New insight into monitoring degradation products during the TiO2-photocatalysis process by multivariate molecular spectroscopy

Stets, Sandra; Amaral, Bianca do; Bach, Larissa; Nagata, Noemi; Peralta‐Zamora, Patricio

doi:10.1007/s11356-016-7232-x

Cited by 3 publications

(4 citation statements)

References 29 publications

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“…UV measurements from the magnetic stirrer and tergotometer tests were obtained and the results showed that peak absorbance occurred in the same wavelengths (220–225 nm) (for more details see Figure and Section ). Since chemicals only absorb very specific wavelengths of light, these results confirm that the main mechanism that leads to the increase in the absorbance should be dissolution …”

Section: Resultssupporting

confidence: 56%

“…Since chemicals only absorb very specific wavelengths of light, these results confirm that the main mechanism that leads to the increase in the absorbance should be dissolution. 40 Upon a further increase of the upstream pressure from 0.345 to 0.620 MPa, despite the reduction in the time of the advective mass transport, a notable jump (11.07% with respect to 0.345 MPa) in the peak absorbance can be recognized. Since a pressure of 0.620 MPa triggers the cavitation inception pressure in reactor I for this solution (Figure 2a(i)), it can be deduced that the cavitation has a positive impact on the dissolution of the liquid detergent.…”

Section: Resultsmentioning

confidence: 97%

“…Since chemicals only absorb very specific wavelengths of light, these results confirm that the main mechanism that leads to the increase in the absorbance should be dissolution. 40 …”

Section: Resultsmentioning

confidence: 99%

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Detergent Dissolution Intensification via Energy-Efficient Hydrodynamic Cavitation Reactors

et al. 2023

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In this study, we explored the potential of hydrodynamic cavitation (HC) for use in dissolution of liquid and powder detergents. For this, microfluidic and polyether ether ketone (PEEK) tube HC reactors with different configurations were employed, and the results from the reactors were compared with a magnetic stirrer, as well as a tergotometer. According to our results PEEK tube HC reactors present the best performance for dissolution of liquid and powder detergents. In the case of liquid detergent, for the same level of initial concentration and comparable final dissolution, the PEEK tube consumed 16.7 and 70% of the energy and time of a tergotometer and 16.7 and 14.8% of that of a magnetic stirrer, respectively. In the case of powder detergent, the PEEK tube used 12% less power than a tergotometer and 81.2% less power than a magnetic stirrer. Additionally, the time required to dissolve the detergent was reduced significantly from 1200 s in the tergotometer and 1800 s in the magnetic stirrer to just 50 s in the PEEK tube. These results suggest that HC could significantly improve the dissolution rate of liquid and powder detergents and energy consumption in washing machines.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 97%

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Detergent Dissolution Intensification via Energy-Efficient Hydrodynamic Cavitation Reactors

et al. 2023

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“…The degradation of phenol was preliminary monitored by UV-Vis spectroscopy in a Varian Cary-50 spectrophotometer, by measuring the absorbance at 270 nm and the spectral area integrated between 200 and 350 nm. Phenol and its byproducts were determined with liquid chromatography (HPLC) using water and acetonitrile as solvents, a C18 column and a diode-array detector, as priorly determined by Stets et al 29 The chemical oxygen demand (COD) was measured with UV-Vis spectrophotometry, according to the APHA 5220D Standard Method. 30 Calibration curves were elaborated with standard potassium biphthalate for a COD level ranging from 100 to 800 mg O 2 L -1 .…”

Section: Analytical Controlmentioning

confidence: 99%

Advanced Oxidation Processes to the Remediation of Liquid Residue from the Thermal Treatment of Oily Sludge

Costa¹,

Althoff²,

Schneider³

et al. 2019

J. Braz. Chem. Soc.

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This work reports the remediation of a liquid residue derived from the thermal treatment of petrochemical residues by advanced oxidation processes. Firstly, degradation studies of phenol aqueous solutions by heterogeneous photocatalysis, Fenton, and photo-Fenton were conducted. Fenton processes showed a higher efficiency, mainly in the UVA photo-assisted mode (94% in 3 min), and henceforward it was chosen for the remediation of the residue. However, the high organic load of the raw residue (6,000 mg L-1 of chemical oxygen demand (COD)) limited the efficiency of the Fenton processes. Hence, the raw liquid residue was diluted with the scrubber residue, produced during the thermal treatment of the petrochemical residues, reducing the COD to values close to 2,000 mg L-1. The photo-Fenton treatment allowed the removal of approximately 95% of the COD load, decreasing the residual concentration of phenolic compounds from 213 to 0.5 mg L-1. At the same time, the concentration of BTEXs (benzene, toluene, ethylbenzene and xylene) were reduced to values lower than the limit of quantification (LOQ) of the chromatographic technique. Therefore, the photo-Fenton process is an efficient alternative to the remediation of residues with high complexity and with high COD values, like the ones obtained in the petrochemical industry.

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Electrochemical Oxidation of Phenol Released from Spent Coordination Polymer Impregnated with Ionic Liquid

Plesu,

Maranescu,

Tara-Lunga Mihali

et al. 2023

J. Compos. Sci.

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Coordination polymer (CP)-type adsorbents impregnated with ionic liquids that are used to remove phenol from wastewater must be regenerated. A simple washing of the adsorbent releases about 70% from the spent adsorbent. In order to increase and study the phenol release, an electrochemical method was used. For this purpose, an electrochemical commercial graphite electrode was used as the working electrode, and the electrolyte support was a 3% NaCl solution. During the electrochemical investigation, the spent CP was immersed in a saline solution. The PH content in the electrolyte affected the direct electrooxidation (EO); the formation of BQ appeared to be accelerated by a lower concentration and a slower release of PH. After 90 min, an efficiency of PH electrooxidation (EOPH) of 36.22% from Cu-PA and EOPH of 42.14% from Cu-PA-IL, respectively, was achieved. These results were significantly higher than the EOPH of the solution resulting from washing the wasted adsorbent with a saline solution (22.58%). This work highlights the potential for the simultaneous electrooxidation of desorbed PH and the recovery of spent adsorbent in this situation. The number of cycles in which the adsorbent can be used without losing its absorbance ability is three.

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New insight into monitoring degradation products during the TiO2-photocatalysis process by multivariate molecular spectroscopy

Cited by 3 publications

References 29 publications

Detergent Dissolution Intensification via Energy-Efficient Hydrodynamic Cavitation Reactors

Detergent Dissolution Intensification via Energy-Efficient Hydrodynamic Cavitation Reactors

Advanced Oxidation Processes to the Remediation of Liquid Residue from the Thermal Treatment of Oily Sludge

Electrochemical Oxidation of Phenol Released from Spent Coordination Polymer Impregnated with Ionic Liquid

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