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All Journal EduChemia: Jurnal Kimia dan Pendidikan Chimica et Natura Acta Jurnal Pijar MIPA
Sani Widyastuti Pratiwi
Sekolah Tinggi Analis Bakti Asih Bandung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Utilization of Nata De Coco as Adsorben in Methyl Orange Adsorption Sani Widyastuti Pratiwi; Siska Novita Sari; Ratna Nurmalasari; Meli Indriani
EduChemia (Jurnal Kimia dan Pendidikan) Vol 5, No 2 (2020)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (470.51 KB) | DOI: 10.30870/educhemia.v5i2.7977

Abstract

Methyl Orange was a textile waste that polluted the environment and harmed aquatic ecosystems and human life. It could affect the photosynthesis of oxygen regeneration and disrupt the biological activity of microbes in the water. One of the ways to deal with these wastes by adsorption using  Nata de coco. Nata de coco was used as an alternative adsorbent made from cellulose, which was a waste of coconut water in the process of making it easy, inexpensive, and biodegradable. This study aims to determine the effect of contact time and mass of  Nata de coco adsorbents on the adsorption of methyl orange. This research method includes three stages were adsorbent preparation, adsorption, and UV-Vis spectrometer analysis. The adsorption process was carried out with contact time variations of 30 and 60 minutes, variations in the mass of the adsorbent 0.05g; 0.1g; and 0.15g. The results showed the optimum adsorption conditions occurred at 60 minutes of contact time and an adsorbent mass of 0.15g with an adsorption efficiency of 44.66% and an adsorption capacity of 0.2066 mg/g.
Pengaruh Pelarut dalam Berbagai pH pada Penentuan Kadar Total Antosianin dari Ubi Jalar Ungu dengan Metode pH Diferensial Spektrofotometri Sani Widyastuti Pratiwi; Anggit Ayu Priyani
EduChemia (Jurnal Kimia dan Pendidikan) Vol 4, No 1 (2019)
Publisher : Department of Chemical Education Faculty of Teacher Training and Education Universitas Su

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (182.282 KB) | DOI: 10.30870/educhemia.v4i1.4080

Abstract

Ubi jalar ungu berpotensi sebagai antioksidan alami berdasarkan tingginya kadar antosianin yang terkandung didalamnya. Antosianin adalah senyawa polar yang lebih mudah diekstrak dalam suasana asam. Antosianin memiliki manfaat sebagai antioksidan dan penangkal radikal bebas, sehingga berperan dalam mencegah terjadinya penuaan, kanker, dan penyakit degeneratif dan lain-lain. Tujuan dari penelitian ini untuk mengetahui pelarut dan pH yang tepat untuk mengekstrak antosianin ubi jalar ungu dengen metode pH diferensial spektrofotometri. Sampel ditambahkan etanol 96% dan aquades yang telah diasamkan dengan HCl 1% sehingga pH pelarut menjadi 1, 1,5, 2, dan 2,5. Ekstrak yang didapat diencerkan dengan pelarut pH 1 dan pH 4,5 dan kemudian ditentukan kadar antosianinnya berdasarkan metode pH diferensial spektrofotometri. Hasil penelitian menunjukkan bahwa pelarut dan pH berpengaruh terhadap kadar total antosianin. Pelarut etanol dan pH 1,5 memberikan kadar total antosianin dan absorbansi ubi jalar ungu tertinggi yaitu sebesar 5,9558 mg/L.
Optimasi Pembuatan Mikrokapsul Kalsium-Alginat-EDTA Sebagai Adsorben Untuk Logam Kadmium Sani Widyastuti Pratiwi; Ayu Triastuti; Ratna Nurmalasari; Inggis Pinarti
Jurnal Pijar Mipa Vol. 15 No. 4 (2020): September
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.795 KB) | DOI: 10.29303/jpm.v15i4.1894

