scholarly journals Oxidative Degradation of Methylene Blue via PDS-Based Advanced Oxidation Process Using Natural Pyrite

2019 ◽  
Vol 16 (23) ◽  
pp. 4773 ◽  
Author(s):  
Liang Sun ◽  
Dehao Hu ◽  
Ziyu Zhang ◽  
Xiaoyan Deng
Keyword(s):  
Methylene Blue ◽  
Advanced Oxidation Process ◽  
Oxidative Degradation ◽  
Advanced Oxidation ◽  
Strong Acid ◽  
Alkaline Condition ◽  
Heterogeneous Catalytic ◽  
Chemical Conditions ◽  
Ph Range ◽  
Natural Pyrite

H2O2- and PDS-based reactions are two typical advanced oxidation processes (AOPs). In this paper, a comparative study of H2O2/PDS-based AOPs employing natural pyrite as a catalyst to degrade methylene blue (MB) was reported. The adaptive pH range in pyrite/PDS extended from 3 to 11, in contrast to the narrow effective pH range of 3–7 in pyrite/H2O2. As a result of the iron leaching, a synergistic effect of both homogeneous and heterogeneous catalysis was observed in pyrite/PDS, whereas heterogeneous catalytic oxidation dominated pyrite/H2O2. Furthermore, the batch results showed that the MB removal by pyrite/PDS was highly dependent on chemical conditions (e.g., pH, pyrite and PDS concentration, temperature). Powerful SO4•− was generated by pyrite rapidly under acidic or weakly acidic conditions, while SO4•− and PDS were assumed by OH− under alkaline condition. The lower pyrite loading (from 0.1 to 0.5 g/L) was affected the removal efficiency obviously, while the scavenging of SO4•− did not seem to be remarkable with the excessive amounts of pyrite (>0.5 g/L). Excessive amounts of PDS (>2 mmol/L) might negatively affect the pyrite/PDS system. The reaction temperature that increased from 20 to 40 °C had a positive effect on the degradation of MB. SEM and XRD showed that the passivation of catalyst did not occur due to the strong acid-production ability of pyrite/PDS, inhibiting the formation of Fe-oxide covering the pyrite surface.

1,3-Disulfoimidazolium chloronickellate immobilized HZSM-5 framework as visible-light-induced heterogeneous photocatalyst for advanced oxidation process

2018 ◽  
Vol 42 (5) ◽  
pp. 3867-3877 ◽  
Author(s):  
Susmita Saikia ◽  
Pinky Gogoi ◽  
Ruli Borah
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Oxidative Degradation ◽  
Advanced Oxidation ◽  
Wet Impregnation

Hybrid photocatalysts of [Dsim]2[NiCl4]/HZSM-5 were prepared by wet impregnation and their application is demonstrated as feasible heterogeneous photocatalysts for oxidative degradation of methylene blue under sunlight.

Oxidative degradation of endotoxin by advanced oxidation process (O3/H2O2 & UV/H2O2)

2014 ◽  
Vol 279 ◽  
pp. 105-110 ◽  
Author(s):  
Byung-Taek Oh ◽  
Young-Suk Seo ◽  
Dega Sudhakar ◽  
Ji-Hyun Choe ◽  
Sang-Myeong Lee ◽  
...  
Keyword(s):  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Oxidative Degradation ◽  
Advanced Oxidation

Ozone catalysed with solids as an advanced oxidation process for landfill leachate treatment

2007 ◽  
Vol 55 (12) ◽  
pp. 237-243 ◽  
Author(s):  
C. Tizaoui ◽  
L. Mansouri ◽  
L. Bousselmi
Keyword(s):  
Advanced Oxidation Process ◽  
Catalyst Concentration ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Catalytic Ozonation ◽  
Expanded Perlite ◽  
Landfill Leachates ◽  
Leachate Treatment ◽  
Gas Concentration ◽  
Heterogeneous Catalytic

Heterogeneous catalytic ozonation (HCO) of wastewater is gaining both research and industrial interests. It is proved to be an advanced oxidation process since it involves hydroxyl radicals as oxidation species. Few studies have been carried out to test HCO in the treatment of landfill leachates. This work has been carried out to test three types of catalysts: activated carbon (AC), expanded perlite (EP) and titanium dioxide (TiO2) combined with ozone at 80 g/m3 gas concentration for the treatment of a leachate generated by Jebel Chakir landfill site near Tunis–capital of Tunisia. The work has shown a reduction in COD of about 45% and an increase in biodegradability (BOD5/COD) from 0.1 to 0.34. A catalyst concentration of 0.7 g/L was found optimal for the treatment of the leachate.

scholarly journals Degradation of fluorescent dye-Solvent Green 7 (HPTS) in wastewater by advanced oxidation process

