Browsing by Author "Chang, Sue-Min"

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Acidity of a TiO2-ZrO2 adsorbent modified with phosphate or tungstate species
(2016-08-20)
Chang, Sue-Min
;
Shan, Po-Fan
;
環境工程研究所
;
Institute of Environmental Engineering
Characteristic of an innovative TiO(2)/Fe(0) composite for treatment of azo dye
(2007-12-01)
Huang, Chihpin
;
Hsieh, Wen-Pin
;
Pan, Jill Ruhsing
;
Chang, Sue-Min
;
環境工程研究所
The major problem for Fe(0) application is the degradation of performance as time due to the formation of a surface oxide layer and that for TiO(2), is the limit of the efficiency due to the recombination phenomenon. To overcome the problems as well as to improve the performance, our laboratory has been inventing a novel catalyst, which was developed by coating synthesized sol-gel-derived TiO(2) nanoparticles onto the surface of Fe(0). This composite was employed on the degradation of azo dye (Acid Black-24) in the aqueous solution. Results from XPS, XRD and FE-SEM analysis indicated that the laboratory-prepared nanoscale TiO(2)/Fe(0) material is a composite of TiO(2) and Fe(0). The nanoscale TiO(2)/Fe(0) composite with UV irradiation can efficiently decolour and reduce TOC from the simulated wastewater containing Acid Black-24. The efficiency of the TiO(2)/Fe(0) composite with UV irradiation on AB-24 reduction is much more efficient than microscale, and nanoscale Fe(0) and TiO(2) particle (P-25). The evidence shows that TiO(2) particles by sol-gel process were coated on the Fe(0) particles surface, which is attributed to the longer life cycle of Fe(0) reactivity. (c) 2007 Elsevier B.V. All rights reserved.
Characteristic of an innovative TiO2/Fe-0 composite for treatment of azo dye
(2007-12-01)
Huang, Chihpin
;
Hsieh, Wen-Pin
;
Pan, Jill Ruhsing
;
Chang, Sue-Min
;
環境工程研究所
The major problem for Fe-0 application is the degradation of performance as time due to the formation of a surface oxide layer and that for TiO2, is the limit of the efficiency due to the recombination phenomenon. To overcome the problems as well as to improve the performance, our laboratory has been inventing a novel catalyst, which was developed by coating synthesized sol-gel-derived TiO2 nanoparticles onto the surface of Fe-0. This composite was employed on the degradation of azo dye (Acid Black-24) in the aqueous solution. Results from XPS, XRD and FE-SEM analysis indicated that the laboratory-prepared nanoscale TiO2/Fe-0 material is a composite of TiO2 and Fe-0. The nanoscale TiO2/Fe-0 composite with UV irradiation can efficiently decolour and reduce TOC from the simulated wastewater containing Acid Black-24. The efficiency of the TiO2/Fe-0 composite with UV irradiation on AB-24 reduction is much more efficient than microscale, and nanoscale Fe-0 and TiO2 particle (P-25). The evidence shows that TiO2 particles by sol-gel process were coated on the Fe-0 particles surface, which is attributed to the longer life cycle of Fe-0 reactivity. (c) 2007 Elsevier B.V. All rights reserved.
Chemical Capture of Phosphine by a Sol-Gel-Derived Cu/TiO(2) Adsorbent - Interaction Mechanisms
(2011-02-10)
Chang, Sue-Min
;
Hsu, Ying-Ya
;
Chan, Ting-Shan
;
環境工程研究所
;
Institute of Environmental Engineering
In this study, a novel sol gel-derived Cu/TiO(2) adsorbent has been demonstrated to exhibit exceptional capacities of 40,62, 49.52, and 108.48 mg PH(3)/g Cu/TiO(2) for the oxidative capture of phosphine (PH(3)) in N(2), air, and humidified air, respectively. We have proposed the oxidative mechanisms for PH(3) on the Cu/TiO(2) sample on the basis of elemental, chemical state, functional group, and microstructural analysis. Moreover, the influence of O(2) and water vapor on the capture capacity is discussed. The transformation of PH(3) followed the sequence of PH(2) -> H(2)P-OH -> HP(OH)(2) -> P(OH)(3) -> HO-P=O -> H(3)PO(4). At the same time, the CuO/Cu(OH)(2) moieties in the TiO(2) lattice were reduced to Cu(0). The H(2)P-OH and HO-P=O are the two stable intermediates, and they occupied the active species to inhibit further chemisorption. Direct oxidation of PH(3) or the intermediates with adsorbed O(2) was not efficient. However, the Cu/TiO(2) sample catalyzed their interactions via reduction and then oxidation of the Cu(2)+ ions. Water vapor acts as a cocatalyst to facilitate the oxidation of the intermediates. The end product, H(3)PO(4), migrated to bound the TiO(2) support and free the CuO/Cu(OH)(2) for the following catalytic processes. Although competitive adsorption of water molecules initially retarded the adsorption rate, the high extent of oxidation greatly promoted the capture capacity of the Cu/TiO(2) in humidified air.
