Efficient photodegradation of methylthioninium chloride dye in aqueous using barium tungstate nanoparticles

Alshehri, Saad M.; Ahmed, Jahangeer; Ahamad, Tansir; Al-Maswari, Basheer M.; Khan, Aslam

doi:10.1007/s11051-017-3970-z

Cited by 31 publications

(12 citation statements)

References 69 publications

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“…Finally, *OH, *O 2 − , 1 O 2 , and h + directly participate the photocatalytic degradation reaction to decompose contaminants, and even mineralized them into CO 2 and H 2 O (Equation ). [ 52–54 ] To sum up, a Z‐scheme was built after Bi 2 O 3 nanoparticles were decorated on the surface of N‐TiO 2 , which could efficiently accelerate the separation and transfer of photogenerated pairs and improve the photocatalytic activity.

\begin{matrix} Photocatalyst + h υ \to {normalh}^{+} + {normale}_{}^{-} \end{matrix}

\begin{matrix} {normale}^{-} + {normalO}_{2} \to_{}^{*} {normalO}_{2}^{-} \end{matrix}

\begin{matrix} _{}^{*} {normalO}_{2}^{-} \to_{}^{1} {normalO}_{2} \end{matrix}

\begin{matrix} {normalh}^{+} + {normalH}_{2} O \to_{}^{*} OH \end{matrix}

\begin{matrix} \begin{matrix} left \\ ^{*} {OH/}^{*} {normalO}_{2}^{-} {normal/}^{1} {normalO}_{2} {/h}^{+} + contaminants \to oxidation products \\ \to {CO}_{2} + {normalH}_{2} O \end{matrix} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

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Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi₂O₃@N‐TiO₂ Z‐Scheme Photocatalytic System

Zhou

Wang

Zhang

et al. 2022

Advanced Sustainable Systems

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Fiber‐based microplastic (FMP) pollution in the wastewater of the textile industry and urban sewage has become an emerging issue and a potential threat to marine life and human health. However, most reported reduction strategies, such as physical adsorption/filtration and chemical‐catalytic degradation are limited by the secondary pollution caused by the desorption of FMPs and inferior degradation performance. Advanced technologies for efficient FMP control remain largely insufficient and underdeveloped. This work reports a Z‐scheme Bi2O3@N‐TiO2 heterojunction synthesized by a solvothermal and wet‐impregnation strategy. Bi2O3@N‐TiO2 degrades ≈10.23 ± 1.91 wt% of polyethylene terephthalate (PET)‐FMPs (a major FMP existing in the environment) at pH = 9, which is nearly three times higher than that at pH = 7. Experimental results show that the hydrolysis of PET‐FMPs in alkaline media is the main reason for the superior performance. Importantly, the hydrophilic, weight‐average molecular weight and crystallinity of PET‐FMP are the key factors affecting the photocatalytic degradation performance of PET‐FMPs. This study demonstrates an eco‐friendly strategy for remediation of FMP contamination.

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\begin{matrix} Photocatalyst + h υ \to {normalh}^{+} + {normale}_{}^{-} \end{matrix}

\begin{matrix} {normale}^{-} + {normalO}_{2} \to_{}^{*} {normalO}_{2}^{-} \end{matrix}

\begin{matrix} _{}^{*} {normalO}_{2}^{-} \to_{}^{1} {normalO}_{2} \end{matrix}

\begin{matrix} {normalh}^{+} + {normalH}_{2} O \to_{}^{*} OH \end{matrix}

\begin{matrix} \begin{matrix} left \\ ^{*} {OH/}^{*} {normalO}_{2}^{-} {normal/}^{1} {normalO}_{2} {/h}^{+} + contaminants \to oxidation products \\ \to {CO}_{2} + {normalH}_{2} O \end{matrix} \end{matrix}

…”

Section: Resultsmentioning

confidence: 99%

“…Finally, *OH, *O 2 − , 1 O 2 , and h + directly participate the photocatalytic degradation reaction to decompose contaminants, and even mineralized them into CO 2 and H 2 O (Equation 5). [52][53][54] To sum up, a Z-scheme was built after Bi 2 O 3 nanoparticles were decorated on the surface of N-TiO 2 , which could efficiently (2)…”

mentioning

confidence: 99%

Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi₂O₃@N‐TiO₂ Z‐Scheme Photocatalytic System

Zhou

Wang

Zhang

et al. 2022

Advanced Sustainable Systems

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“…The obtained SEM images clearly showed the flower-like structure, which was oriented together with numerous nanospindles. Nevertheless, in comparison to pure BaWO 4 (Figure a–c), rare-earth metal doping affects the size of BaWO 4 , which facilitated more active sites to contribute in the electrocatalytic reaction . The optimum amount of the doping agent tuned the morphology of the material, while the high concentration of the doping agent affects the morphology of the material.…”

