scholarly journals A Comprehensive Assessment of Catalytic Performances of Mn2O3 Nanoparticles for Peroxymonosulfate Activation during Bisphenol A Degradation

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 993
Author(s):  
Li Chen ◽  
Wanyi Fu ◽  
Congyu Hou ◽  
Yulong Yang ◽  
Xihui Zhang
Keyword(s):  
Bisphenol A ◽  
Dominant Species ◽  
Degradation Rate ◽  
Tap Water ◽  
Transformation Products ◽  
Radical Oxidation ◽  
Toc Removal ◽  
Secondary Effluents ◽  
Mn2o3 Nanoparticles ◽  
Catalytic Performances

Catalytic performances of Mn2O3 nanoparticles for peroxymonosulfate (PMS) activation in bisphenol A (BPA) degradation were comprehensively investigated in this study. Experimental results showed that 10 mg/L BPA could be 100% degraded within 20 min with the dosages of 0.2 g/L Mn2O3 and 0.1 mM PMS. Moreover, Mn2O3 showed remarkable activity in activation of PMS and excellent adaptability in various real water matrices, including river water, tap water and secondary effluents. Based on the radical detection and scavenging experiments, it was found that both radical and non-radical oxidation contributed to the degradation of BPA and 1O2 was the dominant species in the degradation compared to •OH, SO4•− and O2•−. A total of 15 transformation products were identified by LC/MS-MS during BPA degradation in the Mn2O3/PMS system, and degradation pathways via three routes are proposed. Compared with lab-made catalysts reported in the literature, the Mn2O3 catalyst demonstrated its superiority in terms of its high TOC removal, low PMS consumption and fast degradation rate for BPA.

A fluorescent aptasensor based on berberine for ultrasensitive detection of bisphenol A in tap water

2021 ◽  
Author(s):  
Yuxin Wei ◽  
Yangyang Zhou ◽  
Yanli Wei ◽  
Chuan Dong ◽  
Li Wang
Keyword(s):  
Bisphenol A ◽  
Human Health ◽  
Food Packaging ◽  
Tap Water ◽  
Water Systems ◽  
Ultrasensitive Detection ◽  
Its Analysis ◽  
Potential Impact ◽  
Fluorescent Aptasensor

The residues of bisphenol A (BPA) in food packaging and water systems have potential impact on human health, therefore, its analysis and detection has drawn people's attention. In this work,...

scholarly journals Degradation of Bisphenol-A: A Contaminant of Emerging Concern Using Catalytic Ozonation By Activated Carbon Impregnated Nanocomposite-Bimetallic Catalyst

2021 ◽  
Author(s):  
Hariprasad Pokkiladathu ◽  
Salman Farissi ◽  
Anbazhagi Sakkarai ◽  
Muthukumar Muthuchamy
Keyword(s):  
Activated Carbon ◽  
Bisphenol A ◽  
Bimetallic Catalyst ◽  
Degradation Pathway ◽  
Catalytic Ozonation ◽  
Toc Removal ◽  
Treated Sample ◽  
Aromatic Degradation ◽  
Exponential Population Growth ◽  
Pollution Events

Abstract Rampant water pollution events and rising water demand caused by exponential population growth and depleting freshwater resources speak of an impending water crisis. The inability of conventional wastewater treatment systems to remove Contaminants of Emerging Concern (CEC) such as Bisphenol-A (BPA) beckons for new and efficient technologies to remove them from wastewater and water sources. Advanced oxidation processes such as ozonation are primarily known for their capability to oxidize and degrade organic entities in water but optimum mineralization levels were hard to achieve. In this study, we synthesized an activated carbon impregnated nanocomposite-bimetallic catalyst (AC/CeO2/ZnO) and used it along with ozonation to remove BPA from water. The catalyst was characterized using BET, XRD, FESEM, Raman spectra, and DLS studies. Catalytic ozonation achieved TOC removal 25% higher than non-catalytic ozonation process. The degradation pathway of BPA was proposed using LC-MS/LC-Q-TOF studies that found six main aromatic degradation byproducts. Catalytic ozonation and non-catalytic ozonation followed similar degradation pathways. The formation of persistent aliphatic acidic byproducts in the treated sample made TOC removal above 61% difficult.

