Facile one-pot preparation of cadmium sulfide quantum dots with good photocatalytic activities under stabilization of polar amino acids

Guo, Yuming; Shi, Xibao; Zhang, Jie; Fang, Qilong; Yang, Lin; Dong, Fang; Wang, Kui

doi:10.1016/j.matlet.2012.07.052

Cited by 16 publications

(8 citation statements)

References 14 publications

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“…) showed percentage reduction of TiO 2 –yeast over five cycles was 99%, 96%, 93%, 90%, and 88%, respectively, indicating that the photocatalytic activities of the TiO 2 –yeast showed little loss after five cycles of the photocatalytic reaction. Importantly, our TiO 2 –yeast composites showed excellent recycling stability compared with others reported in the literature . The possible reason is the better affinity between yeast and TiO 2 .…”

Section: Resultsmentioning

confidence: 52%

“…Importantly, our TiO 2 -yeast composites showed excellent recycling stability compared with others reported in the literature. 43 The possible reason is the better affinity between yeast and TiO 2 . Our results suggest that the TiO 2 -yeast can be reused many times to degrade metal ions pollutants, which is necessary for practical and long-term applications.…”

Section: Catalytic Performancementioning

confidence: 99%

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Hydrothermal synthesis of TiO₂–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Song

Bai

Jing

2014

J of Chemical Tech & Biotech

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BACKGROUND Nanoparticle TiO2 and biological yeast cells have been investigated in previous work. However, the formation of TiO2–yeast hybrid materials with controllable structures is rarely reported. In the present study, the hydrolysis of titanium tetrabutoxide (TBOB) on the surface of yeast cells was proposed to prepare controllable structures of TiO2–yeast hybrid microspheres. It also develops and widens the applications of TiO2–yeast hybrid microspheres for removal of Cr(VI). RESULTS FE‐SEM and EDS revealed that the TiO2–yeast hybrid microspheres have rough surface morphology and uniform diameter. The XRD pattern indicated anatase phase TiO2 nanoparticles with amorphous yeast. FT‐IR spectroscopy demonstrated that the formation of controllable TiO2–yeast composite microspheres was related to surface chemical functional groups of yeast. The composite microspheres possessed enhanced light response over the wide range 250–435 nm. The photocatalytic performance of TiO2–yeast (1.3 mL TBOB) composite microspheres exhibited a maximum removal rate of 99% for the reduction of Cr(VI) under UV light irradiation. CONCLUSIONS TiO2–yeast hybrid microspheres with controllable structures were successfully synthesized via a hydrothermal method. The diameter of TiO2–yeast microspheres decreased with increase of the amount of TBOB. No significant decrease in photo‐activity was found when used for the reduction of Cr(VI) and the composites could be re‐used repeatedly without other treatment. © 2014 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 52%

Section: Catalytic Performancementioning

confidence: 99%

Hydrothermal synthesis of TiO₂–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Song

Bai

Jing

2014

J of Chemical Tech & Biotech

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“…Indeed, a range of different amino acids have previously been shown to serve as capping ligands for CdS, including Arg, Met, Val, Glu, Asp, Gly, His, Pro, Ser, and Trp. [28][29][30] Thus, while the chemical mode by which the four selected additives serve as binding ligands is well established, [ 26 ] the possibility that they could act in concert to control CdS superstructure formation would have been diffi cult to predict a priori, without the use of genetic algorithm-based optimization and rapid reaction screening.…”

Section: Doi: 101002/adma201403185mentioning

confidence: 99%

Genetic Algorithm‐Guided Discovery of Additive Combinations That Direct Quantum Dot Assembly