Chemical Capture of Phosphine by a Sol-Gel-Derived Cu/TiO2 Adsorbent - Interaction Mechanisms
(2011-02-10)
Chang, Sue-Min
;
Hsu, Ying-Ya
;
Chan, Ting-Shan
;
環境工程研究所
;
Institute of Environmental Engineering
In this study, a novel sol gel-derived Cu/TiO2 adsorbent has been demonstrated to exhibit exceptional capacities of 40,62, 49.52, and 108.48 mg PH3/g Cu/TiO2 for the oxidative capture of phosphine (PH3) in N-2, air, and humidified air, respectively. We have proposed the oxidative mechanisms for PH3 on the Cu/TiO2 sample on the basis of elemental, chemical state, functional group, and microstructural analysis. Moreover, the influence of O-2 and water vapor on the capture capacity is discussed. The transformation of PH3 followed the sequence of PH2 -> H2P-OH -> HP(OH)(2) -> P(OH)(3) -> HO-P=O -> H3PO4. At the same time, the CuO/Cu(OH)(2) moieties in the TiO2 lattice were reduced to Cu-0. The H2P-OH and HO-P=O are the two stable intermediates, and they occupied the active species to inhibit further chemisorption. Direct oxidation of PH3 or the intermediates with adsorbed O-2 was not efficient. However, the Cu/TiO2 sample catalyzed their interactions via reduction and then oxidation of the Cu-2+ ions. Water vapor acts as a cocatalyst to facilitate the oxidation of the intermediates. The end product, H3PO4, migrated to bound the TiO2 support and free the CuO/Cu(OH)(2) for the following catalytic processes. Although competitive adsorption of water molecules initially retarded the adsorption rate, the high extent of oxidation greatly promoted the capture capacity of the Cu/TiO2 in humidified air.
COLL 123-Effects of surface properties and textures of imprinted silica on recognition of bisphenol A
(2009-08-16)
Hsu, Shu-Kang
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
Determination of optimal phenanthrene, sulfate and biomass concentrations for anaerobic biodegradation of phenanthrene by sulfate-reducing bacteria and elucidation of metabolic pathway
(2009-11-15)
Tsai, Jen-Chieh
;
Kumar, Mathava
;
Chang, Sue-Min
;
Lin, Jih-Gaw
;
環境工程研究所
Anaerobic biodegradation of phenanthrene (PHE) was investigated using an enrichment culture consists predominantly of sulfate-reducing bacteria (87 +/- 6%). Aqueous biodegradation experiments were designed using the rotatable central composite design with five levels. The designed concentrations were 2-50 mg L(-1) for PHE, 480-3360 mg L(-1) for sulfate, and 5-50 mg L(-1) for initial biomass. Experimental results indicated that the biomass concentration was the most significant variable, followed by the sulfate and PHE concentrations. The desirability functions methodology (DFM) was applied to find out the maximum specific PHE removal rate (R(s)). The maximum R(s) of 9.0 mg g(-1) VSS d(-1) within the designed ranges was obtained when the initial PHE, sulfate and biomass concentrations were 18.5, 841 and 50 mg L(-1), respectively. The R(s) observed in the present study was higher than the values reported in the previous studies. Subsequently, a confirmation study was performed under the optimal conditions. and the results matched well with the R(s) estimated using DFM. Samples collected during PHE biodegradation experiments inferred the formation of two novel metabolic intermediates, 2-methyl-5-hydroxybenzaldehyde and 1-propenyl-benzene, and subsequently degraded to p-cresol, phenol and hydrocarbons. (C) 2009 Elsevier B.V. All rights reserved.
