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SYNTHESIS OF POROUS TIO2 WITH STARCH TEMPLATE AND ITS PHOTOACTIVITY TOWARDS PHOTODEGRADATION OF METHYLENE BLUE Purwiandono, Gani; Kartini, Indriana
EKSAKTA: Journal of Sciences and Data Analysis VOLUME 15, ISSUE 1-2, 2015
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/eksakta.vol15.iss1-2.art1

Abstract

Hydrothermal synthesis of TiO2 using starch as pores forming agent has been investigated. The research aimed to investigate the effect of crystallinity and porosity of TiO2 to its photocatalytic activity using photodegradation of methylene blue. TiO2 was synthesized without starch and with various starch concentration (0.5%, 2.5%, 5%, 10% w/v). The starch was dissolved in ethanol,and then was added drop wisely into titanium (IV) tetraisopropoxide(TTIP) solution. The mixture was treated hydrothermally at 100 ºC for 4 h. Starch templatewas removed through calcination at 450 ºC for 4 h. The synthesized TiO2 was characterized by FT-IR spectrophotometry. The effect of starch concentration toTiO2 crystallinity was analyzed using XRD. The porosity of the synthesized TiO2 was determined using N2 gas sorption analyzer. The photocatalytic activity of TiO2 was monitored through the photodegradation of methylene blue. The XRD patterns show that the TiO2 synthesized with various starch concentration consists mainly of anatase crystalline. The particle size of TiO2 synthesized with starch 5% w/v is 11.32 nm with the specific surface area (SBET) of 110.189 m2/g, the total pore volume of 0.2cc/g and the pore diameter of 3.62 nm. The photoactivity test demonstrates that the synthesized TiO2 could degrade methylene blue up to 56.9% under UV irradiation for 30 minutes
KINETICS AND BALANCE ADSORPSI ION KROMIUM (III) IN SOLUTIONS ON SILICA AND COMPOUND MODIFICATION OF SILICA RESULTS SYNTHESIS FROM GREEN RICE DRINKS Sulastri, Siti; Nuryono, Nuryono; Kartini, Indriana; Kunarti, Eko Sri
Jurnal Penelitian Saintek Vol 19, No 2: Oktober 2014
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/jps.v19i2.3501

Abstract

This study will examine the nature of silica and modified silica in the interaction with Cr (III) ion as an adsorbate. Properties that will be studied are kinetics and equilibrium of Cr (III) adsorption in solution. Studies begins with determining the existence of Cr (III) ion in solution at various pH values, the presence of adsorbent at various pH values, and the adsorption of Cr (III) ion in solution by the adsorbent at various pH values. Based on this data set also can determined some values, e.g the maximum adsorption capacity (notated as Qmax), and the equilibrium constant, the RL value that determined the nature of adsorption were favorable or not favorable. Similarly to the Freundlich isotherm. Adsorption kinetic and equilibrium were performed at pH 5. Each adsorbent has a different kinetic model. All of adsorbents has compatibility with Langmuir 2 isotherm model, and on these condition had favorable adsorption of Cr (III) ion. The highest Qmax value is at HSSN. In the Freundlich isotherm model can be stated that all of the adsorbent is favorable for the adsorption process of Cr (III) ion in solution..
HYDROTHERMAL SYNTHESIS OF ROD AND CHRYSANTHEMUM LIKE NANOSTRUCTURED ZNO Putri, Anissa A.; Wahyuningsih, Tutik D.; Kartini, Indriana
Indonesian Journal of Chemistry Vol 11, No 2 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21399

Abstract

Rod and chrysanthemum-like nanostructured ZnO thin film have been prepared hydrothermally in NaOH and NH3 solution utilizing zinc nitrate hexahydrate as the precursor. ZnO thin films were grown on ITO glass substrate with the seed layer of zinc oxide. Perpendicularly aligned arrays of corrugated ZnO nanorods were grown in NaOH solution, while the chrysanthemum like structure was obtained in ammonia solution. X-Ray diffraction patterns confirmed that both morphologies presenting wurtzite crystal of ZnO. The nanorod showed strong (002) orientation of ZnO.
ADSORPTION OF CA(II), PB(II) AND AG(I) ON SULFONATO-SILICA HYBRID PREPARED FROM RICE HULL ASH Sulastri, Siti; Nuryono, Nuryono; Kartini, Indriana; Kunarti, Eko Sri
Indonesian Journal of Chemistry Vol 11, No 3 (2011)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21392

