Photocatalytic degradation of humic acid in saline waters Part 2. Effects of various photocatalytic materials

2003 ◽  
Vol 246 (1) ◽  
pp. 39-48 ◽  
Author(s):  
R Al-Rasheed
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Saline Waters ◽  
Photocatalytic Materials

scholarly journals TiO2 BEADS FOR PHOTOCATALYTIC DEGRADATION OF HUMIC ACID IN PEAT WATER

2011 ◽  
Vol 11 (3) ◽  
pp. 253-257 ◽  
Author(s):  
Winarti Andayani ◽  
Agustin N M Bagyo
Keyword(s):  
Aqueous Solution ◽  
Humic Acid ◽  
Oxalic Acid ◽  
Chemical Oxygen Demand ◽  
Photocatalytic Degradation ◽  
Uv Light ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Color Intensity ◽  
Before And After

Degradation of humic acid in aqueous solution containing TiO2 coated on ceramics beads under irradiation of 254 nm UV light has been conducted in batch reactor. The aim of this experiment was to study photocatalytic degradation of humic acid in peat water. The irradiation of the humic acid in aqueous solution was conducted in various conditions i.e solely uv, in the presence of TiO2-slurry and TiO2 beads. The color intensity, humic acid residue, conductivity and COD (chemical oxygen demand) of the solution were analyzed before and after irradiation.  The compounds produced during photodegradation were identified using HPLC. The results showed that after photocatalytic degradation, the color intensity and the COD value of the solution decreased, while the conductivity of water increased indicating mineralization of the peat water occurred. In addition, oxalic acid as the product of degradation was observed.

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.

Photocatalytic degradation of humic acid in the presence of montmorillonite

2013 ◽  
Vol 75-76 ◽  
pp. 60-66 ◽  
Author(s):  
Sibel Sen Kavurmaci ◽  
Miray Bekbolet
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation

Effect of silver on the photocatalytic degradation of humic acid

2008 ◽  
Vol 131 (1-4) ◽  
pp. 250-254 ◽  
Author(s):  
Ankesh Bansal ◽  
S. Madhavi ◽  
Timothy Thatt Yang Tan ◽  
T.M. Lim
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation

scholarly journals Improving the ZnO-photocatalytic degradation of humic acid using powdered residuals from water purification plant

2021 ◽  
Author(s):  
Mohamed Elmougi ◽  
Hisham El-Etriby ◽  
Ragab Barakat ◽  
Mohamed Gar Alalm ◽  
Mohamed Mossad
Keyword(s):  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Removal Efficiency ◽  
Water Purification ◽  
Degradation Kinetics ◽  
Irradiation Time ◽  
Treatment Plant ◽  
Operating Conditions ◽  
Coefficient Of Determination ◽  
Purification Plant

Abstract Alum residuals were collected from a water treatment plant and used for improving the photocatalytic degradation of humic acid (HA) by combinations of zinc oxide (ZnO) and powdered residuals from water purification plant (PRWPP). The influence of operating conditions such as initial humic acid concentration, pH, irradiation time, PRWPP to ZnO ratio, catalyst dose, and light illuminance have been investigated. The optimum PRWPP to ZnO ratio was 10:90. Using the prepared composites instead of bare ZnO raised the HA removal efficiency from 85.5% to 97.8%, and from 38% to 48.1% at catalyst doses of 1.2 g/l and 0.4 g/l, respectively. Moreover, it reduced energy consumption from 210.4 to 166.2 Wh per mg of HA. An artificial neural network model (ANN) was developed to predict the removal efficiency under different operating conditions. The optimum ANN structure yielded a coefficient of determination (R2 = 0.993). Modified Langmuir-Hinshelwood pseudo-first-order model was used for describing the degradation kinetics at different initial concentrations of HA.

scholarly journals Efficiency of Photocatalytic Degradation of Humic Acid Using Magnetic Nanoparticles (Fe-doped TiO2@Fe3O4) in Aqueous Solutions

Health Scope ◽  
2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Hossein Moein ◽  
Gholamreza Nabi Bidhendi ◽  
Naser Mehrdadi ◽  
Hossein Kamani
Keyword(s):  
Magnetic Nanoparticles ◽  
Humic Acid ◽  
Aqueous Solutions ◽  
Photocatalytic Degradation ◽  
High Efficiency ◽  
Sol Gel ◽  
Reaction Times ◽  
Doped Tio2 ◽  
Natural Organic Matters ◽  
Uv Lamp

Background: Among water pollutants, Natural Organic Matters (NOMs) are highly important for making problems in water treatment plants. Objectives: The main objective of this study was to investigate the efficiency of photocatalytic degradation of humic acid using magnetic nanoparticles (Fe-doped TiO2@Fe3O4) in aqueous solutions. Methods: In the present experiment, Fe-doped TiO2@Fe3O4 nanoparticles were synthesized by the sol-gel method, and SEM, XRD, and DRS analyzes were utilized to characterize the synthesized nanoparticles. The effects of various variables, including pH (3 - 11), initial concentration of humic acid (20 - 80 mg/L), and concentration of nanoparticles (250 - 2000 mg/L) at different reaction times (15 - 60 min) were investigated on the photocatalytic degradation of humic acid. Results: The maximum degradation efficiency of humic acid at pH 3, the initial humic acid concentration of 5 mg/L, nanoparticle dose of 400 mg/L, and reaction time of 60 min using a 15-W bare UV lamp. Conclusions: Due to the high efficiency of photocatalytic degradation, it is proposed to use for the removal of humic acid from water resources.

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