Photocatalytic Degradation of Humic Acid Using Ti/Anodized TiO2 Metal Plate with Fe-Doping

2012 ◽  
Vol 724 ◽  
pp. 33-36 ◽  
Author(s):  
Jong Oh Kim ◽  
Seung Pil Choi ◽  
Geon Tae Kim ◽  
Yong Hak Kim
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Surface Area ◽  
Acid Concentration ◽  
Uv Irradiation ◽  
Metal Plate ◽  
Fe Doping ◽  
Treatment Efficiency ◽  
Acid Degradation ◽  
Hypochromic Effect

We evaluated the treatment efficiency of humic acid using Ti and anodized TiO2metal plate with/without Fe-doping. Variation of humic acid concentration after 60 minutes of UV irradiation in the case of Ti only, Fe-Ti, TiO2only and Fe-TiO2was about 3.0%, 5.5%, 9.8% and 9.2%, respectively. . It is found that hypochromic effect was revealed in all cases with respect to doping time. Fe doping method is considered to be effective for humic acid degradation in spite of relatively low surface area of Ti and anodized TiO2metal plate.

scholarly journals The Role of Humic Acid, PP Beads, and pH with Water Backwashing in a Hybrid Water Treatment of Multichannel Alumina Microfiltration and PP Beads

Membranes ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 3 ◽  
Author(s):  
Sungju Hwang ◽  
Yooju Lee ◽  
Jin Yong Park
Keyword(s):  
Humic Acid ◽  
Water Treatment ◽  
Uv Irradiation ◽  
Membrane Fouling ◽  
Treatment Process ◽  
Fouling Resistance ◽  
Treatment Efficiency ◽  
Water Treatment Process ◽  
Inorganic Molecules

Photooxidation oxidizes most organic compounds by mineralizing them to small inorganic molecules. In this study, the effects of dissolved organic matter (DOM), pH, and polypropylene (PP) beads concentration on membrane fouling were investigated in a hybrid water treatment process consisting of seven-channel alumina microfiltration (pore size 1.0 μm) and pure PP beads water backwashing with UV irradiation for photooxidation. The synthetic feed was prepared with humic acid and kaolin and flowed inside the microfiltration (MF) membrane. The permeate contacted the PP beads fluidized in the gap of the membrane and module with outside UV irradiation. Membrane fouling resistance (Rf) increased dramatically with an increase in the concentration of humic acid (HA) from 6 mg/L to 8 mg/L. The treatment efficiency of DOM increased dramatically, from 14.3% to 49.7%, with an increase in the concentration of HA. The Rf decreased with an increase of PP beads concentration. However, maximum permeate volume (VT) was acquired at 5 g/L of PP beads. The maximal treatment efficiency of DOM was 51.3% at 40 g/L of PP beads. The Rf increased with an increase in the pH of feed, and the maximum VT was acquired at a pH of 5. The maximal treatment efficiency of DOM was 52.5% at pH 9.

Evaluation of photocatalytic degradation of a commercial humic acid in water using a simulated solar UV irradiation and monitoring the changes by size exclusion chromatography

2011 ◽  
Vol 11 (6) ◽  
pp. 692-698 ◽  
Author(s):  
S. Valencia ◽  
J. Marín ◽  
G. Restrepo ◽  
F. H. Frimmel
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Size Exclusion Chromatography ◽  
Uv Irradiation ◽  
Molecular Size ◽  
Size Exclusion ◽  
Size Fractions ◽  
Preferential Adsorption ◽  
Exclusion Chromatography ◽  
Solar Uv

Much research has been undertaken on the photocatalytic degradation of humic substances with titanium dioxide using commercial humic acids (HA), which are extracts from either peat or coal. Most of the research has been focused on the changes in dissolved organic carbon (DOC) and UV254 absorption. These parameters only give a general assessment. This work studies the changes in the physical and structural properties of a commercial humic acid by size exclusion chromatography with DOC and UV254 absorption detection (SEC-DOC, SEC-UV254), and the evolution of halogenated organic compounds (AOX) and trihalomethanes (THMs) during the photocatalytic degradation with simulated solar UV irradiation and Degussa P-25 TiO2. These changes are compared with those reported for natural organic matter (NOM). The photodegradation of commercial HA and NOM proceeds in a similar and sequential manner, initially with the preferential adsorption of larger molecules, then the degradation of these larger molecular size fractions and proceeding towards smaller molecular size fractions, while decreasing THMs and AOX formation potential.

Preparation and Application of Titanate Nanotubes on Methylene Blue Degradation from Aqueous Media

2011 ◽  
Vol 117-119 ◽  
pp. 786-789 ◽  
Author(s):  
Wen Churng Lin ◽  
Wein Duo Yang ◽  
Zen Ja Chung ◽  
Hui Ju Chueng
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Uv Irradiation ◽  
Aqueous Media ◽  
Hydrothermal Process ◽  
Reaction Times ◽  
Titanate Nanotubes ◽  
Methylene Blue Degradation ◽  
Bet Analysis

Titanate nanotubes were synthesized at various hydrothermal temperatures and reaction times by the hydrothermal process and used as photocatalyst. BET analysis was conducted in order to find out the surface area of these as-prepared samples and it was found that the surface area increases with rise in temperature till 130 oC. Synthesized as-prepared titanate nanotubes were applied on methylene blue degradation from aqueous media by UV irradiation. It was observed that dye removes ~99% from the aqueous media at a titanate nanotubes dose of 2 g/L.

scholarly journals Comparative Solid Phase Photocatalytic Degradation of Polythene Films with Doped and Undoped TiO2Nanoparticles

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Wasim Asghar ◽  
Ishtiaq A. Qazi ◽  
Hassan Ilyas ◽  
Aftab Ahmad Khan ◽  
M. Ali Awan ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Ftir Spectroscopy ◽  
Uv Radiation ◽  
Uv Irradiation ◽  
Weight Reduction ◽  
Solid Phase ◽  
Sem Analysis ◽  
Artificial Light ◽  
Metal Doping

Comparative photocatalytic degradation of polythene films was investigated with undoped and metal (Fe, Ag, and Fe/Ag mix) doped TiO2nanoparticles under three different conditions such as UV radiation, artificial light, and darkness. Prepared photocatalysts were characterized by XRD, SEM, and EDS techniques. Photocatalytic degradation of the polythene films was determined by monitoring their weight reduction, SEM analysis, and FTIR spectroscopy. Weight of PE films steadily decreased and led to maximum of 14.34% reduction under UV irradiation with Fe/Ag mix doped TiO2nanoparticles and maximum of 14.28% reduction under artificial light with Ag doped TiO2nanoparticles in 300 hrs. No weight reduction was observed under darkness. Results reveal that polythene-TiO2compositing with metal doping has the potential to degrade the polythene waste under irradiation without any pollution.

scholarly journals Ultrathin Co–Fe hydroxide nanosheet arrays for improved oxygen evolution during water splitting

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 22818-22824 ◽  
Author(s):  
Tingting Zhou ◽  
Zhen Cao ◽  
Heng Wang ◽  
Zhen Gao ◽  
Long Li ◽  
...  
Keyword(s):  
Surface Area ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Active Sites ◽  
Three Dimensional ◽  
Fe Doping ◽  
Nanosheet Arrays ◽  
Fe Hydroxide

The Fe-doping of hierarchical Co hydroxide nanosheet arrays (CoyFe1−y(OH)x NSAs) integrated on a three-dimensional electrode is shown to contribute to both increasing the available surface area and number of active sites.

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