Abstract

In this research, adsorption of Ca(II), Pb(II) and Ag(I) in aqueous solution onto sulfonato-silica hybrid (SSH) prepared from rice hull ash (RHA) has been studied. The preparation of SSH adsorbent was carried out by oxidation of mercapto-silica hybrid (MSH) with hydrogen peroxide (H2O2) solution 33%. MSH was prepared, via sol-gel process, by adding 3 M hydrochloric acid solution to mixture of sodium silicate (Na2SiO3) solution and 3(trimethoxysilyl)-1-propanthiol (MPTS) to reach pH of 7.0. Solution of Na2SiO3 was generated from destruction of RHA with sodium hydroxide solution followed with heating at 500 °C for 30 min. The SSH produced was characterized with Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) analyzer, energy dispersive X-ray (EDX) spectroscopy and determination of ion-exchange capacity for sodium ion (Na+). The adsorption of Ag(I) and Ca(II) were conducted in a batch system in various concentrations for one hour. The adsorbent ion was calculated based on difference of concentrations before and after adsorption process determined using atomic absorbance spectrophotometric (AAS) method. The adsorption character was evaluated using model of isotherm Langmuir and Freundlich adsorption to calculate the capacity, constants and energy of adsorption. Result of characterization by EDX and FTIR showed qualitatively that SSH has been successfully synthesized which were indicated by appearance of characteristic absorbance of functional group namely silanol (Si-OH), siloxane (Si-O-Si), methylene (-CH2-) and disappearance of mercapto group (SH). The XRD data showed amorphous structure of SSH, similar to silica gel (SG) and MSH. The study of adsorption thermodynamics showed that oxidation of MSH into SSH increases the ion-exchange capacity for Na+ from 0.123 to 0.575 mmol/g. The change in functional group from silanol to mercapto and from mercapto to sulfonato increases the adsorption capacity of Ca(II). However, the capacity order of adsorbents for both ions of Pb(II) and Ag(I) in aqueous solution is MSH > SG > SSH.
SYNTHESIS OF MESOPOROUS TITANIA BY POTATO STARCH TEMPLATED SOL-GEL REACTIONS AND ITS CHARACTERIZATION Budi, Canggih Setya; Kartini, Indriana; Rusdiarso, Bambang
Indonesian Journal of Chemistry Vol 10, No 1 (2010)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.21476

