Surface structure-controlled synthesis of nanocrystals through supersaturation dependent growth strategy

Zhang, Jiawei; Chen, Qiaoli; Cao, Zhenming; Kuang, Qin; Lin, Haixin; Xie, Zhaoxiong

doi:10.1360/n032016-00208

Cited by 4 publications

(2 citation statements)

References 26 publications

(36 reference statements)

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“…When the solution concentration is higher, the faster the rate of grain generation, the generation of more and smaller grains, so the growth of grains is slow, so that it is too late to grow 27 . It makes the nano-FeS crystals with smaller particle size, which can provide larger collision area and more active sites with stronger specific surface area and activity 29 , thus effectively promoting the rapid occurrence of the reaction. In summary, the preparation of nano FeS with different Fe/S molar ratios has a great influence on the removal rate and removal rate of Cr(VI), and considering that larger Fe/S molar ratios result in the waste of resources, the reaction condition with Fe/S molar ratio of 3 was selected as the parameter for optimization experiments.…”

Section: Resultsmentioning

confidence: 99%

Reparation of nano-FeS by ultrasonic precipitation for treatment of acidic chromium-containing wastewater

Dai,

Di,

Zhang

et al. 2024

Sci Rep

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Nano-FeS is prone to agglomeration in the treatment of chromium-containing wastewater, and ultrasonic precipitation was used to synthesize nano-FeS to increase its dispersion. The optimization of the preparation method was carried out by single factor method (reaction temperature, Fe/S molar ratio and FeSO4 dropping flow rate) and response surface methodology. Dynamic experiments were constructed to investigate the long-term remediation effect and water column changes of nano-FeS and its solid particles. The changes of the remediation materials before and after the reaction were observed by SEM, and the mechanism of the remediation of chromium-containing wastewater by nano-FeS prepared by ultrasonication was revealed by XRD. The results showed that the reaction temperature of 12 °C, Fe/S molar ratio of 3.5 and FeSO4 dropping flow rate of 0.5 mL/s were the best parameters for the preparation of nano-FeS. The nano-FeS has efficient dispersion and well-defined mesoporous structure in the form of needles and whiskers of 40–80 nm. The dynamic experiments showed that the average removal of Cr(VI) and total chromium by nano-FeS and its immobilized particles were 94.97% and 63.51%, 94.93% and 45.76%, respectively. Fe2+ and S2− ionized by the FeS nanoparticles rapidly reduced Cr(VI) to Cr(III). Part of S2− may reduce Fe3+ to Fe2+, forming a small iron cycle that gradually decreases with the ion concentration. Cr(III) and Fe2+ form Cr(OH)3 and FeOOH, respectively, with the change of aqueous environment. Another part of S2− reacts with Cr(III) to form Cr2S3 precipitate or is oxidized to singlet sulfur. The FeS nanoparticles change from short rod-shaped to spherical shape. Compared with the conventional chemical precipitation method, the method used in this study is simple, low cost, small particle size and high removal rate per unit.

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Section: Resultsmentioning

confidence: 99%

Reparation of nano-FeS by ultrasonic precipitation for treatment of acidic chromium-containing wastewater

Dai,

Di,

Zhang

et al. 2024

Sci Rep

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“…However, due to the slow growth rate of nano-FeS, the resulting crystals are smaller in size and have significant specific surface energy [22] . This effectively facilitates the rapid onset of the reaction.…”

Section: Resultsmentioning

confidence: 99%

Reparation of Nano-FeS by Ultrasonic Precipitation for Treatment of Acidic Chromium-Containing Wastewater

Dai,

Di,

Zhang

et al. 2023

Preprint

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Nano-FeS is prone to agglomeration in the treatment of chromium-containing wastewater, and ultrasonic precipitation was used to synthesize nano-FeS to increase its dispersion. The optimization of the preparation method was carried out by single factor method (reaction temperature, Fe/S molar ratio and FeSO4 dropping flow rate) and response surface methodology. Dynamic experiments were constructed to investigate the long-term remediation effect and water column changes of nano-FeS and its solid particles. The changes of the remediation materials before and after the reaction were observed by SEM, and the mechanism of the remediation of chromium-containing wastewater by nano-FeS prepared by ultrasonication was revealed by XRD. The results showed that the reaction temperature of 12°C, Fe/S molar ratio of 3.5 and FeSO4 dropping flow rate of 0.5 ml·s-1 were the best parameters for the preparation of nano-FeS. The nano-FeS has efficient dispersion and well-defined mesoporous structure in the form of needles and whiskers of 40–80 nm. The dynamic experiments showed that the average removal of Cr(VI) and total chromium by nano-FeS and its immobilized particles were 94.97% and 63.51%, 94.93% and 45.76%, respectively. Fe2+ and S2- ionized by the FeS nanoparticles rapidly reduced Cr(VI) to Cr(III). Part of S2- may reduce Fe3+ to Fe2+, forming a small iron cycle that gradually decreases with the ion concentration.Cr(III) and Fe2+ form Cr(OH)3 and FeOOH, respectively, with the change of aqueous environment.Another part of S2- reacts with Cr(III) to form Cr2S3 precipitate or is oxidized to singlet sulfur.The FeS nanoparticles change from short rod-shaped to spherical shape. Compared with the conventional chemical precipitation method, the method used in this study is simple, low cost, small particle size and high removal rate per unit.

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Effects of crystal planes of ZnO nanocrystal on crystalline, thermal and thermal-oxidation stability of iPP

et al. 2021

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Surface structure-controlled synthesis of nanocrystals through supersaturation dependent growth strategy

Abstract: Facile shape and size-controlled growth of uniform magnetite and hematite nanocrystals with tunable properties SCIENCE CHINA Chemistry 54, 923 (2011); Controlled synthesis of cobalt nanocrystals on the carbon spheres for enhancing Fischer-Tropsch synthesis performance

Cited by 4 publications

References 26 publications

Reparation of nano-FeS by ultrasonic precipitation for treatment of acidic chromium-containing wastewater

Reparation of nano-FeS by ultrasonic precipitation for treatment of acidic chromium-containing wastewater

Reparation of Nano-FeS by Ultrasonic Precipitation for Treatment of Acidic Chromium-Containing Wastewater

Effects of crystal planes of ZnO nanocrystal on crystalline, thermal and thermal-oxidation stability of iPP

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