Stannum : Jurnal Sains dan Terapan Kimia <p>Jurnal Sains dan Terapan Kimia published research article, minireview/review, and short communication that included studies in Inorganic Chemistry, Organic Chemistry, Analitycal Chemistry, Biochemistry, Physical Chemistry, Computational Chemistry, Chemical Engineering, and Applied Chemistry</p> Department of Chemistry - Universitas Bangka Belitung en-US Stannum : Jurnal Sains dan Terapan Kimia 2714-674X Effectiveness of Matoa Leaf (Pometia pinnata) Extract as an Antibacterial Staphylococcus epidermidis <p>A natural alternative that can be used to inhibit the growth of <em>Staphylococcus epidermidis</em> bacteria is matoa leaves (<em>Pometia pinnata</em>). Matoa leaves contain secondary metabolites such as flavonoids, tanins, and saponins which are known as an antibacterial. The purpose of this study was to determine the effectiveness of matoa leaves extract as an antibacterial agent for <em>Staphylococcus epidermidis</em>. This study used the disc diffusion method, using deodorant as a positive control, aquadest as a negative control and concentration variations matoa leaves extract of 15%, 20%, 25% and 30%. The matoa leaves were extracted using the maceration method with 96% ethanol. Antibacterial testing in this study was characterized by a clear zone or zone of inhibition around the disc paper. The results of the antibacterial test in this study have to different inhibition zones, that is a sample concentration of 15% the inhibition zone value is 0,125 mm. The sample concentration of 20% the inhibition zone is 3 mm. The sample concentration of 25% the inhibition zone&nbsp; is 2,312 mm and the sample concentrasion of 30% the inhibition zone is 0,875 mm. The extract of matoa leaves can be used as an antibacterial, because according to Pan Chen Wu Tang and zao (2009) the extract of matoa leaves could be applied as inhibitor of the growth of <em>Staphylococcus epidermidis</em> at a sample concentration of 20% is in the weak to moderate category</p> Rossalinda Rossalinda Fitria Wijayanti Damayanti Iskandar ##submission.copyrightStatement## 2021-04-30 2021-04-30 3 1 1 8 10.33019/jstk.v3i1.2133 SYNTHESIS AND CHARACTERIZATION OF KAOLIN-TiO2 FROM ILMENITE BANGKA COMPOSITE FOR PHOTODEGRADATION OF RHODAMIN B DYE <p><sub></sub></p> <p>The synthesis and characterization of kaolin-TiO2 from ilmenite composite as a degradation of rhodamine B dye was prepared. Natural kaolin from Air Bara, Central Bangka and ilmenite from BPM Unit Metalurgi PT. Timah (Persero), Tbk., Mentok Bangka Belitung. The kaolin sample was chemically activated and the ilmenite was carried out leaching with acid (HCl), then the ilmenite was calcined at temperature of 700°C to obtain the anatase phase. Synthesis of kaolin-TiO2 from ilmenit using the precipitation method using ethanol as a solvent, the composite using with 3 variation of kaolin mass i.e 0,2; 0,4 and 0,6 (w/w). The fungsional groups and the phase structure of kaolin-TiO2 from ilmenite was analyzed using FTIR and XRD, then the composite was applied to rhodamine B solution to determine the percentage of degradation in the solution by UV-Vis Spectrophotometry analysis. Degradation was carried out by adding 150 mg kaolin-TiO2 to 25 mL of rhodamine B solution and degradation process by irradiating UVC light. Based on FTIR and XRD data should that kaolin-TiO2 from ilmenite was formed composite. The optimum variation of kaolin mass in the composite composition of 0,4:3 (w/w). Based on UV-Vis Spectrophotometry data, rhodamine B solution with composite kaolin-TiO2 as catalyst was able to degrade rhodamine B up to 87,7% with the largest percentage of degradation at the 40 minutes.