Hary Sanjaya
Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Padang, Jl. Prof. Dr.Hamka, Padang

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Penentuan Kondisi Optimum Proses Degradasi Methanil Yellow Pada Reaktor Fotokatalitik TiO2/SiO2 Irwan, Irene Praticia; Hamzah, Hardeli; Sanjaya, Hary
Periodic Vol 1, No 1 (2012)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (325.104 KB) | DOI: 10.24036/p.v1i1.555

Abstract

Photocatalytic reactor is a device used to degrade organic pollutants. In this study, researchers used TiO2/SiO2 photocatalytic reactor to degrade dye yellow methanil 20 ppm. This study aims to determine the number of columns used glasses and long irradiation optimum TiO2/SiO2 photocatalytic reactor to degrade methanil yellow dye. In this study, the used TiO2 Degussa P-25 with the addition of SiO2 which aims to reduce pore size and extend catalyst surface thereby optimizing the photocatalytic activity of TiO2 films. Variations in the amount of glass columns used were 3, 5, 7, 9, and 11 columns. While the variation of irradiation time is longer irradiation are 1, 2, 3, 4, 5, 6, hours. After the process of degradation, absorbance was measured using a spectrophotometer methanil yellow UV-Vis and degradation products formed at the optimum conditions were identified using GC-MS. Characterization of TiO2/SiO2 crystals using XRD. The result showed the optimum conditions methanil yellow degradation at a concentration of 20 ppm in the photocatalytic reactor that is, the number of columns as much as 9 cups of fruit and a long column of irradiation for 4 hours. In this condition, the percentage obtained by degradation of 12.63% with a flow rate of 95 ml / s and as much as 5x the amount of coating coating.
Determination of Maximum Adsorption Capacity of the Napa Soil on Chromium Ions (III) Ningsih, Syukrya; Mawardi, Mawardi; Sanjaya, Hary
Periodic Vol 2, No 2 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (257.429 KB) | DOI: 10.24036/p.v2i2.3002

Abstract

Determination of maximum adsorption capacity of the Napa Soil on chromium ions (III) has been investigated, the aims of the research for to know the characteristics and maximum adsorption capacity of Napa soil on chromium (III). Experimentally, all steps were performed in series of experiment using a continuous techniques with respect to the influence of pH, initial chromium concentration, particle size, temperature heating adsorbent, solution flow rate, and determined the maximum adsorption capacity and adsorption affinity adsorbent was determined by the Langmuir Isotherm Equation and metal analysis carried out by Atomic Adsorption Spectrophotometer instrument. The results of this study showed that optimum condition at pH 5, initial chromium concentration is 250 mg/L, particle size is 850 mm, temperature heating adsorbent on 125°C, solution flow rate is 20 drops/min. Showed has the maximum adsorption capacity of the Napa Soil on chromium ions (III) is 3,28 mg/g.
Penyerapan Logam Krom dalam Limbah Cair Laboratorium Kimia Menggunakan Adsorben Tanah Napa Anwar, Mawardi; Sanjaya, Hary; Frisiananda, Victoria
Periodic Vol 2, No 1 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.044 KB) | DOI: 10.24036/p.v2i1.1929

Abstract

It has been investigated the adsorbtion of chrom metal in chemistry laboratory liquid waste using tanah napa as an adsorbent. Waste containing chrom metal was pass through a coloum that filled with tanah napa adsorbent. It is studied the use of nitrit acid (HNO3) for regeneration purpose and recovery of chrom metal at various concentration. The result showed that HNO3 at concentration 0.4M was the best for regeneration of Chrom(III) is 78.03% and concentration 0.3M for regeneration of Chrom(VI) is 53.02%. The optimum condition of this method were applied to preconcentration of Chrom in chemistry laboratory liquid waste with HNO3 0.3M. The result show that Chrom found in chemistry laboratory liquid waste which is initially 0.9123 ppm can be preconcentration to 1.7760 ppm with 5x10mL preconcentration.
MAKING DYE SENSITIZED SOLAR CELL (DSSC) USING GMR AS SUBSTRACT AND PURPLE SWEET POTATO EXSTRACT (Ipomoea batatas L) AS A D DYE SENSITIZER Oktavia, Utami; Sanjaya, Hary
Periodic Vol 8, No 1 (2019): PERIODIC
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1421.844 KB) | DOI: 10.24036/p.v8i1.105061

