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RISS 인기검색어
- 검색키워드
- 저자 : Akhiruddin Maddu (검색결과 4 건)
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Akhiruddin Maddu,I Deni,Irmansyah Sofian 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.1
TiO2 nanoparticles with varied content of Cu doping have been synthesized by sol-gel method with the addition of polyethyleneglycol (PEG) as a template. The content of Cu doping significantly influenced the structure and morphology of TiO2nanoparticles. Increasing content of Cu doping caused a phase transformation of TiO2 crystal from rutile to anatase. As wellas the surface morphology of TiO2 nanoparticles also significantly were affected by Cu doping, which the TiO2 particlesbecame more finer due to the Cu content increased. The effect of Cu doping on the photocatalytic activity of TiO2 in degradingmethyl violet (MV) dye was investigated. Photocatalysis test results confirmed that the content of Cu doping in the TiO2photocatalyst significantly affected the photocatalytic activity of TiO2 for photodegradation of MV dye. Increasing content ofCu doping increased the degradation rate of MV dye. The TiO2 photocatalyst with the highest Cu doping content (6.0 wt%Cu) has the best photocatalytic activity than the other TiO2 photocatalyst, that is able to degrade MV dye up to 95% after120 minutes of photocatalysis treatment with a degradation rate is 0.0214 ppm per minute. The pH of MV solution alsoinfluenced the photocatalytic activity of TiO2, which the MV dye solution with higher pH has higher the photodegradationefficiency.
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Akhiruddin Maddu 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.2
CaTiO3 has been synthesized utilizing duck’s eggshell waste as calcium source via hydrothermal route followed by heattreatment (sintering). Based on the results of X-ray diffraction analysis was found that the crystalline phase of CaTiO3 highlydependent on the sintering temperature, the higher the sintering temperature resulted in the CaTiO3 phase was increasinglydominant in the sample. Meanwhile, the average crystallite size (ACS) of CaTiO3 increases with the sintering temperature. Theresults of microstructural observation by scanning electron microscope (SEM) shows the morphology of CaTiO3 was highlyinfluenced by the sintering temperature, the higher the sintering temperature the greater the particle size CaTiO3. Themeasurement results of dielectrics properties demonstrate the value of the dielectric constant of CaTiO3 increased significantlywith increasing sintering temperature
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Akhiruddin Maddu,Rumayna Purwati,Mersi Kurniati 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.4
Nanocrystalline TiO2 films have been deposited onto glass slides by spin-coating technique using titanium chloride (TiCl3) withcontent variation of poly-ethylene glycol (PEG) addition as a template. Precursors were prepared from 20 mL TiCl3 solutionwith varied content of PEG addition (0.01 g, 0.1 g, and 1 g). Results of XRD analysis shows a transformation of crystal phaseof TiO2 with respect to PEG content. The film with 0.01 g PEG has a rutile phase, whereas the films with 0.1 g and 1 g PEGhave an anatase phase. The SEM photographs show a highly porous of nanocrystalline TiO2 films. Optical properties of TiO2films depend on the content of PEG. UV-Vis absorbance spectra show that the films have an absorption band within UV regionwith absorption edge shorter than 360 nm corresponding to wide optical bandgap of TiO2. Optical bandgap of TiO2 films weredetermined by using a plot of (hv)2 vs. hv based on absorbance spectra, that give a direct bandgap of 3.4 eV for rutile and3.6 eV for anatase.
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Fadiyah Hasta Puspitasari,Nurdiansyah,Ummu Salamah,Nela Rahmati Sari,Akhiruddin Maddu,Achmad Solikhin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Water pollution has been an alarming concern for researchers due to its hazard to life, human health, andenvironment. Chitosan and lignocellulose materials have been harnessed for the purification of contaminated water. Theobjective of this study was to investigate the potential use of chitosan hydrogel filled with activated carbon nanoparticles(ACNPs) and non-activated carbon nanoparticles (n-ACNPs) for water purification. The results of this study revealed thatboth ACNPs and n-ACNPs were comprised by poly- and single crystals with an average nanofiber diameter of 22.27 nmwhereas n-ACNPs were aggregated with diameter size of above 100 nm and was dominated with amorphous region. Limitedvoids were observed in chitosan/ACNPs hydrogel but n-ACNPs added in chitosan hydrogel were aggregated to form voids. With the addition of ACNPs and n-ACNPs, there was not dramatic change in IR wavenumber. The addition of high ACNPsconcentration increased crystallinity index (CrI) of chitosan hydrogel but high addition of n-ACNPs concentration decreasedCrI’s chitosan hydrogel. After chitosan/ACNPs and chitosan/n-ACNPs hydrogel were submerged with heavy metals, IRspectra were altered, and the internal surfaces of these hydrogels became different. Both chitosan/ACNPs and chitosan/n-ACNPs hydrogel were able to absorb Fe and Zn effectively over heavy metals of Pb and Cu. Chitosan hydrogel was moreeffective to kill Escherichia coli than chitosan/ACNPs and chitosan/n-ACNPs hydrogel.
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