</p> <p>Keyword : ilmenite, kaolin, kaolin-TiO2, degradation, rhodamine B</p> Rezalia Annisa Verry Andre Fabiani Nurhadini Nurhadini ##submission.copyrightStatement## 2021-04-30 2021-04-30 3 1 9 15 10.33019/jstk.v3i1.2075 Uji Aktivitas Antiinflamasi Ekstrak Etanol Daun Belimbing Wuluh (Averrhoa bilimbi L.) Terhadap Penghambatan Denaturasi Protein <p><sub><br>Inflammation is a cell breakdown caused by bacteria, chemical substances, mechanical trauma and physical trauma. Testing of such anti-inflammatory activity can be done in-vitro with the method of protein denaturation using natural materials starfruit leaf (Averrhoa Oxalidaceae L.). This research aims to determine the comparison of the activity of ethanol extract in the strafruit leaf and sodium diclofenac. strafruit Leaf Ethanol extract is made with a concentration of 1 ppm, 10 ppm and 100 ppm with the comparator of sodium diclofenac. Antiinflammatory resistance is obtained by calculating the percentage of inhibition of protein denaturation. The result of a test of strafruit leaf ethanol extract (Averrhoa Oxalidaceae L.) with a value of IC50 of 20.20 μg/mL indicates an inhibitory percentage of more than 20% at the lowest concentration of 1 ppm, while IC50 sodium diclofenac of 14.93 μg/mL with an inhibitory percentage of more than 20% at 5 ppm .</sub></p> <p>&nbsp;</p> Dheani Sepalia Novika Riska Ahsanunnisa Dwi Fitri Yani ##submission.copyrightStatement## 2021-04-30 2021-04-30 3 1 16 22 10.33019/jstk.v3i1.2117 Efficiency of Zinc (II) Metal Ion Adsorption Using Fe3O4/Clay Composites from Bangka <p>Research on the adsorption efficiency of Zn2+ metal ions has been carried out using a composite Fe<sub>3</sub>O<sub>4</sub>-clay from Bangka. This study aims to determine the characteristics of Fe<sub>3</sub>O<sub>4</sub>-clay composites using FTIR and XRD, determine the adsorption efficiency of Zn<sup>2+</sup> metal ions by activated natural clay, Fe<sub>3</sub>O<sub>4</sub>, and Fe<sub>3</sub>O<sub>4</sub>-clay composites (1:1, 1:2 and 1:3) and determine the effect of concentration. on the adsorption efficiency of Zn<sup>2+</sup> metal ions by the Fe<sub>3</sub>O<sub>4</sub>-clay composite. The results of FTIR and XRD analysis showed that the Fe<sub>3</sub>O<sub>4</sub>-clay composite was successfully synthesized. Based on the results of characterization by FTIR on Fe<sub>3</sub>O<sub>4</sub>-clay, it shows the formation of composites with the absorption peak at wave numbers 3685 cm<sup>-1</sup> and 683,89 cm<sup>-1</sup> which were absorption peaks of clay and at wave number 3448,32 cm<sup>-1</sup> is the absorption peak. This absorption peak allowed to bind with clay. In addition, the XRD analysis results of Fe<sub>3</sub>O<sub>4</sub>-clay composite showed a diffraction peak at 2θ = 12,23<sup>o</sup>; 20,83<sup>o</sup>; 24,83<sup>o</sup>; 26,6<sup>o</sup>; 30,48<sup>o</sup>; 35,625<sup>o</sup> and 62,5<sup>o</sup> which consist of clay and Fe<sub>3</sub>O<sub>4</sub>. The adsorption efficiency of activated natural clay, Fe<sub>3</sub>O<sub>4</sub>, Fe<sub>3</sub>O<sub>4</sub>-clay (1:1, 1:2 and 1:3) could absorb Zn<sup>2+</sup> metal ions, respectively 99,18%, 44,76%, 99,25%, 94,63% and 76,25%, with the highest adsorption efficiency found in the Fe<sub>3</sub>O<sub>4</sub>-clay composite (1:1). The adsorption efficiency of Zn<sup>2+</sup> metal ions by the Fe<sub>3</sub>O<sub>4</sub>-clay (1:1) composite reached 49,57% at a Zn<sup>2+</sup> metal ion concentration of 20 mg/L.</p> <p>&nbsp;</p> <p><strong><em>Keywords</em></strong><em>: adsorption, efficiency, composite, Fe<sub>3</sub>O<sub>4</sub>-</em><em>clay</em><em>, Zn<sup>2</sup><sup>+</sup></em></p> Ayu Ratna Sari Verry Andre Fabiani Nurhadini Nurhadini ##submission.copyrightStatement## 2021-04-30 2021-04-30 3 1 23 29 10.33019/jstk.v3i1.2230 Concentration Optimization Na2CO3 Alginates From Turbinaria sp. As Raw Material Electrolite Polymer For DSSC <h4>Polymer electrolyte DSSC is one component of the application can convert solar energy into electrical energy. The polymer electrolyte can be synthesized from brown seaweed Turbinaria sp. However, the optimization of alginate extraction has not been widely carried out, so the aim of this study was to determine the optimum conditions for variations in the concentration of Na2CO3 (3%, 5%, 7%) in extracts from Turbinaria sp as raw material for polymer electrolyte synthesis for DSSC. Alginate optimum extraction results known by percentage yield, moisture content and functional groups using FTIR analysis. The optimum conditions for alginate extraction from Turbinaria sp are Na2CO3 5% and a temperature of 60 <sup>o</sup>C with a yield of 23.81% and a moisture content of 8.1%. FTIR results also indicate the intensity of the strongest mannuronic seen at 822cm<sup>-1</sup> wave numbers.</h4> Dinda Liyana Nurhadini Nurhadini Ristika Oktavia Asriza ##submission.copyrightStatement## 2021-04-30 2021-04-30 3 1 30 33 10.33019/jstk.v3i1.2238