Facile and economical synthesis of ZnS nanotubes and their superior adsorption performance for organic dyes

Guo, Meizhen; Song, Mingming; Li, Shanshan; Yin, Zhang; Song, Xinyu; Bu, Yuxiang

doi:10.1039/c7ce00360a

Cited by 39 publications

(14 citation statements)

References 92 publications

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“…The band gap, phase, and morphology of this material can be tuned synthetically by decreasing the size to nano regime as per need that is suitable for the removal of organic dyes via visible-light photocatalysis and adsorption. 63,64 In this study, we developed a low-temperature wet-chemical green route for the synthesis of cobalt sulfide NS with different phase and morphology (Scheme 1) and subsequently used it for photocatalysis and adsorption studies.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, it is low-cost material and has different stoichiometric and nonstoichiometric phases of cobalt sulfides such as Co 4 S 3 , Co 9 S 8 , CoS, Co 3 S 4 , Co 2 S 3 , Co 1– x S, and CoS 2 . − Therefore, we chose cobalt sulfide as the material of choice for photocatalytic and adsorption studies. The band gap, phase, and morphology of this material can be tuned synthetically by decreasing the size to nano regime as per need that is suitable for the removal of organic dyes via visible-light photocatalysis and adsorption. , In this study, we developed a low-temperature wet-chemical green route for the synthesis of cobalt sulfide NS with different phase and morphology (Scheme ) and subsequently used it for photocatalysis and adsorption studies.…”

Section: Introductionmentioning

confidence: 99%

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Phase Tuned Originated Dual Properties of Cobalt Sulfide Nanostructures as Photocatalyst and Adsorbent for Removal of Dye Pollutants

Khan

Kumari

Chowdhury

et al. 2018

ACS Appl. Nano Mater.

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Synthesis of cobalt sulfide nanostructures (NS) with tunable phases was achieved by changing the reaction temperature through facile precipitation method. Prepared NS were fully characterized by powder Xray diffraction, UV−vis spectroscopy, diffuse reflectance spectroscopy, Xray photoelectron spectroscopy, field emission scanning electron microscopy, high-resolution transmission electron microscopy, energydispersive X-ray spectroscopy, selected area electron diffraction, thermogravimetric analysis, and Brunauer−Emmett−Teller analysis. The NS synthesized at 90 °C (CoS) have photocatalytic property, while at 70 °C (Co 4 S 3 ) they were found to have adsorption activity. This change of property with the tuning of the phases of cobalt sulfide was observed for the first time to our knowledge. On the one hand, organic dyes such as rhodamine B (RhB), methylene blue (MB), crystal violet, and nile blue were subjected to photocatalysis under visible light irradiation at pH 6.8 and were found to degrade organic dyes rapidly and efficiently with only 2% loss of activity after the seventh cycle of reaction. On the other hand, the adsorbent has shown extremely high adsorption efficiency with maximum adsorption capacity for Congo red (3270 mg/g), RhB (1138 mg/g), and MB (629 mg/g). The adsorption process followed the pseudo-second-order rate kinetics and Langmuir adsorption isotherm model. The reusability of adsorbent was found up to eighth cycle without significant loss of activity.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Tuned Originated Dual Properties of Cobalt Sulfide Nanostructures as Photocatalyst and Adsorbent for Removal of Dye Pollutants

Khan

Kumari

Chowdhury

et al. 2018

ACS Appl. Nano Mater.

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“…The photoluminescence spectra of the as-prepared ZnS quantum dots show defective state emission bands that promote lifetime separation of (e − -h + ) pairs, which could enhance the photocatalytic degradation process. In order to establish which reactive species, influence the photodegradation process, isopropyl alcohol (IPA), silver nitrate (SN), and acrylamide (AC) were used as scavengers to quench •OH − , e − , and 22,55,56]. A comparison between the photodegradation of brilliant green, rhodamine B, and the binary-dye solution after the addition of scavengers (Figure 7) indicates that brilliant green dye degradation efficiency by ZnS-1 decreases from 71.62% (no scavenger) to 36.30% (SN), 61.99% (AC), and 67.65% (IPA) while its degradation by ZnS-2 decreases from 91.06 to 32.72%, 79.26%, and 81.46%, and with ZnS-3 it decreases from 94.61% to 50.28%, 84.37%, and 88.59%, respectively.…”