2020 ◽  
Vol 82 (11) ◽  
pp. 2525-2535
Author(s):  
Shaokang Cai ◽  
Shurong Zhang ◽  
Canzhu Gao ◽  
Zhongfa Cheng
Keyword(s):  
Advanced Oxidation Process ◽  
Advanced Oxidation ◽  
Strong Acid ◽  
Degradation Process ◽  
Chloride Ions ◽  
Fluorescent Dye ◽  
Degradation Efficiency ◽  
Oxidant Concentration ◽  
Fluorescence Characteristics ◽  
Polycyclic Aromatic

Abstract Solvent Green 7 (HPTS) is a widely used fluorescent dye. As a kind of polycyclic aromatic hydrocarbon (PAHs) derivative, HPTS would cause pollution when it is discharged into the environment. This study adopted advanced oxidation processes (UV/H2O2) to degrade the HPTS in aqueous solution and investigated the effects of various factors on the degradation. The results showed that: the initial concentration and the fluorescence characteristics of HPTS reduced the degradation efficiency. When the oxidant concentration of H2O2 was 3 mg/L, the degradation efficiency and cost of HPTS (20 mg/L) were the most appropriate; when there were various inorganic anions in the solution, the degradations were not affected, but when the solution was strong acid and there existed a lot of chloride ions, the degradation of HPTS was inhibited. The degradation pathways indicated HPTS degraded into naphthalene derivatives, benzene derivatives through oxidation and decarboxylation reactions, finally into water and carbon dioxide. Further research for substances similar to HPTS structure will make progress in understanding the degradation process of PAHs.

Synthesis and Characterization of Copper Oxide Composite and Study of Composite Mediated Photo-Oxidative Degradation of Methylene Blue under Visible Light

2016 ◽  
Vol 63 ◽  
pp. 29-35
Author(s):  
Md Ataur Rahman ◽  
Tajmeri S.A. Islam
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Copper Oxide ◽  
Oxidative Degradation ◽  
Band Gap Energy ◽  
Reflectance Measurement ◽  
Oxide Composite ◽  
Cyclic Mechanism ◽  
Ph Range

Copper oxide composite was prepared from copper (II) acetate. Characterization of composite was performed by Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), FT-IR Spectroscopy and X-ray diffractometry. According to the findings of SEM the particle size was within the range from 450 nm to 550 nm. Band gap energy was determined by reflectance measurement and value was found to be 4.21 eV. From the result of EDS, it appears that the composite contains only Cu and O atoms. Result of XRD confirms that the composite contains CuO, Cu2O and metallic Cu. FTIR spectrum of composite supports the presence of Cu2O. Adsorptive and catalytic properties of composite were studied using Methylene blue as adsorbent. Photo-oxidative degradation of MB was investigated in the suspension of composite in separate experiments at different pH ranging from 2.5 to 5.5 under visible light. Low pH range from 2.5 to 3.5 is most effective for degradation. This was explained by proposing a cyclic mechanism which suggests the conversion of Cu22+ to Cu2+ and vice versa. 95.5% of MB was found to degrade when 5×10-5 M solution of MB was irradiated for three hours in 100 mL suspension of composite having concentration 1gL-1 at pH 2.5.

Dye house wastewater treatment through advanced oxidation process using Cu-exchanged Y zeolite: A heterogeneous catalytic approach

Chemosphere ◽  
2008 ◽  
Vol 70 (6) ◽  
pp. 1146-1151 ◽  
Author(s):  
Nishtar Nishad Fathima ◽  
Rathinam Aravindhan ◽  
Jonnalagadda Raghava Rao ◽  
Balachandran Unni Nair
Keyword(s):  
Wastewater Treatment ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Zeolite A ◽  
Y Zeolite ◽  
Heterogeneous Catalytic

scholarly journals PHOTOLYSIS OF METHYLENE BLUE DYE USING AN ADVANCED OXIDATION PROCESS (ULTRAVIOLET LIGHT AND HYDROGEN PEROXIDE)

2021 ◽  
Vol 25 (01) ◽  
pp. 59-67
Author(s):  
Hanadi A. Mohammed ◽  
◽  
Seroor A. Khaleefa ◽  
Mohammed I. Basheer ◽  
◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Ultraviolet Light ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Optimum Concentration ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
H2o2 Oxidation

Photolysis of methylene blue was studied by using an advanced UV/H2O2 oxidation process. This study investigated different initial dye concentrations (I0, 20, 30 ppm) using different concentrations of H2O2 (10 %, 30%, 50 %) in three additions (5 mL, 10 mL, 15 mL). The results showed that the degradation efficiencies of this dye at different concentrations were as follows: 99.86 % at 10 ppm using 15 mL of 10 % H2O2 after 60 min, 99.22 % at 20 ppm using 15 mL of 30 % H2O2 for 60 min, and 98.90 % at 30ppm using 15 mL of 50 % H2O2 after 90 min. An increase in the optimum concentration of H2O2 was observed with an increase in the initial dye concentration. The de-coloration time also increased with increasing initial dye concentration.

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