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All Journal Jurnal Teknoin Jurnal Kimia (Journal of Chemistry) Jurnal Pijar MIPA Jurnal Ilmiah Berkala: Sains dan Terapan Kimia
Karna Wijaya
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara, Yogyakarta 55281, Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Mathematics Mechanical Engineering Physics

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UTILISASI TiO2-ZEOLIT DAN SINAR UV UNTUK FOTODEGRADASI ZAT WARNA CONGO RED Karna Wijaya; Eko Sugiharto; Is Fatimah; Sri Sudiono; Diyan Kurniaysih
Teknoin Vol. 11 No. 3 (2006)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v11i3.88

Abstract

        An investigation of Congo Red photodegradation using TiO2-Zeolite and UV radiation was performed. TiO2-Zeolite was prepared by dispersing of pillaring solution (in form oligocations of titanium) into suspension of Zeolite. The suspension was stirred and then filtered to separate the solid phase from the filtrate. the solid phase was calcined by microwave oven at 800 Watt for 5 minutes to convert the oligocations into its oxide forms. The calcined product and  unmodified Zeolite were characterized using x-ray diffractometry, FT-IR spectrophotometry, X-ray fluorescence and gas sorption analysis to determine their physicochemical properties.        Photocatalytic activity of TiO2-Zeolite was tested on Congo Red using following method: 50 mg of Zeolite was dispersed into 25 mL of 10-4 M Congo Red. The dispersion was irradiated using 365 nm UV light at room temperature on various irradiation times, i.e. 10,20,30,40 and 60 minutes.  At certain irradiation time, the dispersion was filtered and the filtrate was then analyzed its concentration using UV-vis spectrophotometry method.         Characterization results exhibited that the formation of TiO2 on internal as well as external surfaces of Zeolite could not be detected  with x-ray diffractometry and FT-IR spectrophotometry, however determination of titanium using x-ray fluorescence analysis on the calcined product showed that the concentration of titanium was much higher than Zeolite (0.22% on Zeolite and 12.08% on TiO2-Zeolite). Gas sorption analysis result indicated that the the calcination  resulted in the increase of specific surface area (16,31 m2/g on Zeolite and 100,96 m2/g on TiO2-Zeolite) as well as total pore volume  of calcined product (13,34 mL/Å/g on Zeolite and 57,54 mL/Å/g on TiO2-Zeolite). Photocalytic activitiy test result conducted on that dye showed that ca 99 % of Congo Red was degraded by the system TiO2-Zeolite after UV irradiation for 60 minutes.Keywords: TiO2-Zeolite, photocatalytic, UV-irradiation, Congo Red
SINTESIS TIO2/ZEOLIT SEBAGAI FOTOKATALIS PADA PENGOLAHAN LIMBAH CAIR INDUSTRI TAPIOKA SECARA ADSORPSI-FOTODEGRADASI Is Fatimah; Karna Wijaya
Teknoin Vol. 10 No. 4 (2005)
Publisher : Faculty of Industrial Technology Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/.v10i4.102

Abstract

Research on synthesis of TiO2/Zeolite and Its application as photocatalyst in Tapioca Starch Wastewater Treatment has been investigated. Research conducted by synthesis  of TiO2/zeolite by ion exchange process to exchangeable cations in natural zeolite by Ti4+ solution at varied concentration of 0,12 M, 0, 24 M and 0,48 M followed by oxidation and calcination process, followed characterization by analysis of Ti content, XRD measurement, specific surface area measurement and photoactivity toward methylene blue photodegradation.  TiO2/zeolite photoactivity toward photodegradation of tapioca starch wastewater was tested by exposing photocatalyst-wastewater suspension with UV light in varied time and ratio of photocatalyst weight: volume of wastewater.Result of research showed that TiO2/zeolite  has a photoactivity to decrease COD and cyanide content of tapioca starch wastewater. The photoactivity related to specific surface area and photoactivity toward methylene blue photodegradation physical character and also photodegradation time. The highest photoactivity reached by TiO2/zeolite-1 which is resulted by Ti4+concentration of 0,12 M in the ion exchange process to natural zeolite.Keywords :  zeolite, photocatalyst, wastewater quality
PREPARASI DAN KARAKTERISASI KOMPOSIT KROMIUM OKSIDA-MONTMORILLONIT I M. Sutha Negara; Karna Wijaya; Eko Sugiharto
Jurnal Kimia (Journal of Chemistry) Vol. 2, No. 2 Juli 2008
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.878 KB)

Abstract

The objectives of this research were to prepare montmorillonite and of chromium oxide-montmorillonitecomposite by intercalation of oxide of chrom into the silicates interlayer of montmorillonite, and to characterizesome of their physical and chemical properties. The characterization indicated that the basal spacing d001 wasincreased from 14,11 in montmorillonit to 15,55 in chromium oxide-montmorillonite; specific surface area wasincreased from 69,71 m2/g to 240,40 m2/g; total pore volume was also increased from 0,05 mL/g to 0,128 mL/g; andchrom content also increased from 0,007% (w/w) to 17,16 % (w/w).
SINTESIS DAN KARAKTERISASI FOTOKATALIS TiO2 MONTMORILONIT TERPILAR ALUMINA Iwan Sumarlan; Is Fatimah; Karna Wijaya
Jurnal Pijar Mipa Vol. 11 No. 2 (2016): SEPTEMBER
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (481.457 KB) | DOI: 10.29303/jpm.v11i2.108