scholarly journals Degradation of norfloxacin in aqueous solution with UV/peroxydisulfate

2019 ◽  
Vol 79 (12) ◽  
pp. 2387-2394 ◽  
Author(s):  
Honghai Xue ◽  
Siyu Gao ◽  
Na Zheng ◽  
Ming Li ◽  
Xue Wen ◽  
...  
Keyword(s):  
Degradation Kinetics ◽  
Removal Rate ◽  
Inorganic Ions ◽  
Transformation Products ◽  
Neutral Condition ◽  
Advanced Treatment ◽  
Ultrapure Water ◽  
Toc Removal ◽  
Laboratory Results ◽  
Removal Technology

Abstract The frequent detection of antibiotics in water bodies gives rise to concerns about their removal technology. In this study, the degradation kinetics and mechanisms of norfloxacin (NOR), a typical fluoroquinolone pharmaceutical, by the UV/peroxydisulfate (PDS) was investigated. NOR could be degraded effectively using this process, and the degradation rate increased with the increasing dosage of PDS but decreased with the increasing concentration of NOR. In real water, the degradation of NOR was slower than that in ultrapure water, which indicated that laboratory results cannot be directly used to predict the natural fate of antibiotics. Further experiments suggested that the degradation of NOR was the most fast under neutral condition, the existence of HA or FA inhibited the degradation of NOR, and the presence of inorganic ions (NO3−, Cl−, CO32− and HCO3−) had no significant effect on degradation of NOR. Total organic carbon (TOC) removal rate (40%) indicated NOR was not completely mineralized, and six transformation products were identified, and possible degradation pathways of NOR had been proposed. It can be prospected that UV/PDS technology could be used for advanced treatment of wastewater containing fluoroquinolones.

The effect of anionic and nonionic detergents on soil microfungi

1970 ◽  
Vol 48 (3) ◽  
pp. 583-589 ◽  
Author(s):  
Benny K. H. Lee
Keyword(s):  
Growth Rates ◽  
Dominant Species ◽  
Tap Water ◽  
Dry Weight ◽  
Control Soil ◽  
Treated Soil ◽  
Nonionic Detergent ◽  
Soil Microfungi ◽  
Nonionic Detergents

Surveys of the microfungal populations in potting soil watered with tap water, a solution of anionic 15-S-3A detergent (Tergitol, 15-S-3A), and a solution of nonionic 15-S-9 detergent (Tergitol, 15-S-9), revealed a greater reduction in propagule densities in the anionic detergent watered soil than in the nonionic detergent watered soil. In the anionic detergent study, 39 species, including six dominant species which contributed 58% of the isolates, were obtained from the treated soil. In the nonionic detergent study, both sample populations contained 29 species and the four to six dominants contributed 67–68% of the 100 isolates.Twenty-two isolates representing 10 dominant species were tested in vitro for sensitivity to the two detergents. All grew at the lowest concentration (10 p.p.m.) of both detergents. The growth rates of nine isolates increased with the addition of 10 p.p.m. of the anionic detergent; four isolates showed increased growth with 10 p.p.m. of the nonionic detergent. With increasing concentration of detergent from 100 to 1000 p.p.m., the growth rates of 21 of the 22 fungi decreased. Isolates recovered from detergent-treated soil grew better in the medium containing detergent than the same species recovered from the control soil. In concentrations of 1000 p.p.m., complete inhibition was displayed by four species in the anionic series compared to five species in the nonionic series. Both detergents affected pigmentation, exudate formation, and rigidity of the sporangiophore in several of the fungi.Fourteen of the 16 isolates tested used anionic detergent and 12 isolates used nonionic detergent as a carbon source for growth. Dry weight differences indicated that the anionic detergent was more available than the nonionic detergent.

