A Strategy for One-Pot Conversion of Organic Pollutants into Useful Hydrocarbons through Coupling Photodegradation of MB with Photoreduction of CO₂

Abstract

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.

Visible‐Light‐Triggered Quantitative Oxidation of 9,10‐Dihydroanthracene to Anthraquinone by O2 under Mild Conditions

“…Hydroxyl (COH) and superoxide (O 2 À C)f ree radicals as well as holes (h + )a re generally recognized as three active species in the O 2 -based selectiveo xidation, and the quenching experiments for these three active oxygen speciesw erec onducted by adding 0.2 mM TEMPO (a quencher of COH and O 2 À C), IPA( a quencher of COH), BQ (a quencher of O 2 À C), and Na 2 C 2 O 4 (a quencher of h + ), respectively. [45] As showni nF igure3,t he photo-oxidation of DHA to AQ is almost completely quenched in the presenceo fT EMPO and decelerated significantly in the presence of BQ, but is almostu naffected by the quenchers IPA and Na 2 C 2 O 4 .T he quenching experimentsu ndoubtedly suggest that O 2 À C is the main active species for the current photooxidation protocol.…”

“…OH), BQ (a quencher of O 2 −. ), and Na 2 C 2 O 4 (a quencher of h + ), respectively . As shown in Figure , the photo‐oxidation of DHA to AQ is almost completely quenched in the presence of TEMPO and decelerated significantly in the presence of BQ, but is almost unaffected by the quenchers IPA and Na 2 C 2 O 4 .…”

Metal-organic frameworks for electrochemical reduction of carbon dioxide: The role of metal centers

“…In the long-term, however, energy efficiency and renewable will become a crucial part of the energy supply and use, which will effectively reduce the CO 2 emission. One promising measure is the development of CO 2 capture and conversion, including biomass, physical, and chemical solutions [8][9][10][11] . Nevertheless, CO 2 capture not only consumes a lot of energy and costs, but also is easy to reach the capacity limits [5] .…”

Synthesis of a Highly Active and Stable Pt/Co3O4 Catalyst and Its Application for the Catalytic Combustion of Toluene

“…To eliminate the emissions of VOCs, many researchers have tried hard to develop the VOCs abatement technologies, such as thermal burning, absorption, photocatalytic degradation and catalytic combustion . Among those VOCs abatement technologies, catalytic combustion technology has caused so much attention due to its high efficiency, economic feasibility, and eco‐friendliness …”