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All Journal Alotrop Jurnal Pendidikan dan Ilmu Kimia
I Nyoman Candra
Program Studi Pendidikan Kimia Jurusan PMIPA FKIP Universitas Bengkulu
Chemistry Education

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KARAKTERISASI ISOTERM ADSORPSI DARI ION LOGAM BESI (Fe) PADA TANAH DI KOTA BENGKULU Hesti Apriyanti; I Nyoman Candra; Elvinawati Elvinawati
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4588

Abstract

[CHARACTERIZATION OF THE  ADSORPTION FROM IRON METAL IONS ISOTHERM ON THE SOIL IN BENGKULU CITY] Level of micronutrient elements Fe takes part in determining the fertility rate of agricultural land. Continuous oxidation of Fe the soil will cause soil poisoning, due to the soil saturated in absorb of Fe. This research aims to determine the characteristics of the soil, adsorption and its ability in absorption isotherm on  Fe metal. Soil samples were taken from the farm in the city of Bengkulu. The characteristics of the soil tested, i.e., water content, pH, and soil type. Adsorption isotherm type is a determination as Langmuir or  Freundlich isotherm. Soil sample after it is dried and cleaned and then milled and sieved at 100 mesh sieve. Moisture content is measured by dried in an oven for 24 hours and the measurement of the difference between the initial and the final weight of the soil. Determination of soil pH is measured by the pH meter on the CaCl2, and soil type is determined by calculating the percentage of sand, silt, and clay from the soil. Maximum adsorption capacity is determined from Fe adsorption isotherm after getting the pH, the weight of adsorbent and optimum contact time. Adsorption Isotherm was determined by adsorption of aqueous Fe variation at the concentration of  2.5; 5; 10; 15; 20; and 25 ppm on optimum pH and weight, and stirred at an optimum contact time, then filtered and measured its absorbance with UV-Vis spectrophotometer. Results of research results in the form of moisture content average 23.5%, soil pH value at 5 and soil type, i.e., dusty clay with the dominant form of Isotherm adsorption is a Freundlich isotherm, and the capacity of soil in adsorbing of iron on this research obtained is amounting to 45.6.
SINTESIS DAN KARAKTERISASI XEROGEL HASIL KOPRESIPITASI DARI PASIR PANTAI PANJANG BENGKULU Finni Meyori; Rina Elvia; I Nyoman Candra
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4646

Abstract

[SYNTHESIS AND CHARACTERIZATION OF XEROGEL RESULTS OF COPRECIPITATION OF LONG BEACH BENGKULU BEACH].  This research aims to synthesize and characterization to  Xerogel which synthesizes from Pantai Panjang  sands Bengkulu. The method used for this study to synthesizes Xerogel is to use the coprecipitation method. Qualitative XRF test against raw sand  materials that were used show that the content of the element is the most significant element of Si. The first  stages of the synthesis of Xerogel is a purification of the sand sample..  Xerogel synthesis is carried out in two phases, namely the manufacture of aqueous solutions of Sodium Silicate and continued with the formation of a gel. The production of Sodium Silicate solution is done using the NaOH concentration at 5, 6 and 7 M.  Gel formation process is done by adding a solution of HCl 10 M into the solution of Sodium Silicate, followed by process of filtration, washing and drying in the oven. The results showed that the optimum conditions of synthesis of Xerogel   obtained  using 6 M NaOH  , with a yield obtained is amounting at 0.8%. The results of the test by XRD shows that the silica crystal structure  on Xerogel  are amorphous-shaped. SEM-EDS test results show that the acquired  Xerogel on research has a smooth texture and size is not homogeneous with the highest content of elements are the elements Si and O.  PSA test shows that particle size in Xerogel an average at 191.4 nm. 
ANALISIS KAPASITAS ADSORPSI SILIKA DARI PASIR PANTAI PANJANG BENGKULU TERHADAP PEWARNA RHODAMINE B Fitri Esa Madina; Rina Elvia; I Nyoman Candra
ALOTROP Vol 1, No 2 (2017)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v1i2.3510