Abstract

Dye Sensitized Solar Cell (DSSC) is a third generation photovoltaic cell that configures visible light into electrical energy. This  study aims  to make DSSC using GMR as  substrate with spin coating gel solvents and natural dyes from purple sweet potato (Ipomoea batatas L). From  testing the purple sweet potato is known to contain anthocyanin compounds in testing using FTIR and has a maximum wavelength of 525 nm in testing Uv-Vis. From the results of the calculation of efficiency with  immersion obtained at a concentration of 50% the efficiency is 0.19%, while the variation in immersion time is 5 hours of efficiency 0.72%.
Penentuan Kondisi Optimum Jumlah Pelapisan dan Lama Penyinaran Proses Degradasi Zat Warna Methylene Blue Pada Reaktor Fotokatalitik TiO2 dengan Penambahan SiO2 Andriko, Nopri; Hamzah, Hardeli; Sanjaya, Hary
Periodic Vol 1, No 1 (2012)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (312.87 KB) | DOI: 10.24036/p.v1i1.561

Abstract

Penelitian ini bertujuan menentukan lama penyinaran dan pelapisan optimum reaktor fotokatalitik TiO2/ SiO2 untuk mendegradasi zat warna Methylene Blue. Penelitian ini menggunakan rancangan acak lengkap dengan 2 faktor. Faktor pertama adalah jumlah pelapisan dan faktor kedua adalah lama penyinaran. Pada penelitian ini, digunakan TiO2 Degussa P-25 dengan penambahan SiO2 yang berguna untuk mencegah terjadinya rekombinan antara e- dan h+. Methylene Blue yang terdegradasi diukur menggunakan spektrofotometer UV-Vis dan produk degradasi yang terbentuk pada kondisi optimum diidentifikasi menggunakan GC-MS. Hasil penelitian menunjukkan bahwa kondisi optimum untuk mendegradasi Methylene Blue 5 ppm dicapai pada pelapisan 5 kali dan lama penyinaran 5 jam. Pada kondisi ini diperoleh persentase degradasi sebesar 87.61%. Identifikasi dengan GC-MS menunjukkan banyak puncak yang saling tumpang tindih yang menandakan Methylene Blue telah mengalami degradasi. Hasil karakterisasi dengan XRD menunjukkan bahwa Kristal TiO2/ SiO2 merupakan campuran anatase dan rutile, dan dari perhitungan didapatkan ukuran kristalnya sebesar 19,099444 nm.
Pengaruh Equilibrium Kandungan Air Batubara Halus Terhadap Nilai Kalor Bakar Batubara Halus (Fine Coal) Anwar, Mawardi; Sanjaya, Hary; Trisna, Meyci
Periodic Vol 2, No 1 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (555.57 KB) | DOI: 10.24036/p.v2i1.1928

Abstract

The increasing of requirement of domestic cement for a number of years will affect directly to usage of coal as especial fuel for cement production. So that Important to know the usage condition of coal yielding coal with superordinate calorivic value, with better economic value, and smaller negative impact to environment, where with slimmer usage amount of coal better yield coal with higher calorivic value because more and more amount of used coal also will improve the waste that able to influence environment. Have been researched water equilibrium of fine coal with aim to lessen the amount of fine coal usage for cement production process, because from data result of research got calorivic value which mounting of fine coal after done equilibrium of water content in fine coal. Fine coal sample before and after obstetrical equilibrium of its water is determined change of that calorivic value (Cal/g) use Bomb Calorimeter PARR 1261, content of water (%) use Moisture Analyzer, content of sulphur (%), and its dusty content. Result of which is got that after water equilibrium happened minimizing the mass of fine coal’s sample, after done the determination of water content happened minimizing of water content that is equal to 3.14% or happened minimizing that equal to 17% from water content before equilibrium. While for the calorivic value increase until 189 Cal/g or happened increase equal to 3% from calorivic value of sample before equilibrium, for sulphur and dusty content happened increase successively equal to 7% and 5% from content of sample before equilibrium.
DEGRADASI METHYL VIOLET SECARA FOTOLISIS DAN SONOLISIS DENGAN KATALIS TiO2/SiO2 Harnum, Belina; Hardeli, Hardeli; Sanjaya, Hary
Periodic Vol 2, No 2 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (293.999 KB) | DOI: 10.24036/p.v2i2.3025

