Found 7 Documents

Pemanfaatan Zat Warna Alam Kayu Jambal (Pelthophorumferugineum) sebagai Sensitizer pada Sel Surya Fotoelektrokimia Khairi, Syahrul
ELKHA: Jurnal Teknik Elektro Vol 8, No 1 (2016): Edisi Bulan Maret 2016
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (358.679 KB) | DOI: 10.26418/elkha.v8i1.18274


Abstract– The Natural dye of Jambal wood (Pelthophorumferugineum) was used as sensitizer in the fabrication of dye sensitizer solar cell (DSSC). The dye was extracted by using solid-liquid extraction method with ethanol as a solvent. UV-Vis spectrophotometer was used to measure the absorbance of dye solution. TiO2 thin-layer was prepared by slip coating method which the pH 5 suspension of TiO2 Degussa on HCl deposited on a glass substrate Fluorine-doped Tin Oxide (FTO).Dye adsorption was done by the immersion TiO2 thin layer in the dye solution in ethanol for 24 hours after calcination, then used as the working electrode. Counter electrode was prepared by the deposition of gold on the glass substrate.The performance of solar cells sensitized of natural Jambal wood dye was investigated through the measurements of Isc (short circuit currents) and Voc (open circuit voltage on) during irradiation with sun simulated Philips Powertone lamp. The measurement results showed that the solar cell has Isc and Voc by 56 ηA/cm2 and 394 mV respectively.   Keywords– Fotoelektrokimia, Dye Sensitized Solar Cell, zatwarnaalam, Jambal.
Selective Hydrogenation of Biomass-derived Furfural over Supported Ni3Sn2 Alloy: Role of Supports Rodiansono, Rodiansono; Astuti, Maria Dewi; Khairi, Syahrul; Shimazu, Shogo
Bulletin of Chemical Reaction Engineering & Catalysis 2016: BCREC Volume 11 Issue 1 Year 2016 (SCOPUS Indexed, April 2016)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (739.187 KB) | DOI: 10.9767/bcrec.11.1.393.1-9


A highly active and selective hydrogenation of biomass-derived furfural into furfuryl alcohol was achieved using supported single phase Ni3Sn2 alloy catalysts. Various supports such as active carbon (AC), g-Al2O3, Al(OH)3, ZnO, TiO2, ZrO2, MgO, Li-TN, and SiO2 have been employed in order to understand the role of the support on the formation of Ni3Sn2 alloy phase and its catalytic performance. Supported Ni3Sn2 alloy catalysts were synthesised via a simple hydrothermal treatment of the mixture of aqueous solution of nickel chloride hexahydrate and ethanol solution of tin(II) chloride dihydrate in presence of ethylene glycol at 423 K for 24 h followed by H2 treatment at 673 K for 1.5 h, then characterised by using ICP-AES, XRD, H2- and N2-adsorption. XRD profiles of samples showed that the Ni3Sn2 alloy phases are readily formed during hydrothermal processes and become clearly observed at 2θ = 43-44o after H2 treatment. The presence of Ni3Sn2 alloy species that dispersed on the supports is believed to play a key role in highly active and selective hydrogenation of biomass-derived furfural towards furfuryl alcohol. Ni3Sn2 on TiO2 and ZnO supports exhibited much lower reaction temperature to achieved >99% yield of furfuryl alcohol product compared with other supports. The effects of loading amount of Ni-Sn, reaction conditions (temperature and time profile) on the activity and selectivity towards the desired product are systematically discussed. Copyright © 2016 BCREC GROUP. All rights reservedReceived: 10th November 2015; Revised: 31st December 2015; Accepted: 5th January 2016How to Cite: Rodiansono, R., Astuti, M.D., Khairi, S., Shimazu, S. (2016). Selective Hydrogenation of Biomass-derived Furfural over Supported Ni3Sn2 Alloy: Role of Supports. Bulletin of Chemical Reaction Engineering & Catalysis, 11 (1): 1-9. (doi:10.9767/bcrec.11.1.393.1-9)Permalink/DOI: Metrics: (click on the button below to see citations in Scopus) 
Preparation and Characterization of Polysulfone/Celullose Acetate (PSF/CA) Blend Membrane Syahbanu, Intan; Piluharto, Bambang; Khairi, Syahrul; Sudarko, S.; Hermanto, Toto
Jurnal ILMU DASAR Vol 20 No 1 (2019)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (176.932 KB) | DOI: 10.19184/jid.v20i1.8684