Effect of surface acidity on proton conductivity of sulfated and phosphated zirconia
(2009-08-16)
Sung, Pin-Hsin
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
Effects of analogue interferences on sensing performance of imprinted photonic crystal sensors
(2018-08-19)
Chang, Sue-Min
;
Chung, Wen-ching
;
環境工程研究所
;
Institute of Environmental Engineering
Effects of doped vanadium ions on the photocatalytic behavior of TiO(2) for CO(2) reduction
(2011-03-27)
Chang, Sue-Min
;
Lin, Chen-Yao
;
環境工程研究所
;
Institute of Environmental Engineering
Effects of doped vanadium ions on the photocatalytic behavior of TiO2 for CO2 reduction
(2011-03-27)
Chang, Sue-Min
;
Lin, Chen-Yao
;
環境工程研究所
;
Institute of Environmental Engineering
ENVR 196-Photocatalytic behavior of salicylic acid modified TiO2 for degradation of Bisphenol A
(2009-08-16)
Chang, Sue-Min
;
Chang, Chen-Tuan
;
環境工程研究所
;
Institute of Environmental Engineering
ENVR 32-Fabrication of novel Cu/TiO2-based imprinted polymers for detection of phosphine
(2009-08-16)
Chang, Sue-Min
;
Hsu, Ying-Ya
;
Yen, Shao-I
;
Li, Shou-Nan
;
環境工程研究所
Fluorescent Determination of Copper(II) in Industrial Wastewater Using Thiol-Capped Cadmium Sulfide-Zinc Sulfide Quantum Dots as the Probe
(2018-01-01)
Hsu, Shu-Kang
;
Chang, Zhao-Jun
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
In situ detection of Cu2+ ions in the effluent from thin-film transistor-liquid crystal display (TFT-LCD) manufacturing facility has been successfully achieved using thiol-capped CdS/ZnS quantum dots (QDs) as the fluorescence probes. Three types of ligands, including L-cysteine (LC), mercaptosuccinic acid (MSA), and thioglycolic acid (TGA), were used as capping agents for stabilizing and functionalizing the QDs. Fluorescence quenching of the QDs by Cu2+ ions was well fitted by the Stern-Volmer equation, indicating a static quenching process. Interaction between the Cu2+ ions and the thiol-based capping agents to form Cu-S bonding was responsible for the nonradiative decay. The thiol-capped probes exhibited low detection limits (0.016-0.063mgL(-1)), high recovery (81.7-114.5%), good precision (relative standard deviation=0.36-4.56%), and suitable accuracy for the detection of Cu2+ ions in the field samples, even though those that contained Ca2+, Mg2 +, Na+, K+, and ions, which were 300-16,600 times higher in concentration than the target. These results clearly verify the feasibility of using the QDs as an early warning system for assisting TFT-LCD manufacturing facilities in compliance with strict effluent standards (0.15mgL(-1)). Among the three types of thiol-capped QDs, the TGA-capped probes were the most sensitive and the LC-capped probes exhibited the highest errors. Substantial loading of the small TGA ligands on the surface and competitive complexation of the amino groups with Cu2+ ions are responsible for the benefits and the consequences of the TGA- and LC-capped QDs for Cu2+ sensing, respectively.
Imprinted copolymer/SiO2 hybrid for selective adsorption of bisphenol A
(2019-08-25)
Chin, Kae Zheng
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
INOR 401-Comparison of sulfated and phosphated zirconia on proton conductivity: Effect of surface acidic properties
(2008-08-17)
Sung, Pin-Hsin
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering
INOR 740-Fabrication of novel TiO2 photocatalysts with bone-skin-like porous structures
(2006-09-10)
Chang, Sue-Min
;
Sung, Ping-Shing
;
Hou, Chieh-yao
;
環境工程研究所
;
Institute of Environmental Engineering
Physicochemical characteristics of microbial content in a modified anaerobic inclining-baffled reactor (MAI-BR) treating recycled paper mill effluent (RPME)
(2019-04-21)
Zwain, Haider M.
;
Chang, Sue-Min
;
Dahlan, Irvan
;
環境工程研究所
;
Institute of Environmental Engineering
Microbial content formed in bioreactors plays a significant role in the anaerobic process. Therefore, the physicochemical characteristics of microbial content in a modified anaerobic inclining-baffled reactor (MAI-BR) treating recycled paper mill effluent (RPME) were investigated using Fourier transform infrared (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG), and derivative thermogravimetric (DTG) analyses, scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), Brunauer-Emmett-Teller (BET), and surface area analyzer. FTIR spectra revealed that the microbial content had stronger characteristic peaks corresponding to alcohols, water, lipids carbohydrates, proteins, and mineral compounds. Calcite, muscovite, and lepidolite were the prevalent mineral phases found by XRD analysis. The elemental of these minerals like C, Ca, N, O, and Si was confirmed by XPS results. The microbial content samples from each compartment showed similar thermal behavior. SEM images showed that straight rod-shaped and Methanosaeta-like microorganisms were predominant, whereas C, O, and Ca were noticed by EDS on the surface of granules. The BET surface areas and pores of granules are found to decline throughout the reactor's compartment, where Compartment 1 had the largest values. Thus, the findings of this study establish further understanding of the physicochemical properties of microbial content formed in MAI-BR during the RPME treatment.
PMSE 421-Study of the adsorption of a cationic surfactant on photoresist surfaces
(2006-09-10)
Chang, Sue-Min
;
Cheng, Han-Yun
;
Kao, I-Ling
;
Doong, Ruey-An
;
環境工程研究所
Roles of surface properties of amorphous TiO2 in photocatalytic CO2 reduction
(2019-08-25)
Kharade, Aparna
;
Chang, Sue-Min
;
環境工程研究所
;
Institute of Environmental Engineering