Abstract

Degradation of methyl violet dye had been done by photolysis and sonolysis with adding TiO2/SiO2 catalyst. This study aims to determine the optimum time for degradation and optimum dopan silica (SiO2). Photolysis method were performed using an irradiation of UV light l= 254 nm and sonolysis  using an ultrasound with frequency 45 kHz. Result methyl violet degradation products obtained under optimum conditions identified by GC-MS. The optimum time for degradation of methyl violet photolysis is 270 minutes, the addition of silica optimum dopan occurs on addition of  25% SiO2, with percentage of degradation (%D)  is  96.52%.  The optimum  time in the degradation of methyl violet  in sonolysis photolysis is 270 minutes and the addition of silica optimum dopan occurs on addition of  25% SiO2, with percentage of degradation (% D)  is  76.19%. Identification of the GC-MS results obtained showed many peaks that have occurred in the degradation of methyl violet molecules.
MAKING DYE SENSITIZED SOLAR CELL (DSSC) USING GMR AS SUBSTRACT AND MANGOSTEEN SKIN EXTRACT (Garcinia Mangostana L) AS A DYE SENSITIZER Ummah, Dina Wirdatul; Sanjaya, Hary
Periodic Vol 8, No 1 (2019): PERIODIC
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/p.v8i1.105059

Abstract

The aim of this is to determine the efficiency of DSSC by using GMR as a substrat with mangosteen skin s a dyes. Mangosteen skin contains of anthocyanin pigmentd. Based on the light absorption test of mangosteen peel extract dyes it is known that the spectrum of mangosteen peel can absorb light at the maximum 510 nm wavelength with absorbance of 2.8873 A. The results of the conversion of sunlight into electrical energy obtained the highest value at 50% concentration of 0.281%. Whereas at 5 hours time variation that is equal to 1.053% because ZnO paste is soaked for 5 hours with coloring and drops of liquid electrolyte.
Pengaruh Ion Logam Cd (II) Terhadap Adsorpsi Ion Logam Pb (II) dengan Adsorben Tanah Napa Anwar, Mawardi; Sanjaya, Hary; Maliki, Azhar
Periodic Vol 2, No 1 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (610.544 KB) | DOI: 10.24036/p.v2i1.1931

Abstract

Research has been done about influence of the presence of metal ions Cd (II) on the adsorption of metal ions Pb (II) by using adsorbents napa land from areas Aripan, South Solok. Napa soil contains 63.20% of silica and alumina 16:55%, it was lmost  same as the content of silica and alumina in  zeolite nature so that it can be used as an adsorbent. In this research studied the influence of  presence of metal ions Cd (II) metal ions on the absorption of Pb (II) with some parameters, such as the initial concentration of the solution, the addition of metal ions Cd (II), pH and temperature of heating the adsorbent. Then also studied the regeneration of both metals by using a solution of 1% HNO3. These results indicate that the presence of metal ions Cd (II) decrease the absorption of the metal ions Pb (II). The optimum concentration of metal ion uptake of Pb (II) was 150 mg / L, the optimum concentration of the addition of metal ions Cd (II) is ½ times of concentration of metal ions Pb (II). The optimum pH for metal ions Pb (II) was 5 and 6 for the metal ions Cd (II). While the optimum  adsorbent heating temperature is 125 ° C, and the percentage of regenerating metal ions Pb (II) was 64 326% and Cd (II) was 38 675%.
OPTIMASI TANAH NAPA SEBAGAI ADSORBEN ION LOGAM Cd (II) Khairat, Atina; Mawardi, Mawardi; Sanjaya, Hary
Periodic Vol 2, No 2 (2013)
Publisher : Jurusan Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.715 KB) | DOI: 10.24036/p.v2i2.3024

Abstract

The effort of handing waste which containing heavy metals examined continuesly, once of effort is adsorption method. In the research, examined about optimum condition determinating of metal ion Cd (II) adsorption by Napa soil adsorption from Solok The Aripan’s area. The napa containts silica 70,979 % and alumina 20,748 %, the amount of silica and alumina in napa almost equals it’s concentration with natural zeolite. The purpose of research is to determine the effect of napa maximum adsorption capacity on metal ions Cd (II), as well as the effect of initial concentration solution, pH solution, particle size of adsorbent, heating temperature adsorbent and flow rate eluent. The research was conducted in two phases, that is the preparation and conduct of the examined. The preparation stage includes the prepare of the tools, materials and samples. The implementation stage begins with a preparation of samples, then used it as the metal ion adsorbents Cd (II). Measurement of the ions Cd (II) concentration conducted with SSA at wavelength 283,3 nm. These results indicate that the optimum initial concentration is 150 mg/L, pH solution is 4, while the particle size is 850 ʮm, temperature of heating the adsorbent is 125 0C, and the flow rate is 20 drops/minute. By using the langmuir adsorption isotherm equation obtained maximum adsorption capacity of the napa metal ions Cd (II) is equal to 0,999 mg/g. The adsorption of metal ions Cd (II) at waste water in Chemical Laboratory Mathematic and saint Faculty UNP has adsorption efficiency 68,72 %.