DEHP degradation and dechlorination of polyvinyl chloride waste in subcritical water with alkali and ethanol: A comparative study

Chemosphere ◽  
2020 ◽  
Vol 249 ◽  
pp. 126138 ◽  
Author(s):  
Fu-Rong Xiu ◽  
Yongwei Lu ◽  
Yingying Qi
Keyword(s):  
Comparative Study ◽  
Polyvinyl Chloride ◽  
Subcritical Water

Comparative study of normal, micro- & nano-sized iron oxide effect in potentiometric determination of fluconazole in biological fluids

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37957-37963 ◽  
Author(s):  
Lobna A. Hussein ◽  
Amira M. El-Kosasy ◽  
Yossra A. Trabik
Keyword(s):  
Iron Oxide ◽  
Comparative Study ◽  
Polyvinyl Chloride ◽  
Biological Fluids ◽  
Polymeric Matrix ◽  
Potentiometric Determination

Three novel fluconazole (FLU) selective electrodes were investigated with di-octyl phthalate as a plasticizer in a polymeric matrix of polyvinyl chloride and 2-hydroxypropyl-β-cyclodextrin as an ionophore.

Comparative study of the topochemistry on delignification of Japanese beech (Fagus crenata) in subcritical phenol and subcritical water

Holzforschung ◽  
2016 ◽  
Vol 70 (11) ◽  
pp. 1047-1053 ◽  
Author(s):  
Masatsugu Takada ◽  
Yoshiki Tanaka ◽  
Eiji Minami ◽  
Shiro Saka
Keyword(s):  
Comparative Study ◽  
Subcritical Water ◽  
Beech Wood ◽  
Middle Lamella ◽  
Fagus Crenata ◽  
Insoluble Residue ◽  
Residual Lignin ◽  
High Solubility ◽  
Japanese Beech ◽  
Compound Middle Lamella

Abstract The delignification of Japanese beech (Fagus crenata) has been evaluated under conditions of subcritical phenol (230°C/1.2 MPa) and subcritical water (230°C/2.9 MPa). In the former, more than 90% of the original lignin was decomposed and removed, while in subcritical water, around half of the original lignin was left as insoluble residue. Ultraviolet (UV) microscopic images of the insoluble residues showed that the lignin in the secondary walls is decomposed and removed under both conditions. These images also revealed that the lignin in the compound middle lamella (CML) is resistant to subcritical water, but not to subcritical phenol. Results of alkaline nitrobenzene oxidation of the residual lignin confirmed these observations. Lignin in Japanese beech wood was phenolated by subcritical phenol, which was efficiently removed due to its high solubility in the reactant. It is obvious that CML is rich in condensed-type linkages facilitating rapid solvolysis by phenol. The topochemistry of the plant has a pronounced impact on its delignification behavior.

scholarly journals Application of Subcritical Water to Dechlorinate Polyvinyl Chloride Electric Wires

2018 ◽  
Author(s):  
Aurora Soler ◽  
Juan A. Conesa ◽  
Nuria Ortuño
Keyword(s):  
High Pressure ◽  
Polyvinyl Chloride ◽  
Aromatic Hydrocarbons ◽  
Subcritical Water ◽  
Heating Rates ◽  
Chlorinated Pollutants ◽  
Different Temperatures ◽  
Polycyclic Aromatic ◽  
Laboratory Scale Reactor ◽  
Scale Reactor

Polyvinyl chloride (PVC) electric wires were subjected to dechlorination in subcritical water at three different temperatures in a high-pressure reactor. About 2.09, 73.08 and 95.96 wt. % of chlorine in PVC wires was removed during dechlorination at 200, 250 and 300 °C, respectively. The solid residues were analyzed and characterized by thermogravimetry, at three different heating rates (5, 10 and 20 °C/min) in inert and oxidizing atmosphere. With the purpose of studying the emission of chlorinated pollutants, pyrolysis experiments at 850 °C were also performed in a laboratory scale reactor with the dechlorinated materials, as well as with the original PVC electric wire. Polycyclic aromatic hydrocarbons (PAH) formation increased, but chlorobenzenes (ClBz) and chlorophenols (ClPh) formation decreased as the temperature of dechlorination increased; naphthalene was the most abundant PAH and monochlorobenzene and monochlorinated phenols (3-+4-) were the most abundant chlorinated compounds.

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