Abstract

[ANALYSIS OF SILICA ADSORPTION CAPACITY FROM THE SAND OF PANTAI PANJANG BENGKULU  AGAINST RHODAMINE B DYES ] This research was aimed to study the adsorption capacity of synthetic silica on Rhodamine B dyes. Synthetic silica was obtained from the sand of Pantai Panjang  Bengkulu by alkali fusion method using KOH at  360 °C for 4 hours in furnace to obtain potassium silicate crystals (K2SiO3). The crystals were then added 500 mL aqua DM, stirred and sterilized for 24 hours folloed by filtered. The filtrate was dropped with 10 M HCl solution until the pH of filtrate solution reached at 1 to 2 and formed a silent white gel for 24 hours. Moreover,  the gel was filtered with filter paper and washed with aqua DM until pH is neutral and free from KCl, and dried in an oven at 60 °C for 18 hours. The obtained silica powder is then smoothed with mortar and weighed. The adsorbent of Rhodamine B dyes using the synthetic silica powder was performed on pH  variation at 2, 3, 4, 5, 6, and 7 , and  variation of contact time at 10, 20, 30, 40, 50, and 60 min. The results showed that the optimum  condition of adsorption of Rhodamine B by silica from Pantai Panjang sand occured at optimum pH   2 and optimum contact time  20 minutes; with adsorption capacity of 4.95 mg / g and 4.79 mg/g; and with adsorption efficiency of 99.00% and 95.89%.
POTENSI AKTIVITAS ANTIOKSIDAN METABOLIT SEKUNDER DARI BAKTERI ENDOFIT PADA DAUN Moringa oleifera L Susi Juni Yati; Sumpono Sumpono; I Nyoman Candra
ALOTROP Vol 2, No 1 (2018)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v2i1.4744

Abstract

[POTENTIAL ANTIOXIDANT ACTIVITY OF SECONDARY METABOLITES FROM ENDOPHYTE BACTERIA ON Moringa oleifera L LEAF] This research aims to know the similarities between secondary compound metabolites produced by endophyte bacterial on host leaves and from  Moringa oleifera L (kelor) leaves as well as determine the magnitude of antioxidant activity compounds of secondary metabolites produced by bacterial endophyte. Based on the results of the test compound is secondary metabolite in both samples, for secondary metabolite compounds in the extract of the leaves of M. oleifera L. contains identified steroid compounds, flavonoids, saponins, tannins and phenolic compounds, while for metabolites secondary bacterial endophyte undetectable on the existence of any secondary metabolite compounds.For testing of antioxidants on endophyte bacterial extracts of leaves of M. oleifera L is done using the DPPH method, performed on variations of the concentration of 200, 400, 600, 800, and 1000 ppm with Ascorbic acid as a comparison. The results of the test get an IC50 of M. oleifera L leaf extract at 243.67 ppm, and supernatan extract from endophyte bacterial at 492 ppm. The IC50 values showed antioxidant activity in secondary metabolite compounds derived from extracts of the leaves of M. oleifera L which has an extreme antioxidant category. The amount of antioxidant activity for secondary metabolite compound extracts of bacterial endophyte on leaves of M. oleifera L category is feeble, and to extract the supernatan activity is weak compared to the value of the antioxidant activity of Ascorbic acid.
ANALISIS KEMAMPUAN TANAH DI DAERAH PEMUKIMAN KOTA BENGKULU DALAM MENJERAP ALKYL BENZENE SULPHONATE (ABS) DAN LINEAR ALKYLBENZENE SULPHONATE (LAS) Fikri Ananda; I Nyoman Candra; Elvinawati Elvinawati
ALOTROP Vol 3, No 1 (2019)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v3i1.9027

