Degradation of Orange IV Dye Solution Catalyzed by PVDF/Fe3+-TiO2 Catalytic Membrane in the Presence of H2O2

2010 ◽  
Vol 150-151 ◽  
pp. 1705-1709
Author(s):  
Ying Jie Zhang ◽  
Li Zhang ◽  
Xiao Fei Ma ◽  
Li Li ◽  
Jun Ma
Keyword(s):  
Reaction Rate ◽  
Removal Rate ◽  
Sol Gel ◽  
Reaction Rate Constant ◽  
Catalytic Membrane ◽  
Electron Hole ◽  
Membrane Area ◽  
First Order Kinetics ◽  
Initial Ph ◽  
Ph Range

A new heterogeneous PVDF/Fe3+-TiO2 catalytic membrane is prepared by sol-gel method, which had a well catalytic activity to decompose H2O2. The effect of initial pH, e initial concentration of H2O2 and Orange IV, temperature, and membrane area on the reaction rate is discussed. The PVDF/Fe3+-TiO2 catalytic membrane can effectively decolorize Orange IV in the pH range of 3.0-5.0. The optimal concentration of H2O2 is 15mmol/L. The reaction rate constant is proportional to the initial concentrations of Orange IV. The higher the temperature, the faster the reaction rate is, this reaction follows pseudo-first-order kinetics with activation energy of 1.54kJ/mol. Reuse of catalyst did not decrease the removal rate of Orange IV. The experiments of t-butanol, EDTA and XPS measurement showed that •OH, the electron hole and the ferryl are all the reactive species in the degradation of Orange IV.

Solid Super Acid of S2O82- /FexOy-CuOx Catalytic Degradation of Orange IV

2011 ◽  
Vol 239-242 ◽  
pp. 182-185 ◽  
Author(s):  
Ying Jie Zhang ◽  
Guo Rui Liu ◽  
Da Peng Li ◽  
Yue Xiao Tian ◽  
Li Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Reaction Rate ◽  
Reaction Rate Constant ◽  
Heterogeneous Fenton ◽  
First Order ◽  
First Order Kinetics ◽  
Initial Ph ◽  
Good Catalytic Activity ◽  
Super Acid ◽  
Pseudo First Order

Solid super acid (S2O82-/FexOy-CuOx) was prepared and used as a heterogeneous Fenton-like catalyst to decompose H2O2for the degradation of refractory dye Orange IV in water. The factors that affected the degradation of Orange IV were discussed in this heterogeneous Fenton-like system. The catalytic activity of S2O82-/FexOy-CuOxwas evaluated by the degradation of Orange IV and the decomposition of H2O2. The results show that the catalyst S2O82-/FexOy-CuOxhas a good catalytic activity. The reaction follows pseudo-first-order kinetics; the reaction rate constant has a good relationship with the concentration of H2O2. The degradation rate of Orange IV and the decomposition rate of H2O2increase with the increase of temperature and the dosage of catalyst whereas it decreases with the increase of the initial concentration of Orange IV and the initial pH.

Degradation of Orange IV Dye Solution Catalyzed by PVDF/ Fe3+/Cu2+ Membrane in the Presence of H2O2

2010 ◽  
Vol 150-151 ◽  
pp. 1697-1700
Author(s):  
Ying Jie Zhang ◽  
Li Li ◽  
Li Zhang ◽  
Jun Ma
Keyword(s):  
Activation Energy ◽  
Reaction Rate ◽  
Reactive Intermediates ◽  
Catalytic Membrane ◽  
Heterogeneous Fenton ◽  
Initial Concentration ◽  
Decolorization Rate ◽  
Initial Ph ◽  
Catalyst Dosage ◽  
Ph Range

A new kind of PVDF/Fe3+/Cu2+ catalytic membrane was prepared and used as a heterogeneous Fenton-like catalyst to degrade Orange IV in the presence of H2O2. The effect of initial concentration of H2O2 and Orange IV, initial pH, reaction temperature and catalyst dosage on the reaction rate was studied. The results show that the higher the concentration of H2O2, the faster the reaction rate is. The reaction rate increased with the increase of temperature with the activation energy 30.18KJ•mol-1. The PVDF/Fe3+/Cu2+ catalytic membrane can effectively decolorize Orange IV in the pH range of 3.1-5.3. The decolorization rate of Orange IV decreased with the increase of initial concentration of Orange IV. The decolorization rate of Orange IV increased with the increase of dosage of catalyst. The reactive intermediates for this reaction is HO• based on t-butanol experiments.