Abstract

Abstrak. Dispersi TiO2 ke dalam montmorilonit terpilar alumina (PILM) telah sukses dilakukan. Fotokatalis dibuat dengan menginterkalasikan Al13 ke dalam montmorilonit alam kemudian dikalsinasi pada temperatur 500oC. Dispersi TiO2 ke dalam montmorilonit terpilar aluminium (PILM) dilakukan dengan menggunakan metode impregnasi dengan konsentrasi teoritis 0,4; 0,8; 1 dan 3%. Hasil yang diperoleh kemudian dikarakterisasi dengan menggunakan XRD, porosimetry, SEM dan Diffuse Reflectance Spectrophotmetry UV-Visible (DRUV). Hasil karakterisasi fotokatalis Ti/PILM menunjukkan bahwa terjadi penurunan luas permukaan spesifik, volume total pori dan basal spacing setelah dispersi TiO2 pada PILM. Gambar citra SEM menunjukkan bahwa TiO2 masuk ke dalam pori dan juga terdapat pada permukaan fotokatalis. Hasil karakterisasi menggunakan DR UV menunjukkan bahwa band gap fotokatalis Ti/PILM 0,8; 1 dan 3% ialah 3,66; 3,19 dan 3,19 eV. Kata Kunci : Karakterisasi, Montmorilonit, pilarisasi, fotokatalis, TiO2 Abstract. Dispersion of TiO2 on montmorillonite pillared aluminium has been done successfully. The photocatalyst were prepared by intercalation of Al13 onto natural montmorillonite and then calcined at 500oC. Titania dispersion onto aluminium pillared montmorillonite was carried out by impregnation method at the theoritic concentration of 0.4, 0.8, 1 and 3% titania. The photocatalyst then characterized by XRD, porosimetry, SEM and Diffuse Reflectance Visible methods. Results of characterization showed that the basal spacing and specific surface area as well as total pore volume were decreased after dispersion of TiO2 on PILM,  meanwhile SEM image exhibited that beside in the pores of PILM, the TiO2 was also dispersed on the surface of PILM. DR UV characterization result indicated that the band gap of TiO2 dispersed PILM for Ti/PILM 0,8%, Ti/PILM 1% and Ti/PILM 3% was 3.66, 3.19 and 3.19 eV respectively Key word : montmorillonite, pillarization, photocatalyst, TiO2
OPTIMISASI RASIO DIAZINON/ASAM METAKRILAT SECARA TEORITIK BERDASARKAN METODA SEMIEMPIRIK AM1 UNTUK SINTESIS POLIMER TERCETAK MOLEKUL Andrian Saputra; Karna Wijaya; Mohd Noor Ahmad; Iqmal Tahir
Jurnal Sains dan Terapan Kimia Vol 7, No 2 (2013)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (675.161 KB) | DOI: 10.20527/jstk.v7i2.2124

Abstract

Rasio optimum diazinon/asam metakrilat pada desain polimer tercetak molekul untuk aplikasi sensor diazinon berbasis quartz crystal microbalance telah ditentukan secara teoritik menggunakan perhitungan mekanika kuantum semiempirik AM1. Kajian ditentukan berdasarkan pemodelan molekul yang mempelajari interaksi non kovalen antara diazinon sebagai templat dan asam metakrilat sebagai monomer fungsional. Analisis dilakukan untuk mencari kestabilan komplek yang terbentuk dengan berdasarkan parameter energi interaksi antara diazinon dan asam metakrilat yang dilakukan dengan menggunakan perangkat lunak Hyperchem 7.5. Hasil penelitian menunjukkan pembentukan komplek stabil terjadi dengan melibatkan ikatan hidrogen. Untuk kompleks dengan energi interaksi optimum diperoleh dari komplek diazinon/asam metakrilat dengan rasio 1:3, yang kemudian direkomendasikan sebagai rasio mol optimum pada sintesis polimer tercetak diazinon. Kata kunci : diazinon, asam metakrilat, semiempirik AM1, polimer tercetak molekul, Quartz Crystal Microbalance 
ANALYSIS OF HYDROGEN ADSORPTION AND DIFFUSION ON Mg(0001) SURFACE: AN AB INITIO DFT STUDY I Wayan Sutapa; Ria Armunanto; Karna Wijaya
Jurnal Sains dan Terapan Kimia Vol 4, No 1 (2010)
Publisher : Program Studi Kimia, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (220.13 KB) | DOI: 10.20527/jstk.v4i1.2046

Abstract

Ab initio density functional theory (DFT) calculations are performed to study the adsorption of H2 molecules on a Mg(0001) surface. First, the adsorption energy was investigated. In the calculation of the adsorption process of molecular hydrogen, observation showed a physical adsorption of molecular hydrogen rather than chemisorptions.The diffusion process of atomic hydrogen on Mg (0001) was also presented. Finally, we are comparing all of our calculation with results from previous experiments. Keyword: DFT, Adsorption, Diffusion, Mg(0001), H2 
Co-Authors Andrian Saputra Diyan Kurniaysih I Made Sutha Negara I Wayan Sutapa Iqmal Tahir Is Fatimah Iwan Sumarlan Mohd Noor Ahmad Ria Armunanto Saiful Akhyar Lubis Sri Sudiono Yusak Maryunianta