Ozone-enhanced photocatalytic degradation of natural organic matter in water

2006 ◽  
Vol 6 (3) ◽  
pp. 53-61 ◽  
Author(s):  
P. Zhang ◽  
L. Jian
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Photocatalytic Degradation ◽  
Natural Organic Matter ◽  
Retention Time ◽  
Degradation Rate ◽  
Removal Rate ◽  
Water Source ◽  
Drinking Water Source ◽  
Toc Removal

Ozone-enhanced photocatalytic degradation of macromolecular natural organic matter (NOM) in drinking water source was investigated. The influences of ozone dosage, retention time and bicarbonate concentration on the NOM degradation rate were studied. The change of molecular weight distribution of NOM caused by ozone-enhanced photocatalysis was analysed, as well as the degradation rate of NOM with different molecular weight (MW). It was shown that ozone-enhanced photocatalysis was much better for NOM degradation than sole ozonation or photocatalysis. Increase of both ozone dosage and retention time could effectively increase the TOC removal rate, while biodegradability could be improved solely by an increase in ozone dosage. The existence of bicarbonate significantly reduced the photocatalytic degradation rate of NOM; however, its impact was effectively offset by the addition of ozone into the photocatalytic process. Macromolecular NOM was transformed into smaller molecules, and the larger NOM was mineralized by ozone-enhanced photocatalysis much faster than the smaller NOM.

Chlorination of bisphenol A: Non-targeted screening for the identification of transformation products and assessment of estrogenicity in generated water

Chemosphere ◽  
2013 ◽  
Vol 93 (11) ◽  
pp. 2814-2822 ◽  
Author(s):  
Marc Bourgin ◽  
Emmanuelle Bichon ◽  
Jean-Philippe Antignac ◽  
Fabrice Monteau ◽  
Gaëla Leroy ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Transformation Products ◽  
Targeted Screening

Catalytic ozonation of bisphenol A in aqueous solution using Mn-Ce/HZSM-5 as catalyst

2015 ◽  
Vol 72 (5) ◽  
pp. 696-703 ◽  
Author(s):  
Yanfang Liu ◽  
Junna Zhao ◽  
Zaixing Li ◽  
Guixia Li ◽  
Wei Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Bisphenol A ◽  
Heterogeneous Catalysts ◽  
Butyl Alcohol ◽  
Catalytic Ozonation ◽  
Point Of Zero Charge ◽  
Toc Removal ◽  
Tert Butyl Alcohol ◽  
Bpa Removal

Mixed manganese and cerium oxide supported on HZSM-5 were synthesized and used as heterogeneous catalysts for ozonation of bisphenol A (BPA) in aqueous solution. The prepared catalysts of Mn-Ce/HZSM-5 were characterized by X-ray diffraction, scanning electron microscopy and Fourier transform-infrared spectroscopy. The results indicated that Mn-Ce/HZSM-5 exhibits extraordinary catalytic activity for the degradation of BPA. Removal of 89.3% of BPA and 90.4% of total organic carbon (TOC) was achieved in 30 min, compared to non-catalytic ozonation, where only 50.5% BPA and 28.1% TOC removal were reached under the same conditions. Adsorption of BPA on HZSM-5 support and Mn-Ce/HZSM-5 catalysts was negligible. The strong inhibition of BPA removal by tert-butyl alcohol indicated that the attack of hydroxyl radicals was responsible for the improvement of catalytic ozonation. It was observed that at neutral pH, which is near the point of zero charge of the catalyst, the catalytic activity reached its maximum. Increasing the amount of Mn-Ce/HZSM-5 catalyst until it exceeded 3 g/L did not show a strong effect on BPA removal. The catalysts showed high stability and reusability.

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