Catalytic ozonation of 2-dichlorophenol by metallic ions

2003 ◽  
Vol 47 (1) ◽  
pp. 77-82 ◽  
Author(s):  
C.-H. Ni ◽  
J.-N. Chen ◽  
P.-Y. Yang
Keyword(s):  
Reaction Rate ◽  
Removal Rate ◽  
Reaction Rate Constant ◽  
Manganese Concentration ◽  
Functional Improvement ◽  
Metallic Ions ◽  
Manganese Ions ◽  
Toc Removal ◽  
Mechanism Of Reaction ◽  
Initial Ph

This research is mainly to explore functional improvement by adding various kinds of metallic ions in the ozonation of 2-chlorophenol solution. During the experiment, various kinds of metallic ions (Pb+, Cu2+, Zn2+, Fe2+, Ti2+, and Mn2+) were added; it was found that the reaction rate increased in all cases. The best result was obtained by using manganese ions, followed by iron and titanium ions. At pH = 3 and 1 ppm Mn2+ concentration, the reaction rate was increased by three times. TOC removal rate was also increased from 12.6% to 38% at 60 min reaction time. Ozone self-decomposition with various kinds of metallic ions alone was tested. It was found the ozone self-decomposition coefficient is highly dependent on the reaction rate constant for ozonation of 2-chlorophenol. The improvement of reaction was relevant to the mechanism of reaction between ozone and metallic ions. Furthermore, the effect of adding manganese ions was studied. With the initial manganese concentration at 0-2 ppm, after gas exposure for 20 min the removal rate can be increased from 38% to 93%. TOC removal rate was increased from 11% to 38%. The reaction rate was improved more greatly at the initial pH = 3.

Removal of Refractory Organic Orange IV by Fe-Mn/GAC in the Presence of H2O2

2012 ◽  
Vol 466-467 ◽  
pp. 490-494 ◽  
Author(s):  
Ying Jie Zhang ◽  
Xia Liao ◽  
Shu Fen Xu ◽  
Da Peng Li ◽  
Qing Hu
Keyword(s):  
Reaction Rate ◽  
Removal Rate ◽  
Reaction Rate Constant ◽  
Active Species ◽  
Carbon Particles ◽  
Initial Ph ◽  
Catalytic Reactivity ◽  
Activated Carbon Particles ◽  
Catalyzed Oxidation ◽  
Iron And Manganese

A new heterogeneous catalyst Fe-Mn/GAC (iron and manganese were loaded into activated carbon particles) was prepared, which had a better catalytic reactivity to decompose H2O2 compared with Fe/GAC and Mn/GAC. The removal rate of Orange IV increased more than 10% with this catalyst compared with Fe/GAC and Mn/GAC. The effect of the initial concentration of H2O2, the initial dye concentration, the initial catalyst concentration, the initial pH and temperature on the reaction rate constant were also studied. The activated energy for Fe-Mn/GAC catalyzed oxidation of the dye was determined to be 66.16KJ/mol. Reuse of catalyst did not decrease the removal rate of Orange IV. The tert-butanol experiment indicated that there were not only hydroxyl radicals but also other active species in the system.

scholarly journals Effective Photocatalytic Degradation of Nitrobenzene by Magnetite Modified Titania Composite

2021 ◽  
Vol 33 (6) ◽  
pp. 1319-1324
Author(s):  
E.S. Kunarti ◽  
R. Roto ◽  
S. Sutarno ◽  
I.S. Budi ◽  
M. Mardiansyah
Keyword(s):  
Reaction Rate ◽  
Uv Light ◽  
Sol Gel ◽  
Solid Material ◽  
Reaction Rate Constant ◽  
Magnetic Photocatalyst ◽  
Uv Light Irradiation ◽  
Transmission Electron ◽  
Uv Visible ◽  
Co Precipitation

Magnetic photocatalyst of magnetite modified titania composite Fe3O4/TiO2 was prepared by co-precipitation and sol-gel methods followed by calcination at 450 ºC. The produced material was confirmed by XRD, FTIR spectrophotometer, vibrating sample magnetometer and transmission electron microscope. The solid material was tested as a photocatalyst for degradation of nitrobenzene under UV light irradiation. The progress of degradation of nitrobenzene was monitored by using a UV-visible spectrophotometer. The photodegradation of nitrobenzene could be best realized at a medium pH of 7 and 120 min of irradiation. The reaction rate constant of nitrobenzene degradation catalyzed by TiO2 and Fe3O4/TiO2 solids were found to be 0.0058 min-1 and 0.0092 min-1, respectively. The photocatalyst was recoverable by use of a magnetic bar and reusable.