Section: Effect Of Irradiation Time On Photocatalytic Degradationmentioning

confidence: 99%

Photocatalytic Degradation of Single and Binary Mixture of Brilliant Green and Rhodamine B Dyes by Zinc Sulfide Quantum Dots

Ajibade

Oluwalana

2021

Molecules

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We present the preparation of octadecylamine-capped ZnS quantum dots from bis(morpholinyldithiocarbamato)Zn(II) complex. The complex was thermolyzed at 130 °C in octadecylamine at different times, to study the effect of reaction time on the morphological and photocatalytic properties of the ZnS quantum dots. Powder X-ray diffraction patterns confirmed a hexagonal wurtzite crystalline phase of ZnS, while HRTEM images showed particle sizes of about 1–3 nm, and energy band gaps of 3.68 eV (ZnS–1), 3.87 eV (ZnS–2), and 4.16 eV (ZnS–3) were obtained from the Tauc plot for the ZnS nanoparticles. The as-prepared ZnS were used as photocatalysts for the degradation of brilliant green, rhodamine B, and binary dye consisting of a mixture of brilliant green-rhodamine B. The highest photocatalytic degradation efficiency of 94% was obtained from ZnS–3 with low photoluminescence intensity. The effect of catalytic dosage and pH of the dyes solution on the photocatalytic process shows that pH 8 is optimal for the degradation of brilliant green, while pH 6.5 is the best for photocatalytic degradation of rhodamine B. The degradation of the binary dyes followed the same trends. The effect of catalytic dosage shows that 1 mg mL−1 of the ZnS nano-photocatalyst is the optimum dosage for the degradation of organic dyes. Reusability studies show that the ZnS quantum dots can be reused five times without a significant reduction in degradation efficiency.

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“…Accordingly, a large number of experiments were performed and nanotubes of several binary compounds, such as BN, SiC, ZnO, ZnS, CdSe, CdS, GaN, and HgSe were successfully synthesized. [2][3][4][5][6][7][8][9] Among noncarbon materials, ZnTe, a group II-VI semiconductor, exhibits some remarkable features such as relatively small resistance, bandgap of 2.2-2.3 eV and a very high photoabsorption coefficient of %3 Â 10 4 cm À1 under 540 nm. [10][11][12][13] Because of these intriguing features, ZnTe nanostructures were shown to be useful in solar cells, green LEDs, photovoltaic devices, thermoelectric devices, and photodetectors.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atomic‐Ordering‐Induced Modulated Properties of Zigzag ZnTe Nanotubes

Das¹,

Chowdhury

Gupta

2021

Physica Status Solidi (b)

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In this work, zigzag ZnTe nanotubes of various diameters are constructed from a ZnTe sheet and are optimized geometrically through density functional theory based energy minimization calculations. The energetically optimized nanotubes are then used to examine their electronic properties. It is found that the band gap of a nanotube may be adjusted over a wide range from 0.5 to 2.3 eV and the work function of a nanotube may be adjusted in the range from 4.7 to 5.8 eV by choosing a nanotube of appropriate diameter. Thus, zigzag ZnTe nanotube may serve as an important band gap material for technological purposes.

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Facile and economical synthesis of ZnS nanotubes and their superior adsorption performance for organic dyes

Cited by 39 publications

References 92 publications

Phase Tuned Originated Dual Properties of Cobalt Sulfide Nanostructures as Photocatalyst and Adsorbent for Removal of Dye Pollutants

Phase Tuned Originated Dual Properties of Cobalt Sulfide Nanostructures as Photocatalyst and Adsorbent for Removal of Dye Pollutants

Photocatalytic Degradation of Single and Binary Mixture of Brilliant Green and Rhodamine B Dyes by Zinc Sulfide Quantum Dots

Atomic‐Ordering‐Induced Modulated Properties of Zigzag ZnTe Nanotubes

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