Showing papers by "Karna Wijaya published in 2006"
TL;DR: The salt-dependent binding of racemic iron(II) mixed-ligand complex containing 1,10-phenanthroline (phen) and dipyrido[3,2-a:2',3'-c]phenazine (dppz), [Fe(phen)2( dppz)]2+ to calf thymus DNA (ct-DNA) has been characterized by UV-VIS spectrophotometric titration.
32 citations
DOI•
13 Nov 2006
TL;DR: In this article, an investigation of Congo Red photodegradation using TiO2-Zeolite and UV radiation was performed, where 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.
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/A…/g on Zeolite and 57,54 mL/A…/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
12 citations
01 Jan 2006
TL;DR: In this paper, an investigation of Congo Red photodegradation using TiO2-zeolite and uv radiation was performed, where 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.
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 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/A/g on zeolite and 57,54 mL/A/g on TiO2-zeolite). Photocalytic activity 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
10 citations
01 Jan 2006
TL;DR: In this article, the preparation of titanium oxide-zeolite composite (TiO2-ZEOLITE) has been done, where the solid phase was heated by microwave oven to convert the oligocations into its oxide forms and the resulting material was used to photodegrade the wastewater of PT.
Abstract: The preparation of titanium oxide-zeolite composite (TiO2-zeolite) has been done. Preparation was initiated by dispersing oligocation of titanium solution into suspension of natural zeolite. The suspension was stirred and then filtered to separate the solid phase from the filtrate. The solid phase was heated by microwave oven to convert the oligocations into its oxide forms and the resulting material (called as TiO2-zeolite) then was used to photodegrade the wastewater of PT.Jogjatex The TiO2-zeolite and unmodified zeolite were characterized using X-ray diffractometry, FT-IR spectro-photometry, X-ray fluorescence (XRF) and gas sorption analysis (GSA) methods to determine their physicochemical properties. Photocatalytic activity of TiO2-Zeolite was tested by exposing the suspension of TiO2-Zeolite/wastewater by the UV light of 366 nm at room temperature for 15 – 75 minutes. 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 as well as FT-IR spectrophotometry, however elemental analysis result with XRF indicated that titanium concentration in zeolite increased due to the inclusion, i.e from 0.26% (w/w) in zeolite to 2.80% (w/w) in TiO2-zeolite. Characterization result by GSA exhibited the increased of specific surface area from 19.57 m 2 /g in zeolite to 67.96 m 2 /g in TiO2-zeolite; total pore volume from 20.64 x 10 -3 mL/g in zeolite to 49.561 x 10 -3 mL/g in TiO2-Zeolite; pore radius average decreased from 21.10 A in zeolite to 14.58 A in TiO2-zeolite. Photocatalytic activity test of TiO2-zeolite on wastewater of PT. Jogjatex showed that UV radiation for 75 minutes on the mixture of TiO2-zeolite and wastewater resulted in the decreased of COD number up to 57.85%. Meanwhile the sorption study showed that zeolite and TiO2-zeolite could decrease COD number of wastewater up to 43.95% and 57.85%, respectively.
1 citations
01 Jan 2006
TL;DR: In this article, an investigation of Congo Red photodegradation using TiO2-Zeolite and UV radiation was performed by dispersing of pillaring solution (in form oligocations of titanium) into suspension of Zeolite.
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/A/g on Zeolite and 57,54 mL/A/g on TiO2-Zeolite). Photocalytic activitiy test result conducted on that dye showed that ca 99 % of Congo Red was degraded by the system TiO 2-Zeolite after UV irradiation for 60 minutes.