scholarly journals Photocatalytic Reduction of Cr(VI) in the Presence of Humic Acid Using Immobilized Ce–ZrO2 under Visible Light

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 779 ◽  
Author(s):  
Fabrício Eduardo Bortot Coelho ◽  
Victor M. Candelario ◽  
Estêvão Magno Rodrigues Araújo ◽  
Tânia Lúcia Santos Miranda ◽  
Giuliana Magnacca
Keyword(s):  
Humic Acid ◽  
Sol Gel ◽  
Cost Effective ◽  
Industrial Applications ◽  
Photocatalytic Reduction ◽  
Electron Hole ◽  
Sol Gel Process ◽  
Initial Ph ◽  
Industry Effluent ◽  
Suspended Nanoparticles

Cr(VI) has several industrial applications but it is one of the most dangerous pollutants because of its carcinogenicity and high toxicity. Thus, the removal of Cr(VI) by photocatalytic reduction was investigated. The catalyst applied, Ce–ZrO2, was immobilized, through a sol–gel process on a silicon carbide (SiC) support, to increase the efficiency and avoid using suspended nanoparticles. The influence of initial pH, humic acid (HA), and catalyst dosage was investigated for Cr(VI) containing solutions. Then, a real galvanizing industry effluent (Cr(VI) = 77 mg L-1mg.L−1, Zn = 1789 mg L−1) was treated. It was observed that Cr(VI) adsorption and photoreduction are greatly favored at low pH values. HA can decrease Cr(VI) adsorption but also acts as holes scavenger, reducing the electron–hole recombination, favoring then the photoreduction. With the immobilized Ce–ZrO2, more than 97% of Cr(VI) was removed from the diluted effluent. These results indicate the feasibility to treat Cr(VI) effluents even in the presence of other metals and natural organic matter. The developed material has great chemical and mechanical resistances and avoids the use of nanoparticles, dangerous for the environment and hard to recover. Moreover, solar light can be used to drive the process, which contributes to the development of more sustainable, cleaner, and cost-effective wastewater treatments.

scholarly journals Photocatalytic Degradation of a Systemic Herbicide: Picloram from Aqueous Solution Using Titanium Oxide (TiO2) under Sunlight

2020 ◽  
Vol 4 (4) ◽  
pp. 58
Author(s):  
Md. Rakibul Islam ◽  
Jahida Binte Islam ◽  
Mai Furukawa ◽  
Ikki Tateishi ◽  
Hideyuki Katsumata ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Titanium Oxide ◽  
Irradiation Time ◽  
Degradation Mechanism ◽  
Chloride Ion ◽  
Reaction Rate Constant ◽  
Ammonium Ion ◽  
Light Reaction ◽  
First Order Kinetics ◽  
Initial Ph

The photocatalytic degradation of picloram (4-amino-3,5,6-trichloro-2-pyridincarboxylic acid), which is one of popular acidic herbicide, was investigated with the existence of titanium oxide (TiO2) under sunlight. The total photocatalytic degradation of 20 ppm of picloram was occurred within 30 min irradiation with TiO2, while a negligible degradation was found without TiO2 under sunlight. The influence of various parameters, like TiO2 dosage, solution initial pH, intensity of light, reaction temperature and irradiation time, was found during the photocatalytic degradation of picloram. The mineralization of picloram was proved by the deterioration of total organic carbon (TOC) of the photocatalytic process. The pseudo–first order kinetics of photocatalytic degradation was obtained according to the Langmuir–Hinshelwood model, and the reaction rate constant was 17.6 × 10−2 min−1. Chloride ion, ammonium ion, nitrate ion and CO2 were erected as the final products after completing the photocatalytic degradation of picloram. The intermediate products could not be determined by the GC–MS during the degradation of picloram. Therefore, the degradation mechanism of the picloram was proposed based on the frontier electron density and the point charge at each atom of the picloram molecule. The photocatalytic degradation method, using sunlight, may develop into as a pragmatic technique to purify picloram contaminated wastewater.