Blend polysulfone (PSF)/cellulose acetate (CA) membranes have prepared by phase inversion method. In here, CA was prepared from bacterial cellulose by acetylation reaction. Various temperature of coagulation bath were used as variable to investigated water uptake, water flux, porosity and thermal properties of membranes. As comparison, the CA commercial (CCA) was also investigated with the same parameters. As the result, the functional group analysis by FTIR show that CA has successfully prepared from bacterial cellulose. The parameters include water uptake, water flux and porosity have the similar trend. The parameters increase with increasing of temperature of coagulation bath. The other hand, CCA membrane have similar trend to CA membranes for parameter of water water uptake, water flux and porosity. However, CCA membrane is higher than CA membranes for all parameters. Thermal analysis by Differential Scanning (DSC) showed that all blend membranes with different temperature of coagulation bath have single transition glass temperature (Tg) that indicated that molecular homogeneity. Keywords: blend membrane, phase inversion, coagulation bath, water flux, porosity.
Jurnal Teknologi Lingkungan Lahan Basah Vol 7, No 1 (2019): Januari 2019
Publisher : Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (288.029 KB) | DOI: 10.26418/jtllb.v7i1.37374


Abstract The potential of shrimp shells as a source of chitosan for the processing of West Kalimantan peat water has been studied. Chitin as a precursor of chitosan was extracted from the shrimp shells by means of deproteination and demineralization processes. Deproteination was performed by suspending the shrimp shells to 3,5% NaOH at 65oC for 4 hours. The demineralization process was done by using 1.5M HCl at the same temperature and time. Difference concentration of NaOH (30 ? 70%) was applied in deacetylation of chitin to chitosan in order to obtain informations on the effect of base on chitosan deacetylation degree. The results obtained showed that the higher the concentration of NaOH, the higher the chitosan deacetylation degree. The highest deacetylation degree was obtained when chitin was deacetylation using 70% NaOH with the value of 87.5%. Performance of the chitosan was examined in the peat water treatment process. Some test parameters showed that chitosan added to peat water causes coagulation and flocculation with peat water components. This was indicated by the decreasing in color parameter value of 337 PtCo, the decreasing of organic substances in peat water of 10 mg/L and the increasing of pH value to 7.9. Keywords: chitin, chitosan, coagulation, flocculation, peat water Abstrak Potensi cangkang udang putih sebagai sumber kitosan untuk proses pengolahan air gambut Kalimantan Barat telah dipelajari. Kitin sebagai prekursor dari kitosan diekstrak dari kulit udang putih melalui dua tahap yaitu deproteinasi dan demineralisasi. Deproteinasi dilakukan dengan menggunakan NaOH 3,5% pada suhu 65oC selama 4 jam dan dilanjutkan dengan proses demineralisasi menggunakan HCl 1,5M dengan suhu dan waktu yang sama. Variasi konsentrasi basa NaOH sebesar 30 ? 70 % dilakukan pada proses deasetilasi kitin menjadi kitosan guna mendapatkan informasi pengaruh konsentrasi basa terhadap derajat deasetilasi kitosan. Hasil yang diperoleh menunjukkan bahwa semakin tinggi konsentrasi basa NaOH yang digunakan maka semakin tinggi pula derajat deasetilasi kitosan yang diperoleh. Konversi tertinggi diperoleh ketika kitin dideasetilasi menggunakan NaOH 70% dengan nilai derajat deasetilasi sebesar 87,5%. Performa kitosan hasil deasetilasi terbaik diuji pada proses pengolahan air gambut. Beberapa parameter uji menunjukkan bahwa kitosan yang ditambahkan pada air gambut menyebabkan terjadinya koagulasi dan flokulasi dengan komponen air gambut. Hal ini ditandai dengan menurunnya nilai parameter warna sebesar 337 PtCo kandungan zat organik di dalam air gambut sebesar 10 mg/L dan nilai pH yang meningkat menjadi 7,9.  Kata kunci: kitin, kitosan, koagulasi, flokulasi, air gambut
AB INITIO STUDY OF AMMONIA CLUSTERS: (NH3)n (n = 2-6) Kandau, Herudi; Sudrajat, Hanggara; Napitupulu, Andreas; Khairi, Syahrul; Al-Fatony, Zaky; Siagian, Herman
Indonesian Journal of Chemistry Vol 8, No 3 (2008)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1593.161 KB) | DOI: 10.22146/ijc.21595


