGAI ADSORBEN METHYLENE BLUE Retno Agnestisia
Jurnal Sains dan Terapan Kimia Vol 11, No 2 (2017)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Synthesis, characterization and adsorption study of magnetite have beenconducted. Magnetite was synthesized by coprecipitation method. The characterizations of magnetite were carried out with spectroscopy FTIR (Fourier Transform Infrared) and XRD (X-ray diffraction). The adsorption study was conducted using a batch system with the studied adsorption study including optimum pH, optimum contact time and adsorption equilibrium. The results showed that coprecipitation method has succeeded to form magnetite that has magnetism properties. Magnetite can adsorbed methylene blue from aqueous phase, with the maximum adsorption at pH 5 and contact time of 90 minutes. Adsorption of methylene blue by magnetite follows the adsorption pattern of the Langmuir isotherm with the adsorption energy of 25.59 kJ/mol and adsorption capacity of 43.86 mg/g. The results of magnetite synthesis can accelerate the process of separating the adsorbent particles in a methylene blue solution using an external magnetic field.Keywords : magnetite, coprecipitation, adsorption, and methylene blue.

Utilization of Ferrate Ion (FeO42-) as Oxidizing Agent for Reducing Color Intensity of Peat Water Retno Agnestisia; Karelius Karelius; Rendy Muhamad Iqbal; Dyah Ayu Pramoda Wardani; Midun Efendi Patar Sihombing; Sri Yulandari Simangunsong; Junita Dongoran
Jurnal Sains dan Terapan Kimia Vol 17, No 2 (2023)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jstk.v17i2.14832

Peat water from Central Kalimantan is generally yellow to brownish-red in color. It causes peat water to not be used as a source of water for daily needs. Humic acid, fulvic acid, and humin are organic compounds that cause peat water to become colored. One alternative step that can be taken for reducing the color intensity of peat water is to degrade color-causing organic compounds by using an oxidizing agent. A hexavalent form of iron ion (Fe6+), commonly called ferrate (FeO42-) in potassium ferrate compound, is a powerful oxidizing agent used in the present study. Potassium ferrate (K2FeO4) was synthesized by a wet oxidation method and characterized using a UV-Vis spectrophotometer and an X-Ray Diffractometer (XRD). The ferrate solution is purplish-red in color with a maximum wavelength of 510 nm. The XRD pattern shows strong diffraction peaks at 2θ which are characteristic of K2FeO4. The ferrate solution was then used to degrade color-causing organic compounds in the peat water from Central Kalimantan. Determination of the optimum degradation conditions was monitored by the absorbance decrease of organic compounds in peat water at a wavelength of 370 nm. The results showed that ferrate solution with a concentration of 80 ppm was able to degrade organic compounds in peat water at pH 8, with a removal efficiency of 100%. Keywords: oxidizing agent, ferrate ion (FeO42-), peat water

Co-Authors Abdul Hadjranul Fatah Abdul Hadjranul Fatah Abed Nego Purba Abudarin Abudarin Abudarin Abudarin Adventus Panda Akhmad Damsyik Akhmad Damsyik Alfanaar, Rokiy Ansori Rahman Ariska, Risya Ayuchecaria, Noverda Chuchita Damsyik, Akhmad Deni Shidqi Khaerudini Desimaria Panjaitan Dessy Analinta Dewi, Sintia Ayu Diah Ayu Pramoda Wardani Dicky Perwira Ompusunggu Edy Prasetyo Eka Jhonatan Krissilvio Eka Jhonatan Krissilvio Elsandika, Gabriela Erwin Prasetya Toepak Erwin Prasetya Toepak Erwin Prasetya Toepak Erwin Prasetya Toepak F. Adany Frans Grovy Naibaho Hakim, Muh. Supwatul I Made Sadiana I Nyoman Sudyana I Nyoman Sudyana I Nyoman Sudyana I Nyoman Sudyana I Nyoman, Sudyana, Ilham Maulana Indri Susanti Iqbal, Rendy Muhamad Ivan Permana Putra Jumiati Jumiati Junita Dongoran Karelius Karelius Karelius Karelius Karelius Karelius Karelius, Karelius Marvin Horale Pasaribu Midun Efendi Patar Sihombing Mokhamat Ariefin Muhamad Iqbal, Rendy Muhammad Irmawan Narsito Narsito Noer Komari Nyahu Rumbang Oksal, Efriyana Okta Prianus Prianus, Okta Purba, Abed Nego Rasidah Rasidah, Rasidah Remi Ayu Pratika Rendy Muhamad Iqbal Rendy Muhamad Iqbal Rendy Muhamad Iqbal Riandy Putra Risfiah Ruli Cahyani Rizki Rachmad Saputra Rizkita, Aden Dhana Sinaga, Tiara Cristy Agatha Siswo Siswo Soaloon Sinaga Sri Yulandari Simangunsong Sugeng Mashabhi sunardi sunardi Sunardi Sunardi Suyanta Suyanta Syahrul Razikin Tampubolon, Mulani Jeni Lestari Wahyu Nugroho Wahyu Supriyati Wayan Adhi Nareyasa Whendy Trissan Widya Krestina, Luqman Hakim, Dyah Ayu Pramoda Wardani, Wulandari, Ika Octavia Yanetri Asi Nion, Yanetri Asi Yuliana Yuliana Yuliana Zimon Pereiz

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