Abstract

Mesoporous titania powders with high-order crystalline building blocks had been synthesized through the sol-gel process using potato starch gel template. Internal spongelike pore structure of starch gel template was generated by heating the starch granules at 95 °C in water solution and freezing the starch gel at -15 °C. The synthesis routes were performed by immersing the starch gel template for 4 days into the white colloidal solution of TiO2 nanoparticles, which were prepared by hydrolyzing titanium (IV) tetraisopropoxide (TTIP) in ethanol at pH 1. Mesoporous TiO2 powders were obtained by two different ways of template removal, performed by calcination of the TiO2-starch composites at 600 °C for 4 h or combination of extraction with ethanol-HCl (2:1) at 80 °C and calcination at 500 °C for 4 h. Fourier Transform Infra Red (FT-IR) spectra shows both of template removal methods result in decreasing of characteristic vibrational band of the starch hydrocarbon on the resulted TiO2 powders. The X-Ray Diffraction (XRD) pattern imply that the concentrations of starch gel template influence the anatase crystallite peaks intensity of the synthesized TiO2 powders. TiO2 templated by 20% of starch sponges gel has highest intensity of anatase crystallite. Scherrer calculation inidicated that anatase particle size has nanoscale dimmension up to 12.96 nm. The nano-architecture feature of mesoporous TiO2 scaffolds was also evaluated by the Scanning Electron Microscope (SEM). It is shown that mesoporous TiO2 framework consist of nanocrystalline TiO2 particles as buiding blocks. The N2 adsorption-desorption isotherm curves assign that TiO2 powder resulted from extraction-calcination route has higher mesoporosity than that of only calcinated. The synthesized mesoporous TiO2 powder exhibits high Brunauer-Emmet-Teller (BET) specific surface area up to 65.65 m2/g.
KAJIAN ANALISIS TERMAL KITIN-KITOSAN CANGKANG UDANG MENGGUNAKAN THERMOGRAVIMETRIC ANALYSIS DAN DIFFERENTIAL THERMAL ANALYSIS (TGA-DTA) Purnawan, Candra; Apriliata, Nurul Hidayat; Kartini, Indriana; Sugiharto, Eko
Jurnal Sains dan Terapan Kimia Vol 2, No 2 (2008)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Telah dilakukan kajian analisis termal pada kitin-kitosan cangkang udangmenggunakan thermogravimetric analysis dan differential thermal analysis (TGA-DTA).Kitosan dengan derajat deasetilasi (DD) bervariasi diperoleh dari proses deastilasi kitindengan kondisi percobaan yang berbeda. Kitin dan kitosan dengan variasi DD tersebutdianalisis menggunakan TGA-DTA.Berdasarkan perbedaan termogram TGA-DTA kitin dan kitosan, menunjukkanbahwa kitosan lebih higroskopis daripada kitin dan memiliki gugus asetil yang lebihsedikit. Pada proses deasetilasi, kitin dimungkinkan terjadi degradasi rantai polimer danpembentukan rantai polimer yang lebih panjang secara acak sehingga heterogenitaspolimer kitosan lebih besar daripada kitin.Kata kunci: kitin-kitosan, analisis termal, termogram TGA/DTA
Efek Deasetilasi Kitin Secara Bertahap Terhadap Derajat Deasetilasi Dan Berat Molekul Kitosan Junaidi, Ahmad Budi; Kartini, Indriana; Rusdiarso, Bambang
Jurnal Sains dan Terapan Kimia Vol 2, No 1 (2008)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Telah dilakukan kajian tentang preparasi kitosan yang dibuat dari kitin melalui proses deasetilasi bertahap menggunakan NaOH. Kitin diisolasi dari kulit udang putih Lampung (Litophenaeus vannamei). Derajat deasetilasi ditentukan dengan menggunakan metode spektroskopi FTIR dan berat molekul ditentukan dengan menggunakan metode viskometri. Efek deasetilasi kitin secara bertahap terhadap derajat deasetilasi dan berat molekul dipelajari dengan cara membandingkannya dengan deasetilasi secara kontinyu. Hasil penelitian menunjukkan bahwa deasetilasi kitin secara bertahap dapat meningkatkan derajat deasetilasi kitosan yang diperoleh secara signifikan dan tidak ada perbedaan berat molekul yang signifikan antara kitosan hasil deasetilasi bertahap dengan kitosan hasil deasetilasi kontinyu. Hal ini mengindikasikan bahwa konsentrasi NaOH sangat berpengaruh terhadap proses deasetilasi, tapi tidak signifikan berpengaruh terhadap proses depolimerisasi.Kata kunci : kitin, kitosan, deasetilasi bertahap, derajat deasetilasi, berat molekul.
SENSITIZATION OF XANTHOPHYLLS-CHLOROPHYLLIN MIXTURES ON TITANIA SOLAR CELLS Kartini, Indriana; Dwitasari, L.; Wahyuningsih, T. D.; Chotimah, Chotimah; Wang, L.
International Journal of Science and Engineering Vol 8, No 2 (2015)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (279.743 KB) | DOI: 10.12777/ijse.8.2.109-114

