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.

Novel photochemical advanced oxidation process for the removal of polycyclic aromatic hydrocarbons from polluted concrete

2017 ◽  
Vol 312 ◽  
pp. 99-105 ◽  
Author(s):  
Vladimir M. Nikolić ◽  
Slavko D. Karić ◽  
Željka M. Nikolić ◽  
Miloš S. Tošić ◽  
Gvozden S. Tasić ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Polycyclic Aromatic

Removal of Polycyclic Aromatic Hydrocarbons from Water Using Mn(III)-Based Advanced Oxidation Process

2021 ◽  
Vol 147 (3) ◽  
pp. 04021002
Author(s):  
Jian Fang ◽  
Renzun Zhao ◽  
Balaji Rao ◽  
Magdalena Rakowska ◽  
Dimitrios Athanasiou ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Polycyclic Aromatic

Optimum and Efficiency of Chloramphenicol Degradation by UV/H2O2 Process

2013 ◽  
Vol 838-841 ◽  
pp. 2677-2680 ◽  
Author(s):  
Yan Bo Li ◽  
Cui Ping Wang ◽  
Ming Yue Zheng ◽  
Kai Jun Wang
Keyword(s):  
Reaction Time ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Ph Value ◽  
Advanced Oxidation ◽  
Degradation Efficiency ◽  
Complete Degradation ◽  
Initial Ph ◽  
Operation Parameters

Degradation of chloramphenicol (CAP) by an advanced oxidation process, UV/H2O2, was investigated. Firstly, effect of H2O2 concentration, initial pH value, K2S2O8 concentration and reaction time on chloramphenicol degradation by UV/H2O2 process was studied. In addition, all the operation parameters mentioned above were optimized. The results showed that the degradation efficiency of CAP can be obviously enhanced with increasing both H2O2 concentration and K2S2O8 concentration. Moreover, initial pH value had unapparent impact on the efficiency of chloramphenicol degradation. Nearly complete degradation of chloramphenicol was achieved under the conditions of H2O2 concentration 2mM, initial pH value 7.7, K2S2O8 concentration 1mM and reaction time 15min.

scholarly journals Degradation Efficiency and Kinetics Analysis of an Advanced Oxidation Process Utilizing Ozone, Hydrogen Peroxide and Persulfate to Degrade the Dye Rhodamine B

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 974
Author(s):  
Piotr Zawadzki ◽  
Małgorzata Deska
Keyword(s):  
Hydrogen Peroxide ◽  
Rhodamine B ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation Process ◽  
Dye Degradation ◽  
Advanced Oxidation ◽  
Degradation Process ◽  
Oxidation Processes ◽  
First Order Kinetics ◽  
Ozonation Process

In this study, the effectiveness of a rhodamine B (RhB) dye degradation process at a concentration of 20 mg/L in different advanced oxidation processes—H2O2/UV, O3/UV and PDS/UV—has been studied. The use of UV in a photo-assisted ozonation process (O3/UV) proved to be the most effective method of RhB decolorization (90% after 30 min at dye concentration of 100 mg/L). The addition of sulfate radical precursors (sodium persulfate, PDS) to the reaction environment did not give satisfactory effects (17% after 30 min), compared to the PDS/UV system (70% after 30 min). No rhodamine B decolorization was observed using hydrogen peroxide as a sole reagent, whereas an effect on the degree of RhB degradation was observed when UV rays strike the sample with H2O2 (33% after 30 min). The rhodamine B degradation process followed the pseudo-first-order kinetics model. The combined PDS/O3/UV process has shown 60% color removal after 30 min of reaction time at an initial dye concentration of 100 mg/L. A similar effectiveness was obtained by only applying ozone or UV-activated persulfate, but at a concentration 2–5 times lower (20 mg/L). The results indicated that the combined PDS/O3/UV process is a promising method for high RhB concentrations (50–100 mg/L) comparing to other alternative advanced oxidation processes.

