Enhanced photocatalytic oxidation of SO2 on TiO2 surface by Na2CO3 modification

Wang, Haiming; You, Changfu; Tan, Zhongchao

doi:10.1016/j.cej.2018.05.128

Cited by 36 publications

(16 citation statements)

References 57 publications

(54 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After affirming the role of dissolved oxygen, we then investigate the reactive oxygen species (ROS) with ROS scavengers, including ascorbic acid for all the ROS, thiourea, and NaN 3 as well as Na 2 CO 3 that serve as scavengers of ·OH, 1 O 2 , and –• O 2 , − respectively (Figures S6–S9). Only ascorbic acid and thiourea are in a position to quench the cascade chromogenic reaction.…”

Section: Results and Discussionmentioning

confidence: 99%

Cascade Chromogenic System with Exponential Signal Amplification for Visual Colorimetric Detection of Acetone

Liang

Wang

et al. 2020

Anal. Chem.

View full text Add to dashboard Cite

The signal of the traditional chromogenic systems is directly proportional to analyte concentration, leading to an unsatisfactory sensitivity. Herein, we report a cascade chromogenic system to realize exponential amplification of colorimetric signal through coupling chemical oxidation with photoinduced radical chain reaction. The chemical oxidation of o-phenylenediamine (OPD) by Fe3+ generates Fe2+ and photoactive 2,3-diaminophenazine (DAP). Under blue-light irradiation, DAP initiates the formation of holes and H2O2 that reacts with Fe2+ to hydroxyl radicals (·OH) and Fe3+ via an intersystem crossing (ISC) process. Moreover, the holes oxidize water to yield ·OH as well. The resulting ·OH and regenerated Fe3+ in turn oxidize OPD to yield more DAP, leading to a self-propagating reaction cycle that continues to proceed until all the OPD molecules are consumed, along with a distinct color change from colorless to yellow. Through the generation of the complex between DAP and acetone that limits the ISC process, and therefore quenches the colorimetric signal, the highly sensitive and selective naked-eye detection of acetone is achieved from 50 μM to 3 mM, with a limit of detection of 35 μM. Additionally, the feasibility of this colorimetric assay to detect acetone in real water samples is also demonstrated.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Cascade Chromogenic System with Exponential Signal Amplification for Visual Colorimetric Detection of Acetone

Liang

Wang

et al. 2020

Anal. Chem.

View full text Add to dashboard Cite

show abstract

“…As expected, a clear four-line spectrum with ap eaks intensityr atio of 1:2:2:1 (g = 2.001, aH = aN = 1.50 mT) was observed under the irradiation of simulated sunlight (AM 1.5 G), and the intensity of the corresponding signal of DMPO-COH adduct increased along with the irradiation time, confirming the generation of hydroxyl radicals by TA-BGY under sunlight irradiation. [16] It has been well reportedt hat hydroxyl radicalp ossessesc an breakd own dye compounds. [17] Subsequently,t he oxidative ability of TA-BGY as ap hotocatalyst was examined through photodegradation of an azo dye-methyl orange (MO), which was widely used in industries of textile, leather,f ood, and cosmetics, and, therefore, frequently found in waste water.…”

Section: Resultsmentioning

confidence: 99%

A Triazine‐Based Analogue of Graphyne: Scalable Synthesis and Applications in Photocatalytic Dye Degradation and Bacterial Inactivation

Chen

et al. 2020

Chemistry A European J

View full text Add to dashboard Cite

Graphyne, a theorized carbon allotrope possessing only sp‐ and sp2‐hybridized carbon atoms, holds great potentials in many fields, especially in catalysis and energy‐transfer/storage devices. Using a bottom‐up strategy, we synthesized a new N‐doped graphyne analogue, triazine‐ and 1,4‐diethynylbenzene‐based graphyne TA‐BGY, in solution in gram‐scale. The unique sp/sp2 carbon‐conjugated TA‐BGY possesses an extended porous network structure with a BET surface area of approximately 300 m2 g−1. Owing to its low optical band gap (1.44 eV), TA‐BGY was expected to have many applications, which were exemplified by the photodegradation of methyl orange and photocatalytic bacterial inactivation.

show abstract

“…However, element admixture increases the cost and is impractical for large-scale application in the construction industry. In addition, while many studies investigated the degradation of SO 2 , they mainly used only NT as a photocatalyst, or NT coated on limestone [38], Teflon plates, glass fiber filters, nanofibers [39], or glass beads [40,41]. These yielded catalysts totally unlike building materials, such as mortar containing intermixed high-porosity alkaline CPs, as in this research.…”

Section: Resultsmentioning

confidence: 99%

Sulfur Dioxide Degradation by Composite Photocatalysts Prepared by Recycled Fine Aggregates and Nanoscale Titanium Dioxide

Chen

Kou

2019

Nanomaterials

View full text Add to dashboard Cite

To alleviate the heavy burden on landfilling, construction and demolition wastes (C&DWs) are recycled and reused as aggregates in cementitious materials. However, the inherent characteristics of recycled fine aggregates (RFA), such as the high crushing index and high-water absorption, magnify the reusing difficulty. Nevertheless, attributing to the high porosity and high level of calcium hydroxides existing in the old mortar, RFA is featured with a high specific surface area and a high alkalinity. These features are useful to augment the total photo-degradation of SO2 by nano-TiO2 (NT) intermixed mortar, leading RFA to be an excellent potential carrier to load nano-TiO2 and prepare the composite photocatalyst. Hence, this study proposed to load NT onto the surface of RFAs and river sands (RSs) (the control) by the soaking method, preparing composite photocatalysts denoted as NT@RFA and NT@RS, respectively. The prepared composite photocatalysts were then utilized as sands in photocatalytic mortar to evaluate for SO2 degradation. Experiments identified a 50% higher amount of NT was loaded onto the surface of FRA relative to the control. This higher loading amount plus higher alkalinity ultimately translated into a higher photocatalytic activity. In addition, the mortar containing NT@RFA exhibited 46.3% higher physiochemical absorption and 23.9% higher photocatalytic activity than that containing NT@RS. In addition, the durability, embodied by the reuse and anti-abrasive properties, of NT@RFA exceeded that of NT@RS. The overall findings reveal that the NT@RFA not only garners beneficial effect from the high porosity but also generates positive effect from the high alkalinity. Though a number of studies deal with building materials with NT, this study is the first to load NT onto RFA and prepare composite photocatalysts which were then used as fine aggregates in building materials. Consequently, this study proves the potential high-added-value reusability of RFA in green construction materials and provides a low-cost, high-efficiency approach to degrade atmospheric SO2.

show abstract

Enhanced photocatalytic oxidation of SO2 on TiO2 surface by Na2CO3 modification

Cited by 36 publications

References 57 publications

Cascade Chromogenic System with Exponential Signal Amplification for Visual Colorimetric Detection of Acetone

Cascade Chromogenic System with Exponential Signal Amplification for Visual Colorimetric Detection of Acetone

A Triazine‐Based Analogue of Graphyne: Scalable Synthesis and Applications in Photocatalytic Dye Degradation and Bacterial Inactivation

Sulfur Dioxide Degradation by Composite Photocatalysts Prepared by Recycled Fine Aggregates and Nanoscale Titanium Dioxide

Contact Info

Product

Resources

About