Abstract

Co-sensitization of natural dyes on TiO2 for dye-sensitized solar cell (DSSC) was proposed between chlorophyllin (C) and xanthophylls (X at various volume ratios of C/X. Chlorophyllin is chlorophyll derivative providing -COOH groups essential for binding to TiO2. The chlorophyll was extracted from dried spinach (amaranthus viridis) leaves in a mixture of methanol-acetone (70%:30%). Chlorophyll extract dye was obtained after partition of the crude extracts in diethyl ether solution. Then, it was hydrolyzed under alkaline condition to get chlorophyllin. Xanthophyll was extracted from fresh petal of chrysanthemum (chrysanthemum indicum) flowers. Blending of chlorophyllin and xanthophyll was carried out at various volume ratios of C to X (1:0, 5:1, 1:1, 1:5, 0:1). Titania solar cells were constructed in sandwich system of conducting glass-titania/dyes as the photoanode and conducting glass-platinum as the photocathode. Electrolyte solution containing I-/I3- was inserted between the electrodes by capillary action. All dye extracts and blending solutions were analyzed by UV-Vis spectrophotometer. It is shown that the absorption spectra of blending dyes are complimentary in the visible region resulted in a panchromatic response of the dyes. From the cyclic voltammogram of the dyes and blended-dyes, it is found that the energy level of xanthophyll is the lowest. The I-V test at 100 mw/cm2 irradiation confirmed that the energy conversion efficiency (h) of the blended dyes of xanthophyll and chlorophyllin-sensitized solar cell resulted in significant improvement than those of the single dye. Beneficially, the mixed dyes can be adsorbed from solution blend using single dipping step.
Study of Structural Properties of Mesoporous Carbon From Fructose with Zinc Borosilicate Activator Setianingsih, Tutik; Kartini, Indriana; Arryanto, Yateman
The Journal of Pure and Applied Chemistry Research Vol 3, No 3 (2014)
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (446.981 KB)

Abstract

Structural properties, including pore structure, functional group of carbon surface, and crystal structure of carbon built by zinc borosilicate (ZBS) and ZnCl2 (Z) have been investigated in this work. Physically, ZBS and ZnCl2 may act as template of carbon, whereas the Zn(II) cation act as chemical activator of carbonization. All precursors of ZBS (silicagel, boric acid, and ZnCl2) may act as catalysts of caramelization. The caramelization was conducted hydrothermally at 85oC and thermally 130oC. The carbonization was conducted at 450oC. The resulted carbons were washed by using HF 48% solution, 1M HCl solution, and aquadest respectively. The solid products were characterized by using nitrogen gas adsorption, infrared spectrophotometry, X-ray diffraction, and Transmition Electron Microscopy. Result of research showed that ZBS built larger mesopore volume, larger pore domination of pore size, more hydrophobic carbon, and more amorf than ZnCl2.
PENINGKATAN AKTIVITAS FOTOKATALITIK TiO2 MESOPORI DENGAN SENSITISASI TiO2 MENGGUNAKAN SENYAWA KOMPLEKS BERWARNA Wahyuningsih, Sayekti; Kartini, Indriana; Narsito, Narsito
Alchemy Jurnal Penelitian Kimia Vol 7, No 1 (2008)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

Peningkatan aktivitas fotokatalitik TiO2 mesopori telah dapat dilakukan dengan modifikasi permukaan TiO2 melalui penambahan senyawa kompleks berwarna M2+ (SiPA)n(PAR)m (M2+ = Co2+ dan Fe2+) (SiPA = sililpropilamin). Penambahan senyawa kompleks sensitiser pada permukaan TiO2 dilakukan dengan cara pembentukan senyawa kompleks in situ dengan penambahan berturut-turut ligan primer aminopropiltrimetoksisilan (APTS), Ion logam transisi (Co2+ atau Fe2+) dan ligan sekunder 4-(2-piridilazo)resorsinol (PAR). Dibandingkan dengan TiO2 mesopori sebelum disensitisasi, TiO2 setelah disensitisasi (TiO2/SiPA-Co2+-PAR dan TiO2/SiPA-Fe2+ -PAR) menunjukan peningkatan aktivitas fotokatalitik  ~20% untuk fotodegradasi metilen blue dengan radiasi cahaya visibel.