et al. 2014

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these techniques are limited by the requirement for complex enzymatic reactions. As an alternative strategy that bypasses the need for genetic engineering, combinatorial methods can be employed. These can be used to explore tens to hundreds of reaction conditions, where the most promising or "lead" conditions may be selected based on the structures or properties of the resultant material. [ 17,18 ] Lead conditions can then be used to narrow the reaction landscape in successive screening rounds. Surprisingly, although combinatorial methods are often used in solid-state chemistry to explore, for example, different reagent compositions, [ 18 ] we are not aware of their use in identifying soluble additives capable of directing mineralization.In this article we demonstrate how combinatorial methods can be used in conjunction with effi cient screening processes to rapidly identify combinations of small organic molecules that are capable of directing the formation of photoluminescent quantum dot minerals in aqueous solution and at room temperature. Indeed, a key feature of biomineralization processes is that control over mineral formation is achieved using many soluble additives that operate in concert. That this feature has seldom been addressed in bioinspired methods is almost certainly due to the vast number of potential variables, which renders a full, systematic exploration intractable. As a solution to this challenge, we here utilize a genetic algorithm as a bioinspired heuristic that mimics natural evolution. Genetic algorithms use selection, recombination, and mutation strategies to rapidly identify and optimize the combination of conditions (here, soluble additives), which gives rise to materials with target properties. [ 19 ] Using a pipetting robot to prepare reaction sets and a UV-light table to rapidly assess the reactions for the formation of photoluminescent minerals, we are able to rapidly identify the key additives that promote the formation of quantum dot superstructures from one-pot aqueous reactions.Our initial library of organic mediators included 23 components, of which 17 were amino acids and 6 were surfactants. Stock solutions of the amino acids were prepared to initial concentrations of 100 × 10 −3 M , and explored at concentrations ranging from 0.01 to 50 × 10 −3 M , while surfactants were prepared to near their solubility limits in water. Surfactants were included as potential structure-directing agents to drive hierarchical assembly in aqueous solution. The overall screening approach used to identify the key additive set is summarized in Figure 1 . First, library amino acids and surfactants were randomly mixed in 48 wells of a multi-well plate, such that each well contained between 1-6 amino acids and 1-3 surfactants (Figure 1 A). Cadmium chloride and thioacetic acid (as a sulfur source) [ 20 ] were then added to a concentration of 1 × 10 −3 M in all wells, as precursors for CdS. After 3 d the plate was viewed under UV illumination (Figure 1 A) and with a fl uorimetric Biomineralization, whi...

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“…[14][15][16][17] Recently, quantum dots of CdS and CdSe have been used in processes of photo-catalysis to degrade cationic and anionic organic dyes; however their potential toxicity prevents the widespread use of these nanomaterials in water treatment schemes. [18][19][20][21][22][23] Indeed, Cd-free quantum dots like non-doped ZnSe(S) alloyed QDs and doped with copper show promising properties to be used as nanophoto-catalyst for organic dyes degradation. Although, the doping with copper does not change the absorption spectrum (or band gap energy) of the nondoped ZnSe(S) alloyed QDs, previous studies suggest that the presence of copper enhance the half-lifetime of the charge carriers (electrons/holes) which are responsible of the photocatalysis efficiency.…”

Section: Introductionmentioning

confidence: 99%

Quantum Dots of ZnSe(S) Doped with Copper as Nanophotocatalyst in the Degradation of Organic Dyes

Alamo-Nole¹,

Bailón-Ruiz²,

Cruz‐Acuña³

et al. 2014

j nanosci nanotechnol

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Copper-doped quantum dots of ZnSe(S) synthesized via microwave-heating conditions were used as photocatalyst in the photo-degradation of methylene blue (MB), methyl violet (MV) and victoria blue (VB) under UV irradiation (302 nm) in aqueous phase and at pH 6.5. Quantum dots were characterized by High Resolution Transmission Electron Microscopy (HR-TEM), X-ray diffraction (XRD), UV-Vis, photoluminescence and Fourier transform infrared (FT-IR) spectroscopy. The degradation of MB, MV and VB were monitored using High Performance Liquid Chromatography (HPLC) at 660 nm, 590 nm and 610 nm, respectively. Degradations percentages of 46%, 88% and 90% of MB, MV and VB, respectively, were achieved in presence of 1000 mg/L of quantum dots and 6 hours of UV-irradiation. Cu-doped ZnSe(S) QDs evidenced a remarkable capability to degrade cationic organic dyes as single components and in mixtures.

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Facile one-pot preparation of cadmium sulfide quantum dots with good photocatalytic activities under stabilization of polar amino acids

Cited by 16 publications

References 14 publications

Hydrothermal synthesis of TiO₂–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Hydrothermal synthesis of TiO₂–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Genetic Algorithm‐Guided Discovery of Additive Combinations That Direct Quantum Dot Assembly

Quantum Dots of ZnSe(S) Doped with Copper as Nanophotocatalyst in the Degradation of Organic Dyes

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Facile one-pot preparation of cadmium sulfide quantum dots with good photocatalytic activities under stabilization of polar amino acids

Cited by 16 publications

References 14 publications

Hydrothermal synthesis of TiO2–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Hydrothermal synthesis of TiO2–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Genetic Algorithm‐Guided Discovery of Additive Combinations That Direct Quantum Dot Assembly

Quantum Dots of ZnSe(S) Doped with Copper as Nanophotocatalyst in the Degradation of Organic Dyes

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Hydrothermal synthesis of TiO₂–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)

Hydrothermal synthesis of TiO₂–yeast hybrid microspheres with controllable structures and their application for the photocatalytic reduction of Cr (VI)