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1.
Waste Manag Res ; 41(4): 839-847, 2023 Apr.
Article in English | MEDLINE | ID: mdl-36382767

ABSTRACT

The treatment of used vegetable oil (UVO) with seven different adsorbents and through two different procedures (stirring and gravity filtration) was explored. Important differences in terms of density, turbidity, electrical resistance, free fatty acids (FFAs) content and relative fatty acid distribution were observed. Different outcomes were shown depending both on the adsorbent and on the procedure. Lower values of density and FFAs were registered for oils treated by gravity filtration with portland (respectively 0.6% and 0.81 g/ml) and celite (respectively 0.7% and 0.72 g/ml). Considering the undesired leaching from the powder to the oil, related to the turbidity, the celite resulted more suitable for the oil recycling (241 Nephelometric Turbidity Unit (NTU) for portland vs 184 NTU for celite). In addition, Fourier-transform infrared spectroscopy combined with multivariate analysis allowed to determine a chemical fingerprint relative characteristic of vegetable oils recycled by gravity or by adsorption by stirring.


Subject(s)
Diatomaceous Earth , Plant Oils , Plant Oils/chemistry , Powders , Adsorption , Fatty Acids/analysis , Spectroscopy, Fourier Transform Infrared
2.
Water Environ Res ; 91(2): 165-174, 2019 Feb.
Article in English | MEDLINE | ID: mdl-30735300

ABSTRACT

Clay material is used as a catalyst to degrade an organic pollutant. This study focused on the O-cresol oxidative degradation in aqueous solution by adding H2 O2 and Mont-Na. The catalytic tests showed a high catalytic activity of Mont-Na, which made it possible to achieve more than 84.6% conversion after 90 min of reaction time at 55°C in 23.2 mM H2 O2 . The pH value was found to be negatively correlated with the degradation rate of O-cresol. UV-Vis spectrophotometry revealed that the increase of degradation rate at low pH is related to the formation of 2-methylbenzoquinone as intermediate product. In addition, the content of iron in Mont-Na decreased after the catalytic test, bringing further evidence about the O-cresol catalytic oxidation. The mineralization of O-cresol is also confirmed by the different methods of characterization of Mont-Na after the catalytic oxidation test. The effect of the O-cresol oxidation catalyzed by natural clay is significant. PRACTITIONER POINTS: Algerian Montmorillonite-Na is used as a catalyst to degrade an organic pollutant: O-cresol. It shows a great potential for catalyst properties in the presence of the oxidizing reagent H2 O2 . It proved to be an effective means for the degradation of O-cresol contained in wastewaters.


Subject(s)
Clay/chemistry , Cresols/chemistry , Environmental Pollutants/chemistry , Hydrogen Peroxide/chemistry , Sodium/chemistry , Adsorption , Catalysis , Cresols/isolation & purification , Environmental Pollutants/isolation & purification , Hydrogen-Ion Concentration , Kinetics , Temperature , Water/chemistry
3.
Nat Prod Commun ; 6(10): 1445-6, 2011 Oct.
Article in English | MEDLINE | ID: mdl-22164778

ABSTRACT

Urolithiasis can lead to the loss of renal function in some cases. In this study, we tested the inhibiting effect of wheat bran (Triticum aestivum L) extract on calcium oxalate crystallization in a turbidimetric model, by FTIR spectroscopy, and polarized microscopy. The results show that this plant extract has a major inhibitory effect on calcium oxalate crystallization.


Subject(s)
Calcium Oxalate/chemistry , Crystallization , Dietary Fiber/analysis , Plant Extracts/pharmacology , Triticum/chemistry , Plant Extracts/chemistry , Spectrophotometry
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