Mineralization of high saline petrochemical wastewater using Sonoelectro-activated persulfate: Degradation mechanisms and reaction kinetics

2019 ◽  
Vol 147 ◽  
pp. 1075-1082 ◽  
Author(s):  
Nader Yousefi ◽  
Sudabeh Pourfadakari ◽  
Shirin Esmaeili ◽  
Ali Akbar Babaei
Keyword(s):  
Reaction Kinetics ◽  
Degradation Mechanisms ◽  
Petrochemical Wastewater ◽  
Activated Persulfate

Heterogeneous Fenton-like oxidation of petrochemical wastewater using a magnetically separable catalyst (MNPs@C): process optimization, reaction kinetics and degradation mechanisms

RSC Advances ◽  
2016 ◽  
Vol 6 (88) ◽  
pp. 84999-85011 ◽  
Author(s):  
Babak Kakavandi ◽  
Ali Akbar Babaei
Keyword(s):  
Reaction Kinetics ◽  
Organic Compounds ◽  
Process Optimization ◽  
Oh Radicals ◽  
Magnetic Composite ◽  
Degradation Mechanisms ◽  
Petrochemical Wastewater ◽  
Heterogeneous Fenton ◽  
Magnetically Separable Catalyst ◽  
Magnetically Separable

MNPs@C magnetic composite was synthesized and applied as a heterogeneous catalyst in the Fenton oxidation for PCW treatment. The organic compounds were degraded by the ˙OH radicals released from decomposition of H2O2 in the presence of MNPs@C.

scholarly journals Degradation of Ketamine and Methamphetamine by the UV/H2O2 System: Kinetics, Mechanisms and Comparison

Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2999
Author(s):  
De-Ming Gu ◽  
Chang-Sheng Guo ◽  
Qi-Yan Feng ◽  
Heng Zhang ◽  
Jian Xu
Keyword(s):  
Reaction Kinetics ◽  
Rate Constants ◽  
Water Environment ◽  
Degradation Mechanisms ◽  
Psychoactive Substances ◽  
Pseudo First Order Reaction ◽  
Potential Harm ◽  
First Order ◽  
Effective Removal ◽  
H2o2 System

The illegal use and low biodegradability of psychoactive substances has led to their introduction to the natural water environment, causing potential harm to ecosystems and human health. This paper compared the reaction kinetics and degradation mechanisms of ketamine (KET) and methamphetamine (METH) by UV/H2O2. Results indicated that the degradation of KET and METH using UV or H2O2 alone was negligible. UV/H2O2 had a strong synergizing effect, which could effectively remove 99% of KET and METH (100 μg/L) within 120 and 60 min, respectively. Their degradation was fully consistent with pseudo-first-order reaction kinetics (R2 > 0.99). Based on competition kinetics, the rate constants of the hydroxyl radical with KET and METH were calculated to be 4.43 × 109 and 7.91 × 109 M−1·s−1, respectively. The apparent rate constants of KET and METH increased respectively from 0.001 to 0.027 and 0.049 min−1 with the initial H2O2 dosage ranging from 0 to 1000 μM at pH 7. Their degradation was significantly inhibited by HCO3−, Cl−, NO3− and humic acid, with Cl− having relatively little effect on the degradation of KET. Ultraperformance liquid chromatography with tandem mass spectrometry was used to identify the reaction intermediates, based on which the possible degradation pathways were proposed. These promising results clearly demonstrated the potential of the UV/H2O2 process for the effective removal of KET and METH from contaminated wastewater.

scholarly journals Degradation of UV Filter Ethyl 4-Aminobenzoate (Et-PABA) Using a UV-Activated Persulfate Oxidation Process

2019 ◽  
Vol 9 (14) ◽  
pp. 2873
Author(s):  
Ruirui Han ◽  
Qiang Wu ◽  
Chihao Lin ◽  
Lingfeng Zhang ◽  
Zhicai Zhai ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Removal Rate ◽  
Inhibitory Effect ◽  
Aminobenzoic Acid ◽  
Degradation Mechanisms ◽  
Broad Application ◽  
Initial Concentration ◽  
Persulfate Oxidation ◽  
Activated Persulfate ◽  
Application Prospects

In this paper, the ultraviolet/persulfate (UV/PDS) combined oxidation process was used to remove the ethyl 4-aminobenzoate (Et-PABA), one of the typical 4-aminobenzoic acid (PABA)-type UV filters. The effects of various factors on the removal of Et-PABA using the UV/PDS process were investigated, and the degradation mechanisms of Et-PABA were explored. The results showed that the UV/PDS process can effectively remove 98.7% of Et-PABA within 30 min under the conditions: UV intensity of 0.92 mW·cm−2, an initial concentration of Et-PABA of 0.05 mM, and a PDS concentration of 2 mM. The removal rate of Et-PABA increased with the increase in PDS dosage within the experimental range, whereas humic acid (HA) had an inhibitory effect on Et-PABA removal. Six intermediates were identified based on HPLC–MS and degradation pathways were then proposed. It can be foreseen that the UV/PDS oxidation process has broad application prospects in water treatment.

Study of C2H5O2 using modulated photolysis: ultra-violet spectrum and self-reaction kinetics in the temperature range 233-363 K

1997 ◽  
Vol 94 ◽  
pp. 484-502
Author(s):  
S Fauvet ◽  
JP Ganne ◽  
J Brion ◽  
D Daumont ◽  
J Malicet ◽  
...  
Keyword(s):  
Reaction Kinetics ◽  
Ultra Violet ◽  
Temperature Range
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