In this work, we report a systematic study of the relationship between photocatalytic properties of hydrogen evolution and structures and morphologies of g-C 3 N 4 prepared by different precursors (urea, melamine and dicyandiamide). The photocatalytic performances of H 2 production are affected by the method and degree of polymerization, the degree of protonation, and the morphology of g-C 3 N 4 prepared
A strategy was developed to couple
photocatalytic oxidation with
photocatalytic reduction technology to realize one-pot conversion
of MB into hydrocarbons for the first time. In this approach, organic
pollutants were first decomposed into CO2 by photodegradation
and then the as-obtained CO2 was converted into CH3OH, C2H5OH, and CH4 through
photocatalytic reduction of CO2 under solar spectrum irradiation
by using GQDs/V-TiO2 catalysts. The experimental results
show that 5%GQDs/V-TiO2 has the best photocatalytic activity
and the product rates of CH3OH, C2H5OH, and CH4 are 13.24, 5.65, and 0.445 μmol g–1 h–1, respectively. The corresponding
apparent quantum efficiency is 4.87% at 420 nm. The one-pot conversion
of MB into hydrocarbons was demonstrated by a series of experiments.
The photocatalytic mechanisms of one-pot conversion of MB into hydrocarbons
were proposed to explain the detailed photocatalytic process.
Highly porous, three-dimensional (3D) nanostructured composite adsorbents of reduced graphene oxides/Mn3O4 (RGO/Mn3O4) were fabricated by a facile method of a combination of reflux condensation and solvothermal reactions and systemically characterized. The as-prepared RGO/Mn3O4 possesses a mesoporous 3D structure, in which Mn3O4 nanoparticles are uniformly deposited on the surface of the reduced graphene oxide. The adsorption properties of RGO/Mn3O4 to antimonite (Sb(III)) and antimonate (Sb(V)) were investigated using batch experiments of adsorption isotherms and kinetics. Experimental results show that the RGO/Mn3O4 composite has fast liquid transport and superior adsorption capacity toward antimony (Sb) species in comparison to six recent adsorbents reported in the literature and summarized in a table in this paper. Theoretical maximum adsorption capacities of RGO/Mn3O4 toward Sb(III) and Sb(V) are 151.84 and 105.50 mg/g, respectively, modeled by Langmuir isotherms. The application of RGO/Mn3O4 was demonstrated by using drinking water spiked with Sb (320 μg/L). Fixed-bed column adsorption experiments indicate that the effective breakthrough volumes were 859 and 633 mL bed volumes (BVs) for the Sb(III) and Sb(V), respectively, until the maximum contaminant level of 5 ppb was reached, which is below the maximum limits allowed in drinking water according to the most stringent regulations. The advantages of being nontoxic, highly stable, and resistant to acid and alkali and having high adsorption capacity toward Sb(III) and Sb(V) confirm the great potential application of RGO/Mn3O4 in Sb-spiked water treatment.
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