scholarly journals Effective electrocatalytic elimination of chloramphenicol: Mechanism, degradation pathway, and toxicity assessment

2021 ◽  
Author(s):  
Haiyang Liu ◽  
Yihan Lv ◽  
Ya-nan Zhang ◽  
Yushu Zhang ◽  
Jiao Qu ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Advanced Oxidation Process ◽  
Parent Compound ◽  
Degradation Process ◽  
Quantitative Structure Activity Relationship ◽  
Degradation Pathway ◽  
Toxicity Assessment ◽  
Degradation Efficiency ◽  
Electrocatalytic Degradation ◽  
High Efficient

Abstract The residual antibiotics in different environmental media pose a serious threat to human health and the ecosystem. The high-efficient elimination of antibiotics is one of the foremost works. In this study, chloramphenicol (CAP) was eliminated efficiently by electrocatalytic advanced oxidation process with carbon nanotubes/agarose/indium tin oxide (CNTs/AG/ITO) electrode. The influences of different experimental parameters on the degradation efficiency were systematically studied. Under the optimal conditions (4 V potential, 10 wt% CNTs dosage, and pH = 10), the maximum degradation efficiency of CAP (20 mg L− 1) achieved 88% within 180 min. Besides, the electrocatalytic degradation pathway and mechanism for CAP were also investigated, •O2− played a major role in the process of electrocatalytic degradation. Based on the QSAR (quantitative structure-activity relationship) model, the toxicities of CAP and identified intermediates were analyzed. Compared with the parent compound, the maximal chronic toxicity of intermediate ((E)-3-(4-nitrophenyl)prop-1-ene-1,3-diol) for daphnid increased 197-fold. Besides, the hybrid toxicity of the degradation system was further confirmed via disk agar biocidal tests with Escherichia coli ATCC25922, which changed slightly during the degradation process. Based on the above results, it is worth noting that the degradation pathway and toxicity assessment should be paid more attention to the treatment of antibiotic wastewater.

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.

scholarly journals Degradation of paraquat herbicide using hybrid AOP process: statistical optimization, kinetic study, and estimation of electrical energy consumption

2021 ◽  
Vol 33 (1) ◽  
Author(s):  
Azam Ghavi ◽  
Ghadamali Bagherian ◽  
Hadi Rezaei-Vahidian
Keyword(s):  
Energy Consumption ◽  
Kinetic Studies ◽  
Electrical Energy ◽  
Degradation Process ◽  
Degradation Efficiency ◽  
Order Kinetic ◽  
Electrical Energy Consumption ◽  
Optimum Conditions ◽  
Oxidant Concentration ◽  
Order Kinetic Model

Abstract Background This work studied the performance of UV/PS/TiO2NPs and UV/PI/TiO2NPs as hybrid advanced oxidation processes for degradation of paraquat in aqueous solution, because this very toxic herbicide is used third most widely. Results The effects of several factors such as UV irradiation, initial oxidant concentration, TiO2 nanoparticles dosage, and pH on the degradation efficiency were investigated. The process optimization was performed by the central composite design as a tool of response surface methodology for 30 mgL−1 of the herbicide initial concentration at 25 ℃ and 40 min of degradation process. Based on the results, a degradation efficiency of 77% and 90% were obtained for the UV/PS/TiO2NPs and UV/PI/TiO2NPs processes, respectively, in the optimum conditions. The mineralization efficiency of the paraquat solution using UV/PS/TiO2NPs and UV/PI/TiO2NPs processes are about 32% and 55%, respectively, after 40 min. The kinetic studies show that both processes follow a pseudo-first-order kinetic model, and the kinetic constants are 0.0299 min−1 for the PS process and 0.0604 min−1 for the PI process. The electrical energy consumption was estimated to be about 481.60 kWhm−3 for the PS process and 238.41 kWhm−3 for the PI process. Conclusions The degradation and mineralization efficiency of the paraquat solution using the UV/PI/TiO2NPs process was more than that of the UV/PS/TiO2NPs process at the optimum conditions after 40 min.

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