Controlled hydrothermal synthesis of BiOxCly/BiOmBrn/g-C3N4 composites exhibiting visible-light photocatalytic activity
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Photodegradation
Graphitic carbon nitride
Visible spectrum
Scavenger
Bismuth
Hydrothermal Synthesis
Physical aspects of the photodegradation of polymers. Photochemical aspects of degradation of polymers. Photodegradation and photo-oxidative degradation of homochain polymers. Photodegradation and photo-oxidative degradation of heterochain polymers. Role of metal compounds in the photodegradation of polymers. Degradation of polymers initiated by radicals formed from photolysis of different compounds. Degradation of polymers by oxygen reactive species formed from photoreactions of oxygen. Photodegradable polymers. Photodegradation of polymers in extreme conditions. Experimental methods in polymer degradation. References. Index.
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The photodegradation of pesticides was investigated on adsorbed phases: silica, kaolin, bentonite and on a standard soil. Kinetic results show that the photodegradation of phenmedipham is dependant on the nature of the support. On silica and bentonite the degradation is immediate while the photodegradation is slow on kaolin and standard soil. Also, the nature of the photodegradation depends on the reactional mechanism on the support.
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Photodegradation of Polycyclic Aromatic Hydrocarbons (PAHs) is a main environmental behavior and plays an important role in the fate of PAHs in environment.In order to understand the photodegradation law of Polycyclic Aromatic Hydrocarbons(PAHs)in soil, aeolian sand in blow-sand region of Northern Shaanxi was chosen as typical soil and phenanthrene (Phe) as typical pollutant of PAHs.Photodegradation law of Phe on soil surface was simulated.In addition, effects of initial Phe concentration, light intensity, time and pH on photodegradation of Phe in aeolian sand was assessed.Results show that the photodegradation of Phe followed pseudo first-order kinetics.Photodegradation rate constant of Phe increased with the increasing of irradiation intensity which the order was as followed: 125W>100W>75W>50W.Irradiation intensity enhances photodegradation of PAHs on soil surfaces.Photodegradation half-life of Phe ranged from 2.474 hours to 3.095 hours under different irradiation intensity.Degradation rate increases as pH increase and photodegradation is more rapid in alkaline medium.Photodegradation rate is the lowest as initial concentration is the largest.
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This chapter contains sections titled: Introduction to Bismuth Coordination Polymers Bismuth(III) Complexes with Monoaminopoly Carboxylate Bismuth(III) Complexes with Diaminopolycarboxylate Ligands Bismuth Complexes with Polyaminopolycarboxylate Ligands Applications Nano Bismuth(III) Coordination Polymers Conclusion
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Polycyclic aromatic hydrocarbons (PAHs) are a group of major contaminants that are ubiquitous in the environment due to their toxicity, mutagenicity and carcinogenicity. This paper studied the soil borne PAHs photodegradation under UV irradiation with phenanthrene(Phe) as target contaminants. The effects of temperature,humic acids(HA)and the intensity of UV irradiation on the Phe photodegradation were investigated. The dynamics of photodegradation of Phe were studied under different conditions. The results show that the rate of Phe photodegradation increases when the temperature rises from 20 ℃ to 30 ℃. The HA played a sensitivizing role during the Phe photodegradation. When the HA concentration was 5 mg·kg-1, HA could efficiently sensitivize the Phe photodegradation. The rate of photodegradation decreases with the decreasing UV irradiation intensity, correlated positively. The half-life increases with the decreasing UV irradiation intensity, correlated negatively.
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The photodegradation of pesticides was investigated on adsorbed phases: silica, kaolin, bentonite and on a standard soil. Kinetic results show that the photodegradation of phenmedipham is dependant on the nature of the support. On silica and bentonite the degradation is immediate while the photodegradation is slow on kaolin and standard soil. Also, the nature of the photodegradation depends on the reactional mechanism on the support.
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Polyetherimide
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Methyl orange
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Abstract Enhancement of the photodegradation of bisphenol A (BPA) by β‐cyclodextrin (β‐CD) was investigated under a 30 W UV disinfection lamp (λ max = 254 nm). The photodegradation rate of BPA in aqueous solutions with β‐CD was faster than that in aqueous solutions without β‐CD; for example, after 50 min of UV irradiation, β‐CD had increased the photodegradation efficiency by about 46.5% for 10 mg dm −3 BPA. The photodegradation of 2.5–20 mg dm −3 BPA in aqueous solutions was found to follow pseudo‐first‐order kinetics. The first‐order rate constant showed a 12‐fold increase in the presence of β‐CD. Factors such as β‐CD concentration, pH, BPA initial concentration and organic solvent influencing the photodegradation of BPA were studied and are described in detail. Variations in the pH and electrical conductivity of solutions were observed during the photodegradation process. The enhancement of photodegradation of BPA results mainly from the lower bond energy between some atoms in the BPA molecule after inclusion interaction with β‐CD. Copyright © 2006 Society of Chemical Industry
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