Abstract

This research aims to know the ability of land in a residential area of the city of Bengkulu in adsorbed Alkyl Benzene Sulphonate  (ABS) and Linear Alkyl Benzene Sulphonate (LAS). Soil samples were taken at five-point i.e. the backyard of Balai Buntar,   Fatmawati  Airport, Beringin Raya , Pematang Gubernur and Simpang Nakau  with a drill ground at a depth of 20 cm and cleaned from garbage impurity. Then the soil characterized include moisture content, pH, texture and the organic content  and ABS and ALS adsorbsition measured using UV-vis spectrophotometers att 222-223 nm wavelengths. In this research tested the influence of pH, pulp and optimum contact time contacts from soil sample at in ABS and ALS adsorbsition The adsorbtion pattern is known as the Freundlich and Langmuir parameters. Based on research, generally, it can be concluded that the land in the residential area of Bengkulu city has characteristic average water content – average 23%, pH average – average 5.35 and it's Turn dusty clay. The optimum condition from soil in adsorbs from Alkyl Benzene Sulphonate (ABS) occurs at pH 3, a mass of 1 g and 2 hours of contact time with the adsorption capacity of 0.874 mg/g, while for Linear Alkyl Benzene Sulphonate (LAS)  adsorption  the optimum soil conditions occur at pH 2, mass 0.5 g and 1-hour contact time with the adsorption capacity of 1.607 mg/g.  The pattern of soil adsorption against ABS tends to follow the Langmuir equation whereas against LAS tend to follow the Freundlich equation. Adsorpstion of soil samples in Bengkulu City against ABS belongs to low and adsorpstion against LAS belongs to very low
ANALISIS KEMAMPUAN TANAH DI DAERAH DANAU DENDAM KOTA BENGKULU DALAM MENJERAP LOGAM KROMIUM Tiara Laudia; I Nyoman Candra; Elvinawati Elvinawati
ALOTROP Vol 4, No 2 (2020)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/atp.v4i2.16698

Abstract

EKSTRAKSI METABOLIT SEKUNDER DAN UJI ANTIOKSIDAN DARI DAUN MEDANG PERAWAS (Litsera Odorifera val) DENGAN METODE 1,1-DIPHENYL 2-PICRYLHIDRAZYL (DPPH) I Nyoman Candra; Theo Kuntara; Agus Sundaryono
ALOTROP Vol 6, No 1 (2022)
Publisher : University of Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/alo.v6i1.22398

Abstract

Litseaodoriferaval.(MedangPerawas) is well recognized in Muko-Mukoregency, Bengkulu Province and used as construction material. In Serawai and Lembak Ethnic groups, it is traditionally used as medication for mouth sprue, stomachache,and boil as well as used for inducing lactation. This research aims to extract secondary metabolite compound group contained in Litseraodorifera val. leaf and to examine its antioxidant activity potency against 1,1-diphenyl 2-picrylhidrazyl (DPPH). A Fresh leaves from Litseraodorifera val. collected from Tahura Forest, Central Bengkulu area were separated into two parts: one run into chemical screeningand the second was used for extraction experiment using ethanol, ethyl acetate, hexane and acetone. Secondary metabolite compound groups contained in those extracts were tested for antioxidantactivity potency. The results showed that the extract of Litseraodorifera val. leaf contained compound group of flavonoid, saponin, tannin, phenolicand terpenoid. The extract of Litseraodorifera val. Leafincrude extract, ethyl acetate, acetone, ethanol and hexane can reduce free radical of  DPPH with IC50 of 250.7; 66.7; 69.7; 100.3 and 181.9 ppm respectively. Those are higher compared to vitamin C whose IC50 was 28.3 ppm. The extract of Litseraodorifera val. leaf haspotency as antioxidant activity that can be developed through further research.
Co-Authors Budiyanto Budiyanto Elvinawati Elvinawati Elvinawati Elvinawati Fikri Ananda Finni Meyori Fitri Esa Madina Hesti Apriyanti Rina Elvia Sumpono Sumpono Susi Juni Yati Theo Kuntara Tiara Laudia