Silicon dioxide quantum dots anchored on the surface of carbon nanodiscs as photoluminescent probe for Cr(VI) detection

Cilamkoti, Vatsala; Dutta, Ruma

doi:10.1016/j.jphotochem.2022.114406

Cited by 12 publications

(2 citation statements)

References 64 publications

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“…As shown in Figure , the XRD exhibits a broad and strong peak at 2θ = 18.2°, which is the contribution of amorphous silicon. , …”

Section: Results and Discussionmentioning

confidence: 90%

“…As shown in Figure 3, the XRD exhibits a broad and strong peak at 2θ = 18.2°, which is the contribution of amorphous silicon. 30,31 Rheological Property Analysis. To optimize the concentration of S-SiQDs, the viscosities of the HPAM/S-SiQDs hybrid solution with different concentrations of S-SiQDs were measured under a constant shear rate of 7.34 s −1 .…”

Section: ■ Experimental Partmentioning

confidence: 99%

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Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM

Zhao,

Li,

Dai

et al. 2024

Langmuir

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Hydrolyzed polyacrylamide (HPAM) is commonly used in polymer flooding, however, it is prone to viscosity reduction at high temperatures and high salinities, weakening its ability to improve oil recovery. In this work, sulfonated modified silicon quantum dots (S-SiQDs) were synthesized and then added to HPAM to study the improvement of rheological properties and enhanced oil recovery performance of HPAM at high temperatures and salinities. It is found that the S-SiQDs with a concentration of only 0.1 wt % can significantly increase the viscosity of HPAM from 28.5 to 39.6 mPa•s at 60 °C and 10,000 mg/L NaCl. Meanwhile, the HPAM/S-SiQDs hybrid solution always possessed higher viscosity and viscoelastic moduli than HPAM, attributed to the hydrogen bonding between HPAM and S-SiQDs. Notably, HPAM/S-SiQDs still maintained elastic behavior at harsh conditions, indicating that they formed a strong network structure. Through oil displacement experiments, it was found that the oil recovery of HPAM/S-SiQDs was higher (28.3%), while that of HPAM was only 17.2%. Thereafter, the utilization sequence of oil during the displacement process was studied with nuclear magnetic resonance experiments. Ultimately, the oil displacement mechanism of HPAM/S-SiQDs was deeply analyzed, including viscosity thickening and wetting reversal.

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“…As shown in Figure , the XRD exhibits a broad and strong peak at 2θ = 18.2°, which is the contribution of amorphous silicon. , …”

Section: Results and Discussionmentioning

confidence: 90%

Section: ■ Experimental Partmentioning

confidence: 99%

Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM

Zhao,

Li,

Dai

et al. 2024

Langmuir

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Surface Modification of p‐type ZnO Nanorods by Nitrogen Doped SiO₂ Dots as an Efficient Solar Photocatalyst for Degradation of Ciprofloxacin in Water

Cilamkoti,

Dutta

2024

Advanced Sustainable Systems

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A simple two step hydrothermal method is developed for synthesizing p‐type zinc oxide (ZnO) nanorods surface modified with nitrogen doped silicon dioxide dots (ZnO/N‐SiO2). The structure, morphology, and chemical compositions are confirmed by X‐ray diffraction, Raman spectroscopy, Fourier transformed infrared spectroscopy, X‐ray photoelectron spectroscopy, transmission electron microscopy, and by Mott‐Schottky studies. The N‐SiO2 dots on the surface of p‐type ZnO nanorods are formed during hydrothermal treatment at 90 °C (i.e., at 363 K), named as [ZnO/N‐SiO2]363K. While N‐SiO2 dots are embedded in the ZnO nanorods of the batch synthesized at 453 K. The band gap of the batches of ZnO/N‐SiO2 are wider (3.24–3.30 eV) than the pristine ZnO (3.16 eV). The modification of ZnO nanorods by the N‐SiO2 dots is corroborated by changes in the flat band potential, revealed from Mott‐Schottky measurements. The EPR and photoluminescence studies confirm p‐type ZnO attributable to zinc vacancies (VZn). The batch [ZnO/N‐SiO2]363 exhibits maximum photocatalytic degradation of ciprofloxacin in water. The specific rate constant is k′ = 0.97 min−1 g−1, which is nearly three times higher than that exhibited by the irregularly spherical pristine ZnO nanoparticles (k′ = 0.36 min−1 g−1). The enhanced photocatalytic degradation is attributed to holes mediated hydroxyl radical generation. The degradation mechanism is proposed by carrier mobility studies, radical scavenging studies and by identifying the degradation products.

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Recent Progress in Silicon Quantum Dots Sensors: A Review

Sreejith,

Ajayan,

Radhika

et al. 2024

Silicon

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Silicon dioxide quantum dots anchored on the surface of carbon nanodiscs as photoluminescent probe for Cr(VI) detection

Cited by 12 publications

References 64 publications

Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM

Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM

Surface Modification of p‐type ZnO Nanorods by Nitrogen Doped SiO₂ Dots as an Efficient Solar Photocatalyst for Degradation of Ciprofloxacin in Water

Recent Progress in Silicon Quantum Dots Sensors: A Review

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Silicon dioxide quantum dots anchored on the surface of carbon nanodiscs as photoluminescent probe for Cr(VI) detection

Cited by 12 publications

References 64 publications

Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM

Development of Novel Silicon Quantum Dots and Their Potential in Improving the Enhanced Oil Recovery of HPAM

Surface Modification of p‐type ZnO Nanorods by Nitrogen Doped SiO2 Dots as an Efficient Solar Photocatalyst for Degradation of Ciprofloxacin in Water

Recent Progress in Silicon Quantum Dots Sensors: A Review

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Product

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Surface Modification of p‐type ZnO Nanorods by Nitrogen Doped SiO₂ Dots as an Efficient Solar Photocatalyst for Degradation of Ciprofloxacin in Water