Hydrogen bonded neutral clusters of ammonia, (NH3)n (n = 2-6), have been theoretically investigated employing the D95++(d,p) (and wherever necessary, higher) basis sets at the Hartree-Fock (HF) level as well as with second-order Møller-Plesset (MP2) perturbation theory. While the ammonia trimer and tetramer exhibit perfect molecular symmetries and are nonpolar, the pentamer and hexamer both optimize with slight deviations from perfect symmetries and are seen to posses marginal, but nonzero dipole moments. The (NH3)n linear clusters are seen to be chemically softer than the corresponding cyclic ones.   Keywords: ab initio calculation, ammonia clusters, Hartree-Fock, Møller-Plesset
EFFECT OF PALM EMPTY BUNCH ASH ON TRANSESTERIFICATION OF PALM OIL INTO BIODIESEL Sibarani, Johan; Khairi, Syahrul; Yoeswono, Yoeswono; Wijaya, Karna; Tahir, Iqmal
Indonesian Journal of Chemistry Vol 7, No 3 (2007)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (174.977 KB) | DOI: 10.22146/ijc.21675


Biodiesel conversion from transesterification reaction palm oil with methanol was studied by using an ash of palm empty bunch as a base catalyst. Atomic absorption spectroscopy (AAS) and indicator titration analysis were used as tools for characterization of ash sample. Chemical structure of biodiesel was analyzed by GC-MS. The effects of ash sample weight (5, 10, 15, 20 and 25 g) immersed in 75 mL methanol and the methanol-palm oil mol ratio (3:1; 6:1; 9:1 and 12:1) toward the conversion of biodiesel were investigated. Biodiesel was prepared by refluxing palm oil and methanol containing ash sample. The reflux was done at room temperature for 2 h. Ester layer was distillated at 74 oC, extracted with aquadest and then dried using Na2SO4 anhydrous. The product was characterized by GC-MS, ASTM D 1298 (specific gravity 60/60 °F), ASTM D 97 (pour point), ASTM D 2500 (cloud point), ASTM D 93 (flash point), ASTM D 445 (kinematics viscosity 40 °C) and ASTM D 482 (ash content). The result of GC-MS analysis showed that methyl palmitate is primary content of biodiesel product. A 15 g weight of ash sample gave the maximum biodiesel conversion. By increasing methanol mole quantity, biodiesel conversion increased progressively and maximum at 9:1 methanol-palm oil ratio (84.12 %) and decreased on 12:1 ratio (75.58 %). Most of the biodiesel products were similar to those of the diesel physical characters.   Keywords: Biodiesel conversion, transesterification, palm oil, palm empty bunch
STATUS MUTU AIR PADA LAHAN GAMBUT DI SUNGAI PUTAT KOTA PONTIANAK KALIMANTAN BARAT Fitria, Laili; Desmaiani, Herda; Marcelina, Marcelina; Syafrianto, Muhammad Khalid; Khairi, Syahrul
Rekayasa Vol 13, No 1: April 2020
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (458.452 KB) | DOI: 10.21107/rekayasa.v13i1.5920


Keberadaan sungai sebagai air permukaan sangat diperlukan bagi kelangsungan kehidupan manusia, antara lain sebagai air baku minum, air baku irigasi pertanian, peternakan, pembangkit listrik, rekreasi, dan sebagainya. Diketahui juga bahwa PDAM Tirta Khatulistiwa Kota Pontianak belum melayani seluruh penduduk Kota Pontianak. Sehingga masih ada masyarakat yang memenuhi keperluan air bersih menggunakan air sungai/parit yang ada di Kota Pontianak. Di Sungai Putat yang termasuk kawasan gambut, masyarakat masih menggunakan air sungai tersebut sebagai sumber air bersih. Kualitas perairan sungai merupakan suatu cara yang dapat menduga dan mengevaluasi adanya perubahan lingkungan. Tujuan penelitian ini adalah mengetahui status mutu air pada lahan gambut, tepatnya di Sungai Putat. Standar status mutu air yang digunakan adalah air kelas II berdasarkan PP 82 tahun 2001. Pengambilan sample air menggunakan purposive sampling di 3 titik pada Sungai Putat. Analisis status mutu menggunakan metode STORET. Diketahui bahwa status mutu Sungai Putat Kota Pontianak tercemar sedang. Sehingga dibutuhkan pengendalian pencemaran air terhadap Sungai Putat.