Abstract

Cadmium was one of the metals classified in the type of nonessential heavy metal that classified as carcinogenic and is one of the pollutants in the environment, especially water. The content of cadmium in water tends to have very low levels, so certain techniques are needed to determine the level of pre concentration. In the pre concentration technique adsorbents were needed which could absorb cadmium, one of which is calcium-alginate microcapsule modified with EDTA. Calcium-alginate was  modified with EDTA to increase the ability of the microcapsule to absorb cadmium metal. The purpose of this study was to determine the optimum conditions for making Calcium-alginate-EDTA microcapsule in adsorbing cadmium. The stages of this research were optimization of Calcium-alginate-EDTA resin with variable in the form of Calcium chloride concentration (0.05 M; 0.1 M; 0.5 M; 1 M; and 2 M), EDTA mass (0.50 g ; 0.75 g; 1 g; 2 g and 2.5 g) and the concentration of sodium-alginate (0.5%; 1%, 1.5%; 2%, and 3%); Characterization of microcapsule functional groups by infrared spectrophotometry and determination of the retention capacity of Calcium-Alginate-EDTA microcapsule for cadmium absorption by atomic absorption spectrophotometry. The results of infrared characterization showed a change in transmittance in the functional groups C-O dan C-N that occurred in the microcapsule after binding to cadmium metal at wave number 1436.97 cm-1. The optimum conditions for making Calcium-alginate-EDTA resins were in conditions of 0.1 M Calcium chloride concentration, 1% sodium-alginate concentration and EDTA mass 0.75 g EDTA with retention capacity of  Cd was 0.0301 mg/g.
Karakterisasi Hasil Reaksi Ion Gadolinium (III) dengan Ligan Dibutilditiokarbamat Menggunakan Metode Mekanika Molekular (MM2) Sani Widyastuti Pratiwi; Anni Anggraeni; Husein H. Bahti
Chimica et Natura Acta Vol 10, No 2 (2022)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v10.n2.19139

Abstract

Gadolinium dalam bentuk murni memiliki nilai ekonomis tinggi banyak digunakan untuk keperluan industri, kedokteran, kimia,dan metalurgi. Dibutilditiokarbamat merupakan ligan dengan dua atom sulfur yang berperan sebagai donor atom sehingga dapat membentuk kompleks dengan gadolinium. Dengan simulasi dinamika molekul dapat mempelajari sifat makroskopik suatu sistem melalui simulasi mikroskopik Dalam penelitian ini akan diprediksikan struktur dari senyawa gadolinium(III) dibutilditiokarbamat berdasarkan energi sterik yang dihasilkan dari dinamika molekul dalam berbagai pelarut. Dalam penentuan struktur ini digunakan metoda mekanika molekul (MM2) dengan perangkat lunak CS ChemBio3D Ultra 12.0. Dinamika molekul diatur pada suhu  25°C dengan variasi pelarut. hasil dinamika molekul dari senyawa gadolinium(III) dibutilditiokarbamat menunjukan bahwa energi sterik paling rendah berada pada bilangan koordinasi tujuh pada pelarut asetonitril dengan energi sterik sebesar 136,7473 kkal/mol.
Optimization time and mass of eggshell adsorbent in improving waste cooking oil quality Sani Widyastuti Pratiwi; Srie Gustiani; Kenanga Triulfa Amadea; Ratna Nurmalasari; Inggis Pinarti
Jurnal Pijar Mipa Vol. 17 No. 5 (2022): September 2022
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v17i5.3654

Abstract

Oxidation and hydrolysis damage to cooking oil can occur due to repeated use of cooking oil. Adsorption by utilizing eggshells, which contain high calcium carbonate and have a natural pore structure that can improve the quality of used cooking oil. This study aims to determine the physical properties and characteristics of the thermally activated chicken eggshell adsorbent and to determine the ability of the adsorbent to absorb acid and metal cadmium. The steps carried out in this study were the manufacture of adsorbents, quality tests of the adsorbents produced, and testing of adsorbents on used cooking oil samples based on acid numbers and decreasing levels of metal cadmium in the samples. The adsorption process of used cooking oil was carried out with variations in the mass of the adsorbent, namely 5, 7, 9, and 11 grams, and stirring time for 10, 20, 40, and 60 minutes. Based on the results of the study, it was found that the optimum conditions for decreasing the acid number with the use of an adsorbent mass of 11 grams and a stirring time of 60 minutes resulted in an acid number was 0.9974 mg NaOH/g with a decrease in the acid number of 76.54%, while for cadmium metal it decreased by 100% with adsorption capacity of 2.57124 mg/g.
Co-Authors Anggit Ayu Priyani Anni Anggraeni Ayu Triastuti Husein H. Bahti Inggis Pinarti Inggis Pinarti Kenanga Triulfa Amadea Meli Indriani Nurmalasari, Ratna Ratna Nurmalasari Sari, Siska Novita Srie Gustiani