Section: Resultsmentioning

confidence: 98%

Neodymium-Doped Novel Barium Tungstate Nanospindles for the Enhanced Oxygen Evolution Reaction

et al. 2023

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In this work, pristine, 0.02, 0.04, and 0.06 M neodymium (Nd)-doped barium tungstate nanostructures were synthesized via a simple co-precipitation method for the water oxidation process. The obtained X-ray diffraction high-intensity peak at a 2θ value of 26.4°corresponding to the (112) lattice plane confirmed the formation of a tetragonal structure of BaWO 4 . Moreover, the BaWO 4 morphology was examined by scanning electron microscopy, which showed the existence of nanospindles. An energydispersive X-ray spectrum confirmed the subsistence of the produced materials, for example, barium (Ba), tungsten (W), oxide (O), and neodymium (Nd), with weight percentages of 28.58, 46.63, 16.64, and 8.16%, respectively. The 0.04 M Nd-doped BaWO 4 product was explored to attain a high surface area of 18.18 m 2 /g, a pore volume of 0.079 cm 3 /g, and a pore diameter of 2.215 nm. Compared to the other prepared electrodes, the 0.04 M Nd-doped BaWO 4 product exhibited low overpotential values of 330 mV and 450 mV to deliver current densities of 10 mA/cm 2 and 50 mA/ cm 2 , respectively. In addition, the optimized electrode achieved a small Tafel slope value of 158 mV dec −1 and followed the Volmer− Heyrovsky mechanism. Moreover, the electrical conductivity of BaWO 4 was tuned due to the addition of a rare-earth metal dopant, and it exhibited the charge-transfer resistance and solution resistance values of 0.98 and 1.01 Ω, respectively. The prepared electrocatalyst was further studied by using cyclic voltammetry, and it exhibited a high double-layer capacitance value of 29.3 mF/ cm 2 and high electrochemically active surface areas of 1.465 cm 2 . The electrochemical performance was greatly improved depending on the concentration of the doping agent, and it was well consistent with the obtained results. The best electrocatalyst was subjected to a chronoamperometry test, which exhibited excellent stability even after 20 h. Hence, this work suggests that alkaline metal tungstates have a cost-effective, efficient, and promising electrocatalyst, and it is a new approach for the water oxidation process.

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“…RE 3+ 3d spectra were observed with RE 3+ -doped BaWO 4 samples as shown in Figure 6 b–d. Dy 3+ 3d spectra were observed at about 1297 and 1340 eV, Tb 3+ 3d spectra were observed at about 1241 and 1275 eV, and Sm 3+ 3d spectra were observed at about 1082 and 1110 eV, which can be assigned to RE 3+ 3d 5/2 and 3d 3/2 states based on Dy–O, Tb–O, and Sm–O bonding [ 48 ]. The RE ions can be evaluated oxidation state as +3.…”

Section: Resultsmentioning

confidence: 99%

Structure and Photoluminescence Properties of Rare-Earth (Dy3+, Tb3+, Sm3+)-Doped BaWO4 Phosphors Synthesized via Co-Precipitation for Anti-Counterfeiting

et al. 2020

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Barium tungstate (BaWO4) powders with various sintering temperatures, and BaWO4:Dy3+ phosphor samples with concentrations of different rare-earth (RE) activator ions (Dy3+, Sm3+, Tb3+) were prepared through co-precipitation. The structural, morphological, and photoluminescent characteristics of barium tungstate phosphors depend on the concentration of RE ions. The crystallographic characteristics of the synthesized BaWO4 were analyzed using X-ray diffraction (XRD) patterns. The size and shape of the crystalline particles were estimated based on images measured with a field emission scanning electron microscope (FE-SEM). As the sintering temperature of the BaWO4 particles increased from 400 °C to 1000 °C, the size of the particles gradually increased and showed a tendency to clump together. In the sample doped with 7 mol % Dy3+ ions, the intensity of all emission bands reached their maximum. The emission spectra of the RE3+-doped BaWO4 powders by excitation at 325 nm were composed of yellow (Dy3+), red (Sm3+), and green (Tb3+) band at 572, 640, and 544 nm. This indicates that most of the RE3+ ions absorbed the position without reversal symmetry in the BaWO4 lattice. These results propose that strong emission intensity and tunable color for the phosphors can be accomplished by rare-earth doped host with an suitable quantity. In addition, the phosphor thin films, having high transparency from aqueous colloidal solutions, were deposited on banknotes, and it is considered whether it is suitable for anti-counterfeiting applications.

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Efficient photodegradation of methylthioninium chloride dye in aqueous using barium tungstate nanoparticles

Cited by 31 publications

References 69 publications

Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi₂O₃@N‐TiO₂ Z‐Scheme Photocatalytic System

Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi₂O₃@N‐TiO₂ Z‐Scheme Photocatalytic System

Neodymium-Doped Novel Barium Tungstate Nanospindles for the Enhanced Oxygen Evolution Reaction

Structure and Photoluminescence Properties of Rare-Earth (Dy3+, Tb3+, Sm3+)-Doped BaWO4 Phosphors Synthesized via Co-Precipitation for Anti-Counterfeiting

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Efficient photodegradation of methylthioninium chloride dye in aqueous using barium tungstate nanoparticles

Cited by 31 publications

References 69 publications

Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi2O3@N‐TiO2 Z‐Scheme Photocatalytic System

Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi2O3@N‐TiO2 Z‐Scheme Photocatalytic System

Neodymium-Doped Novel Barium Tungstate Nanospindles for the Enhanced Oxygen Evolution Reaction

Structure and Photoluminescence Properties of Rare-Earth (Dy3+, Tb3+, Sm3+)-Doped BaWO4 Phosphors Synthesized via Co-Precipitation for Anti-Counterfeiting

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Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi₂O₃@N‐TiO₂ Z‐Scheme Photocatalytic System

Feasible Degradation of Polyethylene Terephthalate Fiber‐Based Microplastics in Alkaline Media with Bi₂O₃@N‐TiO₂ Z‐Scheme Photocatalytic System