Study on Photocatalytic Reduction of Cr(VI) by Fluorine-Doped TiO2

2017 ◽  
Vol 727 ◽  
pp. 841-846
Author(s):  
Shu Qin Wang ◽  
Bo Bi ◽  
Xue Juan Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Reduction Process ◽  
Ammonium Fluoride ◽  
Reaction Rate Constant ◽  
Photocatalytic Reduction ◽  
Calcination Time ◽  
First Order ◽  
Preparation Conditions ◽  
First Order Kinetics

To enhance the photocatalytic performance of nanoTiO2 on Cr (VI) reduction, we have prepared fluorine-doped TiO2 photocatalyst (named as F-TiO2 hereinafter) via sol-gel method. N-doped TiO2 (N-TiO2) was also prepared for comparison. XRD, BET and UV-vis DRS were used to characterize and analyze these samples. The photocatalytic activity of different photocatalysts was evaluated by Cr (VI) reduction experiments. Effects of preparation conditions, reaction kinetics and catalyst lifetime were discussed in this paper. The experimental results showed that the best preparation conditions were as follows: ammonium fluoride used as F source, F/Ti=0.1, calcination temperature=500°C and calcination time=3h. The photocatalytic reduction process conformed the first-order kinetics, and the reaction rate constant of F-TiO2 was 4 times as large as that of virgin TiO2. Characterizations also proved that F doping improved the photocatalytic activity of TiO2.

scholarly journals Parameter optimization and mechanism research of enhanced coagulation treatment for Yuquan River water

2020 ◽  
Vol 20 (3) ◽  
pp. 1072-1082
Author(s):  
Qianshu Sun ◽  
Shuang Zhao ◽  
Yubo Yan ◽  
Wenlin Jia ◽  
Weihua Yang
Keyword(s):  
River Water ◽  
Removal Rate ◽  
Coagulation System ◽  
Optimal Dosage ◽  
Solution Ph ◽  
Enhanced Coagulation ◽  
Coagulation Mechanism ◽  
Xuzhou City ◽  
Initial Ph ◽  
Ph Range

Abstract As one of the drinking water sources for Xuzhou city, Yuquan River has been polluted seriously in recent years. In this paper, enhanced coagulation technology was selected and various parameters (coagulant species, dosage, solution pH and coagulant aid species) were optimized for Yuquan River water treatment. Turbidity and UV254 removal rate were calculated to assess coagulation efficiencies, and meanwhile floc generation kinetics, zeta potential and scanning electron microscope (SEM) spectra were measured to study the coagulation mechanism. Results indicated that the coagulation effect of polyaluminium chloride (PAC) on Yuquan River water was better than that of aluminium sulphate (AS), and its optimal dosage was 20 mg/L. Flocs produced by PAC also exhibited larger size and faster growth velocity than those of AS. Moreover, the applicable initial pH range for Yuquan River was 6.0–9.0, and the optimal coagulation efficiency was observed at pH 7.0. When PAC or AS was selected as coagulant, the application of sodium alginate (SA) could improve turbidity and UV254 removal due to its adsorption bridging role. In addition, coagulation efficiency could be enhanced in an AS coagulation system when polyacrylamide (PAM) was dosed as coagulant aid.

scholarly journals Solar Photocatalytic Degradation of Typical Indoor Air Pollutants Using TiO2Thin Film Codoped with Iron(III) and Nitrogen

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Shuaijie Wang ◽  
Xingxing Cheng
Keyword(s):  
Indoor Air ◽  
Air Pollutants ◽  
Reaction Rate ◽  
Sol Gel ◽  
Visible Region ◽  
Reaction Rate Constant ◽  
Solar Light ◽  
Photocatalytic Ability ◽  
Vis Spectroscopy ◽  
Indoor Air Pollutants

A type of iron and nitrogen codoped titania thin film was prepared by sol-gel method to degrade three typical indoor air pollutants: formaldehyde (HCHO), ammonia (NH3), and benzene (C6H6) under solar light. X-ray diffraction (XRD), UV-Vis spectroscopy, and energy dispersive spectra (EDS) were employed to characterize the photocatalysts. The results showed that the Fe/N codoped TiO2had a stronger absorption in the visible region than pure, Fe-doped, and N-doped TiO2and exhibited excellent photocatalytic ability for the degradation of indoor HCHO, NH3, and C6H6. When the three pollutants existed in indoor air at the same time, the removal percentages of HCHO, NH3, or C6H6after 6 h photocatalytic reaction under solar light reached 48.8%, 50.6%, and 32.0%. The degradation reaction of the three pollutants followed the pseudo-first-order kinetics with the reaction rate constants in the order of 0.110 h−1for ammonia, 0.109 h−1for formaldehyde, and 0.060 h−1for benzene. The reaction rate constant decreased with the increase of initial reactant concentration, which reflected that there was oxidation competition between the substrate and its intermediate during the photocatalytic process.

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